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SS pipe grades.

A249/ A249M A269 A270 A778 A335/ A335M A691
A790 A312 A409 A554 A358/ A358M A928/ A928M


CS pipe Grades

A 106 A53 API5L A671 A672

A 106 Chemical Properties :

  Grade A Grade B Grade C
Carbon, max 0.25 0.30 0.35
Manganese 0.27-0.93 0.29-1.06 0.29-1.06
Phosphorus, max 0.035 0.035 0.035
Sulphur, max 0.035 0.035 0.035
Silicon, min 0.10 0.10 0.10
Chrome, max 0.40 0.40 0.40
Copper, max 0.40 0.40 0.40
Molybdenum, max 0.15 0.15 0.15
Nickel, max 0.40 0.40 0.40
Vanadium, max 0.08 0.08 0.08

A 106 Mechanical Properties :

  Grade A Grade B Grade C
Tensile Strength, min: 48,000 psi [330 MPa] 60,000 psi [415 MPa] 70,000 psi [485 MPa]
Yield Strength, min: 30,000psi [205 MPa] 35,000psi [240 MPa] 40,000psi [275 MPa]

 

Designation: A 106/A 106M – 06a

Standard Specification for
Seamless Carbon Steel Pipe for High-Temperature Service

This standard is issued under the fixed designation A 106/A 106M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.

1. Scope*
1.1 This specification2 covers seamless carbon steel pipe for
high-temperature service (Note 1) in NPS 1⁄8 to NPS 48 [DN 6
to DN 1200] (Note 2) inclusive, with nominal (average) wall
thickness as given in ASME B 36.10M. It shall be permissible
to furnish pipe having other dimensions provided such pipe
complies with all other requirements of this specification. Pipe
ordered under this specification shall be suitable for bending,
flanging, and similar forming operations, and for welding.
When the steel is to be welded, it is presupposed that a welding
procedure suitable to the grade of steel and intended use or
service will be utilized.
NOTE 1—It is suggested, consideration be given to possible graphitization.
NOTE 2—The dimensionless designator NPS (nominal pipe size) [DN
(diameter nominal)] has been substituted in this standard for such
traditional terms as “nominal diameter,” “size,” and “nominal size.”
1.2 Supplementary requirements of an optional nature are
provided for seamless pipe intended for use in applications
where a superior grade of pipe is required. These supplementary
requirements call for additional tests to be made and when
desired shall be so stated in the order.
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents. Therefore, each
system is to be used independently of the other.
1.4 The following precautionary caveat pertains only to the
test method portion, Sections 11, 12, and 13 of this specification:
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards: 3
A 530/A 530M Specification for General Requirements for
Specialized Carbon and Alloy Steel Pipe
E 213 Practice for Ultrasonic Examination of Metal Pipe
and Tubing
E 309 Practice for Eddy-Current Examination of Steel Tubular
Products Using Magnetic Saturation
E 381 Method of Macroetch Testing Steel Bars, Billets,
Blooms, and Forgings
E 570 Practice for Flux Leakage Examination of Ferromagnetic
Steel Tubular Products
2.2 ASME Standard:
ASME B 36.10M Welded and Seamless Wrought Steel
Pipe4
2.3 Military Standards:
MIL-STD-129 Marking for Shipment and Storage5
MIL-STD-163 Steel Mill Products, Preparation for Shipment
and Storage5
2.4 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)5
Fed. Std. No. 183 Continuous Identification Marking of Iron
and Steel Products5
2.5 Other Standards:
SSPC-SP 6 Surface Preparation Specification No. 66
3. Ordering Information
3.1 The inclusion of the following, as required will describe
the desired material adequately, when ordered under this
specification:
3.1.1 Quantity (feet, metres, or number of lengths),
1 This specification is under the jurisdiction of Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.09 on Carbon Steel Tubular Products.
Current edition approved Oct. 1, 2006. Published October 2006. Originally
approved in 1926. Last previous edition in 2006 as A 106/A 106M – 06.
2 For ASME Boiler and Pressure Vessel Code applications see related Specifications
SA-106 in Section II of that Code.
3 For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
4 Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Three Park Ave., New York, NY 10016-5990.
5 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.
6 Available from Steel Structures Painting Council (SSPC), 40 24th St., 6th
Floor, Pittsburgh, PA 15222-4656.

3.1.2 Name of material (seamless carbon steel pipe),
3.1.3 Grade (Table 1),
3.1.4 Manufacture (hot-finished or cold-drawn),
3.1.5 Size (NPS [DN] and weight class or schedule number,
or both; outside diameter and nominal wall thickness; or inside
diameter and nominal wall thickness),
3.1.6 Special outside diameter tolerance pipe (16.2.2),
3.1.7 Inside diameter tolerance pipe, over 10 in. [250 mm]
ID (16.2.3),
3.1.8 Length (specific or random, Section 17),
3.1.9 Optional requirements (Section 9 and S1 to S8),
3.1.10 Test report required (Section on Certification of
Specification A 530/A 530M),
3.1.11 Specification designation (A 106 or A 106M, including
year-date),
3.1.12 End use of material,
3.1.13 Hydrostatic test in accordance with Specification
A 530/A 530M or 13.3 of this specification, or NDE in
accordance with Section 14 of this specification.
3.1.14 Special requirements.
4. Process
4.1 The steel shall be killed steel, with the primary melting
process being open-hearth, basic-oxygen, or electric-furnace,
possibly combined with separate degassing or refining. If
secondary melting, using electroslag remelting or vacuum-arc
remelting is subsequently employed, the heat shall be defined
as all of the ingots remelted from a single primary heat.
4.2 Steel cast in ingots or strand cast is permissible. When
steels of different grades are sequentially strand cast, identification
of the resultant transition material is required. The
producer shall remove the transition material by any established
procedure that positively separates the grades.
4.3 For pipe NPS 11⁄2 [DN 40] and under, it shall be
permissible to furnish hot finished or cold drawn.
4.4 Unless otherwise specified, pipe NPS 2 [DN 50] and
over shall be furnished hot finished. When agreed upon
between the manufacturer and the purchaser, it is permissible
to furnish cold-drawn pipe.
5. Heat Treatment
5.1 Hot-finished pipe need not be heat treated. Cold-drawn
pipe shall be heat treated after the final cold draw pass at a
temperature of 1200 °F (650 °C) or higher.

TABLE 1   Chemical Requirements

 

 

Composition, %

 

Grade A

Grade B

Grade C

Carbon, maxA

0.25

0.30

0.35

Manganese

0.27–0.93

0.29–1.06

0.29–1.06

Phosphorus, max

0.035

0.035

0.035

Sulfur, max

0.035

0.035

0.035

Silicon, min

0.10

0.10

0.10

Chrome, maxB

0.40

0.40

0.40

Copper, maxB

0.40

0.40

0.40

Molybdenum, maxB

0.15

0.15

0.15

Nickel, maxB

0.40

0.40

0.40

Vanadium, maxB

0.08

0.08

0.08

A  For  each reduction of  0.01 %  below the  specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted up to a maximum of 1.35 %.
B  These five elements combined shall not exceed 1 %.

6. General Requirements
6.1 Material furnished to this specification shall conform to
the applicable requirements of the current edition of Specification
A 530/A 530M unless otherwise provided herein.
7. Chemical Composition
7.1 The steel shall conform to the requirements as to
chemical composition prescribed in Table 1.
8. Heat Analysis
8.1 An analysis of each heat of steel shall be made by the
steel manufacturer to determine the percentages of the elements
specified in Section 7. If the secondary melting processes
of 5.1 are employed, the heat analysis shall be obtained
from one remelted ingot or the product of one remelted ingot
of each primary melt. The chemical composition thus determined,
or that determined from a product analysis made by the
manufacturer, if the latter has not manufactured the steel, shall
be reported to the purchaser or the purchaser’s representative,
and shall conform to the requirements specified in Section 7.
9. Product Analysis
9.1 At the request of the purchaser, analyses of two pipes
from each lot (see 20.1) shall be made by the manufacturer
from the finished pipe. The results of these analyses shall be
reported to the purchaser or the purchaser’s representative and
shall conform to the requirements specified in Section 7.
9.2 If the analysis of one of the tests specified in 9.1 does
not conform to the requirements specified in Section 7,
analyses shall be made on additional pipes of double the
original number from the same lot, each of which shall
conform to requirements specified.
10. Tensile Requirements
10.1 The material shall conform to the requirements as to
tensile properties given in Table 2.
11. Bending Requirements
11.1 For pipe NPS 2 [DN 50] and under, a sufficient length
of pipe shall stand being bent cold through 90° around a
cylindrical mandrel, the diameter of which is twelve times the
outside diameter (as shown in ASME B 36.10M) of the pipe,
without developing cracks. When ordered for close coiling, the
pipe shall stand being bent cold through 180° around a
cylindrical mandrel, the diameter of which is eight times the
outside diameter (as shown in ASME B 36.10M) of the pipe,
without failure.
11.2 For pipe whose diameter exceeds 25 in. [635 mm] and
whose diameter to wall thickness ratio, where the diameter to
wall thickness ratio is the specified outside diameter divided by
the nominal wall thickness, is 7.0 or less, the bend test shall be
conducted. The bend test specimens shall be bent at room
temperature through 180° with the inside diameter of the bend
being 1in. [25 mm] without cracking on the outside portion of
the bent portion.
Example: For 28 in. [711 mm] diameter 5.000 in. [127 mm]
thick pipe the diameter to wall thickness ratio = 28/5 = 5.6
[711/127 = 5.6].

12. Flattening Tests
12.1 Although testing is not required, pipe shall be capable
of meeting the flattening test requirements of Supplementary
Requirement S3, if tested.
13. Hydrostatic Test
13.1 Except as allowed by 13.2, 13.3, and 13.4, each length
of pipe shall be subjected to the hydrostatic test without
leakage through the pipe wall.
13.2 As an alternative to the hydrostatic test at the option of
the manufacturer or where specified in the purchase order, it
shall be permissible for the full body of each pipe to be tested
with a nondestructive electric test described in Section 14.
13.3 Where specified in the purchase order, it shall be
permissible for pipe to be furnished without the hydrostatic test
and without the nondestructive electric test in Section 14; in
this case, each length so furnished shall include the mandatory
marking of the letters “NH.” It shall be permissible for pipe
meeting the requirements of 13.1 or 13.2 to be furnished where
pipe without either the hydrostatic or nondestructive electric
test has been specified in the purchase order; in this case, such
pipe need not be marked with the letters “NH.” Pipe that has
failed either the hydrostatic test of 13.1 or the nondestructive
electric test of 13.2 shall not be furnished as “NH” pipe.
13.4 Where the hydrostatic test and the nondestructive
electric test are omitted and the lengths marked with the letters
“NH,” the certification, where required, shall clearly state “Not
Hydrostatically Tested,” and the letters “NH” shall be appended
to the product specification number and material grade
shown on the certification.
14. Nondestructive Electric Test
14.1 As an alternative to the hydrostatic test at the option of
the manufacturer or where specified in the purchase order as an
alternative or addition to the hydrostatic test, the full body of
each pipe shall be tested with a nondestructive electric test in
accordance with Practice E 213, E 309, or E 570. In such cases,
the marking of each length of pipe so furnished shall include
the letters “NDE.” It is the intent of this nondestructive electric
test to reject pipe with imperfections that produce test signals
equal to or greater than that produced by the applicable
calibration standard.
14.2 Where the nondestructive electric test is performed, the
lengths shall be marked with the letters “NDE.” The certification,
where required, shall state “Nondestructive Electric
Tested” and shall indicate which of the tests was applied. Also,
the letters “NDE” shall be appended to the product specification
number and material grade shown on the certification.
14.3 The following information is for the benefit of the user
of this specification:
14.3.1 The reference standards defined in 14.4 through 14.6
are convenient standards for calibration of nondestructive
testing equipment. The dimensions of such standards are not to
be construed as the minimum sizes of imperfections detectable
by such equipment.
14.3.2 The ultrasonic testing referred to in this specification
is capable of detecting the presence and location of significant
longitudinally or circumferentially oriented imperfections:
however, different techniques need to be employed for the
detection of such differently oriented imperfections. Ultrasonic
testing is not necessarily capable of detecting short, deep
imperfections.

14.3.3 The eddy current examination referenced in this
specification has the capability of detecting significant imperfections,
especially of the short abrupt type.
14.3.4 The flux leakage examination referred to in this
specification is capable of detecting the presence and location
of significant longitudinally or transversely oriented imperfections:
however, different techniques need to be employed for
the detection of such differently oriented imperfections.
14.3.5 The hydrostatic test referred to in Section 13 has the
capability of finding defects of a size permitting the test fluid
to leak through the tube wall and may be either visually seen
or detected by a loss of pressure. Hydrostatic testing is not
necessarily capable of detecting very tight, through-the-wall
imperfections or imperfections that extend an appreciable
distance into the wall without complete penetration.
14.3.6 A purchaser interested in ascertaining the nature
(type, size, location, and orientation) of discontinuities that can
be detected in the specific applications of these examinations is
directed to discuss this with the manufacturer of the tubular
product.
14.4 For ultrasonic testing, the calibration reference notches
shall be, at the option of the producer, any one of the three
common notch shapes shown in Practice E 213. The depth of
notch shall not exceed 121⁄2 % of the specified wall thickness
of the pipe or 0.004 in. [0.1 mm], whichever is greater.
14.5 For eddy current testing, the calibration pipe shall
contain, at the option of the producer, any one of the following
discontinuities to establish a minimum sensitivity level for
rejection:
14.5.1 Drilled Hole—The calibration pipe shall contain
depending upon the pipe diameter three holes spaced 120°
apart or four holes spaced 90° apart and sufficiently separated
longitudinally to ensure separately distinguishable responses.
The holes shall be drilled radially and completely through the
pipe wall, care being taken to avoid distortion of the pipe while
drilling. Depending upon the pipe diameter the calibration pipe
shall contain the following hole:

14.5.2 Transverse Tangential Notch—Using a round tool or
file with a 1⁄4-in. [6-mm] diameter, a notch shall be filed or
milled tangential to the surface and transverse to the longitudinal
axis of the pipe. The notch shall have a depth not
exceeding 12 1⁄2 % of the specified wall thickness of the pipe
or 0.004 in. [0.1 mm], whichever is greater.
14.5.3 Longitudinal Notch—A notch 0.031 in. [0.8 mm] or
less in width shall be machined in a radial plane parallel to the
tube axis on the outside surface of the pipe, to have a depth not
exceeding 12 1⁄2 % of the specified wall thickness of the tube
or 0.004 in. [0.1 mm], whichever is greater. The length of the
notch shall be compatible with the testing method.
14.5.4 Compatibility—The discontinuity in the calibration
pipe shall be compatible with the testing equipment and the
method being used.
14.6 For flux leakage testing, the longitudinal calibration
reference notches shall be straight-sided notches machined in a
radial plane parallel to the pipe axis. For wall thicknesses under
1⁄2 in. [12.7 mm], outside and inside notches shall be used; for
wall thicknesses equal to and above 1⁄2 in. [12.7 mm], only an
outside notch shall be used. Notch depth shall not exceed 121⁄2
% of the specified wall thickness, or 0.004 in. [0.1 mm],
whichever is greater. Notch length shall not exceed 1 in. [25
mm], and the width shall not exceed the depth. Outside
diameter and inside diameter notches shall be located sufficiently
apart to allow separation and identification of the
signals.
14.7 Pipe containing one or more imperfections that produce
a signal equal to or greater than the signal produced by the

calibration standard shall be rejected or the area producing the
signal shall be reexamined.
14.7.1 Test signals produced by imperfections which cannot
be identified, or produced by cracks or crack-like imperfections
shall result in rejection of the pipe, unless it is repaired and
retested. To be accepted, the pipe must pass the same specification
test to which it was originally subjected, provided that
the remaining wall thickness is not decreased below that
permitted by this specification. The OD at the point of grinding
may be reduced by the amount so reduced.
14.7.2 Test signals produced by visual imperfections such as
those listed below may be evaluated in accordance with the
provisions of Section 18:
14.7.2.1 Dinges,
14.7.2.2 Straightener marks,
14.7.2.3 Cutting chips,
14.7.2.4 Scratches,
14.7.2.5 Steel die stamps,
14.7.2.6 Stop marks, or
14.7.2.7 Pipe reducer ripple.
14.8 The test methods described in this section are not
necessarily capable of inspecting the end portion of pipes, a
condition referred to as “end effect.” The length of such end
effect shall be determined by the manufacturer and, when
specified in the purchase order, reported to the purchaser.
15. Nipples
15.1 Nipples shall be cut from pipe of the same dimensions
and quality described in this specification.
16. Dimensions, Mass, and Permissible Variations
16.1 Mass—The mass of any length of pipe shall not vary
more than 10 % over and 3.5 % under that specified. Unless
otherwise agreed upon between the manufacturer and the
purchaser, pipe in NPS 4 [DN 100] and smaller may be
weighed in convenient lots; pipe larger than NPS 4 [DN 100]
shall be weighed separately.
16.2 Diameter—The tolerances for diameter shall be in
accordance with the following:
16.2.1 Except for pipe ordered as special outside diameter
tolerance pipe or as inside diameter tolerance pipe, variations
in outside diameter shall not exceed those given in Table 3.
16.2.2 For pipe over 10 in. [250 mm] OD ordered as special
outside diameter tolerance pipe, the outside diameter shall not
vary more than 1 % over or 1 % under the specified outside
diameter.
16.2.3 For pipe over 10 in. [250 mm] ID ordered as inside
diameter tolerance pipe, the inside diameter shall not vary
more than 1 % over or 1 % under the specified inside diameter.
16.3 Thickness—The minimum wall thickness at any point
shall not be more than 12.5 % under the specified wall
thickness.
17. Lengths
17.1 Pipe lengths shall be in accordance with the following
regular practice:
17.1.1 The lengths required shall be specified in the order,
and

TABLE 3   Variations in Outside Diameter
Permissible Variations in
Outside Diameter

NPS [DN Designator]

Over                                     Under

 

in.

mm

in.

mm

1⁄8    to 11⁄2  [6 to 40],

1⁄64   (0.015)

0.4

1⁄64   (0.015)

0.4

incl

 

 

 

 

Over 11⁄2  to 4 [40 to

1⁄32   (0.031)

0.8

1⁄32   (0.031)

0.8

100], incl

 

 

 

 

Over 4 to 8 [100 to

1⁄16   (0.062)

1.6

1⁄32   (0.031)

0.8

200], incl

 

 

 

 

Over 8 to 18 [200 to

3⁄32   (0.093)

2.4

1⁄32   (0.031)

0.8

450], incl

 

 

 

 

Over 18 to 26 [450 to

1⁄8    (0.125)

3.2

1⁄32   (0.031)

0.8

650], incl

 

 

 

 

Over 26 to 34 [650 to

5⁄32   (0.156)

4.0

1⁄32   (0.031)

0.8

850], incl

 

 

 

 

Over 34 to 48 [850 to

3⁄16   (0.187)

4.8

1⁄32   (0.031)

0.8

1200], incl

 

 

 

 

17.1.2 No jointers are permitted unless otherwise specified.
17.1.3 If definite lengths are not required, pipe may be
ordered in single random lengths of 16 to 22 ft [4.8 to 6.7 m]
with 5 % 12 to 16 ft [3.7 to 4.8 m], or in double random lengths
with a minimum average of 35 ft [10.7 m] and a minimum
length of 22 ft [6.7 m] with 5 % 16 to 22 ft [4.8 to 6.7 m].
18. Workmanship, Finish and Appearance
18.1 The pipe manufacturer shall explore a sufficient number
of visual surface imperfections to provide reasonable
assurance that they have been properly evaluated with respect
to depth. Exploration of all surface imperfections is not
required but consideration should be given to the necessity of
exploring all surface imperfections to assure compliance with
18.2.
18.2 Surface imperfections that penetrate more than 121⁄2 %
of the nominal wall thickness or encroach on the minimum
wall thickness shall be considered defects. Pipe with such
defects shall be given one of the following dispositions:
18.2.1 The defect shall be removed by grinding, provided
that the remaining wall thickness is within the limits specified
in 16.3.
18.2.2 Repaired in accordance with the repair welding
provisions of 18.6.
18.2.3 The section of pipe containing the defect may be cut
off within the limits of requirements on length.
18.2.4 Rejected.
18.3 To provide a workmanlike finish and basis for evaluating
conformance with 18.2 the pipe manufacturer shall
remove by grinding the following noninjurious imperfections:
18.3.1 Mechanical marks and abrasions—such as cable
marks, dinges, guide marks, roll marks, ball scratches, scores,
and die marks—and pits, any of which imperfections are
deeper than 1⁄16 in. [1.6 mm].
18.3.2 Visual imperfections commonly referred to as scabs,
seams, laps, tears, or slivers found by exploration in accordance
with 18.1 to be deeper than 5 % of the nominal wall
thickness.
18.4 At the purchaser’s discretion, pipe shall be subjected to
rejection if surface imperfections acceptable under 18.2 are not
scattered, but appear over a large area in excess of what is

considered a workmanlike finish. Disposition of such pipe shall
be a matter of agreement between the manufacturer and the
purchaser.
18.5 When imperfections or defects are removed by grinding,
a smooth curved surface shall be maintained, and the wall
thickness shall not be decreased below that permitted by this
specification. The outside diameter at the point of grinding is
permitted to be reduced by the amount so removed.
18.5.1 Wall thickness measurements shall be made with a
mechanical caliper or with a properly calibrated nondestructive
testing device of appropriate accuracy. In case of dispute, the
measurement determined by use of the mechanical caliper shall
govern.
18.6 Weld repair shall be permitted only subject to the
approval of the purchaser and in accordance with Specification
A 530/A 530M.
18.7 The finished pipe shall be reasonably straight.
19. End Finish
19.1 The Pipe shall be furnished to the following practice,
unless otherwise specified.
19.1.1 NPS 11⁄2 [DN 40] and Smaller—All walls shall be
either plain-end square cut, or plain-end beveled at the option
of the manufacturer.
19.1.2 NPS 2 [DN 50] and Larger—Walls through extra
strong weights, shall be plain-end-beveled.
19.1.3 NPS 2 [DN 50] and Larger—Walls over extra strong
weights, shall be plain-end square cut.
19.2 Plain-end beveled pipe shall be plain-end pipe having
a bevel angle of 30°, + 5° or - 0°, as measured from a line
drawn perpendicular to the axis of the pipe with a root face of
1⁄16 6 1⁄32 in. [1.6 6 0.8 mm]. Other bevel angles may be
specified by agreement between the purchaser and the manufacturer.
20. Sampling
20.1 For product analysis (see 9.1) and tensile tests (see
21.1), a lot is the number of lengths of the same size and wall
thickness from any one heat of steel; of 400 lengths or fraction
thereof, of each size up to, but not including, NPS 6 [DN 150];
and of 200 lengths or fraction thereof of each size NPS 6 [DN
150] and over.
20.2 For bend tests (see 21.2), a lot is the number of lengths
of the same size and wall thickness from any one heat of steel,
of 400 lengths or fraction thereof, of each size.
20.3 For flattening tests, a lot is the number of lengths of the
same size and wall thickness from any one heat of steel, of 400
lengths or fraction thereof of each size over NPS 2 [DN 50], up
to but not including NPS 6 [DN 150], and of 200 lengths or
fraction thereof, of each size NPS 6 [DN 150] and over.
21. Number of Tests
21.1 The tensile requirements specified in Section 10 shall
be determined on one length of pipe from each lot (see 20.1).
21.2 For pipe NPS 2 [DN 50] and under, the bend test
specified in 11.1 shall be made on one pipe from each lot (see
20.2). The bend test, where used as required by 11.2, shall be
made on one end of 5 % of the pipe from each lot. For small
lots, at least one pipe shall be tested.
21.3 If any test specimen shows flaws or defective machining,
it shall be permissible to discard it and substitute another
test specimen.
22. Retests
22.1 If the percentage of elongation of any tension test
specimen is less than that given in Table 1 and any part of the
fracture is more than 3⁄4 in. [19 mm] from the center of the
gage length of a 2-in. [50-mm] specimen as indicated by scribe
scratches marked on the specimen before testing, a retest shall
be allowed. If a specimen breaks in an inside or outside surface
flaw, a retest shall be allowed.
23. Test Specimens and Test Methods
23.1 On NPS 8 [DN 200] and larger, specimens cut either
longitudinally or transversely shall be acceptable for the
tension test. On sizes smaller than NPS 8 [DN 200], the
longitudinal test only shall be used.
23.2 When round tension test specimens are used for pipe
wall thicknesses over 1.0 in. [25.4 mm], the mid–length of the
longitudinal axis of such test specimens shall be from a
location midway between the inside and outside surfaces of the
pipe.
23.3 Test specimens for the bend test specified in Section 11
and for the flattening tests shall consist of sections cut from a
pipe. Specimens for flattening tests shall be smooth on the ends
and free from burrs, except when made on crop ends.
23.4 Test specimens for the bend test specified in 11.2 shall
be cut from one end of the pipe and, unless otherwise specified,
shall be taken in a transverse direction. One test specimen shall
be taken as close to the outer surface as possible and another
from as close to the inner surface as possible. The specimens
shall be either 1⁄2 by 1⁄2 in. [12.5 by 12.5 mm] in section or 1 by
1⁄2 in. [25 by 12.5 mm] in section with the corners rounded to
a radius not over 1⁄16 in. [1.6 mm] and need not exceed 6 in.
[150 mm] in length. The side of the samples placed in tension
during the bend shall be the side closest to the inner and outer
surface of the pipe respectively.
23.5 All routine check tests shall be made at room temperature.
24. Certification
24.1 When test reports are requested, in addition to the
requirements of Specification A 530/A 530M, the producer or
supplier shall furnish to the purchaser a chemical analysis
report for the elements specified in Table 1.
25. Product Marking
25.1 In addition to the marking prescribed in Specification
A 530/A 530M, the marking shall include heat number, the
information as per Table 4, an additional symbol “S” if one or

TABLE 4   Marking

Hydro

NDE

Marking

Yes No No Yes

No Yes No Yes

Test Pressure
NDE NH
Test Pressure/NDE

more of the supplementary requirements apply; the length, OD
1 %, if ordered as special outside diameter tolerance pipe; ID
1 %, if ordered as special inside diameter tolerance pipe; the
schedule number, weight class, or nominal wall thickness; and,
for sizes larger than NPS 4 [DN 100], the weight. Length shall
be marked in feet and tenths of a foot [metres to two decimal
places], depending on the units to which the material was
ordered, or other marking subject to agreement. For sizes NPS
11⁄2 , 11⁄4 , 1, and 3⁄4 [DN 40, 32, 25, and 20], each length shall
be marked as prescribed in SpecificationA 530/A 530M. These
sizes shall be bundled in accordance with standard mill practice
and the total bundle footage marked on the bundle tag;
individual lengths of pipe need not be marked with footage.
For sizes less than NPS 3⁄4 [DN 20], all the required markings
shall be on the bundle tag or on each length of pipe and shall
include the total footage; individual lengths of pipe need not be
marked with footage. If not marked on the bundle tag, all
required marking shall be on each length.
25.2 When pipe sections are cut into shorter lengths by a
subsequent processor for resale as material, the processor shall
transfer complete identifying information, including the name
or brand of the manufacturer to each unmarked cut length, or
to metal tags securely attached to bundles of unmarked small
diameter pipe. The same material designation shall be included
with the information transferred, and the processor’s name,
trademark, or brand shall be added.
25.3 Bar Coding—In addition to the requirements in 25.1
and 25.2, bar coding is acceptable as a supplementary identification
method. The purchaser may specify in the order a
specific bar coding system to be used.
26. Government Procurement
26.1 When specified in the contract, material shall be
preserved, packaged, and packed in accordance with the
requirements of MIL-STD-163. The applicable levels shall be
as specified in the contract. Marking for the shipment of such
material shall be in accordance with Fed. Std. No. 123 for civil
agencies and MIL-STD-129 or Fed. Std. No. 183 if continuous
marking is required for military agencies.
26.2 Inspection—Unless otherwise specified in the contract,
the producer is responsible for the performance of all inspection
and test requirements specified herein. Except as otherwise
specified in the contract, the producer shall use his own, or any
other suitable facilities for the performance of the inspection
and test requirements specified herein, unless disapproved by
the purchaser. The purchaser shall have the right to perform
any of the inspections and tests set forth in this specification
where such inspections are deemed necessary to ensure that the
material conforms to the prescribed requirements.
27. Keywords
27.1 carbon steel pipe; seamless steel pipe; steel pipe

SUPPLEMENTARY REQUIREMENTS

One or more of the following supplementary requirements shall apply only when specified in the
purchase order. The purchaser may specify a different frequency of test or analysis than is provided
in the supplementary requirement. Subject to agreement between the purchaser and manufacturer,
retest and retreatment provisions of these supplementary requirements may also be modified.

S1. Product Analysis
S1.1 Product analysis shall be made on each length of pipe.
Individual lengths failing to conform to the chemical composition
requirements shall be rejected.
S2. Transverse Tension Test
S2.1 A transverse tension test shall be made on a specimen
from one end or both ends of each pipe NPS 8 [DN 200] and
over. If this supplementary requirement is specified, the number
of tests per pipe shall also be specified. If a specimen from
any length fails to meet the required tensile properties (tensile,
yield, and elongation), that length shall be rejected subject to
retreatment in accordance with Specification A 530/A 530M
and satisfactory retest.
S3. Flattening Test, Standard
S3.1 For pipe over NPS 2 [DN 50], a section of pipe not less
than 21⁄2 in. [63.5 mm] in length shall be flattened cold
between parallel plates until the opposite walls of the pipe
meet. Flattening tests shall be in accordance with Specification
A 530/A 530M, except that in the formula used to calculate the
“H” value, the following “ e” constants shall be used:
0.08 for Grade A
0.07 for Grades B and C
S3.2 When low D-to-t ratio tubulars are tested, because the
strain imposed due to geometry is unreasonably high on the
inside surface at the six and twelve o’clock locations, cracks at
these locations shall not be cause for rejection if the D-to-t ratio
is less than ten.
S3.3 The flattening test shall be made on one length of pipe
from each lot of 400 lengths or fraction thereof of each size
over NPS 2 [DN 50], up to but not including NPS 6 [DN 150],
and from each lot of 200 lengths or fraction thereof, of each
size NPS 6 [DN 150] and over.
S3.4 Should a crop end of a finished pipe fail in the
flattening test, one retest is permitted to be made from the
failed end. Pipe shall be normalized either before or after the
first test, but pipe shall be subjected to only two normalizing
treatments.
S4. Flattening Test, Enhanced
S4.1 The flattening test of Specification A 530/A 530M
shall be made on a specimen from one end or both ends of each
pipe. Crop ends may be used. If this supplementary requirement
is specified, the number of tests per pipe shall also be

specified. If a specimen from any length fails because of lack
of ductility prior to satisfactory completion of the first step of
the flattening test requirement, that pipe shall be rejected
subject to retreatment in accordance with Specification A 530/
A 530M and satisfactory retest. If a specimen from any length
of pipe fails because of a lack of soundness, that length shall be
rejected, unless subsequent retesting indicates that the remaining
length is sound.
S5. Metal Structure and Etching Test
S5.1 The steel shall be homogeneous as shown by etching
tests conducted in accordance with the appropriate sections of
Method E 381. Etching tests shall be made on a cross section
from one end or both ends of each pipe and shall show sound
and reasonably uniform material free from injurious laminations,
cracks, and similar objectionable defects. If this supplementary
requirement is specified, the number of tests per pipe
required shall also be specified. If a specimen from any length
shows objectionable defects, the length shall be rejected,
subject to removal of the defective end and subsequent retests
indicating the remainder of the length to be sound and
reasonably uniform material.
S6. Carbon Equivalent
S6.1 The steel shall conform to a carbon equivalent (CE) of
0.50 maximum as determined by the following formula:

S6.2 A lower CE maximum may be agreed upon between
the purchaser and the producer.
S6.3 The CE shall be reported on the test report.
S7. Heat Treated Test Specimens
S7.1 At the request of the purchaser, one tensile test shall be
performed by the manufacturer on a test specimen from each
heat of steel furnished which has been either stress relieved at
1250 °F or normalized at 1650 °F, as specified by the
purchaser. Other stress relief or annealing temperatures, as
appropriate to the analysis, may be specified by agreement
between the purchaser and the manufacturer. The results of this
test shall meet the requirements of Table 1.
S8. Internal Cleanliness–Government Orders
S8.1 The internal surface of hot finished ferritic steel pipe
and tube shall be manufactured to a free of scale condition
equivalent to the visual standard listed in SSPC-SP 6. Cleaning
shall be performed in accordance with a written procedure that
has been shown to be effective. This procedure shall be
available for audit.
S9. Requirements for Carbon Steel Pipe for Hydrofluoric
Acid Alkylation Service
S9.1 Pipe shall be provided in the normalized heat-treated
condition.
S9.2 The carbon equivalent (CE), based upon heat analysis,
shall not exceed 0.43 % if the specified wall thickness is equal
to or less than 1 in. [25.4 mm] or 0.45 % if the specified wall
thickness is greater than 1 in. [25.4 mm].
S9.3 The carbon equivalent (CE) shall be determined using
the following formula:
CE = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
S9.4 Based upon heat analysis in mass percent, the vanadium
content shall not exceed 0.02 %, the niobium content
shall not exceed 0.02 %, and the sum of the vanadium and
niobium contents shall not exceed 0.03 %.
S9.5 Based upon heat analysis in mass percent, the sum of
the nickel and copper contents shall not exceed 0.15 %.
S9.6 Based upon heat analysis in mass percent, the carbon
content shall not be less than 0.18 %.
S9.7 Welding consumables of repair welds shall be of low
hydrogen type. E60XX electrodes shall not be used and the
resultant weld chemical composition shall meet the chemical
composition requirements specified for the pipe.
S9.8 The designation “HF-N” shall be stamped or marked
on each pipe to signify that the pipe complies with this
supplementary requirement.