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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


astm a554 Chemical Composition :

Grade Composition Percentage, max or range
%
C
%
Mn
%
P
%
S
%
Si
%
Ni
%
Cr
%
Mo
Note
Austenitic Stainless Steels:
MT301 0.15 2.00 0.040 0.030 1.00 6.0-8.0 16.0-18.0 -  
MT302 0.15 2.00 0.040 0.030 1.00 8.0-10.0 17.0-19.0 -  
MT304 0.08 2.00 0.040 0.030 1.00 8.0-11.0 18.0-20.0 -  
MT304L 0.035 2.00 0.040 0.030 1.00 8.0-13.0 18.0-20.0 - 4
MT305 0.12 2.00 0.040 0.030 1.00 10.0-13.0 17.0-19.0 -  
MT309S 0.08 2.00 0.040 0.030 1.00 12.0-15.0 22.0-24.0 -  
MT309SCb 0.08 2.00 0.040 0.030 1.00 12.0-15.0 22.0-24.0 - 1
MT310S 0.08 2.00 0.040 0.030 1.00 19.0-22.0 24.0-26.0 -  
MT316 0.08 2.00 0.040 0.030 1.00 10.0-14.0 16.0-18.0 2.0-3.0  
MT316L 0.035 2.00 0.040 0.030 1.00 10.0-15.0 16.0-18.0 2.0-3.0 4
MT317 0.08 2.00 0.040 0.030 1.00 11.0-14.0 18.0-20.0 3.0-4.0  

MT321
0.08 2.00 0.040 0.030 1.00 9.0-13.0 17.0-20.0 - 2
MT330 0.15 2.00 0.040 0.030 1.00 33.0-36.0 14.0-16.0 -  
MT347 0.08 2.00 0.040 0.030 1.00 9.0-13.0 17.0-20.0 - 1
Ferritic Stainless Steels:
MT429 0.12 1.00 0.040 0.030 1.00 0.50
max
14.0-
16.0
-  
MT430 0.12 1.00 0.040 0.030 1.00 0.50
max
16.0-
18.0
-  
MT430Ti 0.10 1.00 0.040 0.030 1.00 0.075 16.0-
19.5
- 3


Composition Notes
1 Niobium + Tantalum >10 x Carbon and 1.00% max
2 Titanium >5 x Carbon and 0.60% max
3 Titanium >5 x Carbon and 0.75% max
4 Carbon 0.040% max is necessary for tubes where many drawing passes are required, as with
outside diameter <0.5 in (12.7 mm) or nominal wall thickness <0.049 in (1.2 mm) (minimum wall
thickness <0.044 in (1.12 mm))
Note
- Niobium is sometimes referred to as Columbium

 

Designation: A 554 – 03
Standard Specification for
Welded Stainless Steel Mechanical Tubing1
This standard is issued under the fixed designation A 554; 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 specification covers welded stainless steel tubing
for mechanical applications where appearance, mechanical
properties, or corrosion resistance is needed. The grades
covered are listed in Table 1.
1.2 This specification covers as-welded or cold-reduced
mechanical tubing in sizes to 16 in. (406.4 mm) outside
dimension, and in wall thicknesses 0.020 in. (0.51 mm) and
over.
1.3 Tubes shall be furnished in one of the following shapes
as specified by the purchaser: round, square, rectangular, or
special.
1.4 Supplementary requirements of an optional nature are
provided and when desired shall be so stated in the order.
1.5 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
information only.
2. Referenced Documents
2.1 ASTM Standards: 2
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
E 30 Test Methods for Chemical Analysis of Steel, Cast
Iron, Open-Hearth Iron, and Wrought Iron3
E 59 Practice for Sampling Steel and Iron for Determination
of Chemical Composition3
2.2 Military Standards:
MIL-STD-129 Marking for Shipment and Storage4
MIL-STD-163 Steel Mill Products Preparation for Shipment
and Storage4
2.3 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)4
3. Ordering Information
3.1 Orders for material under this specification should
include the following, as required, to describe the desired
material adequately:
3.1.1 Quantity (feet, mass, or number of pieces),
3.1.2 Name of material (welded stainless steel mechanical
tubing),
3.1.3 Form (round, square, rectangular, special, see 1.3),
3.1.4 Dimensions:
3.1.4.1 Round-outside diameter and wall thickness for all
conditions (Section 8). Alternatively, for cold-reduced condition,
outside diameter and inside diameter or inside diameter
and wall dimensions may be specified,
3.1.4.2 Square and rectangular outside dimensions and wall
thickness (see 9.1),
3.1.4.3 Special (to be specified),
3.1.5 Length (mill lengths, cut lengths, or multiple lengths
(see 8.3)),
3.1.6 Grade (Table 1),
3.1.7 Condition (see 6.1),
3.1.8 Inside diameter bead condition (see 6.2),
3.1.9 Surface finish (see Section 11),
3.1.10 Report of chemical analysis, if required (Section 7),
3.1.11 Individual supplementary requirements, if required,
3.1.12 End use,
3.1.13 Specification designation,
3.1.14 Special requirements,
3.1.15 Special marking (Section 14), and
3.1.16 Special packing (Section 15).
4. Process
4.1 The steel may be made by any process.
4.2 If a specific type of melting is required by the purchaser,
it shall be stated on the purchase order.
4.3 The primary melting may incorporate separate degassing
or refining and may be followed by secondary melting,
such as electroslag remelting or vacuum-arc remelting. If
secondary melting is employed, the heat shall be defined as all
of the ingots remelted from a single primary heat.
1 This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.10 on Tubing.
Current edition approved Sept. 10, 2003. Published October 2003. Originally
approved in 1965. Last previous edition approved in 1998 as A 554 – 98e1.
2 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.
3 Withdrawn
4 Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Robbins Ave., Philadelphia, PA 19111–5094, Attn: NPODS.
1
*A Summary of Changes section appears at the end of this standard.
4.4 Steel may be cast in ingots or may be strand cast. When
steel of different grades are sequentially strand cast, identification
of the resultant transition material is required. The
producer shall remove the transition material by an established
procedure that positively separates the grades.
5. Materials and Manufacture
5.1 The tubes shall be made from flat-rolled steel by an
automatic welding process without the addition of filler metal.
6. Condition
6.1 The tubes shall be furnished in any of the following
conditions as specified:
6.1.1 As welded,
6.1.2 Welded and annealed,
6.1.3 Cold reduced,
6.1.4 Cold reduced and annealed.
6.2 The inside diameter bead shall be furnished in any of the
following conditions as specified:
6.2.1 Bead not removed,
6.2.2 Bead controlled to 0.005 in. (0.13 mm) or 15 % of the
specified wall thickness, whichever is greater, and
6.2.3 Bead removed.
7. Heat Analysis
7.1 An analysis of each heat of steel shall be made by the
steel manufacturer to determine the percentages of the elements
specified. If secondary melting processes 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 tubular product manufacturer,
shall conform to requirements specified. When requested
in the order or contract, a report of this analysis shall be
furnished to the purchaser. (See Test Methods E 30 and
Practice E 59.)
8. Permissible Variations in Dimensions—Round Tubing
8.1 For all conditions except tubing with bead removed,
Table 2 shall apply.
8.2 For tubing with bead removed, Table 3 shall apply.
8.3 Lengths—Tubing is normally furnished in mill lengths 5
ft (1.5 m) and over. Definite cut lengths are furnished when
specified, to the length tolerances shown in Table 4. For tubing
ordered in multiple lengths, it is common practice to allow a
definite amount over for each multiple for the purchaser’s
cutting operation. Thus cutting allowance should be specified
in the purchase order.
8.4 Straightness Tolerance—The straightness tolerance
shall be 0.030 in. (0.76 mm) maximum in any 3-ft (0.9-m)
length of tubing. The straightness tolerance on shorter lengths
and on special requirements shall be agreed upon between the
purchaser and producer.
9. Permissible Variations in Dimensions—Square and
Rectangular Tubing
9.1 Square and rectangular welded stainless mechanical
tubing is supplied as cold worked unless otherwise specified.
For this tubing, variations in dimensions from those specified
shall not exceed the amounts prescribed in Table 5. For lengths,
see 8.3.
10. Workmanship, Finish, and Appearance
10.1 Finished tubes shall have smooth ends free of burrs.
They shall be free of injurious defects and shall have a

NOTE 1—Ovality is the difference between maximum and minimum outside diameters measured at any one cross section. There is no additional
tolerance for ovality on tubes having a specified wall thickness of more than 3 % of the outside diameter.
NOTE 2—For sizes up to and including 5-in. (127.0-mm) outside diameter, an ovality tolerance of twice the tabular outside diameter tolerance spread
shown is applied one half plus and one half minus to tubes having a specified wall thickness of 3 % or less of the specified outside diameter. The average
of the maximum and minimum outside diameter readings should fall within the outside diameter tolerances as shown in this table.
NOTE 3—For sizes over 5-in. (127.0-mm) to and including 16-in. (406.4-mm) outside diameter, when the specified wall thickness is 3 % or less of the
outside diameter, the ovality shall not exceed 1.5 % of the specified outside diameter.

OD Size, in. (mm)

 

Wall Thickness

 

OD, 6

 

in.

mm

in.

 

mm

Under 1⁄2  (12.7)

0.020 to 0.049

0.51 to 1.24

0.004

 

0.10

1⁄2  to 1 (12.7 to 25.4)

0.020 to 0.065

0.51 to 1.65

0.005

 

0.13

1⁄2  to 1 (12.7 to 25.4)

over 0.065 to 0.134

over 1.65 to 3.40

0.010

 

0.25

Over 1 to 1 1⁄2  (25.4 to 38.1), incl

0.025 to 0.065

0.64 to 1.65

0.008

 

0.20

Over 1 to 1 1⁄2  (25.4 to 38.1), incl

over 0.065 to 0.134

over 1.65 to 3.40

0.010

 

0.25

Over 1 1⁄2  to 2 (38.1 to 50.8), incl

0.025 to 0.049

0.64 to 1.24

0.010

 

0.25

Over 1 1⁄2  to 2 (38.1 to 50.8), incl

over 0.049 to 0.083

over 1.24 to 2.11

0.011

 

0.28

Over 1 1⁄2  to 2 (38.1 to 50.8), incl

over 0.083 to 0.149

over 2.11 to 3.78

0.012

 

0.30

Over 2 to 2 1⁄2  (50.8 to 63.5), incl

0.032 to 0.065

0.81 to 1.65

0.012

 

0.30

Over 2 to 2 1⁄2  (50.8 to 63.5), incl

over 0.065 to 0.109

over 1.65 to 2.77

0.013

 

0.33

Over 2 to 2 1⁄2  (50.8 to 63.5), incl

over 0.109 to 0.165

over 2.77 to 4.19

0.014

 

0.36

Over 2 1⁄2  to 3 1⁄2  (63.5 to 88.9), incl

0.032 to 0.165

0.81 to 4.19

0.014

 

0.36

Over 2 1⁄2  to 3 1⁄2  (63.5 to 88.9), incl

over 0.165

over 4.19

0.020

 

0.51

Over 3 1⁄2  to 5 (88.9 to 127.0), incl

0.035 to 0.165

0.89 to 4.19

0.020

 

0.51

Over 3 1⁄2  to 5 (88.9 to 127.0), incl

over 0.165

over 4.19

0.025

 

0.64

Over 5 to 7 1⁄2  (127.0 to 190.5), incl

0.049 to 0.250

1.24 to 6.35

0.025

 

0.64

Over 5 to 7 1⁄2  (127.0 to 190.5), incl

over 0.250

over 6.35

0.030

 

0.76

Over 7 1⁄2  to 16 (190.5 to 406.4), incl                               all                                             all                                             0.00125 in./in. or mm/mm of circumference

workmanlike finish. Surface imperfections such as handling
marks, straightening marks, light mandrel and die marks,
shallow pits, and scale patterns will not be considered as
serious defects, provided the imperfections are removable
within 10 % of the specified wall or 0.002 in. (0.05 mm),
whichever is greater. The removal of surface imperfections is
not required, unless special finishes are specified.
11. Surface Finish
11.1 Tubes shall be free of scale.
11.2 If special surface conditioning is required, they shall be
stated in the order.
12. Rejection
12.1 Tubing that fails to meet the requirements of this
specification shall be set aside and the manufacturer notified.
13. Coating
13.1 Stainless steel tubing is commonly shipped without
protective coating. If special protection is needed, details shall
be specified in the order.

NOTE 1—Ovality is the difference between maximum and minimum
outside diameters measured at any one cross section. There is no
additional tolerance for ovality on tubes having a specified wall thickness
of more than 3 % of the outside diameter.
NOTE 2—An ovality allowance of twice the outside diameter tolerance,
shown in this table, is applied one half plus and one half minus to the
outside diameter, for tubes having a specified wall thickness of 3 % or less
of the specified outside diameter. The average of the maximum and
minimum outside diameter readings should fall within the outside
diameter tolerances of this table.
NOTE 3—Tubing may be specified to only two of the three following
dimensions—outside diameter, inside diameter, or wall.

TABLE 4 Length Variations—Cut Length Tubes

Length, ft (m)
Outside Diameter, in. (mm)
Permissible Variations in Length, in.
OverA                    Under

101.6), incl

3.0), incl

 

in.

mm

 

4 (1.2) and under

up to 2 (50.8), incl

1⁄16

1.6

0

 

over 2 to 4 (50.8 to

3⁄32

2.4

0

 

over 4 (101.6)

1⁄8

3.2

0

Over 4 to 10 (1.2 to

up to 2 (50.8), incl

3⁄32

2.4

0

 

over 2 (50.8)

1⁄8

3.2

0

Over 10 to 24 (3.0 to

all sizes

3⁄16

4.8

0

7.3), incl
A  For all diameters in lengths over 24 ft (7.3 m), an additional over tolerance of
1⁄8  in. (3.2 mm) for each 10 ft (3.0 m) or fraction thereof shall be permissible, up to a tolerance of 1⁄2  in. (12.7 mm), max.

14. Product Marking
14.1 Civilian Procurement—Each box, bundle or lift, and
piece (when individual pieces are shipped) shall be identified
by a tag or stencil with the manufacturer’s name or brand,
specified size, purchaser’s order number, this specification
number, and grade. Bar coding is acceptable as a supplementary
identification method. Bar coding should be consistent
with the Automotive Industry Action Group (AIAG) standard
prepared by the Primary Metals Subcommittee of the AIAG
Bar Code Project Team.
14.2 Government Procurement—When specified in the contract
or order, and for direct procurement by or direct shipment
to the government, marking for shipment, in addition to
requirements specified in the contract or order, shall be in
accordance with MIL-STD-129 for Military agencies and in
accordance with Fed. Std. No. 123 for civil agencies.
15. Packaging
15.1 Civilian Procurement—On tubing of 0.065-in. (1.65-
mm) wall and lighter, the manufacturer will, at his option, box,
crate, carton, package in secure lifts or bundles to ensure safe
delivery. Tubing heavier than 0.065-in. wall will normally be
shipped loose, bundled, or in secured lifts. Special packaging
requiring extra operations other than those normally used by
the manufacturer must be specified in the order.
15.2 Government Procurement—When specified in the contract
or order, and for direct procurement by or direct shipment
to the government when Level A is specified, preservation,

packaging, and packing shall be in accordance with the Level
A requirements of MIL-STD-163.
16. Keywords
16.1 austenitic stainless steel; mechanical tubing; stainless
steel tube; steel tube; welded steel tube

SUPPLEMENTARY REQUIREMENTS

These requirements shall not be considered unless specified in the order and the necessary tests
made at the mill. Mechanical tests shall be performed in accordance with the applicable sections of
Test Methods and Definitions A 370.

S1. Hardness Test
S1.1 Round annealed tubes shall conform to the requirements
as to the hardness limits prescribed in Table S1.1.
NOTE S1—There are tubing diameters, walls, or combinations which
limit the applicability of particular hardness values.
S1.2 When specified, the hardness test shall be performed on a
specimen from one tube from each 2500 ft (760 m) or fraction thereof
from each heat of steel.
S2. Tension Test
S2.1 The tubes shall conform to the requirements as to
tensile properties prescribed in Table S2.1. When cold-reduced
tempers are ordered, the manufacturer shall be consulted.
S2.2 When the tension test is specified, one test shall be
performed on a specimen from one tube of each lot of 2500 ft
(760 m) or fraction thereof from each heat of steel, prior to
cutting to length.
S2.3 The yield strength corresponding to a permanent offset
of 0.2 % of the gage length of the specimen or to a total
extension of 0.5 % of the gage length under load shall be
determined.
S3. Nondestructive Test
S3.1 Various types of nondestructive test are available.
When any such test is required, the test to be used and the
inspection limits shall be specified in the order.
S4. Test Reports
S4.1 Mill test reports will be furnished when specified in the
order.
S4.2 When specified on the purchase order, or when a
specific type of melting has been specified, the type of melting
used to produce the material shall be included with the test
report.

S5. Certification for Government Orders
S5.1 A producer’s or supplier’s certification shall be furnished
to the government that the material was manufactured,
sampled, tested, and inspected in accordance with this specification
and has been found to meet the requirements. This
certificate shall include a report of heat analysis (product
analysis when requested in the purchase order), and, when
specified in the purchase order or contract, a report of test
results shall be furnished.
S6. Rejection Provisions for Government Orders
S6.1 Each length of tubing received from the manufacturer
may be inspected by the purchaser and, if it does not meet the
requirements of the specification based on the inspection and
test method as outlined in the specification, the tube may be
rejected and the manufacturer shall be notified. Disposition of
rejected tubing shall be a matter of agreement between the
manufacturer and the purchaser.
S6.2 Material that fails in any of the forming operations or
in the process of installation and is found to be defective shall
be set aside, and the manufacturer shall be notified for mutual
evaluation of the material’s suitability. Disposition of such
material shall be a matter for agreement.