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Rolf Engg. Solutions Inc. supply and manufacture Stainless, Alloy and Carbon Steels.

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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

We supply A 270 steel tubes in sizes up to and including 12 in. (304.8 mm) in outside diameter.
A 270 Chemical Properties:

Grade C Mn P S Si Ni Cr Mo

ASTM TP 304 

≦0.08

≦2.00

≦0.045

≦0.03

≦1.00

8.00~11.00

18.00~20.00

 

ASTM TP 304L 

≦0.035

≦2.00

≦0.045

≦0.03

≦1.00

8.00~12.00

18.00~20.00

 

ASTM TP 316

≦0.08

≦2.00

≦0.045

≦0.03

≦1.00

10.00~14.00

16.00~18.00

2.00~3.00

ASTM TP 316L

≦0.035

≦2.00

≦0.045

≦0.03

≦1.00

10.00~14.00

16.00~18.00

2.00~3.00

A 270 Tensile Requirements

Grade  Tensile Point (Mpa)  Yield Point (Mpa) Elongation in 2 in. min, (%)

ASTM TP 304 

515

205

35

ASTM TP 304L 

485

170

35

ASTM TP 316

515

205

35

ASTM TP 316L

485

170

35

 

Designation: A 270 – 03a

Standard Specification for
Seamless and Welded Austenitic and Ferritic/Austenitic
Stainless Steel Sanitary Tubing

1. Scope*
1.1 This specification covers grades of seamless, welded,
and heavily cold worked welded austenitic and ferritic/
austenitic stainless steel sanitary tubing intended for use in the
dairy and food industry and having special surface finishes.
Pharmaceutical quality may be requested, as a supplementary
requirement.
1.2 This specification covers tubes in sizes up to and
including 12 in. (304.8 mm) in outside diameter.
1.3 The values stated in inch-pound units are to be regarded
as the standard.
1.4 Optional supplementary requirements are provided, and
when one or more of these are desired, each shall be so stated
in the order.
2. Referenced Documents
2.1 ASTM Standards: 2
A 262 Practices for Detecting Susceptibility to Intergranular
Attack in Austenitic Stainless Steels
A 480/A 480M Specification for General Requirements for
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
Sheet, and Strip
A 923 Test Methods for Detecting Detrimental Intermetallic
Phase in Wrought Duplex Austenitic/Ferritic Stainless
Steels
A 967 Specification for Chemical Passivation Treatments
for Stainless Steel Parts
A 1016/A 1016M Specification for General Requirements
for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless
Steel Tubes
E 527 Practice for Numbering Metals and Alloys (UNS)
2.2 ASME Standard:
B46.1 Surface Texture (Surface Roughness, Waviness, and
Lay)3
2.3 ASME Boiler and Pressure Vessel Code:
Section VIII Pressure Vessels3
2.4 Other Standard:
SAE J1086 Practice for Numbering Metals and Alloys
(UNS)4
3. Terminology
3.1 Definition:
3.1.1 roughness average, Ra, n—arithmetic average surface
roughness normally reported in microinches or microns; a
measurement of surface roughness usually performed by moving
a stylus in a straight line along the surface, although other
methods may be used.
4. Ordering Information
4.1 It is the responsibility of the purchaser to specify all
requirements that are necessary for material ordered under this
specification. Such requirements may include, but are not
limited to, the following:
4.1.1 Quantity (feet, metres, or number of lengths),
4.1.2 Name of material (austenitic steel tube),
4.1.3 Process seamless (SML), welded (WLD), or heavily
cold worked (HCW),
4.1.4 Size (outside diameter and average wall thickness),
4.1.5 Length (specific or random),
4.1.6 Surface finish (Section 13),
4.1.7 Optional requirements (product analysis, see Section
9; hydrostatic or nondestructive electric test, see Section11).
4.1.8 Test report required (Certification Section of Specification
A 1016/A 1016M),
4.1.9 Specification designation,
4.1.10 Special requirements, and

4.2 Any supplementary requirements.
5. General Requirements
5.1 Material furnished under this specification shall conform
to the applicable requirements of the current edition of
Specification A 1016/A 1016M, unless otherwise provided
herein.
6. Manufacture
6.1 The tubes shall be manufactured by one of the following
processes:
6.1.1 Seamless (SML) tubes shall be made by a process that
does not involve welding at any stage.
6.1.2 Welded (WLD) tubes shall be made using an automated
welding process with no addition of filler metal during
the welding process.
6.1.3 Heavily cold worked (HCW) tubes shall be made by
applying cold working of not less than 35 % reduction of
thickness of both wall and weld to a welded tube prior to the
final anneal. No filler shall be used in making the weld. Prior
to cold working, the weld shall be 100 % radiographically
inspected in accordance with the requirements of ASME Boiler
and Pressure Vessel Code Section VIII, Division 1, latest
revision, Paragraph UW 51.
6.2 At the manufacturer’s option, tubing may be furnished
either hot finished or cold finished.
7. Heat Treatment
7.1 All material shall be furnished in the heat-treated
condition. The heat treatment procedure, except for S31803,
S32003, S32205, S32750, N08926 and N08367, shall consist
of heating the material to a minimum temperature of 1900°F
(1040°C) and quenching in water or rapid cooling by other
means.
7.2 N08926 shall be heat-treated to a minimum temperature
of 2010°F [1100°C] followed by quenching in water or rapidly
cooling by other means. UNS N08367 should be solution
annealed from 2025°F [1107°C] minimum followed by rapid
quenching.
7.3 S31803 and S32205 shall be heat-treated in a temperature
range of 1870°F [1020°C] to 2010°F [1100°C] followed
by quenching in water or rapidly cooling by other means.
7.4 S32750 shall be heat-treated in a temperature range of
1880°F [1025°C] to 2060°F [1125°C] followed by quenching
in water or rapidly cooling by other means.
7.5 S32003 shall be heat-treated in a temperature range of
1850°F (1010°C) to 2010°F (1100°C).
8. Chemical Composition
8.1 An analysis of either one length of flat-rolled stock or
one tube shall be made for each heat. The chemical composition
thus determined shall conform to the requirements given in
Table 1.
9. Product Analysis
9.1 When requested by the purchaser, product analysis
tolerance in Specification A 480/A 480M shall apply. The
product analysis tolerance is not applicable to the carbon
content for material with a specified maximum carbon of
0.04 % or less.
9.2 If the original test for product analysis fails, retests of
two additional lengths of flat-rolled stock or tubes shall be
made. Both retests for the elements in question shall meet the
requirements of the specification; otherwise all remaining
material in the heat or lot (Note 1) shall be rejected or, at the
option of the producer, each length of flat-rolled stock or tube
may be individually tested for acceptance. Lengths of flat
rolled stock or tubes that do not meet the requirements of the
specification shall be rejected.
10. Mechanical Tests Required
10.1 Reverse Flattening Test—For welded tubes, one reverse
flattening test shall be made on a specimen from each
1500 ft (457 m) of finished tubing.
11. Hydrostatic or Nondestructive Electric Test
11.1 Each tube shall be subjected to the nondestructive
electric test or the hydrostatic test. The type of test to be used
shall be at the option of the manufacturer, unless otherwise
specified in the purchase order.
12. Permissible Variations in Dimensions
12.1 The following variations in dimensions shall apply:
12.1.1 For tubes with a specified wall thickness of 0.049 in.
(1.24 mm) and greater, variations in outside diameter from
those specified shall not exceed the amount prescribed in Table
2. For tubes with a specified wall thickness less than 0.049 in.
(1.24 mm), the diameter tolerances shall be a matter for
agreement by the manufacturer and the purchaser.
12.1.2 When tubing >4 in. (101.6 mm) outside diameter is
ordered, additional ovality may be required for thin wall
tubing. Thin wall tubing applies when the specified wall is less
than 0.150 in. (3.81 mm). When thin wall tubing is ordered, the
maximum and minimum outside diameter at any cross section
shall deviate from the specified outside diameter by no more
than twice the permissible variation in outside diameter given
in Table 2; however, the mean diameter at that cross section
must still be within the given permissible variation.
12.1.3 The wall thickness at any point shall not vary more
than 12.5 %, from the specified wall thickness.
12.1.4 Variations in length shall meet the requirements in
Table 2 except when the Pharmaceutical Quality Tubing
(Supplementary Requirement S2) is specified.
13. Surface Finishes
13.1 The following surface finishes may be specified:
13.1.1 Mill Finish—Afinish without additional polishing or
operations intended to smooth the surface.
13.1.2 Mechanically Polished Surface Finish—The purchaser
may specify one of the following finish numbers for a
mechanically polished surface:
13.1.2.1 Finish No. 80—A ground finish produced by polishing
a tube with an abrasive media impregnated with No. 80
grit.

13.1.2.2 Finish No. 120—A ground finish produced by
polishing a tube with an abrasive media impregnated with No.
120 grit.
13.1.2.3 Finish No. 180—A ground finish produced by
polishing a tube with an abrasive media impregnated with No.
180 grit.
13.1.2.4 Finish No. 240—A ground finish produced by
polishing a tube with an abrasive media impregnated with No.
240 grit.
13.1.2.5 Other mechanically polished finishes may be
agreed upon between the purchaser and manufacturer.
13.1.3 Electropolished Finish—A bright reflective finish
produced by electropolishing. The manufacturer may use other
polishing operations prior to electropolishing.
13.1.4 Maximum Roughness Average (Ra) Surface Finish—
The customer may specify a maximum Ra on the inside
surface, outside surface, or both. The measurement of surface
roughness shall be in accordance with ASME B46.1.
13.1.4.1 When no agreement is made regarding Ra measurement
of longitudinally polished tube, disputes shall be
resolved using measurements made in accordance with ASME
B46.1.
13.2 The manufacturer shall select a manufacturing method
to produce the specified finish. The operations may or may not
include polishing.
13.2.1 The purchaser may specify the polishing type for
either the inside surface, outside surface or both for the final
desired effect.
13.2.1.1 Longitudinally Polished Finish— It is usually performed
on the inside surface only.
13.2.1.2 Circumferential (Rotary) Polished Finish—This
can be performed on either the inside surface, outside surface,
or both.
13.2.1.3 When the surface is finished by circumferential
mechanical polishing, the Ra measurement shall be measured
in the longitudinal direction. Roughness measurement of a
longitudinal mechanical polished surface shall be a matter of
agreement between the manufacturer and the purchaser.
13.3 Acceptance criteria for minor surface imperfections
shall be a matter for agreement by the manufacturer and the
purchaser.
13.4 Combinations of the above finishes for internal and
external surfaces may be specified. When tubes are polished on
one surface only, the other surface may be the regular mill
finish.
14. Product Marking
14.1 In addition to the marking prescribed in Specification
A 1016/A 1016M and specified in the order, the marking shall
include whether the tubing is seamless (SML), welded (WLD),
or heavily cold worked (HCW), and the surface finish.
15. Packaging
15.1 Unless otherwise specified in the order, all tubing shall
be protected for shipment by bundling, paper or burlap
wrapping, or boxing at the discretion of the manufacturer.
16. Keywords
16.1 austenitic stainless steel; duplex stainless steel; ferritic/
austenitic stainless steel; heavily cold worked tube; seamless
steel tube; stainless steel tube; steel tube; welded steel tube

SUPPLEMENTARY REQUIREMENTS

S1. Intergranular Corrosion Test
S1.1 When specified on the order, intergranular corrosion
tests shall be performed by the manufacturer on specimens
representative of the as-shipped condition. Tubes shall be
capable of passing corrosion tests in the as-shipped condition.
Tests shall be performed in accordance with Practice E of
Practices A 262 for austenitic stainless alloys (intergranular
corrosion test) or Practice C of Test Methods A 923 for duplex
alloys (S31803, S32205, or S32750, Intermetallic phase detection).
S2. Pharmaceutical Quality Tubing
S2.1 Chemistry:
S2.1.1 When S31600 and S31603 are ordered, sulfur content
shall be restricted to the range of 0.005 to 0.017 %.
S2.2 Tensile Requirements:
S2.2.1 The material shall conform to the tensile requirements
in Table S2.1.
S2.2.2 Tensile Test—One tension test shall be made on a
specimen of lots not more than 50 tubes. Tension tests shall be
made on specimens from two tubes for lots of more than 50
tubes (see Note S2.1).
S2.3 Hardness Requirements:
S2.3.1 The hardness shall meet the requirements in Table
S2.1.
S2.3.2 Rockwell hardness tests shall be made on specimens
from two tubes from each lot (see Note S2.1).
S2.4 Manipulation Tests:
S2.4.1 One flattening test shall be made on specimens from
each end of one finished tube, not the one used for the flange
test, from each lot (see Note S2.2).
S2.4.2 One flange test shall be made on specimens from
each end of one finished tube, not the one used for the
flattening test, from each lot (see Note S2.2).
S2.5 Finish:
S2.5.1 Requirements for surface finish shall be stated on the
purchase order.
S2.6 Packaging:
S2.6.1 Unless the customer specified otherwise, all tubing
shall be end capped, plastic sleeved, and boxed.
S2.7 Permissible Variations in Dimensions:
S2.7.1 The wall thickness shall not vary from the specified
wall thickness by more than 10 %.
S2.7.2 The cut length shall not vary over the specified
length by more than 2 in. (50.8 mm) or less than 0 in. (0 mm).

S3. Chemical Cleaning (Passivation)
S3.1 When specified on the purchase order, the tubing shall
be chemically cleaned in accordance with a chemical treatment
listed in Specification A 967 following the final polishing
operation. When tubing is supplied in an unpolished condition,
the cleaning shall be performed after the final finishing
operation.