ASTM A381-96(2005)
(Specification)Standard Specification for Metal-Arc-Welded Steel Pipe for Use With High-Pressure Transmission Systems
Standard Specification for Metal-Arc-Welded Steel Pipe for Use With High-Pressure Transmission Systems
ABSTRACT
This specification covers metal-arc-welded steel pipe for use with high pressure transmission systems. The pipe is intended for fabrication of fittings and accessories for compressor or pump-station piping. The required chemical compositions for carbon steel, and the tensile properties of finished pipes are presented. Mechanical testing requirements namely transverse body tension test and transverse weld tension test shall be performed on each length of pipe from each lot of 100 lengths, and transverse guided-bend weld test cut from a length of pipe from each lot of 50 length, also hydrostatic test from each length of pipes shall be performed. A radiographic examination shall also be performed to ensure that the welding equipment is consistently producing the required quality.
SCOPE
1.1 This specification covers straight seam, double-submerged-arc-welded steel pipe (Note 1) suitable for high-pressure service, 16 in. (406 mm) and larger in outside diameter, with wall thicknesses from 5/16 to 1 1/2 in. (7.9 to 38 mm). The pipe is intended for fabrication of fittings and accessories for compressor or pump-station piping. Pipe ordered to this specification shall be suitable for bending, flanging (vastoning), corrugating, and similar operations.
Note 1-A comprehensive listing of standardized pipe dimensions is contained in ANSI B36.10.
Note 2-The term "double welded" is commonly used in the gas and oil transmission industry, for which this pipe is primarily intended, to indicate welding with at least two weld passes, of which one is on the outside of the pipe and one on the inside. For some sizes of the pipe covered by this specification, it becomes expedient to use manual welding, in which case the provisions of Note 3 shall be followed.
1.2 Nine classes of pipe, based on minimum yield point requirements, are covered as indicated in Table 1.
1.3 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.
1.4 The following hazard caveat applies to the test methods portion, Sections 9 and 10, only. This standard does not purport to address all of the safety problems, 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.
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Standards Content (Sample)
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Designation:A381 −96(Reapproved 2005)
Standard Specification for
Metal-Arc-Welded Steel Pipe for Use With High-Pressure
Transmission Systems
This standard is issued under the fixed designation A381; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
1.1 This specification covers straight seam, double-
A530/A530M Specification for General Requirements for
submerged-arc-welded steel pipe (Note 1) suitable for high-
Specialized Carbon and Alloy Steel Pipe
pressure service, 16 in. (406 mm) and larger in outside
E30 Test Methods for ChemicalAnalysis of Steel, Cast Iron,
5 1
diameter, with wall thicknesses from ⁄16 to 1 ⁄2 in. (7.9 to 38
Open-Hearth Iron, and Wrought Iron (Withdrawn 1995)
mm). The pipe is intended for fabrication of fittings and
2.2 ASME Boiler and Pressure Vessel Code:
accessories for compressor or pump-station piping. Pipe or-
Section VIII Pressure Vessels
dered to this specification shall be suitable for bending,
Section IX Welding Qualifications
flanging (vastoning), corrugating, and similar operations.
2.3 ANSI Standard:
NOTE 1—A comprehensive listing of standardized pipe dimensions is
ANSI B36.10 Welded and Seamless Wrought Steel Pipe
contained in ANSI B36.10.
NOTE 2—The term “double welded” is commonly used in the gas and
oil transmission industry, for which this pipe is primarily intended, to
3. Ordering Information
indicate welding with at least two weld passes, of which one is on the
3.1 Orders for material to this specification should include
outside of the pipe and one on the inside. For some sizes of the pipe
coveredbythisspecification,itbecomesexpedienttousemanualwelding, the following, as required, to describe the desired material
in which case the provisions of Note 3 shall be followed.
adequately:
3.1.1 Quantity (feet, centimetres, or number of lengths),
1.2 Nine classes of pipe, based on minimum yield point
3.1.2 Name of material (metal-arc welded pipe),
requirements, are covered as indicated in Table 1.
3.1.3 Class (Table 1),
1.3 The values stated in inch-pound units are to be regarded
3.1.4 Material (carbon or alloy steel, Section 5),
as standard. The values given in parentheses are mathematical
3.1.5 Size (outside diameter and wall thickness),
conversions to SI units that are provided for information only
3.1.6 Length (specific or random) (Section 13),
and are not considered standard.
3.1.7 Ends (Section 14),
1.4 The following caveat applies to the test methods
3.1.8 Heat treatment (stress-relieved or normalized) (see
portion, Sections 9 and 10, only. This standard does not
5.6),
purport to address all of the safety concerns, if any, associated
3.1.9 Optional requirements (see 5.2 (Note 3), Sections 11
with its use. It is the responsibility of the user of this standard
and 15),
to establish appropriate safety and health practices and
3.1.10 Specification number, and
determine the applicability of regulatory limitations prior to
3.1.11 Special requirements or exceptions to this specifica-
use.
tion.
2. Referenced Documents
4. General Requirements
2.1 ASTM Standards:
4.1 Material furnished to this specification shall conform to
the applicable requirements of the current edition of Specifi-
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
cation A530/A530M, unless otherwise provided herein.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.09 on Carbon Steel Tubular Products.
Current edition approved Oct. 1, 2005. Published October 2005. Originally
approved in 1954. Last previous edition approved in 2001 as A381 – 96 (2001). The last approved version of this historical standard is referenced on
DOI: 10.1520/A0381-96R05. www.astm.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American Society of Mechanical Engineers, 345 E. 47th St.,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM New York, NY 10017.
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A381−96 (2005)
TABLE 1 Tensile Requirements TABLE 2 Chemical Requirements for Carbon Steels on Product
Analysis
Class Yield Strength, Tensile Strength, Elongation in 2 in.
min, psi (MPa) min, psi (MPa) (50.8 mm),
Element Composition, %, max
min, %
Ladle Check
Carbon 0.26 0.30
Y 35 35 000 (240) 60 000 (415) 26
Manganese 1.40 1.50
Y 42 42 000 (290) 60 000 (415) 25
Phosphorus 0.025 0.030
Y 46 46 000 (316) 63 000 (435) 23
Sulfur 0.025 0.025
Y 48 48 000 (330) 62 000 (430) 21
Y 50 50 000 (345) 64 000 (440) 21
Y 52 52 000 (360) 66 000 (455) 20
Y 56 56 000 (385) 71 000 (490) 20
Y 60 60 000 (415) 75 000 (515) 20
6.4 For referee purposes, Test Methods E30 shall be used.
Y 65 65 000 (450) 77 000 (535) 20
7. Tensile Requirements
5. Materials and Manufacture
7.1 The tensile properties of transverse body-test specimens
taken from the finished pipe shall conform to the requirements
5.1 The steel plate used in the manufacture of the pipe shall
prescribed in Table 1. The tensile strength of the transverse
be of suitable welding quality carbon steel, or of suitable
weld-test specimens shall conform to that specified in Table 1.
welding quality high-strength, low-alloy steel, as agreed upon
between the manufacturer and purchaser.
7.2 Transverse body-test specimens shall be taken approxi-
mately opposite the weld; transverse weld-test specimens shall
5.2 The longitudinal edges of the plate shall be shaped to
be taken with the weld at the center of the specimen. For pipe
give the most satisfactory results by the particular welding
wall thicknesses up to ⁄4 in. (19 mm), incl, all transverse test
process employed.The plate shall be properly formed and may
specimens shall be approximately 1 ⁄2 in. (38 mm) wide in the
betackedpreparatorytowelding.Theweld(excepttackwelds)
gauge length and shall represent the full wall thickness of the
shall be made preferably by the automatic submerged-arc-
pipe from which the specimen was cut (see Fig. 23, Test
welding process (Note 3) and shall be of reasonably uniform
MethodsandDefinitionsA370).Forpipewithwallthicknesses
width and height for the entire length of the pipe.
over ⁄4 in. (19 mm), the standard 0.505-in. (12.83-mm) round
NOTE 3—By agreement between the manufacturer and the purchaser,
tension test specimen with 2-in. (50.8-mm) gauge length shall
manual welding by qualified welders using a qualified procedure may be
be used (see Fig. 5, Test Methods and Definitions A370).
used as an equal alternate to this specification.
7.3 If the tension test specimen from any lot of pipe fails to
5.3 Both longitudinal and circumferential (if any) joints
conform to the requirements for the particular grade of pipe
shall be double welded, full penetration welds being made in
ordered, the manufacturer may elect to make retests on two
accordance with procedures and by welders or welding opera-
additional lengths of pipe from the same lot, each of which
tors qualified in accordance with the ASME Boiler and
shall conform to the requirements prescribed in Table 2.Ifone
Pressure Vessel Code, Section IX.
or both of the retests fail to conform to the requirements, the
5.4 The contour of the reinforcement shall be smooth, with
manufacturer may elect to test each of the remaining lengths of
no valley or groove along the edge or in the center of the weld,
pipe in the lot. Retests are required only for the particular test
and the deposited metal shall be fused smoothly and uniformly
with which the pipe specimen did not comply originally.
into the plate surface. The finish of the welded joint shall be
7.4 All test specimens which are flattened cold may be
reasonably smooth and free from irregularities, grooves, or
reheat treated before machining.
depressions.
5.5 All pipe, after welding, shall be heat treated at a
8. Transverse Guided-Bend Tests Weld
temperature of 1100°F (593°C) or higher.
8.1 Transverse weld test specimens shall be subject to face
5.6 When specified in the purchase order, all pipe after
and root guided-bend tests. The specimens shall be approxi-
welding shall be heated at 1650 to 1750°F (899 to 954°C) and
mately 1 ⁄2 in. (38.1 mm) wide, at least 6 in. (152 mm) in
air cooled.
length with the weld at the center, and shall be machined in
accordance with Fig. 1. One specimen shall be bent with the
6. Chemical Composition
inside surface of the pipe against the plunger, and the other
6.1 The carbon steels shall conform to the requirements as
specimen with the outside surface against the plunger. The
to chemical composition specified in Table 2.
dimensions of the plunger for the bending jig shall be in
6.2 The high-strength low-alloy steels shall be of specified accordance with Fig. 2 and the other dimensions shall be
chemical composition in order to ensure weldability and substantially as shown in Fig. 2.
specified minimum tensile properties including elongation.
8.2 The bend test shall be acceptable if no cracks or other
6.3 Mill test reports, as provided by the manufacturer of the defects exceeding ⁄8 in. (3.17 mm) in any direction are present
plate, shall be furnished representing the chemical analysis of in the weld metal or between the weld and pipe metal after
each h
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