ASTM A530/A530M-04a(2010)
(Specification)Standard Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
Standard Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
ABSTRACT
This specification covers a general requirements for specialized carbon and alloy steel pipe. Tensile tests, tension tests, flattening tests, hydrostatic tests and ultrasonic tests shall be made to conform to the requirements specified. If the mechanical results do not conform to the requirements specified, retests shall be made. Defects in seamless pipe shall be repaired by welding.
SCOPE
1.1 This specification covers a group of requirements which, with the exceptions of Section 5.3, Section 13, Section 20, and Section 21, are mandatory requirements to the ASTM pipe product specifications noted below unless the product specification specifies different requirements, in which case the requirement of the product specification shall prevail.
1.2 Sections 5.3 or 20 are mandatory if the product specification has a requirement for product analysis or flattening tests.
1.3 Section 21 is mandatory if the product specification has a hydrostatic test requirement without defining the test parameters.
1.4 Section 13 is for information only.
1.5 In case of conflict between a requirement of the product specification and a requirement of this general requirement specification, only the requirement of the product specification need be satisfied.
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Designation: A530/A530M – 04a (Reapproved 2010)
Standard Specification for
General Requirements for Specialized Carbon and Alloy
Steel Pipe
This standard is issued under the fixed designationA530/A530M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
Carbon and Alloy Steel Pipe, Electric-Fusion-Welded A691
for High-Pressure Service at High Temperatures
1.1 This specification covers a group of requirements
Centrifugally Cast Ferritic/Austenitic Stainless Steel A872
which, with the exceptions of Section 5.3, Section 13, Section
Pipe for Corrosive Environments
20, and Section 21, are mandatory requirements to the ASTM
A
These designations refer to the latest issue of the respective specifications.
pipe product specifications noted below unless the product
1.6 The values stated in either inch-pound units or SI units
specification specifies different requirements, in which case the
are to be regarded separately as standard. Within the text, the
requirement of the product specification shall prevail.
SI units are shown in brackets. The values stated in each
1.2 Sections 5.3 or 20 are mandatory if the product speci-
system are not exact equivalents; therefore, each system must
fication has a requirement for product analysis or flattening
be used independently of the other. Combining values from the
tests.
two systems may result in nonconformance with the specifi-
1.3 Section 21 is mandatory if the product specification has
cation. The inch-pound units shall apply unless the “M”
a hydrostatic test requirement without defining the test param-
designation (SI) of the product specification is specified in the
eters.
order.
1.4 Section 13 is for information only.
NOTE 1—The dimensionless designator NPS (nominal pipe size) has
1.5 In case of conflict between a requirement of the product
been substituted in this standard for such traditional terms as “nominal
specification and a requirement of this general requirement
diameter,” “size,” and “nominal size.”
specification, only the requirement of the product specification
1.7 This standard does not purport to address all of the
need be satisfied.
A safety concerns, if any, associated with its use. It is the
Title of Specification ASTM Designation
responsibility of the user of this standard to establish appro-
Seamless Carbon Steel Pipe for High-Temperature A106
priate safety and health practices and determine the applica-
Service
bility of regulatory limitations prior to use.
Metal-Arc-Welded Steel Pipe for Use With High- A381
Pressure Transmission Systems
Centrifugally Cast Ferritic Alloy Steel Pipe for High- A426 2. Referenced Documents
Temperature Service
2.1 ASTM Standards:
Centrifugally Cast Austenitic Steel Pipe for High- A451
Temperature Service
A370 Test Methods and Definitions for Mechanical Testing
Seamless Carbon Steel Pipe for Atmospheric and A524
of Steel Products
Lower Temperatures
A450/A450M Specification for General Requirements for
Centrifugally Cast Iron-Chromium-Nickel High-Alloy A608
Tubing for Pressure Application at High
Carbon and Low Alloy Steel Tubes
Temperatures
A700 PracticesforPackaging,Marking,andLoadingMeth-
Centrifugally Cast Carbon Steel Pipe for High- A660
ods for Steel Products for Shipment
Temperature Service
Electric-Fusion-Welded Steel Pipe for Atmospheric A671
A751 Test Methods, Practices, andTerminology for Chemi-
and Lower Temperatures
cal Analysis of Steel Products
Electric-Fusion-Welded Steel Pipe for High-Pressure A672
A941 Terminology Relating to Steel, Stainless Steel, Re-
Service at Moderate Temperatures
lated Alloys, and Ferroalloys
D3951 Practice for Commercial Packaging
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
E29 Practice for Using Significant Digits in Test Data to
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.09 on Carbon Steel Tubular Products.
Current edition approved April 1, 2010. Published August 2010. Originally
approved in 1965. Last previous edition approved in 2004 as A530/A530M–04a. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/A0530_A0530M-04AR10. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
For ASME Boiler and Pressure Vessel Code applications see related Specifi- Standards volume information, refer to the standard’s Document Summary page on
cation SA-530 in Section II of that Code. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A530/A530M – 04a (2010)
Determine Conformance with Specifications tion to be fully assessed, the manufacturer may complete the
2.2 ANSI Standards: assessment of conformance with such heat analysis require-
B 36.10 Welded and Seamless Wrought Steel Pipe ments by using a product analysis for the specified elements
B 36.19 Stainless Steel Pipe that were not reported by the steel producer, provided that
2.3 Military Standards: product analysis tolerances are not applied and the heat
MIL-STD-163 Steel Mill Products Preparation for Ship- analysis is not altered.
ment and Storage 5.2.1 For stainless steels ordered under product specifica-
MIL-STD-271 Nondestructive Testing Requirements for tions referencing this specification of general requirements, the
Metals steel shall not contain an unspecified element, other than
MIL-STD-792 Identification Marking Requirements for nitrogen, for the ordered grade to the extent that the steel
Special Purpose Components conforms to the requirements of another grade for which that
2.4 Federal Standards: element is a specified element having a required minimum
Fed.Std.No.183 ContinuousIdentificationMarkingofIron content. For this requirement, a grade is defined as an alloy
and Steel Products described individually and identified by its own UNS designa-
2.5 Steel Structures Painting Council: tion in a table of chemical requirements within any specifica-
SSPC-SP 6 Surface Preparation Specification No. 6 Com- tion listed within the scope as being covered by this specifi-
mercial Blast Cleaning cation.
5.3 Product Analysis—Product analysis requirements and
3. Terminology
options, if any, are contained in the product specification.
3.1 Definitions of Terms Specific to This Standard:
6. Mechanical Requirements
3.1.1 remelted heat, n—in secondary melting, all of the
6.1 Method of Mechanical Tests—The specimens and the
ingots remelted from a single primary heat.
mechanical tests required shall be in accordance with Test
3.1.2 jointer, n—a length of pipe created by welding two or
Methods and Definitions A370, especially Annex A2 thereof.
more shorter lengths of pipe, end-to-end.
6.2 Specimens shall be tested at room temperature.
3.1.3 thin-wall pipe, n—a pipe having a wall thickness of
6.3 Small or subsize specimens as described in Test Meth-
3 % or less of the outside diameter.
ods and Definitions A370 may be used only when there is
3.2 Other defined terms—The definitions in Test Methods
insufficient material to prepare one of the standard specimens.
and Definitions A370, Test Methods, Practices, and Terminol-
When using small or subsize specimens, the largest one
ogy A751, and Terminology A941 are applicable to this
possible shall be used.
specification and to those listed in 1.5.
7. Tensile Requirements
4. Process
7.1 The material shall conform to the requirements as to
4.1 The steel shall be made from any process.
tensile properties prescribed in the individual specifications.
4.2 If a specific type of melting is required by the purchaser,
7.2 The yield strength corresponding to a permanent offset
it shall be stated on the purchase order.
of 0.2 % of the gage length or to a total extension of 0.5 % of
4.3 The primary melting may incorporate separate degas-
the gage length under load shall be determined.
sing or refining and may be followed by secondary melting,
7.3 If the percentage of elongation of any test specimen is
using electroslag remelting or vacuum remelting.
less than that specified and any part of the fracture is more than
4.4 Steel may be cast in ingots or may be strand cast. When
⁄4 in. [19.0 mm] from the center of the gage length, as
steel of different grades is sequentially strand cast, identifica-
indicated by scribe marks on the specimen before testing, a
tion of the resultant transition material is required. The
retest shall be allowed.
producer shall remove the transition material by an established
procedure that positively separates the grades.
8. Permissible Variation in Weight
8.1 TheweightofanylengthofpipeNPS12andundershall
5. Chemical Composition
not vary more than 10 % over or 3.5 % under that specified.
5.1 Chemical Analysis—Samples for chemical analysis and
For sizes over NPS 12, the weight of any length of pipe shall
method of analysis shall be in accordance with Test Methods,
not vary more than 10 % over or 5 % under that specified.
Practices, and Terminology A751.
Unless otherwise specified, pipe of NPS 4 and smaller may be
5.2 Heat Analysis—If the heat analysis reported by the steel
weighed in convenient lots; pipe in sizes larger than NPS 4
producer is not sufficiently complete for conformance with the
shall be weighed separately.
heat analysis requirements of the applicable product specifica-
9. Permissible Variations in Wall Thickness
4 9.1 Seamless and Welded (no filler metal added)—The
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
minimum wall thickness at any point shall be within the
4th Floor, New York, NY 10036, http://www.ansi.org.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
tolerances specified inTable 1 , except that for welded pipe the
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
weld area shall not be limited by the over tolerance. The
dodssp.daps.dla.mil.
minimum wall thickness on inspection for – 12.5 % is shown
Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,
Pittsburgh, PA 15222-4656, http://www.sspc.org. in Table X1.1.
A530/A530M – 04a (2010)
TABLE 1 Permissible Variations in Wall Thickness
12.2 Forged and Bored, Cast, and Cast Cold-Wrought—If
definite cut lengths are ordered, no length of pipe shall be
NPS Designator Tolerance, % from
underthelengthspecifiedandnotmorethan ⁄8in.[3mm]over
Nominal
that specified.
Over Under
12.3 For pipe ordered to random lengths, the lengths and
A,B
1 1
variations shall be agreed upon between the manufacturer and
⁄8 to 2 ⁄2 , incl., all t /D ratios 20.0 12.5
3to18incl., t /D up to 5 % incl. 22.5 12.5
purchaser.
3to18incl., t /D > 5 % 15.0 12.5
12.4 No jointers are permitted unless otherwise agreed
20 and larger, welded, all t /D ratios 17.5 12.5
upon.
20 and larger, seamless, t /D up to 22.5 12.5
5 % incl.
20 and larger, seamless, t /D > 5 % 15.0 12.5 13. Standard Weight
A
t = Nominal wall thickness.
13.1 A system of standard pipe sizes has been approved by
B
D = Ordered outside diameter.
the American National Standards Institute as ANSI B 36.10
and B 36.19. These standard sizes do not prohibit the produc-
9.2 Forged and Bored—The wall thickness shall not vary
tion and use of other sizes of pipe produced to the various
over that specified by more than ⁄8 in. [3.2 mm]. There shall specifications referenced to this Specification.
be no variation under the specified wall thickness. 13.2 For nonstandard sizes of pipe, the calculated weight
9.3 Cast—The wall thickness shall not vary over that per foot, shall be determined from the following equation:
specified by more than ⁄16 in. [1.6 mm]. There shall be no
W 5 C~D 2 t!t (1)
variation under the specified wall thickness.
where:
10. Permissible Variations in Inside Diameter
C = 10.69 [0.0246615],
W = weight, lb/ft [kg/m],
10.1 Forged and Bored, and Cast—The inside diameter
1 D = specified or calculated (from specified inside diameter
shall not vary under that specified by more than ⁄16 in. [1.6
and wall thickness) outside diameter, in. [mm], and
mm]. There shall be no variation over the specified inside
t = specified wall thickness, in. (to 3 decimal places) [mm
diameter.
to 2 decimal places].
11. Permissible Variations in Outside Diameter
NOTE 2—The weights given in the American National Standards and
the calculated weights given by Eq 1 are based on the weights for carbon
11.1 Variations in outside diameter, unless otherwise speci-
steel pipe. The weight of pipe made of ferritic stainless steels may be
fied, shall not exceed the limits prescribed in Table 2. The
about 5 % less, and that made of austenitic stainless steel about 2 %
tolerances on outside diameter include ovality except as
greater than the values given.
provided for in 11.2
11.2 Thin-wall pipe usually develops significant ovality
14. Ends
(out-of-roundness) during final annealing, straightening, or
14.1 Unless otherwise specified, the pipe shall be furnished
both. The diameter tolerances of Table 2 are not sufficient to
with plain ends. All burrs at the ends of the pipe shall be
provide for additional ovality expected in thin-wall pipe and
removed.
are applicable only to the mean of the extreme (maximum and
minimum) outside diameter readings in any one cross-section. 15. Straightness
However, for thin-wall pipe the difference in extreme outside
15.1 The finished pipe shall be reasonably straight.
diameter readings (ovality) in any one cross-section shall not
15.2 For metal-arc welded pipe, the maximum deviation
exceed 1.5 % of the specified outside diameter.
from a 10-ft [3.0-m] straightedge placed so that both ends are
in contact with the pipe shall be ⁄8 in. [3.2 mm]. For metal-arc
12. Permissible Variations in Length
welded pipe with lengths shorter than 10 ft [3.0 m], this
12.1 Seamless and Welded (no filler metal added)—If defi-
maximum deviation shall be pro-rated with respect to the ratio
nitecutlengthsareordered,nolengthofpipeshallbeunderthe
of the actual length to 10 ft [3.0 m].
length specified and not more than ⁄4 in. [6 mm] over that
16. Repair by Welding
specified.
16.1 Repair by welding of defects in seamless pipe (includ-
ing centrifugally cast and forged and bored) and of plate
TABLE 2 Permissible Variations in Outside Diameter
defects in welded pipe and, when specifically stated by the
NPS Designator Permissible Variations In Outside Diameter
product specification weld seam defects in welded pipe, shall
Over Under
be permitted subject to the approval
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:A530/A530M–04a Designation: A530/A530M – 04a (Reapproved 2010)
Standard Specification for
General Requirements for Specialized Carbon and Alloy
Steel Pipe
This standard is issued under the fixed designationA530/A530M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope *
1.1 This specification covers a group of requirements which, with the exceptions of Section 5.3, Section 13, Section 20, and
Section 21, are mandatory requirements to the ASTM pipe product specifications noted below unless the product specification
specifies different requirements, in which case the requirement of the product specification shall prevail.
1.2 Sections 5.3 or 20 are mandatory if the product specification has a requirement for product analysis or flattening tests.
1.3 Section 21 is mandatory if the product specification has a hydrostatic test requirement without defining the test parameters.
1.4 Section 13 is for information only.
1.5 In case of conflict between a requirement of the product specification and a requirement of this general requirement
specification, only the requirement of the product specification need be satisfied.
A
Title of Specification ASTM Designation
Seamless Carbon Steel Pipe for High-Temperature A106
Service
Metal-Arc-Welded Steel Pipe for Use With High- A381
Pressure Transmission Systems
Centrifugally Cast Ferritic Alloy Steel Pipe for High- A426
Temperature Service
Centrifugally Cast Austenitic Steel Pipe for High- A451
Temperature Service
Seamless Carbon Steel Pipe for Atmospheric and A524
Lower Temperatures
Centrifugally Cast Iron-Chromium-Nickel High-Alloy A608
Tubing for Pressure Application at High
Temperatures
Centrifugally Cast Carbon Steel Pipe for High- A660
Temperature Service
Electric-Fusion-Welded Steel Pipe for Atmospheric A671
and Lower Temperatures
Electric-Fusion-Welded Steel Pipe for High-Pressure A672
Service at Moderate Temperatures
Carbon and Alloy Steel Pipe, Electric-Fusion-Welded A691
for High-Pressure Service at High Temperatures
Centrifugally Cast Ferritic/Austenitic Stainless Steel A872
Pipe for Corrosive Environments
A
These designations refer to the latest issue of the respective specifications.
1.6 Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunits
are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used
independently of the other. Combining values from the two systems may result in nonconformance with the specification. The
inch-pound units shall apply unless the “M” designation (SI) of the product specification is specified in the order.
NOTE 1—The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,”
“size,” and “nominal size.”
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of SubcommitteeA01.09
on Carbon Steel Tubular Products.
Current edition approved Oct.April 1, 2004.2010. Published October 2004.August 2010. Originally approved in 1965. Last previous edition approved in 2004 as
A530/A530M–04.A530/A530M–04a. DOI: 10.1520/A0530_A0530M-04AR10.
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-530 in Section II of that Code.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A530/A530M – 04a (2010)
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:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A450/A450M Specification for General Requirements for Carbon and Low Alloy Steel Tubes
A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
D3951 Practice for Commercial Packaging
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
2.2 ANSI Standards:
B 36.10 Welded and Seamless Wrought Steel Pipe
B 36.19 Stainless Steel Pipe
2.3 Military Standards:
MIL-STD-163 Steel Mill Products Preparation for Shipment and Storage
MIL-STD-271 Nondestructive Testing Requirements for Metals
MIL-STD-792 Identification Marking Requirements for Special Purpose Components
2.4 Federal Standards:
Fed. Std. No. 183 Continuous Identification Marking of Iron and Steel Products
2.5 Steel Structures Painting Council:
SSPC-SP 6 Surface Preparation Specification No. 6 Commercial Blast Cleaning
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 remelted heat, n—in secondary melting, all of the ingots remelted from a single primary heat.
3.1.2 jointer, n—a length of pipe created by welding two or more shorter lengths of pipe, end-to-end.
3.1.3 thin-wall pipe, n—a pipe having a wall thickness of 3 % or less of the outside diameter.
3.2 Other defined terms—The definitions in Test Methods and Definitions A370, Test Methods, Practices, and Terminology
A751, and Terminology A941 are applicable to this specification and to those listed in 1.5.
4. Process
4.1 The steel shall be made from 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, using
electroslag remelting or vacuum remelting.
4.4 Steel may be cast in ingots or may be strand cast. When steel of different grades is 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. Chemical Composition
5.1 Chemical Analysis—Samples for chemical analysis and method of analysis shall be in accordance with Test Methods,
Practices, and Terminology A751.
5.2 Heat Analysis—If the heat analysis reported by the steel producer is not sufficiently complete for conformance with the heat
analysis requirements of the applicable product specification to be fully assessed, the manufacturer may complete the assessment
of conformance with such heat analysis requirements by using a product analysis for the specified elements that were not reported
by the steel producer, provided that product analysis tolerances are not applied and the heat analysis is not altered.
5.2.1 For stainless steels ordered under product specifications referencing this specification of general requirements, the steel
shall not contain an unspecified element, other than nitrogen, for the ordered grade to the extent that the steel conforms to the
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
Standardsvolume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American National Standards Institute, 11 West 42nd St., 13th Floor, New York, NY 10036.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.19111-5098,
http://dodssp.daps.dla.mil.
Available from Steel Structures Painting Council, 4400 Fifth Ave., Pittsburgh, PA 15213.
Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor, Pittsburgh, PA 15222-4656, http://www.sspc.org.
A530/A530M – 04a (2010)
requirements of another grade for which that element is a specified element having a required minimum content. For this
requirement, a grade is defined as an alloy described individually and identified by its own UNS designation in a table of chemical
requirements within any specification listed within the scope as being covered by this specification.
5.3 Product Analysis—Product analysis requirements and options, if any, are contained in the product specification.
6.Mechanical Requirements Mechanical Requirements
6. Mechanical Requirements
6.1 Method of Mechanical Tests—The specimens and the mechanical tests required shall be in accordance with Test Methods
and Definitions A370, especially Annex A2 thereof.
6.2 Specimens shall be tested at room temperature.
6.3 Small or subsize specimens as described in Test Methods and DefinitionsA370 may be used only when there is insufficient
material to prepare one of the standard specimens. When using small or subsize specimens, the largest one possible shall be used.
7. Tensile Requirements
7.1 The material shall conform to the requirements as to tensile properties prescribed in the individual specifications.
7.2 The yield strength corresponding to a permanent offset of 0.2 % of the gage length or to a total extension of 0.5 % of the
gage length under load shall be determined.
7.3 If the percentage of elongation of any test specimen is less than that specified and any part of the fracture is more than ⁄4
in. [19.0 mm] from the center of the gage length, as indicated by scribe marks on the specimen before testing, a retest shall be
allowed.
8. Permissible Variation in Weight
8.1 The weight of any length of pipe NPS 12 and under shall not vary more than 10 % over or 3.5 % under that specified. For
sizes over NPS 12, the weight of any length of pipe shall not vary more than 10 % over or 5 % under that specified. Unless
otherwisespecified,pipeofNPS4andsmallermaybeweighedinconvenientlots;pipeinsizeslargerthanNPS4shallbeweighed
separately.
9. Permissible Variations in Wall Thickness
9.1 Seamless and Welded (no filler metal added)—The minimum wall thickness at any point shall be within the tolerances
specified in Table 1 , except that for welded pipe the weld area shall not be limited by the over tolerance. The minimum wall
thickness on inspection for – 12.5 % is shown in Table X1.1.
9.2 Forged and Bored—The wall thickness shall not vary over that specified by more than ⁄8 in. [3.2 mm]. There shall be no
variation under the specified wall thickness.
9.3 Cast—Thewallthicknessshallnotvaryoverthatspecifiedbymorethan ⁄16 in.[1.6mm].Thereshallbenovariationunder
the specified wall thickness.
10. Permissible Variations in Inside Diameter
10.1 Forged and Bored, and Cast—The inside diameter shall not vary under that specified by more than ⁄16 in. [1.6 mm].There
shall be no variation over the specified inside diameter.
11. Permissible Variations in Outside Diameter
11.1 Variations in outside diameter, unless otherwise specified, shall not exceed the limits prescribed in Table 2. The tolerances
on outside diameter include ovality except as provided for in 11.2
11.2 Thin-wall pipe usually develops significant ovality (out-of-roundness) during final annealing, straightening, or both. The
diameter tolerances ofTable 2 are not sufficient to provide for additional ovality expected in thin-wall pipe and are applicable only
TABLE 1 Permissible Variations in Wall Thickness
NPS Designator Tolerance, % from
Nominal
Over Under
A,B
1 1
⁄8 to 2 ⁄2 , incl., all t /D ratios 20.0 12.5
3to18incl., t /D up to 5 % incl. 22.5 12.5
3to18incl., t /D > 5 % 15.0 12.5
20 and larger, welded, all t /D ratios 17.5 12.5
20 and larger, seamless, t /D up to 22.5 12.5
5 % incl.
20 and larger, seamless, t /D > 5 % 15.0 12.5
A
t = Nominal wall thickness.
B
D = Ordered outside diameter.
A530/A530M – 04a (2010)
TABLE 2 Permissible Variations in Outside Diameter
NPS Designator Permissible Variations In Outside Diameter
Over Under
in. mm in. mm
1 1 1 1
⁄8 to 1 ⁄2 , incl ⁄64 (0.015) 0.4 ⁄32 (0.031) 0.8
1 1 1
Over 1 ⁄2 to 4, incl ⁄32 (0.031) 0.8 ⁄32 (0.031) 0.8
1 1
Over 4 to 8, incl ⁄16 (0.062) 1.6 ⁄32 (0.031) 0.8
3 1
Over 8 to 18, incl ⁄32 (0.093) 2.4 ⁄32 (0.031) 0.8
1 1
Over 18 to 26, incl ⁄8 (0.125) 3.2 ⁄32 (0.031) 0.8
5 1
Over 26 to 34, incl ⁄32 (0.156) 4.0 ⁄32 (0.031) 0.8
3 1
Over 34 ⁄16 (0.187) 4.8 ⁄32 (0.031) 0.8
to the mean of the extreme (maximum and minimum) outside diameter readings in any one cross-section. However, for thin-wall
pipe the difference in extreme outside diameter readings (ovality) in any one cross-section shall not exceed 1.5 % of the specified
outside diameter.
12. Permissible Variations in Length
12.1 Seamless and Welded (no filler metal added)—Ifdefinitecutlengthsareordered,nolengthofpipeshallbeunderthelength
specified and not more than ⁄4 in. [6 mm] over that specified.
12.2 Forged and Bored, Cast, and Cast Cold-Wrought—If definite cut lengths are ordered, no length of pipe shall be under the
length specified and not more than ⁄8 in. [3 mm] over that specified.
12.3 For pipe ordered to random lengths, the lengths and variations shall be agreed upon between the manufacturer and
purchaser.
12.4 No jointers are permitted unless otherwise agreed upon.
13. Standard Weight
13.1 A system of standard pipe sizes has been approved by the American National Standards Institute as ANSI B 36.10 and
B 36.19. These standard sizes do not prohibit the production and use of other sizes of pipe produced to the various specifications
referenced to this Specification.
13.2 For nonstandard sizes of pipe, the calculated weight per foot, shall be determined from the following equation:
W 5 C~D 2 t!t (1)
A0530_A0530M-04AR10_1
where:
C = 10.69 [0.0246615],
W = weight, lb/ft [kg/m],
D = specified or calculated (from specified inside diameter and wall thickness) outside diameter, in. [mm], and
t = specified wall thickness, in. (to 3 decimal places) [mm to 2 decimal places].
NOTE 2—The weights given in the American National Standards and the calculated weights given by Eq 1 are based on the weights f
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