ASTM A999/A999M-04a(2009)
(Specification)Standard Specification for General Requirements for Alloy and Stainless Steel Pipe
Standard Specification for General Requirements for Alloy and Stainless Steel Pipe
SCOPE
1.1 This specification covers a group of general requirements that, unless otherwise specified in an individual specification, shall apply to the ASTM product specifications noted below.
1.2 In the case of conflict between a requirement of a product specification and a requirement of this specification, the product specification shall prevail. In the case of conflict between a requirement of the product specification or a requirement of this specification and a more stringent requirement of the purchase order, the purchase order shall prevail.
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Designation: A999/A999M – 04a (Reapproved 2009)
Standard Specification for
General Requirements for Alloy and Stainless Steel Pipe
This standard is issued under the fixed designationA999/A999M; 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 SI units are shown in brackets. The values stated in each
2 systemarenotexactequivalents;thereforeeachsystemistobe
1.1 This specification covers a group of general require-
used independently of the other without combining values in
ments that, unless otherwise specified in an individual speci-
any way. The inch-pound units apply unless the “M” designa-
fication, shall apply to the ASTM product specifications noted
tion (SI) of the product specification is specified in the order.
below.
1.2 In the case of conflict between a requirement of a
NOTE 1—The dimensionless designator NPS (nominal pipe size) is
product specification and a requirement of this specification, used in this standard for such traditional terms as “nominal diameter,”
“size,” “ nominal bore,” and “nominal size.”
the product specification shall prevail. In the case of conflict
between a requirement of the product specification or a
1.4 The following precautionary statement pertains only to
requirement of this specification and a more stringent require-
the test method portion, Section 22, of this specification: This
ment of the purchase order, the purchase order shall prevail.
standard does not purport to address all of the safety concerns,
Title of Specification ASTM Desig-
if any, associated with its use. It is the responsibility of the user
nation
of this standard to establish appropriate safety and health
practices and determine the applicability of regulatory limita-
Seamless and Welded Austenitic Stainless Steel Pipes A312/A312M
Seamless and Welded Steel Pipe for Low-Temperature A333/A333M
tions prior to use.
Service
Seamless Ferritic Alloy-Steel Pipe for High Temperature A335/A335M
2. Referenced Documents
Service
Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy A358/A358M
2.1 ASTM Standards:
Steel Pipe for High-Temperature Service
A312/A312M Specification for Seamless, Welded, and
Carbon and Ferritic Alloy Steel Forged and Bored Pipe for A369/A369M
Heavily Cold Worked Austenitic Stainless Steel Pipes
High-Temperature Service
Seamless Austenitic Steel Pipe for Use With High A376/A376M
A333/A333M Specification for Seamless and Welded Steel
Temperature Central-Station Service
Pipe for Low-Temperature Service
Welded Large Diameter Austenitic Steel Pipe for Corrosive A409/A409M
A335/A335M Specification for Seamless Ferritic Alloy-
or High-Temperature Service
Welded, Unannealed Austenitic Stainless Steel Tubular A778
Steel Pipe for High-Temperature Service
Products
A358/A358M Specification for Electric-Fusion-Welded
Seamless and Welded Ferritic/Austenitic A790/A790M
Stainless Steel Pipe Austenitic Chromium-Nickel Stainless Steel Pipe for
Single- or Double-Welded Austenitic Stainless Steel Pipe A813/A813M
High-Temperature Service and General Applications
Cold-Worked Welded Austenitic Stainless Steel Pipe A814/A814M
A369/A369M Specification for Carbon and Ferritic Alloy
Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric A928/A928M
Fusion Welded with Addition of Filler Metal Steel Forged and Bored Pipe for High-Temperature Ser-
Spray-Formed Seamless Austenitic Stainless Steel Pipe A943/A943M
vice
Spray-Formed Seamless Ferritic/Austenitic Stainless Steel A949/A949M
A370 Test Methods and Definitions for Mechanical Testing
Pipe
Austenitic Chromium-Nickel-Silicon Alloy Steel Seamless A954
of Steel Products
and Welded Pipe
A376/A376M Specification for Seamless Austenitic Steel
Pipe for High-Temperature Central-Station Service
1.3 The values stated in either inch-pound units or SI units
A409/A409M Specification for Welded Large Diameter
are to be regarded separately as standard. Within the text, the
Austenitic Steel Pipe for Corrosive or High-Temperature
Service
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
A700 PracticesforPackaging,Marking,andLoadingMeth-
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.10 on Stainless and Alloy Steel Tubular Products. ods for Steel Products for Shipment
Current edition approved Oct. 1, 2009. Published February 2010. Originally
approved in 1998. Last previous edition approved in 2004 as A999/A999M–04a.
DOI: 10.1520/A0999_A0999M-04aR09.
2 4
For ASME Boiler and Pressure Vessel Code applications see related Specifi- For referenced ASTM standards, visit the ASTM website, www.astm.org, or
cation SA 999 in Section II of that Code. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
These designations refer to the latest issue of the respective specifications. See Standards volume information, refer to the standard’s Document Summary page on
Annual Book of ASTM Standards, Vol 01.01. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A999/A999M – 04a (2009)
A751 Test Methods, Practices, andTerminology for Chemi- SSPC-SP6 Surface Preparation Specification No. 6 Com-
cal Analysis of Steel Products mercial Blast Cleaning
A778 Specification for Welded, Unannealed Austenitic 2.6 ASNT Standards:
Stainless Steel Tubular Products SNT-TC-1A Recommended Practice for Personnel Qualifi-
A790/A790M Specification for Seamless and Welded cation and Certification in Nondestructive Testing
Ferritic/Austenitic Stainless Steel Pipe
3. Materials and Manufacture
A813/A813M Specification for Single- or Double-Welded
Austenitic Stainless Steel Pipe
3.1 The steel shall be made by a suitable steelmaking
A814/A814M Specification for Cold-Worked Welded Aus-
process.
tenitic Stainless Steel Pipe
3.2 If secondary melting, such as electroslag remelting or
A928/A928M Specification for Ferritic/Austenitic (Duplex)
vacuumremelting,isused,theheatshallbedefinedasallofthe
Stainless Steel Pipe Electric Fusion Welded withAddition
ingots remelted from a single primary heat.
of Filler Metal
3.3 If steels of different grades are sequentially strand cast,
A941 Terminology Relating to Steel, Stainless Steel, Re-
the resultant transition material shall be removed using an
lated Alloys, and Ferroalloys
established procedure that positively separates the grades.
A943/A943M Specification for Spray-Formed Seamless
3.4 If a specific type of melting is required by the purchaser,
Austenitic Stainless Steel Pipes
it shall be specified in the purchase order.
A949/A949M Specification for Spray-Formed Seamless
Ferritic/Austenitic Stainless Steel Pipe 4. Terminology
A954 Specification for Austenitic Chromium-Nickel-
4.1 Definitions:
Silicon Alloy Steel Seamless and Welded Pipe
4.1.1 The definitions in TerminologyA941, except as modi-
A994 Guide for Editorial Procedures and Form of Product
fied in this specification or in its referenced product specifica-
SpecificationsforSteel,StainlessSteel,andRelatedAlloys
tions, are applicable to this specification.
D3951 Practice for Commercial Packaging
E29 Practice for Using Significant Digits in Test Data to
5. Ordering Information
Determine Conformance with Specifications
5.1 It is the responsibility of the purchaser to specify all
E213 Practice for Ultrasonic Testing of Metal Pipe and
requirements that are necessary for products ordered under the
Tubing
applicable product specification and this general requirements
E273 Practice for Ultrasonic Examination of theWeld Zone
specification. Such requirements to be considered include, but
of Welded Pipe and Tubing
are not limited to, the following:
E309 Practice for Eddy-Current Examination of Steel Tu-
5.1.1 ASTM product specification and year-date,
bular Products Using Magnetic Saturation
5.1.2 Name of product (for example, stainless steel pipe),
E426 Practice for Electromagnetic (Eddy-Current) Exami-
5.1.3 Quantity (feet, metres, or number of pieces),
nation of Seamless and Welded Tubular Products, Austen-
5.1.4 Method of manufacture, where applicable (seamless
itic Stainless Steel and Similar Alloys
or welded),
E570 Practice for Flux Leakage Examination of Ferromag-
5.1.5 Specific type of melting, if required (see 3.4),
netic Steel Tubular Products
5.1.6 Grade or UNS number,
2.2 ANSI Standards:
5.1.7 Size (NPS and outside diameter and schedule number,
B36.10 Welded and Seamless Wrought Steel Pipe
average (nominal) wall thickness (see 9.1 and 10.1), or
B36.19 Stainless Steel Pipe
minimum wall thickness (see 9.2 and 10.1.1), or minimum
2.3 Military Standards:
inside diameter (see 11.1)),
MIL-STD-163 Steel Mill Products, Preparation for Ship-
5.1.8 Length (specific or random),
ment and Storage
5.1.9 End finish,
MIL-STD-271 Nondestructive Testing Requirements for
5.1.10 Optional requirements,
Metals
5.1.11 Certification (see Section 25),
MIL-STD-792 Identification Marking Requirements for
5.1.12 Specification designation and year of issue, and
Special Purpose Equipment
5.1.13 Special requirements or any supplementary require-
2.4 Federal Standard:
ments, or both.
Fed.Std.No.183 ContinuousIdentificationMarkingofIron
and Steel Products
6. Chemical Composition
2.5 Steel Structures Painting Council:
6.1 Chemical Analysis—Samples for chemical analysis and
method of analysis shall be in accordance with Test Methods,
Practices, and Terminology A751.
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org.
Portions of these standards appear in ASTM Book of Standards, Vol 01.01. Full
text of these standards is available from American National Standards Institute Available from Steel Structures Painting Council, 4400 Fifth Ave., Pittsburgh,
(ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org. PA 15213.
7 9
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700 AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
A999/A999M – 04a (2009)
6.2 Heat Analysis—An analysis of each heat of steel shall anylengthofseamlesspipeshallnotvarymorethan16 %over
bemadebythesteelmanufacturertodeterminethepercentages that calculated in accordance with 14.3. Unless otherwise
of the specified elements. If secondary melting processes are specified, the mass of pipe in sizes NPS 4 and smaller shall be
employed, the heat analysis shall be obtained from one determinedseparatelyorinconvenientlots;themassofpipein
remelted ingot or the product of one remelted ingot of each sizes larger than NPS 4 shall be determined separately.
primary melt. The chemical composition thus determined, or 9.3 The specified mass of pipe shall be determined by
that determined from a product analysis made by the tubular multiplying its specified or calculated mass per unit length (see
product manufacturer shall conform to the requirements speci- 14.3) by its measured length.
fied.
10. Permissible Variations in Wall Thickness
6.2.1 For steels ordered under product specifications refer-
encingthisspecificationofgeneralrequirements,thesteelshall
10.1 Seamless and Welded—Except as required by 10.1.1,
not contain an unspecified element, other than nitrogen for
theminimumwallthicknessatanypointshallnotbemorethan
stainless steels, for the ordered grade to the extent that the steel
12.5 % under the nominal wall thickness specified. The mini-
conforms to the requirements of another grade for which that
mum wall thickness on inspection is shown in Table X1.1.
element is a specified element having a required minimum
10.1.1 Minimum Wall—If the wall thickness of the pipe is
content. For this requirement, a grade is defined as an alloy
specified as minimum wall in the purchase order, there shall be
described individually and identified by its own UNS designa-
no variation under the specified wall thickness.
tion in a table of chemical requirements within any specifica-
10.2 Forged and Bored—The wall thickness shall not vary
tion listed within the scope as being covered by this specifi- 1
overthatspecifiedbymorethan ⁄8in.[3.2mm].Thereshallbe
cation.
no variation under the specified wall thickness.
6.3 Product Analysis—Product analysis requirements and
10.3 Cast—The wall thickness shall not vary over that
options, if any, shall be as contained in the applicable product 1
specified by more than ⁄16 in. [1.6 mm]. There shall be no
specification.
variation under the specified wall thickness.
7. Mechanical Properties
11. Permissible Variations in Inside Diameter
7.1 Method of Mechanical Tests—The specimens and me-
11.1 Forged and Bored, and Cast—The inside diameter
chanical tests required shall be in accordance with Test
shall not vary under that specified by more than ⁄16 in. [1.6
Methods and Definitions A370, especially Annex A2 thereof.
mm]. There shall be no variation over the specified inside
7.2 Specimens shall be tested at room temperature.
diameter.
7.3 Small or subsize specimens as described in Test Meth-
ods and Definitions A370 may be used only when there is
12. Permissible Variation in Outside Diameter
insufficient material to prepare one of the standard specimens.
12.1 Variations in outside diameter, unless otherwise agreed
When using small or subsize specimens, the largest one
upon, shall not exceed the limits given in Table 1. The
possible shall be used.
tolerances for outside diameter include ovality, except as
8. Tensile Requirements provided for in 12.2 and 12.2.1. (See Note 2.)
12.2 For thin-wall pipe, defined as pipe having a wall
8.1 The material shall conform to the requirements as to
thickness of 3 % or less of the specified outside diameter, the
tensile properties in the applicable product specification.
diameter tolerance of Table 1 is applicable only to the mean of
8.2 The yield strength, if specified, shall be determined
the extreme (maximum and minimum) outside diameter read-
correspondingtoapermanentoffsetof0.2 %ofthegagelength
ings in any one cross-section.
or to a total extension of 0.5 % of the gage length under load.
12.2.1 For thin-wall pipe, the difference in extreme outside
8.3 If the percentage of elongation of any test specimen is
readings (ovality) in any one cross-section shall not exceed
less than that specified and any part of the fracture is more than
1.5 % of the specified outside diameter.
⁄4 in. [19.0 mm] from the center of the gage length, as
indicated by scribe marks on the specimen before testing, a
NOTE 2—
...
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:A999/A999M–04a Designation: A999/A999M – 04a (Reapproved 2009)
Standard Specification for
General Requirements for Alloy and Stainless Steel Pipe
This standard is issued under the fixed designationA999/A999M; 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 *
1.1 This specification covers a group of general requirements that, unless otherwise specified in an individual specification,
shall apply to the ASTM product specifications noted below.
1.2 In the case of conflict between a requirement of a product specification and a requirement of this specification, the product
specification shall prevail. In the case of conflict between a requirement of the product specification or a requirement of this
specification and a more stringent requirement of the purchase order, the purchase order shall prevail.
Title of Specification ASTM Desig-
nation
Seamless and Welded Austenitic Stainless Steel Pipes A312/A312M
Seamless and Welded Steel Pipe for Low-Temperature A333/A333M
Service
Seamless Ferritic Alloy-Steel Pipe for High Temperature A335/A335M
Service
Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy A358/A358M
Steel Pipe for High-Temperature Service
Carbon and Ferritic Alloy Steel Forged and Bored Pipe for A369/A369M
High-Temperature Service
Seamless Austenitic Steel Pipe for Use With High A376/A376M
Temperature Central-Station Service
Welded Large Diameter Austenitic Steel Pipe for Corrosive A409/A409M
or High-Temperature Service
Welded, Unannealed Austenitic Stainless Steel Tubular A778
Products
Seamless and Welded Ferritic/Austenitic A790/A790M
Stainless Steel Pipe
Single- or Double-Welded Austenitic Stainless Steel Pipe A813/A813M
Cold-Worked Welded Austenitic Stainless Steel Pipe A814/A814M
Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric A928/A928M
Fusion Welded with Addition of Filler Metal
Spray-Formed Seamless Austenitic Stainless Steel Pipe A943/A943M
Spray-Formed Seamless Ferritic/Austenitic Stainless Steel A949/A949M
Pipe
Austenitic Chromium-Nickel-Silicon Alloy Steel Seamless A954
and Welded Pipe
1.3 Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunits
areshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;thereforeeachsystemistobeusedindependently
of the other without combining values in any way. The inch-pound units apply unless the “M” designation (SI) of the product
specification is specified in the order.
NOTE 1—The dimensionless designator NPS (nominal pipe size) is used in this standard for such traditional terms as “nominal diameter,” “size,” “
nominal bore,” and “nominal size.”
1.4 The following precautionary statement pertains only to the test method portion, Section 22, 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.
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel,Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.10 on Stainless and Alloy Steel Tubular Products.
Current edition approved JulyOct. 1, 2004.2009. Published August 2004.February 2010. Originally approved in 1998. Last previous edition approved in 2004 as
A999/A999M–04.A999/A999M–04a. DOI: 10.1520/A0999_A0999M-04AaR09.
For ASME Boiler and Pressure Vessel Code applications see related Specification SA 999 in Section II of that Code.
These designations refer to the latest issue of the respective specifications. See Annual Book of ASTM Standards, Vol 01.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A999/A999M – 04a (2009)
2. Referenced Documents
2.1 ASTM Standards:
A312/A312M Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
A333/A333M Specification for Seamless and Welded Steel Pipe for Low-Temperature Service
A335/A335M Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
A358/A358M Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-
Temperature Service and General Applications
A369/A369M Specification for Carbon and Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature Service
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A376/A376M Specification for Seamless Austenitic Steel Pipe for High-Temperature Central-Station Service
A409/A409M Specification for Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature Service
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
A778 Specification for Welded, Unannealed Austenitic Stainless Steel Tubular Products
A790/A790M Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
A813/A813M Specification for Single- or Double-Welded Austenitic Stainless Steel Pipe
A814/A814M Specification for Cold-Worked Welded Austenitic Stainless Steel Pipe
A928/A928M Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric FusionWelded withAddition of Filler
Metal
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
A943/A943M Specification for Spray-Formed Seamless Austenitic Stainless Steel Pipes
A949/A949M Specification for Spray-Formed Seamless Ferritic/Austenitic Stainless Steel Pipe
A954 Specification for Austenitic Chromium-Nickel-Silicon Alloy Steel Seamless and Welded Pipe A994
A994 Guide for Editorial Procedures and Form of Product Specifications for Steel, Stainless Steel, and Related Alloys
D3951 Practice for Commercial Packaging
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E213 Practice for Ultrasonic Testing of Metal Pipe and Tubing
E273 Practice for Ultrasonic Testing of the Weld Zone of Welded Pipe and Tubing
E309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
E426 Practice for Electromagnetic (Eddy-Current) Examination of Seamless andWeldedTubular Products,Austenitic Stainless
Steel and Similar Alloys
E570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
2.2 ANSI Standards:
B36.10 Welded and Seamless Wrought Steel Pipe
B36.19 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 Equipment
2.4 Federal Standard:
Fed. Std. No. 183 Continuous Identification Marking of Iron and Steel Products
2.5 Steel Structures Painting Council:
SSPC-SP6 Surface Preparation Specification No. 6 Commercial Blast Cleaning
2.6 ASNT Standards:
SNT-TC-1A Recommended Practice for Personnel Qualification and Certification in Nondestructive Testing
3. Materials and Manufacture
3.1 The steel shall be made by a suitable steelmaking process.
3.2 Ifsecondarymelting,suchaselectroslagremeltingorvacuumremelting,isused,theheatshallbedefinedasalloftheingots
remelted from a single primary heat.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
Portions of these standards appear in ASTM Book of Standards, Vol 01.01. Full text of these standards is available fromAmerican National Standards Institute, 11 West
42nd St., 13th floor, NewYork, NY10036., Vol 01.01. Full text of these standards is available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor,
New York, NY 10036, http://www.ansi.org.
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Available from Steel Structures Painting Council, 4400 Fifth Ave., Pittsburgh, PA 15213.
Available from American Society for Nondestructive Testing, 1711 Arlington Plaza, P.O. Box 28518, Columbus, OH 43228–0518.
Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
A999/A999M – 04a (2009)
3.3 If steels of different grades are sequentially strand cast, the resultant transition material shall be removed using an
established procedure that positively separates the grades.
3.4 If a specific type of melting is required by the purchaser, it shall be specified in the purchase order.
4. Terminology
4.1 Definitions:
4.1.1 The definitions in Terminology A941, except as modified in this specification or in its referenced product specifications,
are applicable to this specification.
5. Ordering Information
5.1 It is the responsibility of the purchaser to specify all requirements that are necessary for products ordered under the
applicable product specification and this general requirements specification. Such requirements to be considered include, but are
not limited to, the following:
5.1.1 ASTM product specification and year-date,
5.1.2 Name of product (for example, stainless steel pipe),
5.1.3 Quantity (feet, metres, or number of pieces),
5.1.4 Method of manufacture, where applicable (seamless or welded),
5.1.5 Specific type of melting, if required (see 3.4),
5.1.6 Grade or UNS number,
5.1.7 Size (NPS and outside diameter and schedule number, average (nominal) wall thickness (see 9.1 and 10.1), or minimum
wall thickness (see 9.2 and 10.1.1), or minimum inside diameter (see 11.1)),
5.1.8 Length (specific or random),
5.1.9 End finish,
5.1.10 Optional requirements,
5.1.11 Certification (see Section 25),
5.1.12 Specification designation and year of issue, and
5.1.13 Special requirements or any supplementary requirements, or both.
6. Chemical Composition
6.1 Chemical Analysis—Samples for chemical analysis and method of analysis shall be in accordance with Test Methods,
Practices, and Terminology A751.
6.2 Heat Analysis—An analysis of each heat of steel shall be made by the steel manufacturer to determine the percentages of
the specified elements. 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 the requirements specified.
6.2.1 For steels ordered under product specifications referencing this specification of general requirements, the steel shall not
contain an unspecified element, other than nitrogen for stainless steels, for the ordered grade to the extent that the steel conforms
to the 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.
6.3 Product Analysis—Product analysis requirements and options, if any, shall be as contained in the applicable product
specification.
7. Mechanical Properties
7.1 Method of Mechanical Tests—The specimens and mechanical tests required shall be in accordance with Test Methods and
Definitions A370, especially Annex A2 thereof.
7.2 Specimens shall be tested at room temperature.
7.3 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.
8. Tensile Requirements
8.1 The material shall conform to the requirements as to tensile properties in the applicable product specification.
8.2 The yield strength, if specified, shall be determined 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.
8.3 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.
9. Permissible Variation in Mass for Seamless Pipe
9.1 Except as allowed by 9.2, the mass of any length of seamless pipe in sizes NPS 12 and smaller shall not vary more than
A999/A999M – 04a (2009)
10 % over or more than 3.5 % under that specified. For pipe in sizes larger than NPS 12, the mass of any length of pipe shall not
vary more than 10 % over or more than 5 % under that specified. Unless otherwise specified, the mass of lengths of pipe in sizes
NPS 4 and smaller shall be determined separately or in convenient lots; the mass of lengths of pipe in sizes larger than NPS 4 shall
be determined separately.
9.2 Minimum Wall—If the wall thickness of the pipe is specified as minimum wall in the purchase order, the mass of any length
of seamless pipe shall not vary more than 16 % over that calculated in accordance with 14.3. Unless otherwise specified, the mass
of pipe in sizes NPS 4 and smaller shall be determined separately or in convenient lots; the mass of pipe in sizes larger than NPS
4 shall be determined separately.
9.3 The specified mass of pipe shall be determined by multiplying its specified or calculated mass per unit length (see 14.3) by
its measured length.
10. Permissible Variations in Wall Thickness
10.1 Seamless and Welded—Except as required by 10.1.1, the minimum wall thickness at any point shall not be more than
12.5 % under the nominal wall thickness specified. The minimum wall thickness on inspection is shown in Table X1.1.
10.1.1 Minimum Wall—If the wall thickness of the pipe is specified as minimum wall in the purchase order,
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