ASTM A524-96(2005)

Standard Specification for Seamless Carbon Steel Pipe for Atmospheric and Lower Temperatures

ABSTRACT
This specification covers seamless carbon steel pipe intended primarily service at atmospheric and lower temperatures. The steel shall be killed steel made by one or more of the following processes: open-hearth, electric-furnace, or basic-oxygen. The steel shall be made to fine grain practice and may be cast in ingots or may be strand cast. All hot-finished and cold-drawn pipe shall be heat treated and be cooled in air or in the cooling chamber of a controlled atmosphere furnace. The steel shall be subjected to flattening, hydrostatic, bend, and tensile tests. A retest shall be conducted if a specimen breaks in an inside or outside surface flaw.
SCOPE
1.1 This specification  covers seamless carbon steel pipe intended primarily for service at atmospheric and lower temperatures, NPS 1/8 to 26 inclusive, with nominal (average) wall thickness as given in ANSI B36.10. Pipe having other dimensions may be furnished, provided such pipe complies with all other requirements of this specification. Pipe ordered to this specification shall be suitable both for welding, and for bending, flanging, and similar forming operations.  
1.2 The values stated in inch-pound units are to be regarded as the standard.
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".
1.3 The following hazard caveat applies to the test methods portion, Section 16, 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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2005
• ICS: 23.040.10 - Iron and steel pipes
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.09 - Carbon Steel Tubular Products

Relations

• Replaces: ASTM A524-96(2001) - Standard Specification for Seamless Carbon Steel Pipe for Atmospheric and Lower Temperatures
• Effective Date: 01-Oct-2005
• Replaced By: ASTM A524-96(2012) - Standard Specification for Seamless Carbon Steel Pipe for Atmospheric and Lower Temperatures
• Effective Date: 01-Mar-2012
• Referred By: ASTM A530/A530M-18 - Standard Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
• Effective Date: 01-Oct-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:A524 −96(Reapproved 2005)
Standard Specification for
Seamless Carbon Steel Pipe for Atmospheric and Lower
Temperatures
This standard is issued under the fixed designation A524; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 American National Standards Institute Standard:
B36.10Welded and Seamless Wrought Steel Pipe
1.1 This specification covers seamless carbon steel pipe
intended primarily for service at atmospheric and lower
3. Ordering Information
temperatures, NPS ⁄8 to 26 inclusive, with nominal (average)
3.1 Orders for material under this specification should
wall thickness as given in ANSI B36.10. Pipe having other
include the following, as required, to describe the desired
dimensions may be furnished, provided such pipe complies
material adequately:
with all other requirements of this specification. Pipe ordered
3.1.1 Quantity (feet or number of lengths),
to this specification shall be suitable both for welding, and for
3.1.2 Name of material (seamless carbon steel pipe),
bending, flanging, and similar forming operations.
3.1.3 Grade (Table 1 and Table 2),
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
3.1.4 Manufacture (hot finished or cold drawn),
as standard. The values given in parentheses are mathematical
3.1.5 Size(eithernominalwallthicknessandweightclassor
conversions to SI units that are provided for information only
schedule number, or both, or outside diameter and nominal
and are not considered standard.
wall thickness, ANSI B36.10),
3.1.6 Length (17),
NOTE 1—The dimensionless designator NPS (nominal pipe size) has
3.1.7 Optional requirements ( Section 8 and Section 11 of
been substituted in this standard for such traditional terms as “nominal
diameter,” “size,” and “nominal size.” Specification A530/A530M),
3.1.8 Test report required (Certification Section of Specifi-
1.3 The following hazard caveat applies to the test methods
cation A530/A530M),
portion, Section 16, only.This standard does not purport to
3.1.9 Specification designation,
address all of the safety concerns, if any, associated with its
3.1.10 End use of material, and
use. It is the responsibility of the user of this standard to
3.1.11 Special requirements.
establish appropriate safety and health practices and deter-
mine the applicability of regulatory limitations prior to use.
4. General Requirements
4.1 Material furnished to this specification shall conform to
2. Referenced Documents
the applicable requirements of the current edition of Specifi-
2.1 ASTM Standards:
cation A530/A530M unless otherwise provided herein.
A530/A530MSpecification for General Requirements for
Specialized Carbon and Alloy Steel Pipe
5. Materials and Manufacture
E29Practice for Using Significant Digits in Test Data to
5.1 Process:
Determine Conformance with Specifications
5.1.1 The steel shall be killed steel made by one or more of
the following processes: open-hearth, electric-furnace, or
basic-oxygen.
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
5.1.2 The steel shall be made to fine grain practice.
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
5.1.3 Steel may be cast in ingots or may be strand cast.
A01.09 on Carbon Steel Tubular Products.
When steel of different grades are sequentially strand cast,
Current edition approved Oct. 1, 2005. Published November 2005. Originally
approved in 1965. Last previous edition approved in 2001 as A524–96 (2001). identification of the resultant transition material is required.
DOI: 10.1520/A0524-96R05.
The producer shall remove the transition material by any
For ASME Boiler and Pressure Vessel Code Applications see related Specifi-
established procedure that positively separates the grades.
cation SA-524 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute, 11 West 42nd St., 13th
the ASTM website. Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A524−96 (2005)
TABLE 1 Chemical Requirements
180° around a cylindrical mandrel, the diameter of which is
Element Grades I and II, Composition, % eight times the nominal diameter of the pipe, without failure.
Carbon, max 0.21
9.2.2 Forpipewhosediameterexceeds25in.(635mm)and
Manganese 0.90–1.35
whose diameter to wall thickness ratio is 7.0 or less, bend test
Phosphorus, max 0.035
specimens shall be bent at room temperature through 180°
Sulfur, max 0.035
Silicon 0.10–0.40 without cracking on the outside of the bent portion.The inside
diameterofthebendshallbe1in.(25.4mm).Thistestshallbe
in place of Section 10.
NOTE 3—Diameter to wall thickness ratio = specified outside diameter/
5.1.4 PipeNPS1 ⁄2 andundermaybeeitherhotfinishedor
nominal wall thickness.
cold drawn.
Example: For 28 in. diameter 5.000 in. thick pipe the diameter to wall
5.1.5 Unless otherwise specified, pipe NPS 2 and over shall thickness ratio = 28/5 = 5.6.
be furnished hot finished. When agreed upon between the
manufacturer and purchaser, cold-drawn pipe may be fur- 10. Flattening Test Requirements
nished.
10.1 ForpipeoverNPS2,asectionofpipenotlessthan2 ⁄2
5.2 Heat Treatment—All hot-finished and cold-drawn pipe in.(63.5mm)inlengthshallbeflattenedcoldbetweenparallel
shall be reheated to a temperature above 1550 °F (845°C) and platesuntiltheoppositewallsofthepipemeet.Flatteningtests
followed by cooling in air or in the cooling chamber of a shallbeinaccordancewithSpecificationA530/A530M,except
controlled atmosphere furnace. thatintheequationusedtocalculatetheHvalue,thefollowing
e constants shall be used:
6. Chemical Composition
0.07 for Grade I
0.08 for Grade II
6.1 The steel shall conform to the chemical requirements
prescribed in Table 1. 10.2 When low D-to-t ratio tubulars are tested, because the
strain imposed due to geometry is unreasonably high on the
7. Heat Analysis
insidesurfaceatthe6and12o’clocklocations,cracksatthese
locations shall not be cause for rejection if the D-to-t ratio is
7.1 An analysis of each heat of steel shall be made by the
less than ten.
steel manufacturer to determine the percentages of the ele-
ments specified in Section 6. The chemical composition thus
11. Hydrostatic Test Requirements
determined, or that determined from a product analysis made
by the manufacturer, if the latter has not manufactured the
11.1 Each length of pipe shall be subjected to the hydro-
steel, shall be reported to the purchaser or the purchaser’s
static pressure, except as provided in 11.2.
representative, and shall conform to the requirements specified
11.2 When specified in the order, pipe may be furnished
in Section 6.
without hydrostatic testing and each length so furnished shall
include with the mandatory marking the letters “NH.”
8. Product Analysis
11.3 When certification is required by the purchaser and the
8.1 At the request of the purchaser, analyses of two pipes
hydrostatic test has been omitted, the certification shall clearly
fromeachlot(Note2)shallbemadebythemanufacturerfrom
state “Not Hydrostatically Tested,” and the specification num-
the finished pipe. The chemical composition thus determined
ber and grade designation, as shown on the certification, shall
shall conform to the requirements specified in Section 6.
be followed by the letters “NH.”
NOTE2—Alotshallconsistof400lengths,orfractionthereof,foreach
size NPS 2 up to but not including NPS 6, and of 200 lengths, or fraction
12. Dimensions and Weights
thereof, for each size NPS 6 and over.
12.1 The dimensions and weights of plain-end pipe are
8.2 If the analysis of one of the tests specified in 8.1 does
included in ANSI B36.10. Sizes and wall thicknesses most
not conform to the requirements specified in 6, analyses shall
generally available are listed in Appendix X1.
bemadeonadditionalpipeofdoubletheoriginalnumberfrom
the same lot, each of which shall conform to requirements
13. Dimensions, Weight, and Permissible Variations
specified.
13.1 Weight—The weight of any length of pipe shall not
9. Physical Properties
vary more than 6.5% over and 3.5% under that specified for
pipe of Schedule 120 and lighter nor more than 10% over and
9.1 Tensile Properties—The material shall conform to the
requirements as to tensile properties prescribed in Table 2. 3.5% under that specified for pipe heavier than Schedule 120.
Unless otherwise agreed upon between the manufacturer and
9.2 Bending Properties:
purchaser, pipe in sizes NPS 4 and smaller may be weighed in
9.2.1 For pipe NPS 2 and under, a sufficient length of pipe
convenient lots; pipe in sizes larger than NPS 4 shall be
shall stand being bent cold through 90° around a cylindrical
weighed separately.
mandrel, the diameter of which is twelve times the nominal
diameterofthepipe,withoutdevelopingcracks.Whenordered 13.2 Diameter—Variations in outside diameter shall not
for close coiling, the pipe shall stand being bent cold through exceed those specified in Table 3.
A524−96 (2005)
TABLE 2 Tensile Requirements
Wall Thicknesses
Grade I, 0.375 in. (9.52 mm) Grade II, greater than 0.375 in.
and under (9.52 mm)
Tensile strength, psi (MPa) 60 000–85 000 55 000–80 000
(414–586) (380–550)
Yield strength, min, psi (MPa) 35 000 (240) 30 000 (205)
Longitudinal Transverse Longitudinal Transverse
Elongation in 2 in. or 50 mm, min %:
Basic minimum elongation for walls ⁄16 in. (7.9 mm) and over in thickness, strip 30 16.5 35 25
tests, and for all small sizes tested in full section
When standard round 2 in. or 50 mm gauge length test specimen is used for strip 22 12 28 20
A A
tests, a deduction for each ⁄32 in. (0.8 mm) decrease in wall thickness below 1.50 1.00 . .
⁄16 in. (7.9 mm) from the basic minimum elongation of the following
percentage
A
The following table gives the computed minimum values:
Wall Thickness Elongation in 2 in. or 50 mm, min, %
Grade I
in. mm Longitudinal Transverse
⁄16 (0.312) 7.94 30.0 16.5
⁄32 (0.281) 7.14 28.5 15.5
⁄4 (0.250) 6.35 27.0 14.5
⁄32 (0.219) 5.56 25.5 . . .
⁄16 (0.188) 4.76 24.0 . . .
⁄32 (0.156) 3.97 22.5 . . .
⁄8 (0.125) 3.18 21.0 . . .
⁄32 (0.094) 2.38 19.5 . . .
⁄16 (0.062) 1.59 18.0 . . .
Note—The above table gives the computed minimum elongation values for each ⁄32-in. (0.79-mm) decrease in wall thickness. Where the wall thickness lies between
two values shown above, the minimum elongation value is determined by the following equation:
Grade Direction of Test Equation
I transverse E = 32t + 6.50
I longitudinal E = 48t + 15.00
where:
E = elongation in 2 in. or 50 mm in% and
t = actual thickness of specimen, in. (mm).
TABLE 3 Variations in Outside Diameter
wall thickness shall be considered defects. Pipe with such
NPS Permissible Variations in Outside Diameter, in. (mm) defects shall be given one of the following dispositions:
Designator
Over Under
14.2.1 The defect may be removed by grinding provided
1 1 1 1
⁄8 to 1 ⁄2, incl ⁄64 (0.4) ⁄32 (0.8)
that the remaining wall thickness is within specified limits.
1 1 1
Over 1 ⁄2 to 4, incl ⁄32 (0.8) ⁄32 (0.8)
14.2.2 Repaired in accordance with the repair welding
1 1
Over 4 to 8, incl ⁄16 (1.6) ⁄32 (0.8)
3 1 provisions of 14.6.
Over 8 to 18, incl ⁄32 (2.4) ⁄32 (0.8)
1 1
Over 18 ⁄8 (3.2) ⁄32 (0.8)
14.2.3 The section of pipe containing the defect may be cut
off within the limits of requirements on length.
14.2.4 Rejected.
13.3 Thickness—The minimum wall thickness at any point
14.3 To provide a workmanlike finish and basis for evalu-
shallnotbemorethan12.5%underthenominalwallthickness
ating conformance with 14.2, the pipe manufacturer shall
specified.
remove by grinding the following noninjurious imperfections:
NOTE 4—The minimum wall thickness on inspection is shown in
14.3.1 Mechanical marks, abrasions (Note 5), and pits, any
Appendix X1. 1
of which imperfections are deeper than ⁄16 in. (1.58 mm).
14. Workmanship, Finish, and Appearance
NOTE5—Marksandabrasionsaredefinedascablemarks,dinges,guide
marks, roll marks, ball scratches, scores, die marks, and the like.
14.1 The pipe manufacturer shall explore a sufficient num-
14.3.2 Visualimperfections,commonlyreferredtoasscabs,
ber of visual surface imperfections to provide reasonable
seams, laps, tears, or slivers, found by exploration in accor-
assurance that they have been properly evaluated with respect
dance with 14.1 to be deeper than 5% of the nominal wall
to depth. Exploration of all surface imperfections is not
thickness.
required but may be necessary to assure compliance with 14.2.
14.2 Surfaceimperfectionsthatpenetratemorethan12 ⁄2 % 14.4 At the purchaser’s discretion, pipe shall be subject to
of the nominal wall thickness or encroach on the minimum rejectionifsurfaceimperfectionsacceptableunder14.2arenot
A524−96 (2005)
scattered, but appear over a large area in excess of what is shallbetakeninatransversedirection.Onetestspecimenshall
consideredaworkmanlikefinish.Dispositionofsuchpipeshall be taken as close to the outer surface as possible and another
be a matter of agreement between the manufacturer and the from as close to the inner surface as possible. The specimens
1 1 1
purchaser. shall be either ⁄2 by ⁄2 in. (12.7 mm) in section or 1 by ⁄2 in.
(25.4 by 12.7 mm) in section with the corners rounded to a
14.5 When imperfections or defects are removed by grind-
radius not over ⁄16 in. (1.6 mm) and need not exceed 6 in.
ing, a smooth curved surface shall be maintained, and the wall
(152mm) in length. The side of the samples placed in tension
thickness shall not be decreased below that permitted by this
during the bend shall be the side closest to the inner and outer
specification.Theoutsidediameteratthepointofgrindingmay
surface of the pipe respectively.
be reduced by the amount so removed.
14.5.1 Wall thickness measurements shall be made with a
17. Lengths
mechanical caliper or with a properly calibrated nondestruc-
17.1 Pipe lengths shall be in accordance with the following
tive testing device of appropriate accuracy. In case of dispute,
regular practice:
the measurement determined by use of the mechanical caliper
17.1.1 The lengths required shall be specified in the order,
shall govern.
and
14.6 Weld repair shall be permitted only subject to the
17.1.2 No
...

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:A 524–96 (Reapproved 2001) Designation: A524 – 96 (Reapproved 2005)
Standard Specification for
Seamless Carbon Steel Pipe for Atmospheric and Lower
Temperatures
This standard is issued under the fixed designation A524; 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 seamless carbon steel pipe intended primarily for service at atmospheric and lower temperatures,
NPS ⁄8 to 26 inclusive, with nominal (average) wall thickness as given in ANSI B36.10. Pipe having other dimensions may be
furnished, provided such pipe complies with all other requirements of this specification. Pipe ordered to this specification shall be
suitable both for welding, and for bending, flanging, and similar forming operations.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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”. size.”
1.3 The following hazard caveat applies to the test methods portion, Section 16, only.Thisstandarddoesnotpurporttoaddress
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.
2. Referenced Documents
2.1 ASTM Standards:
A530/A530M Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
2.2 American National Standards Institute Standard:
B36.10 Welded and Seamless Wrought Steel Pipe
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 or number of lengths),
3.1.2 Name of material (seamless carbon steel pipe),
3.1.3 Grade (Table 1 and Table 2),
3.1.4 Manufacture (hot finished or cold drawn),
3.1.5 Size (either nominal wall thickness and weight class or schedule number, or both, or outside diameter and nominal wall
thickness, ANSI B36.10),
3.1.6 Length (17),
3.1.7 Optional requirements ( Section 8 and Section 11 of Specification A 530/A 530MA530/A530M),
3.1.8 Test report required (Certification Section of Specification A 530/A 530MA530/A530M),
3.1.9 Specification designation,
3.1.10 End use of material, and
3.1.11 Special requirements.
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel,Steel and Related Alloys,Alloys and is the direct responsibility of
Subcommittee A01.09 on Carbon Steel Tubular Products.
Current edition approved Oct. 10, 1996. Published November 1997. Originally published as A 524–65. Last previous edition A 524–93.
Current edition approved Oct. 1, 2005. Published November 2005. Originally approved in 1965. Last previous edition approved in 2001 as A524 – 96 (2001). DOI:
10.1520/A0524-96R05.
For ASME Boiler and Pressure Vessel Code Applications see related Specification SA-524 in Section II of that Code.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. ForAnnualBookofASTMStandards
, Vol 01.01.volume information, refer to the standard’s Document Summary page on the ASTM website.
Annual Book of ASTM Standards, Vol 14.02.
Available from American National Standards Institute, 11 West 42nd St., 13th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A524 – 96 (2005)
TABLE 1 Chemical Requirements
Element Grades I and II, Composition, %
Carbon, max 0.21
Manganese 0.90–1.35
Phosphorus, max 0.035
Sulfur, max 0.035
Silicon 0.10–0.40
TABLE 2 Tensile Requirements
Wall Thicknesses
Grade I, 0.375 in. (9.52 mm) Grade II, greater than 0.375 in.
and under (9.52 mm)
Tensile strength, psi (MPa) 60 000–85 000 55 000–80 000
(414–586) (380–550)
Yield strength, min, psi (MPa) 35 000 (240) 30 000 (205)
Longitudinal Transverse Longitudinal Transverse
Elongation in 2 in. or 50 mm, min %:
Basic minimum elongation for walls ⁄16 in. (7.9 mm) and over in thickness, strip 30 16.5 35 25
tests, and for all small sizes tested in full section
When standard round 2 in. or 50 mm gage length test specimen is used for strip 22 12 28 20
A A
1 5
tests, a deduction for each ⁄32 in. (0.8 mm) decrease in wall thickness below ⁄16 1.50 1.00 . .
⁄16 in. (7.9 mm) from the basic minimum elongation of the following percentage
When standard round 2 in. or 50 mm gauge length test specimen is used for strip 22 12 28 20
1 5 A A
tests, a deduction for each ⁄32 in. (0.8 mm) decrease in wall thickness below ⁄16 1.50 1.00 . .
⁄16 in. (7.9 mm) from the basic minimum elongation of the following
percentage
A
The following table gives the computed minimum values:
Wall Thickness Elongation in 2 in. or 50 mm, min, %
Grade I
in. mm Longitudinal Transverse
⁄16 (0.312) 7.94 30.0 16.5
⁄32 (0.281) 7.14 28.5 15.5
⁄4 (0.250) 6.35 27.0 14.5
⁄32 (0.219) 5.56 25.5 . . .
⁄16 (0.188) 4.76 24.0 . . .
⁄32 (0.156) 3.97 22.5 . . .
⁄8 (0.125) 3.18 21.0 . . .
⁄32 (0.094) 2.38 19.5 . . .
⁄16 (0.062) 1.59 18.0 . . .
Note—The above table gives the computed minimum elongation values for each ⁄32-in. (0.79-mm) decrease in wall thickness. Where the wall thickness lies between
two values shown above, the minimum elongation value is determined by the following equation:
Grade Direction of Test Equation
I transverse E = 32t + 6.50
I longitudinal E = 48t + 15.00
where:
E = elongation in 2 in. or 50 mm in % and
t = actual thickness of specimen, in. (mm).
4. General Requirements
4.1 Material furnished to this specification shall conform to the applicable requirements of the current edition of Specification
A 530/A 530MA530/A530M unless otherwise provided herein.
5. Materials and Manufacture
5.1 Process:
5.1.1 The steel shall be killed steel made by one or more of the following processes: open-hearth, electric-furnace, or
basic-oxygen.
5.1.2 The steel shall be made to fine grain practice.
5.1.3 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 any established procedure that
positively separates the grades.
A524 – 96 (2005)
5.1.4 Pipe NPS 1 ⁄2 and under may be either hot finished or cold drawn.
5.1.5 Unless otherwise specified, pipe NPS 2 and over shall be furnished hot finished. When agreed upon between the
manufacturer and purchaser, cold-drawn pipe may be furnished.
5.2 Heat Treatment:
5.2.1All—All hot-finished and cold-drawn pipe shall be reheated to a temperature above 1550 °F (845°C) and followed by
cooling in air or in the cooling chamber of a controlled atmosphere furnace.
6. Chemical Composition
6.1 The steel shall conform to the chemical requirements prescribed in Table 1.
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 in Section 6. The chemical composition thus determined, or that determined from a product analysis made by the
manufacturer, if the latter has not manufactured the steel, shall be reported to the purchaser or the purchaser’s representative, and
shall conform to the requirements specified in Section 6.
8. Product Analysis
8.1 At the request of the purchaser, analyses of two pipes from each lot (Note 2) shall be made by the manufacturer from the
finished pipe. The chemical composition thus determined shall conform to the requirements specified in Section 6.
NOTE 2—A lot shall consist of 400 lengths, or fraction thereof, for each size NPS 2 up to but not including NPS 6, and of 200 lengths, or fraction
thereof, for each size NPS 6 and over.
8.2 Iftheanalysisofoneofthetestsspecifiedin8.1doesnotconformtotherequirementsspecifiedin6,analysesshallbemade
on additional pipe of double the original number from the same lot, each of which shall conform to requirements specified.
9. Physical Properties
9.1 Tensile Properties—The material shall conform to the requirements as to tensile properties prescribed in Table 2.
9.2 Bending Properties:
9.2.1 ForpipeNPS2andunder,asufficientlengthofpipeshallstandbeingbentcoldthrough90°aroundacylindricalmandrel,
thediameterofwhichistwelvetimesthenominaldiameterofthepipe,withoutdevelopingcracks.Whenorderedforclosecoiling,
the pipe shall stand being bent cold through 180° around a cylindrical mandrel, the diameter of which is eight times the nominal
diameter of the pipe, without failure.
9.2.2 For pipe whose diameter exceeds 25 in. (635 mm) and whose diameter to wall thickness ratio is 7.0 or less, bend test
specimens shall be bent at room temperature through 180° without cracking on the outside of the bent portion.The inside diameter
of the bend shall be 1 in. (25.4 mm). This test shall be in place of Section 10.
NOTE 3—Diameter to wall thickness ratio = specified outside diameter/nominal wall thickness.
Example: For 28 in. diameter 5.000 in. thick pipe the diameter to wall thickness ratio = 28/5 = 5.6.
10. Flattening Test Requirements
10.1 For pipe over NPS 2, a section of pipe not less than 2 ⁄2 in. (63.5 mm) in length shall be flattened cold between parallel
plates until the opposite walls of the pipe meet. Flattening tests shall be in accordance with Specification A 530A530/A530M,
except that in the equation used to calculate the H value, the following e constants shall be used:
0.07 for Grade I
0.08 for Grade II
10.2 When low D-to-t ratio tubulars are tested, because the strain imposed due to geometry is unreasonably high on the inside
surface at the 6 and 12 o’clock locations, cracks at these locations shall not be cause for rejection if the D-to-t ratio is less than
10. ten.
11. Hydrostatic Test Requirements
11.1 Each length of pipe shall be subjected to the hydrostatic pressure, except as provided in 11.2.
11.2 When specified in the order, pipe may be furnished without hydrostatic testing and each length so furnished shall include
with the mandatory marking the letters “NH.”
11.3 Whencertificationisrequiredbythepurchaserandthehydrostatictesthasbeenomitted,thecertificationshallclearlystate
“Not Hydrostatically Tested,” and the specification number and grade designation, as shown on the certification, shall be followed
by the letters “NH.”
12. Dimensions and Weights
12.1 The dimensions and weights of plain-end pipe are included in ANSI B36.10. Sizes and wall thicknesses most generally
available are listed in Appendix X1.
A524 – 96 (2005)
13. Dimensions, Weight, and Permissible Variations
13.1 Weight—The weight of any length of pipe shall not vary more than 6.5 % over and 3.5 % under that specified for pipe of
Schedule 120 and lighter nor more than 10 % over and 3.5 % under that specified for pipe heavier than Schedule 120. Unless
otherwise agreed upon between the manufacturer and purchaser, pipe in sizes NPS 4 and smaller may be weighed in convenient
lots; pipe in sizes larger than NPS 4 shall be weighed separately.
13.2 Diameter—Variations in outside diameter shall not exceed those specified in Table 3.
13.3 Thickness—The minimum wall thickness at any point shall not be more than 12.5 % under the nominal wall thickness
specified.
NOTE 4—The minimum wall thickness on inspection is shown in Appendix X1.
14. Workmanship, Finish, and Appearance
14.1 The pipe manufacturer shall explore a sufficient number of visual surface imperfections to provide reasonable assurance
that they have been properly evaluated with respect to depth. Exploration of all surface imperfections is not required but may be
necessary to assure compliance with 14.2.
14.2 Surface imperfections that penetrate more than 12 ⁄2 % of the nominal wall thickness or encroach on the minimum wall
thickness shall be considered defects. Pipe with such defects shall be given one of the following dispositions:
14.2.1 The defect may be removed by grinding provided that the remaining wall thickness is within specified limits.
14.2.2 Repaired in accordance with the repair welding provisions of 14.6.
14.2.3 The section of pipe containing the defect may be cut off within the limits of requirements on length.
14.2.4 Rejected.
14.3 To provide a workmanlike finish and basis for evaluating conformance with 14.2, the pipe manufacturer shall remove by
grinding the following noninjurious imperfections:
14.3.1 Mechanical marks, abrasions (Note 5), and pits, any of which imperfections are deeper than ⁄16 in. (1.58 mm).
NOTE 5—Marks and abrasions are defined as cable marks, dinges, guide marks, roll marks, ball scratches, scores, die marks, and the like.
14.3.2 Visual imperfections, commonly referred to as scabs, seams, laps, tears, or slivers, found by exploration in accordance
with 14.1 to be deeper than 5 % of the nominal wall thickness.
14.4 At the purchaser’s discretion, pipe shall be subject to rejection if surface imperfections acceptable under 14.2 are not
scattered, but appear over a large area in excess of what is considered a workmanlike finish. Disposition of such pipe shall be a
matter of agreement between the manufacturer and the purchaser.
14.5 When imperfections or defects are removed by grinding, a smooth curved surface shall be maintained, and the wall
thickness shall not be decreased below that permitted by this specification. The outside diameter at the point of grinding may be
reduced by the amount so removed.
14.5.1 Wall thickness measurements shall be made with a mechanical caliper or with a properly calibrated nondestruc-tive
testing device of appropriate accuracy. In case of dispute, the measurement determined by use of the mechanical caliper shall
govern.
14.6 Weld repair shall be permitted only subject to the approval of the purchaser and in accordance wi
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