ASTM B751-08(2018)
(Specification)Standard Specification for General Requirements for Nickel and Nickel Alloy Welded Tube
Standard Specification for General Requirements for Nickel and Nickel Alloy Welded Tube
ABSTRACT
This general specification contains the mandatory requirements to the ASTM standards listed herein for longitudinally welded tubular products made from nickel and nickel alloys. In case of conflict, the requirements listed in the particular product specification takes precedence over those listed here.
SCOPE
1.1 This specification contains various requirements that, with the exception of Sections 6 and 7, are mandatory requirements to the following ASTM nickel and nickel alloy, longitudinally welded tubular product specifications:
Title of Specification
ASTM
Designation
Welded UNS N08020, N08024, and UNS N08026 Alloy Tubes
B468
Welded UNS N08120, UNS N08800, UNS N08810, UNS N08811 Alloy Tubes
B515
Welded Nickel-Chromium-Iron Alloy (UNS N06600, UNS N06603, UNS N06025, and UNS N06045) Tubes
B516
Welded Nickel and Nickel-Cobalt Alloy Tube
B626
UNS N08904, UNS N08925, and UNS N08926 Welded Tube
B674
UNS N08366 and UNS N08367 Welded Tube
B676
Welded UNS N06625, N06219, and N08825 Alloy Tubes
B704
Ni-Cr-Mo-Co-W-Fe-Si Alloy (UNS N06333) Welded Tube
B726
Welded Nickel (UNS N02200/UNS N02201) and Nickel Copper Alloy (UNS N04400) Tube
B730
1.2 One or more of the test requirements of Section 6 apply only if specifically stated in the product specification or in the purchase order.
1.3 In case of conflict between a requirement of the product specification and a requirement of this general specification, only the requirement of the product specification need be satisfied.
1.4 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.
1.5 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 become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation:B751 −08 (Reapproved 2018)
Standard Specification for
General Requirements for Nickel and Nickel Alloy Welded
Tube
This standard is issued under the fixed designation B751; 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 1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification contains various requirements that,
ization established in the Decision on Principles for the
with the exception of Sections 6 and 7, are mandatory
Development of International Standards, Guides and Recom-
requirements to the following ASTM nickel and nickel alloy,
mendations issued by the World Trade Organization Technical
longitudinally welded tubular product specifications:
Barriers to Trade (TBT) Committee.
ASTM
Title of Specification
Designation
Welded UNS N08020, N08024, and UNS N08026 Alloy Tubes B468 2. Referenced Documents
Welded UNS N08120, UNS N08800, UNS N08810, UNS B515
2.1 ASTM Standards:
N08811 Alloy Tubes
Welded Nickel-Chromium-Iron Alloy (UNS N06600, UNS B516
B468 Specification for Welded UNS N08020 Alloy Tubes
N06603, UNS N06025, and UNS N06045) Tubes
B515 Specification forWelded UNS N08120, UNS N08800,
Welded Nickel and Nickel-Cobalt Alloy Tube B626
UNS N08810, and UNS N08811 Alloy Tubes
UNS N08904, UNS N08925, and UNS N08926 Welded Tube B674
UNS N08366 and UNS N08367 Welded Tube B676
B516 SpecificationforWeldedNickel-Chromium-IronAlloy
Welded UNS N06625, N06219, and N08825 Alloy Tubes B704
(UNS N06600, UNS N06601, UNS N06603, UNS
Ni-Cr-Mo-Co-W-Fe-Si Alloy (UNS N06333) Welded Tube B726
N06025, UNS N06045, UNS N06690, and UNS N06693)
Welded Nickel (UNS N02200/UNS N02201) and Nickel Cop- B730
per Alloy (UNS N04400) Tube
Tubes
B626 Specification for Welded Nickel and Nickel-Cobalt
1.2 One or more of the test requirements of Section 6 apply
Alloy Tube
only if specifically stated in the product specification or in the
B674 Specification for UNS N08925, UNS N08354, and
purchase order.
UNS N08926 Welded Tube
1.3 In case of conflict between a requirement of the product
B676 Specification for UNS N08367 Welded Tube
specification and a requirement of this general specification,
B704 Specification for Welded UNS N06625, UNS N06219
only the requirement of the product specification need be
and UNS N08825 Alloy Tubes
satisfied.
B726 Specification for Nickel-Chromium-Molybdenum-
1.4 The values stated in inch-pound units are to be regarded
Cobalt-Tungsten-Iron-Silicon Alloy (UNS N06333)
as standard. The values given in parentheses are mathematical
Welded Tube
conversions to SI units that are provided for information only
B730 Specification for Welded Nickel (UNS N02200/UNS
and are not considered standard.
N02201) and Nickel Copper Alloy (UNS N04400) Tube
1.5 This standard does not purport to address all of the B880 Specification for General Requirements for Chemical
safety concerns, if any, associated with its use. It is the Check Analysis Limits for Nickel, Nickel Alloys and
responsibility of the user of this standard to become familiar Cobalt Alloys
with all hazards including those identified in the appropriate E8/E8M Test Methods for Tension Testing of Metallic Ma-
Safety Data Sheet (SDS) for this product/material as provided terials
by the manufacturer, to establish appropriate safety, health, E18 Test Methods for Rockwell Hardness of Metallic Ma-
and environmental practices, and determine the applicability terials
of regulatory limitations prior to use. E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Refined Nickel and Cobalt and Their Alloys. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2018. Published November 2018. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1985. Last previous edition approved in 2013 as B751 – 08 (2013). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/B0751-08R18. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B751−08 (2018)
E39 Methods for Chemical Analysis of Nickel (Withdrawn shallnotdeviatefromthenominaldiameterbymorethantwice
1995) the permissible variation in outside diameter given in the table;
E76 Test Methods for Chemical Analysis of Nickel-Copper however, the mean diameter at that cross section must still be
Alloys (Withdrawn 2003) within the permissible variation.
E112 Test Methods for Determining Average Grain Size
4.2 Length—When material is ordered cut-to-length, the
E213 Practice for Ultrasonic Testing of Metal Pipe and
length shall conform to the permissible variations prescribed in
Tubing
Table 2.
E273 Practice for Ultrasonic Testing of the Weld Zone of
4.3 Straightness—Material shall be reasonably straight and
Welded Pipe and Tubing
free of bends and kinks.
E309 Practice for Eddy Current Examination of Steel Tubu-
lar Products Using Magnetic Saturation
4.4 Ends—Ends shall be plain or cut and deburred.
E426 Practice for Electromagnetic (Eddy Current) Examina-
tion of Seamless and Welded Tubular Products, Titanium,
5. Workmanship, Finish, and Appearance
Austenitic Stainless Steel and Similar Alloys
5.1 The material shall be uniform in quality and temper,
E571 PracticeforElectromagnetic(Eddy-Current)Examina-
smooth, and free of imperfections that would render it unfit for
tion of Nickel and Nickel Alloy Tubular Products
use.
E1473 Test Methods for Chemical Analysis of Nickel, Co-
balt and High-Temperature Alloys
6. Test Requirements
2.2 Other Documents:
SNT-TC-1A RecommendedPracticeforNondestructivePer-
6.1 Flange Test:
sonnel Qualification and Certification
6.1.1 Alength of tube not less than three times the specified
diameter or 4 in. (102 mm), whichever is longer, shall be
3. Terminology
capable of having a flange turned over at a right angle to the
3.1 Definitions:
body of the tube without cracking or showing imperfections
3.1.1 averagediameter,n—theaverageofthemaximumand
rejectable under the provisions of the product specification.
minimum outside diameters, as determined at any one cross
The width of the flange shall not be less than 15 % of the tube
section of the tube.
diameter.
3.1.2 nominalwall,n—aspecifiedwallthicknesswithaplus 6.1.2 The flanged specimen shall not exhibit through wall
cracking or any cracking observable without magnification.
and minus tolerance from the specified thickness.
3.1.3 thin wall tube, n—tube with specified wall thickness
6.2 Flattening Test:
3 % or less of the specified outside diameter.
6.2.1 Alength of tube not less than 4 in. (102 mm), shall be
flattened under a load applied gradually at room temperature
3.1.4 welded tube, n—a hollow product of round or any
until the distance between the platens is five times the wall
other cross section having a continuous periphery.
thickness. The weld shall be positioned 90° from the direction
4. Dimensions and Permissible Variations
of the applied flattening force.
6.2.2 The flattened specimen shall not exhibit cracks.
4.1 Diameter and Wall Thickness—Individual measure-
6.2.3 Superficial ruptures resulting from surface imperfec-
ments shall not exceed the tolerances specified in Table 1. The
permissible variation in outside diameter is not sufficient to tions shall not be a cause for rejection.
provide for ovality in thin-walled tubes. For thin-walled tubes
6.3 Flare Test—The flare test shall consist of flaring a test
the maximum and minimum diameters at any cross section
specimen with an expanding tool having an included angle of
60° until the specified outside diameter has been increased by
30 %. The flared specimen shall not exhibit cracking through
The last approved version of this historical standard is referenced on
the wall.
www.astm.org.
AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
6.4 Pressure (Leak Test):
28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
A,B
TABLE 1 Permissible Variations for Outside Diameter and Wall Thickness of Welded Tube
Permissible Variations
Thickness of
Specified Outside Diameter Outside Diameter of Thickness of
Specified Minimum Wall,%
Specified Nominal Wall, %
in. (mm) + − + − + −
Over 0.125 (3.2) to ⁄8 (16), excl 0.004 (0.13) 0.005 (0.10) 12.5 12.5 28 0
5 1
⁄8 (16) to 1 ⁄2 (38), incl 0.0075 (0.19) 0.0075 (0.19) 12.5 12.5 28 0
Over 1 ⁄2 (38) to 3 (76), incl 0.010 (0.25) 0.010 (0.25) 12.5 12.5 28 0
Over 3 (76) to 4 ⁄2 (114), incl 0.015 (0.38) 0.015 (0.38) 12.5 12.5 28 0
Over 4 ⁄2 (114) to 6 (152), incl 0.020 (0.51) 0.020 (0.51) 12.5 12.5 28 0
A
These permissible variations in outside diameter apply only to material as finished at the mill before subsequent swaging, expanding, bending, polishing, or other
fabricating operations.
B
The ovality provisions of 4.1 apply.
B751−08 (2018)
A
TABLE 2 Permissible Variations in Length
orientation, width, etc., the correlation between the signal
Outside Diameter, in. (mm) Cut Length, in. (mm)
produced in the electric test from an imperfection and from
Over Under
calibration standards is only approximate. A purchaser inter-
Cold-finished: under 2 (50.8) ⁄8 (3.2) 0
ested in ascertaining the nature (type, size, location, and
Hot-finished: 2 (50.8) and over ⁄16 (4.8) 0
all sizes ⁄16 (4.8) 0
orientation) of discontinuities that can be detected in the
A
These permissible variations in length apply to tube in straight lengths. They
specific application of these examinations should discuss this
apply to cut lengths up to and including 24 ft (7.3 m). For lengths over 24 ft an
with the manufacturer of the tubular product.
additionalover-toleranceof ⁄8in.(3.2mm)foreach10ft(3.0m)orfractionthereof
1 6.5.2.2 The ultrasonic examination referred to in this speci-
shallbepermissibleuptoamaximumadditionalover-toleranceof ⁄2in.(12.7mm).
ficationisintendedtodetectlongitudinaldiscontinuitieshaving
a reflective area similar to or larger than the calibration
1 reference notches specified in 6.5.8. The examination may not
6.4.1 Hydrostatic—Each tube with an outside diameter ⁄8
detect circumferentially oriented imperfections or short, deep
in. (3 mm) and larger, and with wall thickness of 0.015 in.
defects.
(0.38 mm) and over, shall be tested by the manufacturer to a
6.5.2.3 The eddy current examination referenced in this
minimum internal hydrostatic pressure of 1000 psi (6.9 MPa)
specification has the capability of detecting significant
provided that the fiber stress calculated in accordance with the
discontinuities, especially of the short abrupt type. Practices
following equation does not exceed the allowable fiber stress,
E309 and E426 contain additional information regarding the
S, indicated as follows:
capabilities and limitations of eddy-current examination.
P 5 2St/D (1)
6.5.2.4 The hydrostatic test referred to in 6.4.1 is a test
where: method provided for in many product specifications. This test
hasthecapabilityoffindingdefectsofasizepermittingthetest
P = hydrostatic test pressure, psi (MPa),
fluid to leak through the tube wall and may be either visually
S = allowable fiber stress, for material in the condition
seen or detected by a loss of pressure. This test may not detect
(temper) furnished as specified in the product specifi-
very tight, through-the-wall defects or defects that extend an
cation (S is calculated as the lower of ⁄3 of the specified
appreciable distance into the wall without complete penetra-
minimum 0.2 % offset yield strength or ⁄4 of the
tion.
specified minimum ultimate strength for the material),
t = minimum wall thickness, in. (mm), equal to the speci- 6.5.2.5 A purchaser interested in ascertaining the nature
fied average wall minus the permissible minus wall
(type, size, location, and orientation) of discontinuities that can
tolerance, or the specified minimum wall thickness, and be detected in the specific application of these examinations
D = outside diameter of the tube, in. (mm).
should discuss this with the manufacturer of the tubular
products.
6.4.1.1 Thetestpressureshallbeheldforasufficienttimeto
6.5.3 Time of Examination: Nondestructive examination for
permit the entire length of the tube to be inspected.
specification acceptance shall be performed after all deforma-
6.4.2 Pneumatic (Air Underwater) Test—Each tube with a
tion processing, heat treating, welding, and straightening op-
nominal wall thickness exceeding 0.025 in. (0.64 mm) shall be
erations. This requirement does not preclude additional testing
tested at a minimum pressure of 150 psi (1.05 MPa). The test
at earlier stages in the processing.
pressure for tubes having a nominal wall thickness of 0.025 in.
6.5.4 Surface Condition:
(0.64mm)andundershallbe75psi(0.52MPa)minimum.The
6.5.4.1 All surfaces shall be free of scale, dirt, grease, paint,
test pressure shall be held for a minimum of 5 s. Visual
orotherforeignmaterialthatcouldinterferewithinterpretation
examination is to be made when the material is submerged and
oftestresults.Themethodsusedforcleaningandpreparingthe
under pressure. The full length of material must be examined
surfaces for examination shall not be detrimental to the base
for leaks.
6.4.3 If any tube shows leaks during hydrostatic or pneu- metal or the surface finish.
matic testing, it shall be rejected. 6.5.4.2 Excessive surface roughness or deep scratches can
produce signals that interfere with the test.
6.5 Nondestructive Examination:
6.5.5 Extent of Examination:
6.5.1 Each tube shall be examined by a nondestructive
6.5.5.1 The relative motion of the tube and the
examination method in accordance with Practices E213, E309,
transducer(s), coil(s), or sensor(s) shall be such that the entire
E426,or E571. Upon agreement, Practice E273 shall be
tube surface is scanned, except for end effects as noted in
employed in addition to one of the full periphery tests. The
6.5.5.2.
range of tube sizes that may be examined by each method shall
6.5.5.2 The existence of end effects is recognized, and the
be subject to the limitations in the scope of that practice. In
extent of such effects shall be determined by the manufacturer,
case of conflict between these methods and practices and this
and, if requested, shall be reported to the purchaser. Other
specification, the requirements
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: B751 − 08 (Reapproved 2013) B751 − 08 (Reapproved 2018)
Standard Specification for
General Requirements for Nickel and Nickel Alloy Welded
Tube
This standard is issued under the fixed designation B751; 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 contains various requirements that, with the exception of Sections 6 and 7, are mandatory requirements
to the following ASTM nickel and nickel alloy, longitudinally welded tubular product specifications:
ASTM
Title of Specification
Designation
Welded UNS N08020, N08024, and UNS N08026 Alloy Tubes B468
Welded UNS N08120, UNS N08800, UNS N08810, UNS B515
N08811 Alloy Tubes
Welded Nickel-Chromium-Iron Alloy (UNS N06600, UNS B516
N06603, UNS N06025, and UNS N06045) Tubes
Welded Nickel and Nickel-Cobalt Alloy Tube B626
UNS N08904, UNS N08925, and UNS N08926 Welded Tube B674
UNS N08366 and UNS N08367 Welded Tube B676
Welded UNS N06625, N06219, and N08825 Alloy Tubes B704
Ni-Cr-Mo-Co-W-Fe-Si Alloy (UNS N06333) Welded Tube B726
Welded Nickel (UNS N02200/UNS N02201) and Nickel Cop- B730
per Alloy (UNS N04400) Tube
1.2 One or more of the test requirements of Section 6 apply only if specifically stated in the product specification or in the
purchase order.
1.3 In case of conflict between a requirement of the product specification and a requirement of this general specification, only
the requirement of the product specification need be satisfied.
1.4 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.
1.5 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 become familiar with all hazards including those identified in the appropriate Material Safety Data
Sheet (MSDS)(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety safety, health, and
healthenvironmental practices, and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
B468 Specification for Welded UNS N08020 Alloy Tubes
B515 Specification for Welded UNS N08120, UNS N08800, UNS N08810, and UNS N08811 Alloy Tubes
B516 Specification for Welded Nickel-Chromium-Iron Alloy (UNS N06600, UNS N06601, UNS N06603, UNS N06025, UNS
N06045, UNS N06690, and UNS N06693) Tubes
B626 Specification for Welded Nickel and Nickel-Cobalt Alloy Tube
B674 Specification for UNS N08925, UNS N08354, and UNS N08926 Welded Tube
This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.07 on Refined
Nickel and Cobalt and Their Alloys.
Current edition approved Feb. 1, 2013Nov. 1, 2018. Published February 2013November 2018. Originally approved in 1985. Last previous edition approved in 20082013
as B751 – 08. 08 (2013). DOI: 10.1520/B0751-08R13.10.1520/B0751-08R18.
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 Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B751 − 08 (2018)
A,B
TABLE 1 Permissible Variations for Outside Diameter and Wall Thickness of Welded Tube
Permissible Variations
Thickness of
Specified Outside Diameter Outside Diameter of Thickness of
Specified Minimum Wall,%
Specified Nominal Wall, %
in. (mm) + − + − + −
Over 0.125 (3.2) to ⁄8 (16), excl 0.004 (0.13) 0.005 (0.10) 12.5 12.5 28 0
5 1
⁄8 (16) to 1 ⁄2 (38), incl 0.0075 (0.19) 0.0075 (0.19) 12.5 12.5 28 0
Over 1 ⁄2 (38) to 3 (76), incl 0.010 (0.25) 0.010 (0.25) 12.5 12.5 28 0
Over 3 (76) to 4 ⁄2 (114), incl 0.015 (0.38) 0.015 (0.38) 12.5 12.5 28 0
Over 4 ⁄2 (114) to 6 (152), incl 0.020 (0.51) 0.020 (0.51) 12.5 12.5 28 0
A
These permissible variations in outside diameter apply only to material as finished at the mill before subsequent swaging, expanding, bending, polishing, or other
fabricating operations.
B
The ovality provisions of 4.1 apply.
B676 Specification for UNS N08367 Welded Tube
B704 Specification for Welded UNS N06625, UNS N06219 and UNS N08825 Alloy Tubes
B726 Specification for Nickel-Chromium-Molybdenum-Cobalt-Tungsten-Iron-Silicon Alloy (UNS N06333) Welded Tube
B730 Specification for Welded Nickel (UNS N02200/UNS N02201) and Nickel Copper Alloy (UNS N04400) Tube
B880 Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys
E8E8/E8M Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
E18 Test Methods for Rockwell Hardness of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E39 Methods for Chemical Analysis of Nickel (Withdrawn 1995)
E76 Test Methods for Chemical Analysis of Nickel-Copper Alloys (Withdrawn 2003)
E112 Test Methods for Determining Average Grain Size
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 and Welded Tubular Products, Titanium, Austenitic
Stainless Steel and Similar Alloys
E571 Practice for Electromagnetic (Eddy-Current) Examination of Nickel and Nickel Alloy Tubular Products
E1473 Test Methods for Chemical Analysis of Nickel, Cobalt and High-Temperature Alloys
2.2 Other Documents:
SNT-TC-1A Recommended Practice for Nondestructive Personnel Qualification and Certification
3. Terminology
3.1 Definitions:
3.1.1 average diameter, n—the average of the maximum and minimum outside diameters, as determined at any one cross section
of the tube.
3.1.2 nominal wall, n—a specified wall thickness with a plus and minus tolerance from the specified thickness.
3.1.3 thin wall tube, n—tube with specified wall thickness 3 % or less of the specified outside diameter.
3.1.4 welded tube, n—a hollow product of round or any other cross section having a continuous periphery.
4. Dimensions and Permissible Variations
4.1 Diameter and Wall Thickness—Individual measurements shall not exceed the tolerances specified in Table 1. The
permissible variation in outside diameter is not sufficient to provide for ovality in thin-walled tubes. For thin-walled tubes the
maximum and minimum diameters at any cross section shall not deviate from the nominal diameter by more than twice the
permissible variation in outside diameter given in the table; however, the mean diameter at that cross section must still be within
the permissible variation.
4.2 Length—When material is ordered cut-to-length, the length shall conform to the permissible variations prescribed in Table
2.
4.3 Straightness—Material shall be reasonably straight and free of bends and kinks.
4.4 Ends—Ends shall be plain or cut and deburred.
The last approved version of this historical standard is referenced on www.astm.org.
Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
B751 − 08 (2018)
A
TABLE 2 Permissible Variations in Length
Outside Diameter, in. (mm) Cut Length, in. (mm)
Over Under
Cold-finished: under 2 (50.8) ⁄8 (3.2) 0
Hot-finished: 2 (50.8) and over ⁄16 (4.8) 0
all sizes ⁄16 (4.8) 0
A
These permissible variations in length apply to tube in straight lengths. They
apply to cut lengths up to and including 24 ft (7.3 m). For lengths over 24 ft an
additional over-tolerance of ⁄8 in. (3.2 mm) for each 10 ft (3.0 m) or fraction thereof
shall be permissible up to a maximum additional over-tolerance of ⁄2 in. (12.7 mm).
5. Workmanship, Finish, and Appearance
5.1 The material shall be uniform in quality and temper, smooth, and free of imperfections that would render it unfit for use.
6. Test Requirements
6.1 Flange Test:
6.1.1 A length of tube not less than three times the specified diameter or 4 in. (102 mm), whichever is longer, shall be capable
of having a flange turned over at a right angle to the body of the tube without cracking or showing imperfections rejectable under
the provisions of the product specification. The width of the flange shall not be less than 15 % of the tube diameter.
6.1.2 The flanged specimen shall not exhibit through wall cracking or any cracking observable without magnification.
6.2 Flattening Test:
6.2.1 A length of tube not less than 4 in. (102 mm), shall be flattened under a load applied gradually at room temperature until
the distance between the platens is five times the wall thickness. The weld shall be positioned 90° from the direction of the applied
flattening force.
6.2.2 The flattened specimen shall not exhibit cracks.
6.2.3 Superficial ruptures resulting from surface imperfections shall not be a cause for rejection.
6.3 Flare Test—The flare test shall consist of flaring a test specimen with an expanding tool having an included angle of 60°
until the specified outside diameter has been increased by 30 %. The flared specimen shall not exhibit cracking through the wall.
6.4 Pressure (Leak Test):
6.4.1 Hydrostatic—Each tube with an outside diameter ⁄8 in. (3 mm) and larger, and with wall thickness of 0.015 in. (0.38 mm)
and over, shall be tested by the manufacturer to a minimum internal hydrostatic pressure of 1000 psi (6.9 MPa) provided that the
fiber stress calculated in accordance with the following equation does not exceed the allowable fiber stress, S, indicated as follows:
P 5 2St/D (1)
where:
P = hydrostatic test pressure, psi (MPa),
S = allowable fiber stress, for material in the condition (temper) furnished as specified in the product specification (S is
2 1
calculated as the lower of ⁄3 of the specified minimum 0.2 % offset yield strength or ⁄4 of the specified minimum ultimate
strength for the material),
t = minimum wall thickness, in. (mm), equal to the specified average wall minus the permissible minus wall tolerance, or the
specified minimum wall thickness, and
D = outside diameter of the tube, in. (mm).
6.4.1.1 The test pressure shall be held for a sufficient time to permit the entire length of the tube to be inspected.
6.4.2 Pneumatic (Air Underwater) Test—Each tube with a nominal wall thickness exceeding 0.025 in. (0.64 mm) shall be tested
at a minimum pressure of 150 psi (1.05 MPa). The test pressure for tubes having a nominal wall thickness of 0.025 in. (0.64 mm)
and under shall be 75 psi (0.52 MPa) minimum. The test pressure shall be held for a minimum of 5 s. Visual examination is to
be made when the material is submerged and under pressure. The full length of material must be examined for leaks.
6.4.3 If any tube shows leaks during hydrostatic or pneumatic testing, it shall be rejected.
6.5 Nondestructive Examination:
6.5.1 Each tube shall be examined by a nondestructive examination method in accordance with Practices E213, E309, E426,
or E571. Upon agreement, Practice E273 shall be employed in addition to one of the full periphery tests. The range of tube sizes
that may be examined by each method shall be subject to the limitations in the scope of that practice. In case of conflict between
these methods and practices and this specification, the requirements of this specification shall prevailprevail.
6.5.2 The following information is for the benefit of the user of this specification.
6.5.2.1 Calibration standards for the nondestructive electric test are convenient standards for calibration of nondestructive
testing equipment only. For several reasons, including shape, orientation, width, etc., the correlation between the signal produced
in the electric test from an imperfection and from calibration standards is only approximate. A purchaser interested in ascertaining
B751 − 08 (2018)
the nature (type, size, location, and orientation) of discontinuities that can be detected in the specific application of these
examinations should discuss this with the manufacturer of the tubular product.
6.5.2.2 The ultrasonic examination referred to in this specification is intended to detect longitudinal discontinuities having a
reflective area similar to or larger than the calibration reference notches specified in 6.5.8. The examination may not detect
circumferentially oriented imperfections or short, deep defects.
6.5.2.3 The eddy current examination referenced in this specification has the capability of detecting significant discontinuities,
especially of the short abrupt type. Practices E309 and E426 contain additional information regarding the capabilities and
limitations of eddy-current examination.
6.5.2.4 The hydrostatic test referred to in 6.4.1 is a test method provided for in many product specifications. This test has the
capability of finding defects of a size permitting the test fluid to leak through the tube wall and may be either visually seen or
detected by a loss of pressure. This test may not detect very tight, through-the-wall defects or defects that extend an appreciable
distance into the wall without complete penetration.
6.5.2.5 A purchaser interested in ascertaining the nature (type, size, location, and orientation) of discontinuities that can be
detected in the specific application of these examinations should discuss this with the manufacturer of the tubular products.
6.5.3 Time of Examination: Nondestructive examination for specification acceptance shall be performed after all deformation
processing, heat treating, welding, and straightening operat
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