ASTM A370-24
(Test Method)Standard Test Methods and Definitions for Mechanical Testing of Steel Products
Standard Test Methods and Definitions for Mechanical Testing of Steel Products
SIGNIFICANCE AND USE
4.1 The primary use of these test methods is testing to determine the specified mechanical properties of steel, stainless steel, and related alloy products for the evaluation of conformance of such products to a material specification under the jurisdiction of ASTM Committee A01 and its subcommittees as designated by a purchaser in a purchase order or contract.
4.1.1 These test methods may be and are used by other ASTM Committees and other standards writing bodies for the purpose of conformance testing.
4.1.2 The material condition at the time of testing, sampling frequency, specimen location and orientation, reporting requirements, and other test parameters are contained in the pertinent material specification or in a general requirement specification for the particular product form.
4.1.3 Some material specifications require the use of additional test methods not described herein; in such cases, the required test method is described in that material specification or by reference to another appropriate test method standard.
4.2 These test methods are also suitable to be used for testing of steel, stainless steel and related alloy materials for other purposes, such as incoming material acceptance testing by the purchaser or evaluation of components after service exposure.
4.2.1 As with any mechanical testing, deviations from either specification limits or expected as-manufactured properties can occur for valid reasons besides deficiency of the original as-fabricated product. These reasons include, but are not limited to: subsequent service degradation from environmental exposure (for example, temperature, corrosion); static or cyclic service stress effects, mechanically-induced damage, material inhomogeneity, anisotropic structure, natural aging of select alloys, further processing not included in the specification, sampling limitations, and measuring equipment calibration uncertainty. There is statistical variation in all aspects of mechanical testin...
SCOPE
1.1 These test methods2 cover procedures and definitions for the mechanical testing of steels, stainless steels, and related alloys. The various mechanical tests herein described are used to determine properties required in the product specifications. Variations in testing methods are to be avoided, and standard methods of testing are to be followed to obtain reproducible and comparable results. In those cases in which the testing requirements for certain products are unique or at variance with these general procedures, the product specification testing requirements shall control.
1.2 The following mechanical tests are described:
Sections
Tension
7 to 14
Bend
15
Hardness
16
Brinell
17
Rockwell
18
Portable
19
Impact
20 to 30
Keywords
32
1.3 Annexes covering details peculiar to certain products are appended to these test methods as follows:
Annex
Bar Products
Annex A1
Tubular Products
Annex A2
Fasteners
Annex A3
Round Wire Products
Annex A4
Significance of Notched-Bar Impact Testing
Annex A5
Converting Percentage Elongation of Round Specimens to
Equivalents for Flat Specimens
Annex A6
Testing Multi-Wire Strand
Annex A7
Rounding of Test Data
Annex A8
Methods for Testing Steel Reinforcing Bars
Annex A9
Procedure for Use and Control of Heat-cycle Simulation
Annex A10
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 When these test methods are referenced in a metric product specification, the yield and tensile values may be determined in inch-pound (ksi) units then converted into SI (MPa) units. The elongation determined in inch-pound gauge lengths of 2 in. or 8 in. may be report...
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Standards Content (Sample)
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.
Designation: A370 − 24
Standard Test Methods and Definitions for
1
Mechanical Testing of Steel Products
This standard is issued under the fixed designation A370; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
Testing Multi-Wire Strand Annex A7
Rounding of Test Data Annex A8
2
1.1 These test methods cover procedures and definitions
Methods for Testing Steel Reinforcing Bars Annex A9
for the mechanical testing of steels, stainless steels, and related Procedure for Use and Control of Heat-cycle Simulation Annex A10
alloys. The various mechanical tests herein described are used
1.4 The values stated in inch-pound units are to be regarded
to determine properties required in the product specifications.
as standard. The values given in parentheses are mathematical
Variations in testing methods are to be avoided, and standard
conversions to SI units that are provided for information only
methods of testing are to be followed to obtain reproducible
and are not considered standard.
and comparable results. In those cases in which the testing
1.5 When these test methods are referenced in a metric
requirements for certain products are unique or at variance with
these general procedures, the product specification testing product specification, the yield and tensile values may be
requirements shall control. determined in inch-pound (ksi) units then converted into SI
(MPa) units. The elongation determined in inch-pound gauge
1.2 The following mechanical tests are described:
lengths of 2 in. or 8 in. may be reported in SI unit gauge
Sections
lengths of 50 mm or 200 mm, respectively, as applicable.
Tension 7 to 14
Bend 15
Conversely, when these test methods are referenced in an
Hardness 16
inch-pound product specification, the yield and tensile values
Brinell 17
Rockwell 18 may be determined in SI units then converted into inch-pound
Portable 19
units. The elongation determined in SI unit gauge lengths of
Impact 20 to 30
50 mm or 200 mm may be reported in inch-pound gauge
Keywords 32
lengths of 2 in. or 8 in., respectively, as applicable.
1.3 Annexes covering details peculiar to certain products
1.5.1 The specimen used to determine the original units
are appended to these test methods as follows:
must conform to the applicable tolerances of the original unit
Annex
Bar Products Annex A1 system given in the dimension table not that of the converted
Tubular Products Annex A2
tolerance dimensions.
Fasteners Annex A3
Round Wire Products Annex A4
NOTE 1—This is due to the specimen SI dimensions and tolerances
Significance of Notched-Bar Impact Testing Annex A5
being hard conversions when this is not a dual standard. The user is
Converting Percentage Elongation of Round Specimens to Annex A6
directed to Test Methods A1058 if the tests are required in SI units.
Equivalents for Flat Specimens
1.6 Attention is directed to ISO/IEC 17025 when there may
be a need for information on criteria for evaluation of testing
laboratories.
1.7 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 appro-
priate safety, health, and environmental practices and deter-
1
These test methods and definitions are under the jurisdiction of ASTM
mine the applicability of regulatory limitations prior to use.
Committee A01 on Steel, Stainless Steel and Related Alloys and are the direct
1.8 This international standard was developed in accor-
responsibility of Subcommittee A01.13 on Mechanical and Chemical Testing and
dance with internationally recognized principles on standard-
Processing Methods of Steel Products and Processes.
Current edition approved March 1, 2024. Published April 2024. Originally
ization established in the Decision on Principles for the
approved in 1953. Last previous edition approved in 2023 as A370 – 23. DOI:
Development of International Standards, Guides and Recom-
10.1520/A0370-24.
2
mendations issued by the World Trade Organization Technical
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA-370 in Section II of that Code. Barriers to Trade (TBT) Committee.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
...
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: A370 − 23 A370 − 24
Standard Test Methods and Definitions for
1
Mechanical Testing of Steel Products
This standard is issued under the fixed designation A370; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
2
1.1 These test methods cover procedures and definitions for the mechanical testing of steels, stainless steels, and related alloys.
The various mechanical tests herein described are used to determine properties required in the product specifications. Variations
in testing methods are to be avoided, and standard methods of testing are to be followed to obtain reproducible and comparable
results. In those cases in which the testing requirements for certain products are unique or at variance with these general
procedures, the product specification testing requirements shall control.
1.2 The following mechanical tests are described:
Sections
Tension 7 to 14
Bend 15
Hardness 16
Brinell 17
Rockwell 18
Portable 19
Impact 20 to 30
Keywords 32
1.3 Annexes covering details peculiar to certain products are appended to these test methods as follows:
Annex
Bar Products Annex A1
Tubular Products Annex A2
Fasteners Annex A3
Round Wire Products Annex A4
Significance of Notched-Bar Impact Testing Annex A5
Converting Percentage Elongation of Round Specimens to Annex A6
Equivalents for Flat Specimens
1
These test methods and definitions are under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and are the direct responsibility of
Subcommittee A01.13 on Mechanical and Chemical Testing and Processing Methods of Steel Products and Processes.
Current edition approved Sept. 15, 2023March 1, 2024. Published September 2023April 2024. Originally approved in 1953. Last previous edition approved in 20222023
as A370 – 22.A370 – 23. DOI: 10.1520/A0370-23.10.1520/A0370-24.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-370 in Section II of that Code.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A370 − 24
Testing Multi-Wire Strand Annex A7
Rounding of Test Data Annex A8
Methods for Testing Steel Reinforcing Bars Annex A9
Procedure for Use and Control of Heat-cycle Simulation Annex A10
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 When these test methods are referenced in a metric product specification, the yield and tensile values may be determined in
inch-pound (ksi) units then converted into SI (MPa) units. The elongation determined in inch-pound gauge lengths of 2 in. or 8 in.
may be reported in SI unit gauge lengths of 50 mm or 200 mm, respectively, as applicable. Conversely, when these test methods
are referenced in an inch-pound product specification, the yield and tensile values may be determined in SI units then converted
into inch-pound units. The elongation determined in SI unit gauge lengths of 50 mm or 200 mm may be reported in inch-pound
gauge lengths of 2 in. or 8 in., respectively, as applicable.
1.5.1 The specimen used to determine the original units must conform to the applicable tolerances of the original unit system given
in the dimension table not that of the converted tolerance dimensions.
NOTE 1—This is due to the specimen SI dimensions and tolerances being hard conversions when this is not a dual standard. The user is directed to Test
Methods A1058 if the tests are required in SI units.
1.6 Attention is directed to ISO/IEC 17025 when there may be a need for information on criteria for evaluation of testing
laboratories.
1.7 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.8 This international standard was developed in accordance with internation
...
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