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Designation: A 370 – 97a

An American National Standard

Standard Test Methods and Definitions for

Mechanical Testing of Steel Products1

This standard is issued under the fixed designation A 370; 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 lastreapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.

1. Scope 1.1 These test methods2 cover procedures and definitions for the mechanical testing of wrought and cast steel products. The various mechanical tests herein described are used to determine propertiesrequired 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 where 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 mechanicaltests are described:
Tension Bend Hardness Brinell Rockwell Portable Impact Keywords Sections 5 to 13 14 15 16 17 18 19 to 28 29

inch-pound (ksi) units then converted into SI (MPa) units. The elongation determined in inch-pound gage lengths of 2 or 8 in. may be reported in SI unit gage lengths of 50 or 200 mm, respectively, as applicable. Conversely, when this document is referenced in aninch-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 gage lengths of 50 or 200 mm may be reported in inch-pound gage lengths of 2 or 8 in., respectively, as applicable. 1.6 Attention is directed to Practices A 880 and E 1595 when there may be a need for information on criteria forevaluation 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 and health practices and determine the applicability of regulatory limitations prior to use. 2. Referenced Documents 2.1 ASTM Standards: A 703/A 703M Specification for SteelCastings, General Requirements, for Pressure-Containing Parts3 A 781/A 781M Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use3 A 833 Practice for Indentation Hardness of Metallic Materials by Comparison Hardness Testers4 A 880 Practice for Criteria for Use in Evaluation of Testing Laboratories and Organizations for Examination and Inspection of Steel, StainlessSteel, and Related Alloys5 E 4 Practices for Force Verification of Testing Machines6 E 6 Terminology Relating to Methods of Mechanical Testing6 E 8 Test Methods for Tension Testing of Metallic Materials6 E 8M Test Methods for Tension Testing of Metallic Materials [Metric]6 E 10 Test Method for Brinell Hardness of Metallic Materials6 E 18 Test Methods for Rockwell Hardness and Rockwell
3 4 5

1.3Annexes covering details peculiar to certain products are appended to these test methods as follows:
Bar Products Tubular Products Fasteners Round Wire Products Significance of Notched-Bar Impact Testing Converting Percentage Elongation of Round Specimens to Equivalents for Flat Specimens Testing Multi-Wire Strand Rounding of Test Data Methods for Testing Steel Reinforcing Bars Procedure for Useand Control of Heat-Cycle Simulation Annex 1 2 3 4 5 6 7 8 9 10

1.4 The values stated in inch-pound units are to be regarded as the standard. 1.5 When this document is referenced in a metric product specification, the yield and tensile values may be determined in
1 These test methods and definitions are under the jurisdiction of ASTM Committee A-1 on Steel, Stainless Steel and Related Alloys...