ASTM-A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products

ASTM-A370 - 2015 EDITION - CURRENT -- See the following: ASTM-A318 ASTM-A330 ASTM-A344 ASTM-A359 ASTM-A443
Show Complete Document History

Document Center Inc. is an authorized dealer of ASTM standards.
The following bibliographic material is provided to assist you with your purchasing decision:

Standard Test Methods and Definitions for Mechanical Testing of Steel Products



Changes from the previous issue

A redline edition is available for this document, with all changes visible. Ask Document Center Inc. for more information.


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:




6 to 14












20 to 29



1.3 Annexes covering details peculiar to certain products are appended to these test methods as follows:



Bar Products


Tubular Products

Annex A2


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 the standard.

1.5 When this document is 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 or 8 in. may be reported in SI unit gauge lengths of 50 or 200 mm, respectively, as applicable. Conversely, when this document is 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 or 200 mm may be reported in inch-pound gauge lengths of 2 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 and health practices and determine the applicability of regulatory limitations prior to use.


Claudia's Notes:
ASTM-A370 test methods center on Ductile vs. Brittle Behavior.  Body-centered-cubic or ferritic alloys exhibit a significant transition in behavior when impact tested over a range of temperatures. At temperatures above transition, impact specimens fracture by a ductile (usually microvoid coalescence) mechanism, absorbing relatively large amounts of energy. At lower temperatures, they fracture in a brittle (usually cleavage) manner absorbing appreciably less energy. Within the transition range, the fracture will generally be a mixture of areas of ductile fracture and brittle fracture.


bend test; Brinell hardness; Charpy impact test; elongation; FATT (Fracture Appearance Transition Temperature); hardness test; portable hardness; reduction of area; Rockwell hardness; tensile strength; tension test; yield strength;; ICS Number Code 77.040.10 (Mechanical testing of metals); 77.140.01 (Iron and steel products in general)

To find similar documents by ASTM Volume:

01.01 (Steel--Piping, Tubing, Fittings)

01.02 (Ferrous Castings; Ferroalloys)

01.03 (Steel--Plate, Sheet, Strip, Wire; Stainless Steel Bar)

01.04 (Steel--Structural, Reinforcing, Pressure Vessel, Railway)

01.05 (Steel--Bars, Forgings, Bearing, Chain, Tool)

To find similar documents by classification:

77.040.10 (Mechanical testing of metals)

77.140.01 (Iron and steel products in general)

This document comes with our free Notification Service, good for the life of the document.

This document is available in either Paper or PDF format.

Document Number


Revision Level




Modification Type


Publication Date

Nov. 15, 2015

Document Type

Test Method

Page Count

50 pages

Committee Number