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ASTM A400-69(2000)

Historical Reaffirmation

Standard Practice for Steel Bars, Selection Guide, Composition, and Mechanical Properties

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1.1 This practice is intended as a guide for the selection of steel bars according to section and to the mechanical properties desired in the part to be produced. This is not a specification for the procurement of steel. Applicable procurement specifications are listed in Section 5.

1.2 Several steel compositions intended for various sections and mechanical property requirements are presented in Tables 2 to 7. The criteria for placing a steel composition in one of the three general class designations, Classes P, Q, and R (described in Section 3) are as follows:

1.2.1 Classes P and Q should be capable of developing the mechanical properties shown in Tables 2 to 5 by liquid quenching from a suitable austenitizing temperature, and tempering at 800°F (427°C) or higher. A hardness indicated by tests made at a location shown in Fig. 1, A, B, or C, is taken as evidence that a composition is capable of meeting other equivalent mechanical properties shown in the tables. Normal good shop practices are assumed, with control of austenitizing and tempering temperatures, and mild agitation of the part in the quenching bath.

1.2.2 Class R should be capable of developing the mechanical properties shown in Tables 6 and 7 as hot rolled, by cold drawing, or by cold drawing with additional thermal treatment. The locations for obtaining tension tests are described in 6.2.

1.3 It is not implied that the compositions listed in the tables are the only ones satisfactory for a certain class and mechanical property requirement. Steels with lower alloy contents are often satisfactory through the use of special processing techniques.


SDO ASTM: ASTM International
Document Number A400
Publication Date Jan. 1, 2000
Language en - English
Page Count 8
Revision Level 69(2000)
Supercedes
Committee A01.15
Publish Date Document Id Type View
Nov. 1, 2023 A0400-23 Revision
Nov. 1, 2017 A0400-17 Revision
March 1, 2012 A0400-69R12 Reaffirmation
March 1, 2006 A0400-69R06 Reaffirmation
Jan. 1, 2000 A0400-69R00 Reaffirmation