A434 热锻或冷精轧经淬火及回火的合金钢棒标准规范.pdf

Designation: A 434 – 90a (Reapproved 2000) Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered1 This standard is issued under the fixed designation A 434; 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 Department of Defense. 1. Scope 3.1.7 Strength class (Section 8 and Table 1), 1.1 This specification covers hot-wrought and cold-finished 3.1.8 Test report, if required (Section 11), quenched and tempered alloy steel bars. 3.1.9 Supplementary Requirements or Special Require- 1.2 Hot-wrought bars are available in three strength level ments, if required, and classes designated BB, BC, and BD, and cold-finished bars in 3.1.10 End use. two strength level classes designated BB and BC. The bars are NOTE 1—A typical ordering description is as follows: 10 000 lb, available in the conditions specified in 4.4 subject to the size Heat-Treated Alloy Steel Bars, Hot Rolled, 1.000 in. diameter 10 ft, limitations shown. ASTM A 434 dated ____, Grade 4140, Class BB, Test Report Required, 1.3 The values stated in inch-pound units are to be regarded Mo