《A 320A 320M-03 低温用合金钢螺栓材料标准规范》.pdf

Designation: A 320/A 320M – 03 Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low- Temperature Service1 This standard is issued under the fixed designation A 320/A 320M; 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* 1.3 Nuts for use with this bolting material are covered in 2 covers alloy steel bolting materials Section 9 and the nut material shall be impact tested. 1.1 This specification for pressure vessels, valves, flanges, and fittings for low- 1.4 Supplementary Requirements (S1, S2, and S3) of an temperature service. The term “bolting material” as used in this optional nature are provided. They shall apply only when specification covers rolled, forged, or strain hardened bars, specified in the inquiry, contract and order. bolts, screws, studs, and stud bolts. The bars shall be hot- 1.5 This specification is expressed in both inch-pound units wrought. The material may be further processed by centerless and in SI units. However, unless the order specifies the grinding or by cold drawing. Austenitic stainless steel may be applicable “M” specification designation (SI units), the mate- solution annealed or annea