《ASME SA-420 低温用锻制碳钢和合金钢管配件》.pdf

Designation: A 420/A 420M – 05 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service1 This standard is issued under the fixed designation A 420/A 420M; 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 (e) indicates an editorial change since the last revision or reapproval. 1. Scope* A 960/A 960M Specification for Common Requirements 1.1 This specification2 covers wrought carbon steel and for Wrought Steel Piping Fittings alloy steel fittings of seamless and welded construction, cov- 2.3 ASME Standards: B 16.9 Factory-Made Wrought Steel Butt-Welding Fittings4 ered by the latest revision of ASME B 16.9, ASME B 16.11, B 16.11 Forged Steel Fittings, Socket-Welding Threaded4 MSS-SP-79, and MSS SP-95. Fittings differing from these ASME and MSSVF standards shall be furnished in accordance Section VIII Division 1, Pressure Vessels4 with Supplementary Requirement S58 of Specification A 960/ Section IX Welding Qualifications A 960M. These fittings are for use in pressure piping and 2.4 MSS Standards: pressure vessel service at low temperatures. MSS SP-25 Standard Marking System for Valves, Fittings, 1.2 Optional supplementary requirements are provided for