ASTM A193 Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service

ASTM A193 covers alloy and stainless steel bolting material for pressure vessels, valves, flanges, and fittings
for high-temperature service.The term bolting material as used in this specification covers bars, bolts, screws, studs, stud bolts, and wire. Bars and wire shall be hot-wrought. The material may be further processed by centerless grinding or by cold rawing. Austenitic stainless steel may be carbide solution treated or carbide solution treated and strain-hardened. When strain hardened austenitic steel is ordered, the purchaser should take special care to ensure that Appendix X1 of this standard is thoroughly understood.

Grades and UNS Designationin in ASTM A193

Ferritic Steels
B5  5% Chromium
B6 and B6X 12% Chromium
B7, B7M  Chromium-Molybdenum
B16  Chromium-Molybdenum-Vanadium

Austenitic Steels
B8, B8A  S30400 (304)
B8C, B8CA  S34700 (347)
B8M, B8MA, B8M2, B8M3  S31600 (316)
B8P, B8PA  S30500
B8N, B8NA  S30451 (304N)
B8MN, B8MNA  S31651 (316N)
B8MLCuN, B8MLCuNA  S31254
B8T, B8TA  S32100 (321)
B8R, B8RA  S20910
B8S, B8SA  S21800
B8LN, B8LNA  S30453
B8MLN, B8MLNA  S31653