AMS Resource, Inc. - Alloy, Metal & Steel Supplier

A-193 Alloy-Steel & Stainless Steel Bolting Material for High-Temperature Service


This specification covers alloy steel and stainless steel bolting material for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. Ferritic steels shall be properly heat treated as best suits the high temperature characteristics of each grade. Immediately after rolling or forging, the bolting material shall be allowed to cool to a temperature below the cooling transformation range. The chemical composition requirements for each alloy are presented in details. The steel shall not contain an unspecified element for ordered grade to the extent that the steel conforms to the requirements of another grade for which that element is a specified element. The tensile property and hardness property requirements are discussed, the tensile property requirement is highlighted by a full size fasteners, wedge tensile testing.


Used for bolting applications. Fasteners, Bolts, Valves, Fittings


A-193 Alloy-Steel & Stainless Steel Bolting Material for High-Temperature Service

Ferritic Alloy & Stainless Steel Grades
B5 (501), B6 (410), B6X, B7 (4140/42), B7M, B16,

Austenitic Stainless Steel Grades
B8, B8A (304), B8C, B8CA (347), B8M, B8MA, B8M2, B8M3 (316), B8P, B8PA (S30500) B8N, B8NA (304N), B8MN, B8MNA (316N), B8MLCuN, B8MLCuNA (S31254), B8T, B8TA (321), B8R, B8RA (S20910 Nitronic® 50), B8S (Nitronic® 60), B8SA (S21800), B8LN, B8LNA (S30453), B8MLN, B8MLNA (S31653),

Available Forms

  • Bar
  • Fittings & Flanges
  • Forge
  • Valves