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  ASTM A193/A193M Fasteners for High-Temperature and High-Pressure Service

  ASTM A193/A193M The standard classifies various material grades: ferritic heat-resistant steels (such as B5, B6, B7, and B16) are suitable for medium-to-high-temperature pressure applications, while austenitic stainless steels (such as B8 and B8M) are suited for corrosive, high-temperature environments. The specification strictly defines chemical composition, tensile strength, yield strength, and hardness limits for each grade; it mandates full-size wedge tensile testing to verify mechanical properties and imposes strict controls on harmful impurities and unspecified alloying elements.

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