This specification covers the standard for martensitic stainless steel for various structural, architectural, pressure vessel, and heat-resisting applications. The material shall undergo heat-treatment by tempering. The steel shall conform to the requirements as to chemical composition specified for carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, and nitrogen. Mechanical testing shall be performed on the steel and shall conform to the specified values in mechanical properties such as yield strength, tensile strength, elongation, and Brinell hardness.

1.1 This specification covers martensitic stainless steels for various structural, architectural, pressure vessel, and heat-resisting applications. The mechanical properties of these steels are customarily, but not necessarily, developed by a suitable heat treatment generally referred to as tempering.

1.2 Steel products under this specification are available in two grades:

Grade

Yield Strength, min, ksi [MPa]

40 [275]

40 [275]

50 [345]

50 [345]

1.3 The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements; however, current practice normally limits the maximum thickness of plates furnished under this specification to 2 in. [50 mm].

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.