ASTM A351: Specification for Castings, Austenitic, for Pressure-Containing Parts

1. Scope*

1.1 ASTM A351 covers austenitic steel castings for valves, flanges, fittings, and other pressure-containing parts (Note 1).

NOTE 1—Carbon steel castings for pressure-containing parts are covered by Specification ASTM A216/A216M, low-alloy steel castings by Specification ASTM A217/A217M, and duplex stainless steel castings by Specification A995/A995M.

1.2 A number of grades of austenitic steel castings are included in this specification. Since these grades possess varying degrees of suitability for service at high temperatures or in corrosive environments, it is the responsibility of the purchaser to determine which grade shall be furnished. Selection will depend on design and service conditions, mechanical properties, and high-temperature or corrosion-resistant characteristics, or both.

1.2.1 Because of thermal instability, Grades CE20N, CF3A, CF3MA, and CF8A are not recommended for service at temperatures above 800 °F 425 °C.

1.3 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. The Supplementary requirements shall apply only when specified individually by the purchaser in the purchase order or contract.

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.

1.4.1This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M-specification designation (SI units), the inch-pound units shall apply. Within the text, the SI units are shown in brackets or parentheses.

1.5This 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.

Chemical Requirement

Note
A - Grade CF8C shall have a columbium (niobium) content of not less than 8 times the carbon content but not over 1.00 %.
B - Grade CF10MC shall have a columbium (niobium) content of not less than 10 times the carbon content but not over 1.20 %.
C - Grade HG10MnN shall have a columbium (niobium) content of not less than 8 times the carbon, but not over 1.00 %.
D - Columbium (Cb) and niobium (Nb) are alternate names for Element 41

Physic Requirements (Tensile)

A - Determine by the 0.2 % offset method.
B - When ICI test bars are used in tensile testing as provided for in Specification A995/A995M, the gauge length to reduced section diameter ratio shall be 4 to 1.