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ASTM A957/A957M-18a

ASTM A957/A957M-18a

Standard Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use

2020-07-31 /Historical
Superseeded by:

This specification covers a group of requirements that are mandatory for castings produced by the investment casting process to meet the metallurgical requirements of the following steel casting specifications. Chemical, heat, and product analyses shall be performed wherein the material shall meet the specified composition limits for carbon, manganese, silicon, phosphorus, sulfur, nickel, chromium, molybdenum, vanadium, tungsten, copper, and aluminum. The specified design and dimensions of the ICI test bar shall be employed only for austenitic alloy castings. The material shall conform to mechanical properties including tension test requirements.


1.1 This specification covers a group of requirements that are mandatory for castings produced by the investment casting process to meet the metallurgical requirements of the following steel casting specifications issued by ASTM.

ASTM Designation

Title of Specification


Steel Castings, Carbon, for General Application


Steel Castings, Austenitic Manganese


Steel Castings, High-Strength, for Structural Purposes


Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat-Resistant, for General Application


Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class), for High-Temperature Service


Castings, Nickel and Nickel Alloy


Castings, Chromium-Nickel Alloy


Castings, Investment, Carbon and Low-Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures


Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion-Resistant, for General Application


Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service


Steel Castings, Stainless, Precipitation Hardening


Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General Application


Steel Castings, Carbon and Alloy, Chemical Requirements Similar to Standard Wrought Grades


Steel Castings, Carbon and Alloy, with Tensile Requirements, Chemical Requirements Similar to Standard Wrought Grades


Castings, Nickel-Aluminum Ordered Alloy

1.2 This specification also covers a group of supplementary requirements that may be applied to the above specifications as indicated therein. These are provided for use when additional testing or inspection is desired, and apply only when specified individually by the purchaser in the order.

1.3 When investment castings are ordered, the requirements stated in this specification form an integral part of the material specification. In cases of conflict, the requirements of this specification shall take precedence over the individual material specification requirements.

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 nonconformance 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.

casting; investment casting; master heat; steel; sub-heat;
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