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Normas ASTM – AENOR
ASTM A957/A957M-08

ASTM A957/A957M-08

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

Fecha:
2010-12-31 /Historical
Superseeded by:
Abstract:

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.

Scope:

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
A 27/A 27M Steel Castings, Carbon, for General Application
A 148/A 148M Steel Castings, High-Strength, for Structural Purposes
A 297/A 297M Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat-Resistant, for General Application
A 447/A 447M Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class), for High-Temperature Service
A 494/A 494M Castings, Nickel and Nickel Alloy
A 560/A 560M Castings, Chromium-Nickel Alloy
A 732/A 732M Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
A 743/A 743M Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion-Resistant, for General Application
A 744/A 744M Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service
A 747/A 747M Steel Castings, Stainless, Precipitation Hardening
A 890/A 890M Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General Application
A 915/A 915M Steel Castings, Carbon and Alloy, Chemical Requirements Similar to Standard Wrought Grades

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 inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. Inch-pound units are applicable for material ordered to Specification A 957 and SI units for material ordered to Specification A 957M.

Keywords:
casting; investment casting; master heat; steel; sub-heat; Alloy steel castings--specifications; General delivery requirements--steel; Investment castings--specifications; Master heat process; Metallurgical requirements; Sub-heat process
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