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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 herein 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.
ICS Number Code 77.100 (Ferroalloys)
UNSPSC Code 31101903(Steel investment casting)