Active Standard ASTM A997 | Developed by Subcommittee: A01.18
Book of Standards Volume: 01.02
Historical (view previous versions of standard)
This practice covers the acceptance criteria for surface inspection of investment castings through visual examination. The material shall conform to Levels II, III, and IV acceptance criteria for features of surface pits, positive metal, parting line and ejector pin marks, gate height, and surface roughness. The material shall be free of any linear discontinuity.
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1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
ICS Number Code 77.040.20 (Non-destructive testing of metals)