ASTM A997-08
(Practice)Standard Practice for Investment Castings, Surface Acceptance Standards, Visual Examination
Standard Practice for Investment Castings, Surface Acceptance Standards, Visual Examination
ABSTRACT
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.
SCOPE
1.1 This practice covers the acceptance criteria for surface inspection of investment castings by visual examination.
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.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A997 − 08
StandardPractice for
Investment Castings, Surface Acceptance Standards, Visual
1
Examination
This standard is issued under the fixed designation A997; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2.1.3 surface pit, n—a non linear depression in the cast
surface whose length is less than three times its width. Surface
1.1 This practice covers the acceptance criteria for surface
pits may be the result of gas or non metallic inclusions.
inspection of investment castings by visual examination.
2.1.4 surface roughness, n—a measure of surface texture
1.2 The values stated in inch-pound units are to be regarded
usually determined by the use of a comparator.
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3. Ordering Information
and are not considered standard.
3.1 The inquiry or order should specify the following
1.3 This standard does not purport to address all of the
information:
safety concerns, if any, associated with its use. It is the
3.1.1 Acceptance Level—More than one acceptance level
responsibility of the user of this standard to establish appro-
may be specified for different surfaces of the same casting (see
priate safety and health practices and determine the applica-
Section 4),
bility of regulatory limitations prior to use.
3.1.2 If any types of discontinuities are unacceptable,
3.1.3 Casting surfaces to be examined,
2. Terminology
3.1.4 Number of castings to be examined, and
2.1 Definitions of Terms Specific to This Standard:
3.1.5 Additional acceptance criteria as applicable to all or
2.1.1 linear discontinuity, n—a discontinuity whose length
portions of the casting surface.
is equal to or greater than three times its width. Cracks and cold
shuts are examples of linear discontinuity.
4. Acceptance Criteria
2.1.2 positive metal, n—raised metal on the casting surface
4.1 Levels of acceptance for visual inspection are listed in
usually associated with the breakdown of the mold and its
Table 1.
replacement with the casting metal.
4.2 Parts shall not exhibit any linear discontinuities.
4.3 Surface roughness and surface pits that will be removed
1
This practice is under the jurisdiction of ASTM Committee A01 on Steel,
by machining are considered acceptable.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
4.4 Surface discontinuities not covered in this practice shall
Current edition approved Nov. 1, 2008. Published December 2008. Originally
be a matter of agreement between the purchaser and the
approved in 1998. Last previous edition approved in 2007 as A997 – 07. DOI:
10.1520/A0997-08. manufacturer.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:A997–07 Designation: A 997 – 08
Standard Practice for
Investment Castings, Surface Acceptance Standards, Visual
1
Examination
This standard is issued under the fixed designation A 997; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This practice covers the acceptance criteria for surface inspection of investment castings by visual examination.
1.2The values stated in SI units are to be regarded as the standard.
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.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Terminology
2.1 Definitions of Terms Specific to This Standard:
2.1.1 linear discontinuity, n—a discontinuity whose length is equal to or greater than three times its width. Cracks and cold
shuts are examples of linear discontinuity.
2.1.2 positive metal, n—raised metal on the casting surface usually associated with the breakdown of the mold and its
replacement with the casting metal.
2.1.3 surface pit, n—a non linear depression in the cast surface whose length is less than three times its width. Surface pits may
be the result of gas or non metallic inclusions.
2.1.4 surface roughness, n—a measure of surface texture usually determined by the use of a comparator.
3. Ordering Information
3.1 The inquiry or order should specify the following information:
3.1.1 Acceptance Level—More than one acceptance level may be specified for different surfaces of the same casting (see
Section 4),
3.1.2 If any types of discontinuities are unacceptable,
3.1.3 Casting surfaces to be examined,
3.1.4 Number of castings to be examined, and
3.1.5 Additional acceptance criteria as applicable to all or portions of the casting surface.
4. Acceptance Criteria
4.1 Levels of acceptance for visual inspection are listed in Table 1.
4.2 Parts shall not exhibit any linear discontinuities.
4.3 Surface roughness and surface pits that will be removed by machining are considered acceptable.
4.4 Surface discontinuities not covered in this practice shall be a matter of agreement between the purchaser and the
manufacturer.
1
This practice is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.18
on Castings.
´1
Current edition approved March 1, 2007. Published March 2007. Originally approved in 1998. Last previous edition approved in 2003 as A997–98(2003) .
Current edition approved Nov. 1, 2008. Published December 2008. Originally approved in 1998. Last previous
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