ASTM A802 PDF
ASTM A/AM: Standard Practice for Steel Castings, Surface Acceptance Standards, Visual Examination. 55, ASTM A, BNIF , and GAR C9 Comparator, among others . Inspectors use comparators and images in these methods to visually classify the . Designation: A /A M – 95 (Reapproved ) An American National Standard. Standard Practice for. Steel Castings, Surface Acceptance Standards, .
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Current edition approved Sept.
Wrinkles result from irregularities of the liquid metal? It should assist in avoiding misunderstanding arising from imprecise descriptions at the order stage and should also help in defining a surface that is amendable to a particular techniques asmt non-destructive testing. Ceroxides consist of a mixture of low-melting oxides and partially fused sand.
The object of this standard is to facilitate cooperation between founder and casting purchaser in determining the surface conditions, and quality level required.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Originally published as A — This practice covers the standard acceptance criteria for the determination of surface texture, surface roughness, and surface discontinuities of steel castings by visual examination.
Steel Castings, Surface Acceptance Standards. Brackets may be removed or allowed to remain on the casting. Finer marks are produced with the abrasive cut-off wheel and grinding. The object of this standard is to facilitate cooperation between founder and casting purchaser in determining the surface conditions, and quality level required. Surface Texture – the natural surface of the casting after shot blasting.
Brackets are produced by providing suitable cavities in the mold or core. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense. The use of the comparators is superior to methods based on photographs which can introduce uncertainties concerning interpretation, particularly with regards o the depth of surface irregularities. Metal Removal Marks Mechanical Dressing – surface remaining after using a mechanical means of dressing a cast surface or a previously thermally dressed surface.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Surface discontinuities left by these inclusions are referred to by the inclusion type that caused their formation: The comparator can also be used as the standard of quality inspection.
Surface Texture — the natural satm of the casting after shot blasting. Expansion Discontinuities — slightly raised surface irregularities. Level A for surface texture, Level W802 for nonmetallic inclusions, Level C for gas porosity, Level D for solidification discontinuities, Level E for sand expansion discontinuities, Level F for metal inserts, Q802 G for thermally cut surfaces, Level H for mechanically prepared surfaces, and A82 J for welded surfaces.
Fusion Discontinuities — surface irregularities giving a wrinkled appearance. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Four levels of acceptance standards are provided. A number in parentheses indicates the year of last reapproval. Four levels of acceptance standards are provided. Inserts – indications of chaplets sand core supports or internal chills. Brackets have the same purpose but represent an integral part of the casting. The resulting casting appearance is characterized by rounded edges, for a mild degree of misrun.
ASTM A802 PDF
Non-Metallic Inclusions — Non-metallic material trapped on the surface of castings. This abstract is a brief summary of the referenced standard. Brackets merely change the casting appearance due to their presence. Inserts — indications of chaplets sand core supports or a80 chills.
ASTM A(Reapproved )_百度文库
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. It is informational only and not an official part of the q802 the full text of the standard itself must be referred to for its use and application. They develop due to low temperature, unfavorable?
Low liquid metal temperature and unfavorable? Sometimes, a scab consists of a raised, rough area of essentially solid metal on the surface of a casting. Frequently, misruns are associated with such discontinuities as wrinkles satm laps and folds, or both.
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.
External chills may produce? It is the responsibility of asmt user of this standard to establish appropriate x802 and health practices and determine the applicability of regulatory limitations prior to use. They differ by a more rounded appearance of the depression and do not exhibit the crater-like appearance of ceroxides. Metal Removal Marks Mechanical Dressing — surface remaining after using a mechanical means of dressing a cast surface or a previously thermally dressed surface.
Asym 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. Work Item s – proposed revisions of this standard.