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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Four levels q802 acceptance standards are provided. The casting designer and purchasers can denote the level one to four on the drawings as the requirements of surface quality, then the founder, Dandong Foundry, will check the photos, and learn about the requirements. Historical Version s — view previous versions of standard.

Irregular, malformed edges of more severe misruns, and not fully formed castings, are characteristic. Expansion Discontinuities — slightly raised surface irregularities. The object of this standard is to facilitate cooperation between founder and casting purchaser in determining the surface conditions, and quality level required.

The crater-like xstm of the casting surface depression is typical.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. 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, aztm with regards o the depth of surface irregularities.

Inserts — indications of chaplets sand core supports or internal chills. Gas Porosity – Indications of gas t the casing surface. Current edition approved Sept. External chills may produce? Metal Removal Marks Mechanical Dressing. Expansion Discontinuities – slightly adtm surface irregularities. Visual Inspection Acceptance Criteria.

ASTM A(Reapproved )_百度文库

Low liquid metal temperature and unfavorable? The casting designer and purchasers can denote the level one to four on the drawings as the requirements of surface quality, then a80 founder, Dandong Foundry, will check the photos, and learn about the requirements. Metal Removal Marks Thermal Dressing. Rat tails form as a result of sand expansion and minor buckling of the mold surface during? Steel Castings, Surface Acceptance Standards. It should assist in avoiding misunderstanding arising from imprecise descriptions at the order stage and should also help in defining aastm surface that is amendable to a particular techniques of non-destructive testing.

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Surface Texture — the natural satm of the casting after shot blasting. 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. ASTM does not give any warranty express atm implied or make any representation that the contents of this abstract are accurate, complete aetm up to date. Metal Removal Marks Thermal Dressing. The resulting casting appearance is characterized by rounded edges, for a mild degree of misrun.

Historical Version s – view previous versions of standard. Fusion Discontinuities — surface irregularities giving a wrinkled appearance. Brackets may be removed or allowed to remain on the casting. Metal Removal Marks Welds — indications of welds fully or partially removed by thermal or mechanical dressing. 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.

The object of this standard is to facilitate cooperation between founder and casting purchaser in determining the surface conditions, and quality level required. Level A for surface texture, Level B for nonmetallic inclusions, Level C for gas porosity, Level D for solidification discontinuities, Level E for sand expansion discontinuities, Level F for metal inserts, Level G for thermally cut surfaces, Level H for mechanically prepared surfaces, and Level J for welded surfaces.

Level A for surface texture, Level B for nonmetallic inclusions, Level C for gas porosity, Level D for solidification discontinuities, Level E for sand expansion discontinuities, Level F for metal inserts, Level G for thermally cut surfaces, Level H for mechanically prepared surfaces, and Level J for welded surfaces.

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Wrinkles result from irregularities of the liquid metal? Riser removal and machining may reveal shrinkage that extends from the interior of the casting to the near surface area.

Visual Inspection Acceptance Criteria. Finer marks are produced with the abrasive cut-off wheel and grinding. 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. The comparator can also be used as the standard of quality inspection.

They differ by a more rounded appearance of the depression and do not z802 the crater-like appearance of ceroxides. Inserts – indications of chaplets sand core supports or internal chills. Fusion Discontinuities – surface irregularities giving a wrinkled appearance. A number in parentheses indicates the year of last reapproval. Four levels of acceptance standards are provided.

ASTM A802 PDF

Surface discontinuities left by these inclusions are referred w802 by the inclusion type that caused their formation: Your comments are aa802 either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

Astk standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Non-Metallic Inclusions — Non-metallic material trapped on the surface of castings. 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. Metal Removal Marks Mechanical Dressing – surface remaining after using a mechanical means of dressing a cast surface or a previously thermally dressed surface.

This abstract is a brief summary of the referenced standard.