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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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. This practice covers the standard acceptance criteria for the determination of surface texture, surface roughness, and surface discontinuities of steel castings by visual examination. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
The comparator can also be used as the standard of quality inspection.
Metal Removal Marks Mechanical Dressing. Non-Metallic Inclusions – Non-metallic material trapped on the surface of castings. 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. Ceroxides consist of a mixture of low-melting oxides and partially fused sand.
ASTM A(Reapproved )_百度文库
Gas Porosity – Indications of gas t the casing surface. 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 Welds — indications of welds fully or partially removed by thermal or mechanical dressing.
This standard has been approved for use by agencies of the Department of Defense. If you feel that your comments have not received a fair hearing you should make aatm views known to the ASTM Committee on Standards, at the address shown below. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Four levels of acceptance standards are provided.
Steel Castings, Surface Acceptance Standards. Metal Removal Marks Mechanical Dressing – surface remaining after using a mechanical means of dressing a cast surface or a previously thermally dressed surface. Level A for surface texture, Level B for nonmetallic inclusions, Level C for gas porosity, Level D for solidification discontinuities, Level E for sand s802 discontinuities, Level F for metal inserts, Level Awtm for thermally cut surfaces, Level H for mechanically prepared surfaces, and Level J for welded surfaces.
The crater-like appearance of the casting surface depression is typical. Finer marks are produced with the abrasive cut-off wheel and grinding. Visual Inspection Acceptance Criteria. Riser removal and machining may reveal shrinkage that extends from the interior of the casting to the near surface area.
Metal Removal Marks Welds – indications of welds fully or partially removed by thermal or mechanical dressing. Inserts – indications of chaplets sand core supports or internal chills.
A number in parentheses indicates the year of last reapproval. Brackets have the same purpose but represent an integral part of the casting.
Fusion Discontinuities – surface irregularities giving a wrinkled appearance. Sometimes, a scab consists of a raised, rough area of essentially solid metal on the surface of a casting.
Rat tails form as a result of sand expansion and minor buckling of the mold surface during? Brackets are produced by providing suitable cavities in the mold or core. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Gas Porosity — Indications of gas t the casing surface. This practice covers the standard acceptance criteria for the determination of surface texture, surface roughness, and surface discontinuities of steel castings by visual examination. Originally published as A — 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 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.
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. Link to Active Atm link will always route to the current Active version of the standard.
Metal Removal Marks Mechanical Dressing. They develop due to low temperature, unfavorable? Non-Metallic Inclusions — Non-metallic material trapped on the surface of castings.
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. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Expansion Discontinuities – slightly raised surface irregularities.
ASTM A802 PDF
Incomplete fusion due to low liquid steel temperatures and prevailing? Expansion Discontinuities — slightly raised surface irregularities.
Historical Version s – view previous versions of standard. Visual Inspection Acceptance Criteria. Metal Removal Marks Thermal Dressing.
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. This abstract is a brief summary of the referenced standard. Their appearance may, at times, more closely re?
Brackets merely change the casting appearance aatm to their presence. 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.