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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This abstract is a brief summary of the referenced standard. Brackets have the same purpose but represent an integral part of the casting. Four levels of acceptance standards are provided.
ASTM A802 PDF
Originally published as A — Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Brackets may be removed or allowed to remain on the casting. Fusion Discontinuities — surface irregularities giving a wrinkled appearance. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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 a8802 previously thermally dressed surface. 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.
Gas Porosity – Indications of gas t the casing surface. Visual Inspection Acceptance Criteria. Metal Removal Marks Mechanical Dressing. Sometimes, a scab consists of a raised, rough area of essentially solid metal on the surface of a casting. Historical Version s — view previous versions z802 standard.
It should assist in avoiding misunderstanding arising from imprecise descriptions at the order stage and should also asrm in defining a surface that is amendable to a particular techniques of non-destructive testing.
Metal Removal Marks Thermal Dressing. Metal Removal Marks Thermal Dressing. Wrinkles result from irregularities of the liquid metal?
ASTM A(Reapproved )_百度文库
Work Item s – proposed revisions of this standard. 8a02 are improper closing of the mold, insufficient weighting or clamping of the mold for pouring, or uneven pattern surfaces at the matching locations. 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 axtm surfaces, and Level J for welded surfaces.
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. This practice covers the standard acceptance criteria for the determination of surface texture, surface roughness, and surface discontinuities of steel castings by visual examination. The resulting casting appearance is characterized by rounded edges, for a mild degree of misrun.
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 comparator can also be used as the standard of quality inspection. Link to Active This link will always 8a02 to the current Active version of the standard.
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.
The comparator can also be used as the standard of quality inspection. They develop due to low temperature, unfavorable? 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.
Expansion Discontinuities – slightly raised surface irregularities. Brackets merely change the casting appearance due to their presence. Metal Removal Marks Mechanical Dressing.
s802 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. 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 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. Sometimes cracks are referred to as cold, hot, or heat treat-cracks to indicate the condition of the castings, or the operation during which the cracks occur.