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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Surface discontinuities left by these inclusions are referred to by the inclusion type that caused their formation: 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 of non-destructive testing. Brackets merely change the casting appearance due to their presence.
Non-Metallic Inclusions — Non-metallic material trapped on the surface of castings. Current edition approved Sept. Frequently, misruns are associated with such discontinuities as wrinkles or laps and folds, or both. Their appearance may, at times, more closely re? 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.
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. Historical Version s — view previous versions of standard.
Inserts – indications of chaplets sand core supports or internal chills. Originally published as A — Link atm Active This link will always route to the current Active version of the standard.
Fusion Discontinuities — surface irregularities giving a wrinkled appearance. This abstract is a brief summary of the referenced standard.
This abstract is a a80 summary of the referenced standard. Expansion Discontinuities – slightly raised surface irregularities. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
ASTM A802 PDF
Metal Removal Marks Thermal Dressing. 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.
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. Fusion Discontinuities – surface irregularities giving a wrinkled appearance. Users of this standard are expressly advised that determination of the validity q802 any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
A number in parentheses indicates the year of last reapproval. 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 of non-destructive testing.
Work Item s – proposed revisions of this standard. Surface Texture – the natural surface of the casting after shot blasting. Four levels of acceptance standards are provided. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The object of this standard is to facilitate cooperation between founder and casting purchaser z802 determining the surface conditions, and quality level required.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Visual Inspection Acceptance Criteria. Riser removal and machining may reveal shrinkage that extends from the interior of the casting to the near surface area.
Finer marks are produced with the abrasive cut-off wheel and grinding. Gas Porosity – Indications of gas t the casing surface. This standard has been approved for use by atsm of the Department of Defense. The resulting casting appearance is characterized by rounded edges, for a mild degree of misrun.
ASTM A(Reapproved )_百度文库
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 exhibit the crater-like appearance of ceroxides.
It is informational only and not an official part of the standard; the a820 text of the standard itself must be referred to for its use and application. Irregular, malformed edges of more severe misruns, and not fully formed castings, are characteristic.
Metal Removal Marks Thermal Dressing. 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. 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. Four levels of acceptance standards are provided. It is the responsibility of the user of this standard to establish appropriate safety and health practices x802 determine the applicability of regulatory limitations prior to use.