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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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 w802 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. Four levels of acceptance standards are provided. Frequently, misruns are associated with such discontinuities as wrinkles or laps and folds, or both. 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.
Wstm object of this standard is to facilitate cooperation between founder and casting purchaser in determining the surface conditions, and quality level required. Brackets merely change the casting appearance due to their presence. This practice covers the standard acceptance criteria for the determination of surface texture, surface roughness, and surface discontinuities of steel castings by visual examination. 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 Thermal Dressing. A02 – indications of chaplets sand core supports or internal chills. The comparator can also be used as the standard of quality inspection. 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.
ASTM A(Reapproved )_百度文库
Visual Inspection Acceptance Criteria. Riser removal and machining may reveal shrinkage that extends from the interior of the casting to the near surface area.
Link to Active This link will always route to the current Active version of the standard. 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. Your astk will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
External chills may produce? Their appearance may, at times, more closely re? Link to Active Atm link will always route to the current Active version of the standard. 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.
Level A for surface texture, Level B for nonmetallic inclusions, Level C for gas porosity, Level D for solidification discontinuities, Level E for sand zstm discontinuities, Level F for metal inserts, Level G for thermally cut surfaces, Level H for mechanically prepared surfaces, and Level J for welded surfaces.
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. 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. 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.
They differ asm a more rounded appearance of the depression and do not exhibit the crater-like appearance of ceroxides. This abstract is a brief summary of the referenced standard. Wrinkles result from irregularities of the liquid metal? Non-Metallic Inclusions — Non-metallic material trapped on the surface of castings.
Users of this axtm 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. Surface discontinuities left by these inclusions are referred to by the inclusion type that caused their formation: Fusion Discontinuities — surface irregularities giving a wrinkled appearance.
Historical Version s – view previous versions of standard.
Metal Removal Marks Welds — indications of welds fully or partially removed by thermal or mechanical dressing. Incomplete fusion due to low liquid steel temperatures and prevailing?
Visual Inspection Acceptance Criteria. Surface Satm – the natural surface of the casting after shot blasting. Rat tails form as a result of sand expansion and minor buckling of the mold surface during? They develop due to low temperature, unfavorable? Metal Removal Marks Thermal Dressing.
Work Item s – proposed revisions of this standard. Originally published as A — Metal Removal Marks Mechanical Dressing — surface remaining after using a mechanical means of dressing a cast surface or a previously thermally dressed surface.
ASTM A802 PDF
Metal Removal Marks Mechanical Dressing – surface remaining after using a mechanical means of dressing a cast surface or a previously asstm dressed surface. Fusion Discontinuities – surface irregularities aastm a wrinkled appearance. The resulting casting appearance is characterized by rounded edges, for a mild degree of misrun. Irregular, malformed edges of more severe misruns, and not fully formed castings, are characteristic.
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Finer marks are produced with the abrasive cut-off wheel and grinding. 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. Gas Porosity – Indications of gas t the casing surface.
Steel Castings, Surface Acceptance Standards.