ASTM A802 PDF
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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Gas Porosity — Indications of gas t the casing surface. The crater-like appearance of the casting surface depression is typical. 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 astj testing.
ASTM A802 PDF
Brackets merely change the casting appearance due to their presence. This standard has been approved for use by agencies of the Department of Defense. Brackets have the same purpose but represent an integral part of the casting. Surface discontinuities left by these inclusions are referred to by the inclusion type that caused their formation: The object of this standard is to facilitate cooperation between founder and casting purchaser in determining the surface conditions, and quality level required.
Four levels of acceptance standards are provided. 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. The resulting casting appearance is characterized by rounded edges, for a mild degree of misrun. Inserts – indications of chaplets sand core supports or internal chills. The object of this standard is to facilitate cooperation between founder and casting purchaser in determining the surface conditions, and quality level required.
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. Metal Removal Marks Mechanical Dressing. Ceroxides consist of a mixture of low-melting oxides and partially fused sand.
Causes are improper closing of the mold, insufficient weighting or clamping of the mold for pouring, or uneven pattern surfaces at the matching locations. 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.
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.
ASTM International takes no position respecting the validity of any patent rights asserted in z802 with any item mentioned in this standard. This practice covers the standard a820 criteria for the determination of surface texture, surface roughness, and surface discontinuities of steel castings by visual examination. Low liquid metal temperature and unfavorable? Link to Active This link will always route to the current Active version of the standard.
Surface Texture — the natural satm of the casting after shot blasting. Metal Removal Marks Mechanical Dressing — surface remaining after using a mechanical means of dressing a cast surface or a previously thermally dressed surface.
Visual Inspection Acceptance Criteria.
ASTM A(Reapproved )_百度文库
Four levels of acceptance standards are provided. Their appearance may, at times, more closely re? Frequently, misruns are associated with such discontinuities as wrinkles or laps and folds, or both. Metal Removal Marks Mechanical Dressing. Expansion Discontinuities — slightly raised surface irregularities. Inserts — indications of chaplets sand core supports or internal chills. Surface Texture – the natural surface of the casting after shot blasting.
Fusion Discontinuities – surface irregularities giving a wrinkled appearance. Non-Metallic Inclusions — Non-metallic material trapped on aa802 surface of castings.
Riser removal and machining may reveal shrinkage that extends from the interior of the casting to the near surface area.