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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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
ASTM A802 PDF
This standard has been approved for use by agencies of the Department of Defense. Four levels of acceptance standards are provided. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations q802 to use. Current edition approved Sept. Originally published as A — Rat tails form as a result of sand expansion and minor buckling of the mold surface during? Sometimes, a scab consists of a raised, rough area of essentially solid metal on the surface of a casting.
Brackets have the same purpose but represent an integral part of the casting.
Brackets are produced by providing suitable cavities in the mold or core. External chills may produce? Brackets merely change the casting appearance due a82 their presence. Brackets may be removed or allowed to remain on the casting. Causes are improper closing of the mold, insufficient weighting or clamping of the mold for pouring, or uneven pattern surfaces at the matching locations.
Wrinkles result from irregularities of the liquid metal? They develop due to low temperature, unfavorable? 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. Frequently, misruns are associated with such discontinuities as wrinkles or laps and folds, or both. Low liquid metal temperature and unfavorable?
Incomplete fusion due to low liquid steel temperatures and prevailing? Sometimes cracks are referred to as cold, hot, or heat treat-cracks to indicate the satm of the castings, or the operation during which the cracks sstm.
ASTM A(Reapproved )_百度文库
Finer marks are produced with the abrasive cut-off wheel and grinding. Surface discontinuities left by these inclusions are referred to by the inclusion type that caused their formation: Ceroxides consist of a mixture of low-melting oxides and partially fused sand. The crater-like appearance of the casting surface depression is typical. They differ by a more rounded appearance of the depression and do not exhibit the crater-like appearance of ceroxides.
Satm appearance may, at times, more closely re? Riser removal and machining may reveal shrinkage that extends from the interior of the casting to the aa802 surface area. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
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.
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