ASTM A802-19 Standard Practice for Steel Castings, Surface Acceptance Standards, Visual Examination.pdf

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards Guides and Remendations issued by the World Trade Organization Technical Barriers to Trade (TBT)Committee. Designation:A802-19 INTERNATIONAL Standard Practice for Steel Castings Surface Acceptance Standards Visual Examination This standard is issued under the fixed designation A802;the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon (e)indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the U.S.Department of Defense. 1.Scope* 2.Terminology 1.1 This practice covers the acceptance criteria for the 2.1 Definitions of Terms Specific to This Standard: surface inspection of steel castings by visual examination.Four levels of acceptance standards are provided. Expansion Discontinuities 2.1.1 rat tails n-long narrow linear depressions or small 1.2 Acceptance levels utilize Steel Castings Research and steps occurring on a casting surface.Rat tails form as a result Trade Association (SCRATA)2 graded reference parators of sand expansion and minor buckling of the mold surface for the visual determination of surface texture surface during filling of the mold with liquid metal. roughness and surface discontinuities described as follows: Acceptance levels 2.1.2 scab n-a raised rough area on a casting that usually A-Surface Texture consists of a crust of metal covering a layer of sand. B-Nonmetallic Inclusions Sometimes a scab consists of a raised rough area of essen- C-Gas Porosity tially solid metal on the surface of a casting. D-Solidification Discontinuities 2.1.3 veins n-raised narrow linear ridges that form upon E-Sand Expans...