Standard

SAE J431

Revised

Note: This standard has a new edition: SAE J431

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Abstract

This SAE Standard covers the hardness, tensile strength, and micro structural requirements for gray iron Sand mold castings used in automotive and allied industries. the chemical requirements for alloy gray iron automotive camshafts are included in the document under castings for special application with controlled composition and microstructure. Appendix a provides general information on application of gray iron in automotive castings and chemical composition to meet hardness, micro structural, and other properties needed for particular service conditions. Casting tensile strength estimates are provided in Appendix a for design reference. NOTE - this document was rewritten in June 1970 to establish casting hardness as the control parameter for casting strength, implicit using a single tensile/hardness relationship, developed in a research study, for all grades. new grade designations were assigned at that time. In March 1993 a new grade 1800h was assigned and explicit tensile strength to hardness (t/h) ratio requirements for each grade wire incorporated and given statistical limits to increase effectiveness of specification control over strength, mach inability, castability, and other properties in castings. The 30 mm sand cast test bar, previously standard in SAE J431 for just tensile strength and eliminated in 1970, was reestablished for t/h control to maximize degree of standardization of the method and interchangeability of irons from foundry to foundry. Data of the 1970 study in combination with other published and unpublished data were analyzed to determine individual t/h limits for each grade. Casting tensile strength estimates given in Appendix A for design reference were revised in March 1993 to provide uniform statistical definition and alignment wit casting hardness for all grades.

Document information

  • Standard from SAE_AC
  • Published:
  • Version: 0
  • Document type: IS