This SAE Standard covers the hardness, tensile strength, and microstructure and special requirements of gray iron sand molded castings used in the automotive and allied industries. Specific requirements are provided for hardness of castings. Test bar tensile strength/Brinell hardness (t/h) ratio requirements are provided to establish a consistent tensile strength-hardness relationship for each grade to facilitate prediction and control of tensile strength in castings. Provision is made for specification of special additional requirements of gray iron automotive castings where needed for particular applications and service conditions.
NOTE—This document was revised in 1993 to provide grade specific t/h control. In 1999 the document was revised to make SI metric units primary. To better align the grading system with long established production methods and grades produced, the previous system of grading by fixed combinations of tensile strength and hardness was changed in 1999 to a system of grading by variable combinations of test bar t/h ratio and casting hardness grades. The number of hardness grades was increased relative to the number of previously available ranges to facilitate centering of casting mean hardness in the specification range so that dependence of cost optimization on controlling near the low or high sides of specification ranges is minimized.
The Metals Technical Committee (MTC) controls specifications for Ferrous and Non-Ferrous: Metallic Wrought Products, Cast & Sintered Products, Metal Properties & Processes, and Metal Test Procedures. The MTC oversees standards to establish uniform procedures that: 1) establish a common language for the industry to review materials and processes through standards, 2) are reviewed and updated on a regular 5-year basis with coordination to other industry specifications, and 3) creates a common industry interface for technical discussions. The MTC ensures that all standards are developed with qualified personnel to perform respective tasks, meets at least once a year to provide relevant updates to current specifications, and assesses whether new standards are needed by industry. The committee also maintains the public web pages by reviewing and updating the information necessary. The MTC shall report to the Materials Processes and Parts Council (MPPC) on a biannual basis. Participants in the SAE Metals Technical Committee include representatives from OEMs, suppliers, consulting firms, government, and other interested parties.
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Automotive Gray Iron Castings
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