The corresponding standard number for understanding the properties and applications of A291/A291M-17 steel grade refers to the specific designation given to this steel grade by the governing body or organization responsible for setting industry standards. In this case, A291/A291M-17 refers to the ASTM International standard for “Steel Forgings, Carbon and Alloy, for Pinions, Gears, and Shafts for Reduction Gears.” This standard provides specific requirements for the chemical composition, mechanical properties, and heat treatment of steel forgings used in the manufacture of pinions, gears, and shafts for reduction gears. By following this standard, manufacturers can ensure that their products meet the necessary quality and performance requirements for their intended applications.