ASTM F912-11(2017),Standard Specification for Alloy Steel Socket Set Screws.
ASTM F912-11(2017) covers the requirements for quenched and tempered alloy steel socket-set screws (SSS) in nominal diameters 0.060 through 2 in. having hardnesses 45 to 53 HRC.
5. Chemical Composition
5.1 The chemical composition of the screw material shall conform to the heat analysis specified in Table 1.
5.2 One or more of the following alloying elements:chromium, nickel, molybdenum, or vanadium shall be present in the steel in sufficient quantity to assure the specific strength properties are met after oil quenching and tempering. The steel shall meet the aisi definition of alloy steel, that is, maximum and minimum element content requirement or minimum element limits specified.
5.3 Alloy steel to which bismuth, selenium, tellurium, or lead has been intentionally added to improve machinability shall be permitted.
5.4 Material analysis may be made by the purchaser from finished products and the chemical composition shall conform to the requirements specified for the product analysis in Table 1.