The standard number corresponding to the properties and applications of A504/A504M-14 steel grade is ASTM A504/A504M-14. ASTN A504/A504M-14 is the standard specification for wrought carbon steel wheels for locomotives and cars. It covers the requirements for chemical composition, mechanical properties, and manufacturing processes for these steel wheels. The steel grade A504/A504M-14 is specifically designed for use in the manufacturing of locomotive and car wheels due to its excellent strength and durability properties. By meeting the requirements outlined in ASTM A504/A504M-14, this steel grade ensures the wheels can withstand the rigorous demands of the railway industry and provide reliable performance.