42CrMoA GB/T Alloy Steel Bar 3077-1999
Classification by use: 1) Steel for construction and engineering: a. ordinary carbon structural steel; b. low alloy structural steel; c. reinforced steel. 2) Structural steel: a. Steel for machinery manufacturing: a) quenched and tempered structural steel; b) Case hardened structural steel: including carburized steel, ammonia steel and surface hardening steel; c) easy-to-cut structural steel; d) Cold plastic forming steel: including cold stamping steel and cold head steel. b. spring steel c. bearing steel 3) tool steel: a. carbon tool steel; b. alloy tool steel; c. high speed tool steel. 4) special performance steel: a. acid resistant stainless steel; b. heat-resistant steel, including anti-rust steel, heat-resistant steel, gas valve steel; c. Electrical alloy steel; d. wear-resistant steel; and. low temperature steel; F. electrical steel 5) Professional steel, such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery steel, etc.
