Standard: ASTM A29 / A29M-04 4140 What is the material: 4140 alloy structural steel, this steel has good workability, machining deformation small, anti-fatigue performance is quite good, is the so hardenability steel, a more heat-treated after 4140 good strength and excellent mechanical properties, good technology, finished high maximum use temperature of 427 degrees Celsius 4140 chemical composition: Chemical composition, 4140 carbon (C) 0.38 ~ 0.43, manganese (Mn) 0.75 ~ 1.00, P (P) ≤0.030, sulfur (S) ≤0.040, nickel (Ni) ≤0.030, chromium (Cr) 0.80 ~ 1.10 ● Features and Scope: strength, hardenability, good toughness, quenching small deformation at high temperatures has a high creep strength and rupture strength. Requirements for the manufacture of higher intensity than the 35CrMo steel and tempered forgings larger cross-section, such as the big locomotive traction gears, supercharger drive gear, rear axle, greatly affected by the load rod and spring, can also be used 2000m or less deep oil drill pipe joints and salvage tools. 4140 alloy structural steel strength, hardenability, good toughness, when small deformation hardening, high strength and creep rupture strength at high temperatures. 4140 alloy steel structure with mechanical properties, tensile strength σb (MPa): ≥1080 (110), yield strength σs (MPa): ≥930 (95), elongation δ5 (%): ≥12 quenched and tempered steel is mechanically one of the important material widely used in industry and manufacturing. 2008 on behalf of my company for the first time to roll forging production for export 254 mm ~ 310 mm large size 4140 steel hot-rolled tempered material. Production using annealing furnace and sink were quenched and tempered steel, for process and process parameters we also conducted a series of experimental study. 14140 steel, technical requirements of the user 4140 Steel