Helengriffin21
New Member
China
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Inviato il 20/01/2020 : 02:37:18
Alloy structual steel Grade:4140 1.Introduction 4140 belongs to ultra-high strength steel, has high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit and multi-impact resistance after quenching and tempering treatment, such as large gears for locomotive traction, supercharger transmission gears, pressure vessel gears, rear axles, extremely loaded connecting rods and spring clips, It can also be used for oil deep well drill pipe joints and fishing tools below 2000m, and can be used for molds of bending machines. 2. Available sizes and surface state AISI 4140 Shape Sizes Surface state Delivery state Bar Diameter:10mm-1000mmBlack surface bright surface Grinded Peeled Turnedcold drawn hot rolled cold rolled Annealed quenching and tempering Length:2000mm-5000mm Plate Thick:50mm-120mm Width:2000mm-2300mm Length:3000mm-5800mm 3.Chemical composition CHEMICAL COMPOSITIONS(%) CSiMnPSCrMoVNiOther 0.38-0.450.17-0.370.50-0.80≤0.035≤0.0350.90-1.200.15-0.25--- 4.Equivalent standards GBAISIDINJIS 42CrMo41401.7225SCM440 5.Mechanical properties Tensile strength σb (MPa): ≥ 1080 (110) Yield strength σs (MPa): ≥ 930 (95) Elongation δ5 (%): ≥12 Area shrinkage ψ (%): ≥ 45 Impact work Akv (J): ≥ 63 Impact toughness value αkv (J/cm2): ≥78(8) Hardness: ≤217HB 6.Heat treatment Annealed annealing No.1 "760±10 °C annealing, furnace cooling to 400 ° C air cooling. HB220-230 Normalizing No.4 860±10°C normalizing, normal air cooling. Quenching and quenching+tempering No.5 840±10°C quenching or oil (depending on the complexity of the product), tempering at 680-700 degrees. HB<217 Tempering quenching+tempering No.6 840±10°C quenching oil, then tempering at 470 degrees. HRC41-45 Quenching and quenching+tempering No.7 840±10°C quenching oil, then tempering at 480 degrees. HRC35-45 Tempering quenching+tempering No.8 850 °C hardened, and then tempered 510 degrees. HRC38-42 Quenched and tempered + Tempering No.9 850 ° C hardened, and then tempered 500 degrees. HRC40-43 Quenched and tempered + Tempering No.10 850 ° C hardened, and then tempered at 510 ° C. HRC36-42 Quenched and tempered + Tempering No.11 850 ° C hardened, and then tempered at 560 ° C. HRC32-36 Tempered quenching+tempering No.12 860 °C hardened, and then tempered 390 degrees. HRC48-52. 4140 has high strength, high hardenability, good toughness, small deformation during quenching, high creep strength and long-lasting strength at high temperatures. Forgings requiring higher strength and greater quenching and tempering sections than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, pressure vessel gears, rear axles, extremely loaded connecting rods and spring clips It can also be used for oil deep well drill pipe joints and fishing tools below 2000m, and can be used for molds of bending machines.4140,1.7225,SCM440 Steel round bar suppliers website:http://www.steelm2.com/alloy-steel/4140-1-7225-scm440-steel/ |