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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/

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