GB/T 5216-2004 20CrMnTiH Steel

20CrMnTiH gear steel is used to manufacture important parts such as gears, ring gears, gear shafts and crossheads that are subjected to high-speed heavy loads, impact and friction with a section of less than 30 mm.

20CrMnTiH Features

20CrMnTiH Steel is a well-performing carburized steel with high hardenability. It has a hard and wear-resistant surface and a tough core after carburizing and quenching. It has high low temperature impact toughness, medium weld ability and machinability after normalizing.

Chemical Composition of GB/T 5216-2004 20CrMnTiH

C: 0.17~0.23
Si: 0.17~0.37
Mn: 0.80~1.15
S:≤0.035
P: Allowable residual content≤0.035
Cr: 1.00~1.35
Ni: Allowable residual content≤0.030
Cu: Allowable residual content≤0.030
Ti: 0.04~0.10

20CrMnTiH Steel Mechanical Property

Tensile strength σb (MPa): ≥1080(110)
Yield strength σs (MPa): ≥835(85)
Elongation δ5 (%): ≥10
Area shrinkage ψ (%): ≥45
Impact work Akv (J): ≥55
Impact toughness value αkv (J/cm2): ≥69(7)
Hardness: ≤217HB

Heat treatment specification of 20CrMnTiH
Quenching: first 880 ° C, second 870 ° C, oil-cooled; tempered 200 ° C, water-cooled, air-cooled

Density and modulus of elasticity
Density: 7.8 × 103kg/m3
Modulus of elasticity: 207GPa
Poisson's ratio: 0.29
Thermal conductivity: 1.26 × 10-51/°C