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SCM420 are alloy steel with high hardenability, temper brittleness, well weldability, less cold cracking tendency, good machinability, and great cold plastic strain. SCM420 generally is used for the parts which need high wear resistance, such as gears, shafts, high-pressure pipes, all kinds of fasteners, and so on. Carburizing structural steel.
SCM420 case hardening alloy steels are widely used as gear components of all kinds and cogwheels. Open die steel forgings for general engineering purposes. Steel is available to supply different sizes of SCM420 steel and is able to supply modified SCM420 steel composition according to different requirements.
GB 20CrMo, JIS SCM420, ASTM 4118, DIN 25CrMo4.
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
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The following table shows the chemical composition of SCM 420 steel:
|Content (%)||0.18-0.23||0.60-0.85||0.15-0.35||0 ≦ 0.03||0 ≦ 0.03||0.90-1.20||0.15-0.30||0 ≦ 0.025||0 ≦ 0.03|
Tensile strength σb (MPa): ≥ 885 (90)
Yield strength σs (MPa): ≥ 685 (70)
Elongation rate δ5 (%): ≥12
Section shrinkage ψ (%): ≥50
Impact energy Akv (J): ≥78
Impact toughness value αkv (J / cm²): ≥98 (10)
Hardness: ≤ 197HB
After the final heat treatment, there is a suitable drawing pass.
850~900℃ 1st Oil Cooling, 800~850℃ 2nd Oil Cooling.
150~200℃ Air Cooling.
Thermal conductivity [W/m.K]: 20.0
Hot forming temperature: 1100-850℃
After the final cold drawing, there is a stress relief heat treatment in a controlled atmosphere.
850~900℃ Air Cooling
850℃ Furnace Cooling
Density [g/cm3]: 7.85
Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel)
The weldability of AISI 4118 steel is also very good, with excellent machining or cutting properties.
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