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Grade Introduction:
SCM420 are alloy steel with high hardenability, temper brittleness, well weldability, less cold cracking tendency, good machinability, and great cold plastic strain. SCM420 generally are 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.
Grade Application:
SCM420 case hardening alloy steels are widely used as gear components of all kind and cog wheels. Open die steel forgings for general engineering purposes. Steel is available to supply different size of SCM420 steel and is able to supply modified SCM420 steel composition according to different requirements.
Equivalent grades:
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, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, 2714, SKD-11, P20, P20+s, P20+Ni, ASTM Sa-36, ASTM SA-105, SAE 1018, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.
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Chemical composition:
The following table shows the chemical composition of SCM 420 steel:
Content (%)
0 ≦ 0.03
0 ≦ 0.03
0 ≦ 0.025
0 ≦ 0.03
Mechanical Properties:
Tensile strength (kgf/mm²): ≧95
Elongation (%): ≧14
Cross section reduction rate (%): ≧40
Impact value (J/cm2): ≧6
Hardness (Hb) : 352~362
Heat treatment:
850~900℃ 1st Oil Cooling, 800~850℃ 2rd Oil Cooling.
150~200℃ Air Cooling.
Physical Properties:
  • Modulus of elasticity [103 x N/mm2]: 210
  • Density [g/cm3]: 7.85
  • Thermal conductivity [W/m.K]: 20.0
Thermal Properties:
Thermal conductivity [W/m.K]: 20.0
Forging Properties:
Hot forming temperature: 1100-850℃
Stress Reliving:
850~900℃ Air Cooling
850℃ Furnace Cooling
Density [g/cm3]: 7.85
Machine ability:
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.
Supply Cities:
Ahmedabad, Amaravathi, Ambattur, Bangalore, Belgaum, Chennai, Chittoor, Coimbatore, Dindigul, Mysore, Nellore, Hyderabad, Kochi, Mangalore, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Tamil Nadu, Telangana, Salem, Thanjavur, Tirchy, Erode, Vellore, Ranipet, Sivakasi, Karur, Hosur, Nagercoil, Kanchepuram, Karaikudi, Neyveli, Cuddalore, Kumbakonam, Thiruvannamalai, Pollachi, Rajapalayam, Gudiyatham, Pudukottai, Vaniyambadi, Ambur, Nagapattinam, Trivandrum, Vijayawada, Guntur, Thirupathi, Nazarathpet, Kakinada, Kurnool, Kadapa, Nizamabad, Mahabubnagar, Karimnagar.