SCM420 Alloy Steel, SCM420 Steel, SCM420 Round Bar, SCM420 Steel Bar, Carburizing Structural Steel, ASTM A29 4118 Steel, AISI 4118 Steel, JIS SCM420, DIN 18CrMo4 Steel, SCM420 Flat Bar, SCM420 Square Bar, SCM420 Alloy Steel Round Bar, SCM420 Alloy Steel Square Bar, SCM420 Alloy Steel Flat Bar
What is SCM420 Alloy Steel?
SCM420 belongs to the category of alloy steel known for its elevated hardenability, resistance to temper brittleness, excellent weldability, reduced susceptibility to cold cracking, favorable machinability, and exceptional cold plastic strain characteristics. This alloy steel is commonly employed in applications requiring heightened wear resistance, including gears, shafts, high-pressure pipes, various fasteners, and similar components. Additionally, SCM420 is recognized as carburizing structural steel.
SCM420 steel stands out as a popular alloy steel used in engineering applications, and Lakshya International is a leading and reliable supplier of SCM420 steel materials.
Belonging to the JIS standard, SCM420 steel is widely utilized in engineering purposes, including the manufacturing of fasteners, high-pressure pipes, and more advanced carburized components such as gears and shafts. These components operate in noncorrosive mediums with temperatures below 250 ℃, often in conjunction with a nitrogen-hydrogen mixture.
One notable characteristic of SCM420 steel is its high quench-hardening ability, devoid of temper brittleness. Furthermore, the steel exhibits excellent weldability, making it suitable for various applications. Its machining and cutting properties are commendable, with minimal susceptibility to cold crack formation. Additionally, SCM420 steel maintains good machinability and cold straining plasticity.
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SCM420 Grade Application:
SCM420 alloy steels with case-hardening properties find extensive applications in various gear components and cogwheels. These open-die steel forgings cater to general engineering needs. Our steel offerings encompass a diverse range of SCM420 sizes, and we have the capability to provide customized SCM420 steel compositions tailored to specific requirements.
SCM420 Chemical composition:
The following table shows the chemical composition of SCM 420 steel:
Element |
C |
Mn |
P |
S |
Cr |
Mo |
Ni |
Cu |
Si |
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 |
SCM420 Mechanical Properties:
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
SCM420 Equivalent grades:
GB 20CrMo, JIS SCM420, ASTM 4118, DIN 25CrMo4.
SCM420 Hardness:
352-362
SCM420 Heat treatment:
After the final heat treatment, there is a suitable drawing pass.
SCM420 Hardening:
850~900℃ 1st Oil Cooling, 800~850℃ 2nd Oil Cooling.
SCM420 Tempering:
150~200℃ Air Cooling.
SCM420 Physical Properties:
- Modulus of elasticity [103 x N/mm2]: 210
- Density [g/cm3]: 7.85
- Thermal conductivity [W/m.K]: 20.0
SCM420 Thermal Properties:
Thermal conductivity [W/m.K]: 20.0
SCM420 Forging Properties:
Hot forming temperature: 1100-850℃
SCM420 Stress Relieving:
After the final cold drawing, there is a stress relief heat treatment in a controlled atmosphere.
SCM420 Normalizing:
850~900℃ Air Cooling
SCM420 Annealing:
850℃ Furnace Cooling
SCM420 Density:
Density [g/cm3]: 7.85
SCM420 Machine ability:
Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel)
SCM420 Welding:
The weldability of AISI 4118 steel is also very good, with excellent machining or cutting properties.
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