SCM440 Alloy Steel

 

 

SCM440  Chemical Composition(JIS G4051)

 

C(%)	Si(%)	Mn(%)	P(%)	S(%)	Cr(%)	Mo(%)	Ni(%)	Cu(%)
0.38-0.43	0.15-0.35	0.6-0.85	0≦0.03	0≦0.03	0.9-1.2	0.15-0.3	0≦0.25	0≦0.3

 

onditions of heat treatment

Annealing: 830℃ Furnace Cooling

Normalization: 830~880℃ Air Cooling

Hardening: 830~880℃ Oil Cooling

Tempering: 530~630℃ Rapid Cooling

Criterion for heat treating conditions revise:

Ac: 750~790℃

Ar: 740~690℃

Ms: 310℃

 

Mechanical properties

Tensile strength (kgf/mm²): ≧100

Yield strength (kgf/mm²): ≧85

Elongation (%): ≧12

Cross section reduction rate (%): ≧45

Impact value (J/cm2): ≧6

Hardness (Hb) : 285~352

 

• Applications:

• Automotive Industry: Widely used in manufacturing various automotive parts such as engine components (e.g., crankshafts, camshafts), transmission gears, drive shafts, and suspension systems. Its high strength and toughness can meet the demanding performance requirements of automotive applications.

• Aerospace Field: Utilized in some aerospace components where high strength and reliability are crucial, such as certain structural parts and mechanical components.

• Machinery Manufacturing: Applied to produce machine tools, gears, bearings, and shafts for general machinery due to its excellent mechanical properties and wear resistance.

• Oil and Gas Industry: Used in the production of equipment and components for the oil and gas exploration and production sector, which requires materials that can withstand high pressures and corrosive environments.

• Advantages:

• Good Processability: It has good forgeability, machinability (can be easily cut, drilled, and milled), and weldability, making it convenient for manufacturing and processing into various shapes and sizes of parts.

• High Strength-to-Weight Ratio: Offers a relatively high strength compared to its weight, which is beneficial for applications where weight reduction is important without sacrificing structural integrity.

 

• Resistance to Wear and Fatigue: The alloy composition and proper heat treatment endow it with good wear resistance and fatigue resistance, ensuring a longer service life in demanding working conditions.

• Considerations:

• Heat Treatment Control: Precise control of the heat treatment process is essential to achieve the desired mechanical properties. Improper heat treatment may lead to issues such as insufficient hardness, reduced toughness, or internal stresses.

• Corrosion Resistance: Although it has some corrosion resistance, in highly corrosive environments, additional surface protection measures (such as coating or plating) may be required to prevent corrosion.

• Cost: Compared to some common carbon steels, the cost of SCM440 alloy steel may be relatively higher. However, considering its superior performance and longer service life in specific applications, the overall cost-effectiveness may still be favorable in many cases.

Hot Tags: scm440 alloy steel, China scm440 alloy steel suppliers, factory, CR1 Steel, 1 4016, Wear resistant Steel, 1J22, CuZn31Si1, HX340BD