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Differences Between SCM440H Steel and 4140 Steel
Are you using 4140 steel and considering a switch to SCM440H? Or are you unsure which to choose for your project? Both SCM440H and 4140 are high-performance alloy steels with unique advantages. Let’s explore their key differences and help you make the best choice!
1. What Are SCM440H and 4140 Steels?
a. SCM440H Steel
- Standard: JIS (Japanese Industrial Standard).
- Composition: Chromium-Molybdenum alloy with added carbon for enhanced hardness and wear resistance without brittleness.
- Applications: Machine shafts, gears, slides, and similar components requiring wear resistance and toughness.
b. 4140 Steel
- Standard: AISI (American Iron and Steel Institute).
- Composition: Chromium-Molybdenum alloy with slightly higher carbon content.
- Applications: Widely used in hydraulic shafts, toolbars, torsion bars, and motor shafts.
2. Chemical Composition Comparison
The chemical composition of SCM440H and 4140 is broadly similar, but there are distinct differences:
|
Element |
4140 |
|
|---|---|---|
|
Chromium |
Up to 1.2% |
Up to 1.1% |
|
Carbon |
~0.4% |
~0.42% |
|
Manganese |
0.85% |
1.0% |
Key Observations:
- Chromium (Cr): Higher in SCM440H, providing a brighter finish and better wear resistance.
- Carbon (C): Higher in 4140, resulting in slightly greater initial hardness.
- Manganese (Mn): Higher in 4140, making it more brittle but improving initial machinability.
3. Mechanical Properties Comparison
a. SCM440H Steel
- Excellent wear resistance, ideal for long-term durability.
- High toughness, reducing deformation under stress.
- Uniform hardness across all dimensions.
- Tensile strength: ~10.0 N/mm².
b. 4140 Steel
- High wear resistance due to increased carbon content.
- Slightly higher initial hardness but less ductile than SCM440H.
- Tensile strength: ~10.0 N/mm².
Which Should You Choose?
While both SCM440H and 4140 are comparable, the choice depends on your specific application needs:
- SCM440H: Best for components requiring toughness, flexibility, and long-term wear resistance (e.g., machine shafts, gears).
- 4140: Suited for applications prioritizing initial hardness over ductility (e.g., hydraulic shafts, toolbars).
Need Help Deciding?
Sevit Special Steel supplies high-quality SCM440H tailored to your needs. Contact us today to learn more!
* Tel: +84 332 91 61 61
* Email: sales@sevit.vn
* Zalo: Sevit Special Steel
Topic Steel SCM4440H
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