SCM415 Alloy Steel Properties

SCM415 Alloy Steel is a widely used chromium-molybdenum alloy steel specified under Japanese Industrial Standards (JIS G4053). It’s engineered for mechanical structural components that demand a good combination of strength and toughness.

At Aobo Steel, we have extensive experience in supplying and processing Cr-Mo alloys, such as SCM415. While similar grades exist under other international standards, precise cross-referencing is needed to ensure exact equivalence for your specific requirements.

1. Chemical Composition

• Carbon (C): 0.13% – 0.18%:
• Silicon (Si): 0.15% – 0.35%
• Manganese (Mn): 0.60% – 0.90%
• Phosphorus (P): Max 0.030%
• Sulfur (S): Max 0.030%
• Chromium (Cr): 0.90% – 1.20%
• Molybdenum (Mo): 0.15% – 0.25%
• Copper (Cu): Max 0.30%

2. SCM415 Alloy Steel Heat Treatment

To achieve its intended properties, SCM415 steel typically undergoes a case-hardening process involving:

1. Carburizing: Heating the steel (around 850-900°C / 1562-1652°F) in a carbon-rich atmosphere. This increases the carbon content of the surface layer to a controlled depth.
2. Hardening: Quenching the steel (usually in oil) from an appropriate austenitizing temperature (often 780-830°C / 1436-1526°F for the second quench after reheating). This transforms the high-carbon surface into hard martensite. Double quenching techniques are sometimes used for optimized grain refinement in both the case and core.
3. Tempering: Reheating the quenched part to a lower temperature (typically 150-200°C / 302-392°F) and holding it for a specified time. This process reduces the brittleness of the martensite, relieves internal stresses, and improves overall toughness.

The result of this treatment is a component with excellent wear resistance on the surface and a tough core that can withstand impact loads.

3. SCM415 Alloy Steel Applications

Given its ability to be case-hardened for superior wear resistance combined with good core strength and toughness, SCM415 steel is frequently used for manufacturing demanding parts such as:

• Gears
• Shafts (e.g., camshafts, crankshafts)
• Bearings and bearing races
• Pins and Piston Pins
• Other machine components are subjected to high stress and surface wear.

Aobo Steel has over 20 years of experience in producing tool and alloy steels, such as SCM415 steel. We can supply this material and provide technical support based on your specific application needs. Contact us to discuss your requirements.