42CrMo4 is one of the most widely used alloy structural steels in global machinery and engineering industries. Its combination of high strength, toughness, and stable hardenability makes it a preferred choice for heavy-duty components that operate under impact, pressure and long-term mechanical stress.
ChinaSpecSteel supplies 42CrMo4 / 42CrMo / AISI 4140 / SCM440 series materials with stable chemical composition and reliable mechanical properties, designed for buyers who require consistent quality and long service life in industrial production.
Material Overview
42CrMo4 belongs to the family of chromium-molybdenum alloy steels. The addition of chromium improves wear resistance and hardenability, while molybdenum enhances tensile strength and heat-treat performance.
This grade is often used in high-load systems where precision, durability, and resistance to fatigue are essential.
Common Applications
Transmission shafts
Gear components
Heavy-duty bolts and nuts
Forged parts
Hydraulic system parts
Mining and construction machinery components
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.38 – 0.45 |
| Silicon (Si) | 0.10 – 0.40 |
| Manganese (Mn) | 0.60 – 0.90 |
| Chromium (Cr) | 0.90 – 1.20 |
| Molybdenum (Mo) | 0.15 – 0.30 |
| Sulfur & Phosphorus | ≤ 0.025 |
If your project requires dependable 42CrMo4 alloy steel with stable supply and technical support, you can contact our team for specifications, drawings, and pricing.
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