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Nickel-based Alloy Steel
Home / Products / Steel / Nickel-based Alloy Steel / 4340/EN24/817M40/40CrNi2Mo alloy steel
4340/EN24/817M40/40CrNi2Mo alloy steel

4340/EN24/817M40/40CrNi2Mo alloy steel

4340 (EN24 / 817M40 / 40CrNi2Mo) is a high-strength, low-alloy steel containing nickel, chromium, and molybdenum. It is known for its excellent toughness, fatigue resistance, and high tensile strength in both normalized and heat-treated conditions. This steel is widely used in aerospace, automotive, and heavy machinery applications where critical performance under high stress is required.

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  • Benefits
  • Heat Treatment
  • Applications
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  • Parameter
Benefits

Benefits:
High Strength and Toughness: Excellent mechanical properties after heat treatment, suitable for dynamic or impact-loaded parts.
Good Fatigue Resistance: Performs reliably under repeated loading, ideal for shafts and gears.
Excellent Hardenability: Deep hardening capability allows uniform hardness through thick sections.
Good Machinability and Weldability: Easily machinable in normalized or annealed condition; weldable with proper procedures.
Resistant to Wear and Shock: Durable under heavy mechanical loads and harsh environments.

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