DIN 1.7225 (4140, SCM440, 42CrMo) Alloy Steel
DIN 1.7225 is a high-strength, low-alloy steel belonging to the chromium-molybdenum (Cr-Mo) family. It is known for its excellent hardenability, toughness, and wear resistance after heat treatment. This steel is widely used in applications requiring high strength and fatigue resistance, such as automotive components, machinery parts, and aerospace structures. Below is a detailed overview:

 

 

Heat Treatment

Normalizing: 850–880°C, air cooling to refine grain structure.

Quenching: 840–860°C in oil, followed by tempering at 550–680°C to achieve desired hardness-toughness balance.

Surface Hardening: Can be carburized or induction-hardened for enhanced wear resistance on surfaces.

 

 

 

 

Key Characteristics

High Strength: Suitable for heavy-load applications (e.g., gears, shafts, bolts).

Good Hardenability: Uniform hardness throughout thick sections after heat treatment.

Wear Resistance: Ideal for components subject to friction (e.g., bearings, dies).

Weldability: Requires preheating (150–200°C) and post-weld heat treatment to avoid cracking.

 

 

Applications

Automotive: Crankshafts, connecting rods, gears, axle shafts.

Aerospace: Landing gear components, engine parts.

Machinery: High-strength bolts, nuts, hydraulic cylinders.

Oil & Gas: Drill collars, wellhead components.

Tooling: Die blocks, forging dies, punches.

 

 

 

 

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