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Weldability
X153CrMoV12 (1.2379) has moderate weldability. Its high carbon content can lead to cracking during welding. To prevent cracks, the steel should be preheated to between 200°C and 400°C. After welding, stress-relief annealing at about 550°C to 650°C is recommended to reduce residual stresses in the material.
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Machinability
In the soft-annealed condition the steel offers good machinability, while machining in the hardened condition is more demanding. To reduce friction during machining and extend tool life, use cutting fluids. Tool wear is well controllable in the annealed state but significantly higher when hardened.
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Magnetizability
The steel X153CrMoV12 exhibits strongly magnetic properties.
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Forgeability
Forgeability is limited. Because of the high hardenability, cracks can form easily. Recommended forging temperature is between 900°C and 1100°C. To avoid cracking, complete the forging process before the steel cools below 850°C.
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Corrosion resistance
X153CrMoV12 is susceptible to corrosion in very humid environments. To improve corrosion resistance, additional surface treatments such as nitriding or chrome plating are recommended. Without such treatments, consider other (stainless) steel alloys with better inherent corrosion resistance for humid conditions.
