Softening method for CSS-42l gear steel forging stock
A gear steel and forging billet technology, which is applied in the softening field of CSS-42L gear steel forging billet, can solve problems such as difficult machining and difficult machining
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[0015] The forging billet of a hollow gear shaft used in an aviation transmission system is made of CSS-42L gear steel. The forging of this material has a hardness of up to HRC45.1 after sub-temperature annealing at 680°C. In order to ensure its machining requirements, the forging billet was softened. Proceed as follows:
[0016] 1. Carry out high-temperature austenitization of the CSS-42L billet at a temperature of 1110°C. After holding for 1 hour, carry out oil quenching, and the temperature of the quenching oil bath is 55°C;
[0017] 2. After oil quenching, carry out stress relief treatment at 150°C, and the stress relief time is 2 hours;
[0018] 3. After the stress is eliminated, mechanical cutting is performed.
[0019] Through the above method, the hardness of the CSS-42L forging billet is reduced from the previous HRC45.1 to HRC30.3, and the metal cutting performance of the material can be greatly improved.
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