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

Active Publication Date: 2017-05-31
HARBIN DONGAN ENGINE GRP
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Problems solved by technology

However, the hardness of forgings of this material after sub-temperature annealing at 680 °C is as hi...

Method used

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Embodiment

[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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Abstract

The invention relates to a softening method for a CSS-42l gear steel forging stock. According to the softening method, a material is entirely in an under-cooled austenite state by treatments of high-temperature austenization, oil quenching and stress elimination; the under-cooled austenite belongs to a soft structure which is relatively low in hardness, so the hardness of CSS-42L gear steel can be greatly reduced to HRC 28-35, and the requirements of machining are satisfied.

Description

technical field [0001] The invention relates to a softening method, in particular to a softening method for a CSS-42L gear steel forging billet. Background technique [0002] With the gradual increase in the load capacity of aircraft, people put forward extremely high requirements for the comprehensive mechanical properties and temperature resistance of aviation parts. The United States took the lead in developing the CSS-42L third-generation gear steel. A notable feature of this steel is that it has good high-temperature red hardness and excellent high-temperature tempering resistance, and can serve for a long time below 427 ° C. However, many of its metallurgical properties are domestic Not mastered yet. [0003] Traditional gear steel forging blanks are usually quenched and tempered before machining to obtain appropriate cutting hardness. CSS-42L third-generation gear steel belongs to low-carbon high-alloy martensitic precipitation-hardening stainless steel with good ha...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/773C21D9/32
CPCC21D1/18C21D1/773C21D9/32C21D2261/00
Inventor 孙振淋辛玉武周动林刘慧郝博健辛昕金玉亮曾西军徐奉鑫崔学威
Owner HARBIN DONGAN ENGINE GRP
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