A method for shortening the spheroidizing annealing time of gcr15 bearing steel by controlled rolling and controlled cooling process
A technology of controlled rolling, controlled cooling, and annealing time, applied in heat treatment process control, manufacturing tools, heat treatment equipment, etc., can solve the problems of long austenitization time and extremely uneven cementite particle size
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Embodiment 1
[0029] A method for shortening the spheroidizing annealing time of GCr15 bearing steel by controlled rolling and controlled cooling process, comprising the following process steps:
[0030] 1. Heat the GCr15 bearing steel sample to 1150°C and treat it isothermally for 30 minutes.
[0031] 2. The initial thickness of the sample is 30mm. After isothermal treatment, a single-pass rolling is carried out at 950°C with a reduction of 9mm and a thickness of 21mm after rolling. The purpose is to reduce the austenite grains.
[0032]3. After the first pass of rolling, air-cool until the temperature drops to 900°C, then carry out the second pass of rolling, the reduction is 4mm, and the thickness after rolling is 17mm. The purpose is to refine the austenite grains, and at the same time, the deformation leads to the fracture of a small amount of proeutectoid cementite formed at the grain boundary, so as not to form reticular cementite.
[0033] 4. After the second pass of rolling, cool ...
Embodiment 2
[0040] A method for shortening the spheroidizing annealing time of GCr15 bearing steel by controlled rolling and controlled cooling process, comprising the following process steps:
[0041] 1. Heat the GCr15 bearing steel sample to 1150°C and treat it isothermally for 30 minutes.
[0042] 2. The initial thickness of the sample is 30mm. After isothermal treatment, a single-pass rolling is carried out at 950°C with a reduction of 9mm and a thickness of 21mm after rolling. The purpose is to reduce the austenite grains.
[0043] 3. After the first pass of rolling, air-cool until the temperature drops to 900°C, then carry out the second pass of rolling, the reduction is 4mm, and the thickness after rolling is 17mm. The purpose is to refine the austenite grains, and at the same time, the deformation leads to the fracture of a small amount of proeutectoid cementite formed at the grain boundary, so as not to form reticular cementite.
[0044] 4. After the second pass of rolling, air-...
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