Research on spheroidization annealing process of GCr15 steel wire in bell furnace
To analyze microstructure and hardness of GCr15 bearing steel after spheroidization annealing using both conven-tional and improved processes.Results show that GCr15 bearing steel hardness value after improved process spheroidization annealing treatment is lower 6 HBW than that of conventional process spheroidization annealing treatment,and fluctuation of microstructure level is small.After drawing and reducing by 0.2～0.3 mm,finished material hardness meets requirements.Improved spheroidization annealing process using hydrogen gas as protective atmosphere,material has no additional decar-burization.Adopting rapid heating method,the process cycle is shortened 2 h,and material microstructure and hardness uniformity have obvious advantages compared to before improvement.Improved production efficiency and significant eco-nomic benefits.
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