45 steel hot-rolled round steel bar special for numerical control machine tool spindle and preparation method of 45 steel hot-rolled round steel bar

The invention belongs to the technical field of pressure processing of black metal materials, and particularly relates to a 45 steel hot-rolled round steel bar special for a numerical control machine tool spindle and a preparation method of the 45 steel hot-rolled round steel bar. According to the preparation method of the 45 steel hot-rolled round steel bar special for the numerical control machine tool spindle and the bar prepared through the method, compared with a traditionally produced 45 steel hot-rolled round steel bar, the rolling cost of batch production is lower; the product quality is stable, and the round steel precision (namely out-of-roundness) is improved by more than one time; the process is high in applicability and controllability; and the product has excellent comprehensive mechanical and processing properties. And the requirements of the high-precision precision numerical control machine tool industry can be well met. 本发明属于黑色金属材料压力加工技术领域，具体涉及一种专供数控机床主轴用45钢热轧圆钢棒材及其制备方法。本发明通过专供数控机床主轴用45钢热轧圆钢