Abstract: By controlling billet temperature 780 ℃ as entering sizing mill,sizing reducing rate 42% (φ18.4 mm→ φ14 mm),cooling rate 0.42 ℃/s,the microstructure of 35CrMo steel hot-rolled rod is F+P,with ferrite content more than 40%,actual grain size 10- 11,tensile strength 750 MPa,reduction of area≥60%,and hardness value 214-225HV, to realize annealing-free large reduction of cross-sectional area cold drawing.

Key words: 35CrMo Cold Heading Steel , Hot Rolled Wire Rods , Controlled Rolling and Controlled Cooling , Annealing-Free

摘要： 通过入减定径温度780℃,入减定径减面率42%(φ18.4 mm→ φ14 mm),冷却速度0.42℃/s,35CrMo钢热轧材显微组织为F+P, 铁素体含量≥40%,实际晶粒度10～11级，抗拉强度≤750 MPa,断面收缩率≥60%,硬度值214～225HV, 实现免退火直接进行大减面率拉拔。

关键词: 35CrMo冷镦钢, 热轧盘条, 控轧控冷, 免退火