热机轧制对中碳冷镦钢组织和性能的影响

Effect of TMCP on Structure and Performance of Middle Carbon Cold Heading Steel

采用热机轧制(TMCP)工艺技术生产中碳冷镦钢SWRCH35K-M,增加了线材组织中铁素体的比例,并使珠光体组织部分粒状化,降低了线材强度和硬度,提高了塑性,且冷镦时金属流动性好、冷作硬化率低。用户可用其直接制作内六角螺栓和法兰面螺栓,免去球化退火工艺,取得明显的经济效益和环境效益。

Using thermo-mechanical control process （TMCP） to produce the wire rod of middle carbon cold heading steel SWRCH35K-M, the ferrite proportion and the granulated part of the pearlite in the microstructure are increased, thus decreasing tensile strength and hardness, improving plasticity and metal fluidity in cold heading. The spheroidal annealing process can be excused in producing various fasteners. It can save the energy, reduce the cost and orotect the environment.