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讨论了准14mm20MnSi穿水生产HRB500的工艺流程、化学成分、金相组织和力学性能,提出了合理的C含量控制目标。结果表明:准14mm20MnSi穿水生产HRB500钢筋时金相组织为:表层回火M,回火M厚度约为钢筋直径的1/8,中间依次形成B、F+P+B混合组织,心部为细小的F+P,F晶粒度为9.0～9.5级,与热轧钢筋相比,穿水钢筋心部P含量多,F晶粒度提高1.0级,钢筋力学性能符合HRB500的要求,达到了降低生产成本的目的。
The technological process, chemical composition, microstructure and mechanical properties of HRB500 for quasi - 14mm20MnSi wear are discussed, and the reasonable control of C content is proposed. The results show that the microstructure of HRB500 steel produced by quasi-14mm20MnSi is as follows: the surface is tempered M, the thickness of tempering M is about 1/8 of the diameter of the steel bar, and the mixed microstructure of B, F + P + B forms in the middle, Small F + P, F grain size of 9.0 to 9.5, compared with the hot-rolled steel, steel core piercing P content, F grain size increased by 1.0, the mechanical properties of steel in line with HRB500 requirements reached Reduce production costs.