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将Nb微合金化技术和控制轧制、控制冷却技术进行综合应用,开发出了具有成本优势的HRB400钢筋。介绍了产品开发的技术思路、成分设计、生产工艺路线、冶炼和连铸工艺和轧制工艺。在20 MnSi成分的基础上,添加0.008%~0.028%的Nb,可生产单线轧制的φ12~φ25 mm HRB400钢筋;添加0.021%~0.036%的Nb、0.010%~0.027%的Ti,可生产单线轧制的φ28~φ32 mm和切分轧制的φ16~φ20 mm HRB400钢筋。轧制时钢筋上冷床温度宜控制为810~870℃。钢筋的组织为铁素体+珠光体或铁素体+珠光体+少量贝氏体,表面无自回火组织。
The Nb microalloying technology and control rolling, cooling technology to control the integrated application, has developed a cost advantage HRB400 steel. Introduced the product development technology, composition design, production process route, smelting and continuous casting process and rolling process. On the basis of 20 MnSi, addition of 0.008% ~ 0.028% Nb can produce single-wire rolled φ12 ~ φ25 mm HRB400 rebar; adding 0.021% ~ 0.036% Nb and 0.010% ~ 0.027% Rolled φ28 ~ φ32 mm and split rolling φ16 ~ φ20 mm HRB400 steel. Rolling temperature on the steel cooling bed should be controlled for the 810 ~ 870 ℃. Reinforcing the organization of ferrite + pearlite or ferrite + pearlite + a small amount of bainite, the surface without self-tempering the organization.