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为了在CSP产线上开发新一代经济型热轧双相钢,并确定生产的最佳成分和工艺,介绍了在武钢CSP生产线进行580MPa级热轧双相钢的工业化生产试制情况。分别采用C-Mn-Si系和C-Mn-Si-Cr系钢为原料,通过控制轧制和基于超强冷却设备的控制冷却工艺,成功开发出抗拉强度580MPa级热轧双相钢。通过比较分析2种成分钢的力学性能和微观组织,结果表明:经济型的C-Mn-Si系钢相对于C-Mn-Si-Cr系钢具有屈服强度低、屈强比小、伸长率大的特点,虽然马氏体量相对较少,但具有马氏体呈岛状更加均匀分布在铁素体晶界上等典型双相钢的特征,同时提出了生产过程中控制铁素体析出量和促进马氏体形成的具体措施。
In order to develop a new generation of economical hot-rolled dual-phase steel on the CSP production line and determine the optimum composition and process of production, the trial production of 580MPa-class hot-rolled dual-phase steel in Wuhan WISCO CSP production line was introduced. C-Mn-Si and C-Mn-Si-Cr steels were respectively used as raw materials. The 580MPa-class hot-rolled dual-phase steel with tensile strength of 580MPa was successfully developed by controlled rolling and controlled cooling process based on super-cooling equipment. By comparing the mechanical properties and microstructure of two kinds of steel, the results show that the economical C-Mn-Si steels have lower yield strength and lower yield ratio than C-Mn-Si-Cr steels, Although the amount of martensite is relatively small, it has the characteristic of martensite being more evenly distributed on the ferrite grain boundaries such as the typical dual phase steel. At the same time, it is proposed that the control of ferrite Precipitation and promote the formation of martensitic concrete measures.