φ70 mm 45钢轧后穿水冷却的试验研究  

Experimental Study on φ70 mm 45 Steel by Water Cooling after Rolling

作　　者：梁佰战[1] 唐宁 王子建 陈坤 赵刚 LIANG Baizhan;TANG Ning;WANG Zijian;CHEN Kun;ZHAO Gang(Technology Center,Huaigang Special Steel Co.,Ltd.,Jiangsu Shagang Group,Huai'an 223002,China;Rolling Plant,Huaigang Special Steel Co.,Ltd.,Jiangsu Shagang Group,Huai'an 223002,China;Examination Center,Huaigang Special Steel Co.,Ltd.,Jiangsu Shagang Group,Huai'an 223002,China)

机构地区：[1]江苏沙钢集团淮钢特钢股份有限公司技术中心,江苏淮安223002 [2]江苏沙钢集团淮钢特钢股份有限公司轧钢厂,江苏淮安223002 [3]江苏沙钢集团淮钢特钢股份有限公司检测中心,江苏淮安223002

出　　处：《热加工工艺》2022年第9期60-63,共4页Hot Working Technology

摘　　要：在自制穿水冷却装置上进行了φ70 mm 45钢轧后穿水工业化试验,对比研究了轧后穿水冷却对钢力学性能和显微组织的影响。结果表明:穿水后钢材的抗拉强度和屈服强度均一定程度提高,其中抗拉强度由630 MPa提高到659 MPa,屈服强度由345 MPa提高到365 MPa,但其伸长率、断面收缩率和热轧硬度均未明显提高。当穿水后钢材表面温度降至730~680℃时,钢材表面局部区域开始出现魏氏体和大颗粒珠光体;当穿水后钢材表面温度降至680~553℃时,钢材表面出现粒状贝氏体和块状珠光体。除了表层显微组织存在显著差异外,强弱冷却对于钢材1/2半径和心部两个区域的显微组织作用较小。The industrial experiment of φ70 mm 45 steel by water-piercing cooling after rolling was carried out in self-made water-piercing equipment, and the effect of water-piercing cooling after rolling on mechanical properties and microstructure were comparatively studied. The results show that the tensile strength and yield strength of the steel after water-piercing are increased to a certain extent, in which the tensile strength is increased from 630 MPa to 659 MPa, the yield strength is increased from 345 MPa to 365 MPa, but the elongation, reduction of area and hot rolling hardness have no significant increase. When the temperature of the steel surface drops to 730-680℃ after water-piercing, Widmanite and large pearlite begin to appear in local areas of the steel surface;when the surface temperature of the steel drops to 680-553℃ after water-piercing, granular Bainite and massive Pearlite appear on the surface of the steel. In addition to significant difference in the surface microstructure, strong and weak cooling has a small effect on the microstructure of 1/2 radius and the core area of the steel.

关 键 词：45钢 穿水冷却 轧制 

分 类 号：TG335.61[金属学及工艺—金属压力加工]