轧后穿水冷却对热轧钢材组织性能的影响
Influence of Throng-water Cooling After Rolling on Microstructure and Properties of Hot-rolled Steel
王艳林, 郭海清, 方 明, 张 迟
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作者单位：(方大特钢科技股份有限公司, 江西 南昌 330012)
中文关键字：穿水冷却； 热轧钢材； 微观组织； 性能
英文关键字：throng-water cooling; hot-rolled steel; microstructure; properties
中文摘要：在相同变形量、变形温度以及微量合金元素条件下，研究轧后穿水冷却对热轧钢材组织性能的影响，并与轧后空冷状态下的组织性能进行比较。结果表明：轧后空冷状态下的钢材边部组织为铁素体 + 珠光体，心部组织也为铁素体加珠光体，心部晶粒度等级约为7.0级；轧后穿水冷却下的钢材边部组织为回火索氏体，心部组织为铁素体 + 珠光体，晶粒度等级约为8.5级，其淬透层深度为1.60 mm；轧后穿水冷却的热轧钢材的伸长率为22.68%，与空冷的24.30%基本相等，但其屈服强度提高了39.20%，抗拉强度提高了23.23%。
英文摘要：The influences of throng-water cooling after rolling on the microstructure and properties of the hot-rolled steel were studied under the same deformation amount, deformation temperature and micro-alloying elements, which were compared with the microstructure and properties of hot-rolled steel in the air-cooling after rolling. The results show that the edge microstructure of hot-rolled steel under the air-cooling after rolling is ferrite and pearlite, the core microstructure is also ferrite and pearlite, and the grain size scale is 7.0; the edge microstructure of hot-rolled steel under the throng-water cooling after rolling is tempered sorbite, the core microstructure is ferrite and pearlite, the grain size scale is 8.5, and the depth of hardening is 1.60 mm; the elongation of hot-rolled steel under the throng-water cooling after rolling is 22.68%, which is basically equal with the hot-rolled steel under air-cooling, but the yield strength increases by 39.20%, the tensile strength increases by 23.23%.