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首钢第一线材厂在生产SWRH82B线材过程中,盘条检测芯部出现异常组织现象:珠光体与残余奥氏体共存、索氏体与网状铁素体共存、索氏体与马氏体共存。通过对生产数据跟踪和扫描电镜观测发现,在冶炼、连铸过程中不稳定操作,铸坯中溶质元素碳、锰和铬元素偏析,钢液铬合金元素熔解不均匀,碳、锰和铬综合作用明显提高奥氏体的稳定性,大大推迟了奥氏体向珠光体的转变时间,在A1～Acm温度之间时间相对较长,形成残余奥氏体组织和珠光体、索氏体共存的局面;钢中溶质元素富集造成吐丝温度与相变之前冷速过快,形成片层间距不同的屈氏体和马氏体快冷低温组织。
Shougang first wire factory in the production of SWRH82B wire rod, the wire rod detection of abnormal tissue organization: pearlite and residual austenite coexist sorbite and reticular ferrite coexist sorbite and martensite coexistence . Through the production data tracking and scanning electron microscopy observations found that in the smelting, continuous casting process unstable operation, the slab in the solute elements of carbon, manganese and chromium segregation element, the molten steel chromium alloy elements melt uneven, carbon, manganese and chromium composite The role of significantly improve the stability of austenite, delayed the austenite to pearlite transformation time, relatively long time between A1 ~ Acm temperature, the formation of retained austenite and pearlite and sorbite coexist Situation; the enrichment of solute elements in steel caused the cooling speed to be too high before the spinning temperature and the phase change, forming troostite and martensite fast cooling cold tissue with different lamellar spacing.