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通过热模拟和工业轧制试验研究了分别添加(质量分数)0.35%的Ni和Mo对焊丝钢盘条组织和强度的影响。结果表明,含Ni焊丝钢的相转变温度区间为600~750℃,产生马氏体-残留奥氏体(M-A)组元和贝氏体(B)的临界冷速分别为0.8℃/s和2.0℃/s;含Mo焊丝钢的相转变区间约为480~640℃,且在0.1℃/s的冷速下已发生B和M-A转变。在相同热轧工艺条件下,含Mo焊丝钢盘条比含Ni焊丝钢的硬度高约50 HV5,强度高约150 MPa。
The effects of addition of Ni and Mo (mass fraction) 0.35% on the wire rod structure and strength of wire were investigated by thermal simulation and industrial rolling tests. The results show that the phase transformation temperature range of Ni-containing wire is 600-750 ℃, and the critical cooling rates of martensite-retained austenite (MA) and bainite (B) are 0.8 ℃ / s and 2.0 ℃ / s. The phase transformation range of Mo-containing wire steel is about 480-640 ℃, and B and MA transformation have occurred at the cooling rate of 0.1 ℃ / s. Under the same hot rolling conditions, the wire rod containing Mo wire has a hardness of about 50 HV5 higher than that of the Ni-containing wire steel and the strength is about 150 MPa.