控制冷却对SWRH82B-1V高碳钢盘条组织和性能的影响

Effect of Controlling Cooling on Structure and Properties of Wire Coil of High Carbon Steel SWRH82B-1V

用Gleeble-2000热模拟机测定了V微合金化SWRH82B-1V钢(%:0.79C、0.23Si、0.63Mn、0.18Cr、0.05V、0.004 ON)热变形奥氏体连续冷却转变(CCT)曲线,并研究了冷却速度(1～15℃/s)对钢中索氏体和马氏体面积分数和HV硬度值的影响。通过改变斯泰摩尔生产线的冷却风量模式研究了冷却风量对SWRH82B-1V钢Φ12.5 mm盘条组织和力学性能的影响。结果表明,盘条吐丝温度880℃50%风量冷却可使该钢中索氏体组织≥90%,马氏体组织≤0.05%,盘条抗拉强度≥1130 MPa,断面收缩率≥30%。

The continuous cooling transformation （CCT） curves of deformed austenite of V microalloying steel SWRH82B-1V （%： 0. 79C, 0. 23Si, 0. 63Mn, 0. 18Cr, 0. 05V, 0.0040N） were measured by thermal simulator Gleeble- 2000 and the effect of cooling rate （ 1 - 15 ~C/s） on area fraction of sorbite and martensite in steel and HV hardness value of the steel was studied. And the effect of percentage of cooling wind at Stehnor production line on structure and mechanical properties of Φ12. 5 mm wire coil of steel SWRH28B-1V was studied by changing cooling mode. Results show that as the outlet temperature of finishing coil is 880 ℃, cooling with 50% wind rate, the area fraction of sorbite and martensite in the steel is respectively ≤90% and ≤0. 05%, and the tensile strength of the coil is ≥1 130 MPa while its area of reduction is ≥30%.