The existing problems in the manufacture of SWRH82B high carbon steel wire were discussed by sampling and testing the microstructure and properties of the steel from the workshop. To solve the problems, the experiment...The existing problems in the manufacture of SWRH82B high carbon steel wire were discussed by sampling and testing the microstructure and properties of the steel from the workshop. To solve the problems, the experimental parameters for thermal simulation were optimized, and the thermal simulating experiments were carded out on a Gleeblel500 thermal simulator. The process parameters for the manufacture were optimized after analysis of the data, and the productive experiments were performed after the water box in front of the no-twist blocks was reconstructed, to control the temperature of the loop layer. The results from the productive experiments showed that the cooling rate of 10-15℃/s was reasonable before phase transformation, about 5℃/s during phase transformation, and 600-620℃ was the suitable starting temperature for phase transformation. The ultimate strength of the Ф11.0 mm wire was increased to 1150-1170 MPa with an increase of 20-30 MPa, the percentage reduction of section was to 34%-36% with an increase of 1%-3% by testing the finished products after reconstruction.展开更多
通过光学显微镜、能谱仪等分析了Φ12.5 mm 82B盘条笔尖状断口形成的原因和断裂机理。结果表明:盘条芯部的C、Mn元素偏析是产生笔尖状断口的主要原因。通过优化过程控制参数,可将钢丝的C偏析系数由原来的1.35下降至1.09,Mn偏析系数由原...通过光学显微镜、能谱仪等分析了Φ12.5 mm 82B盘条笔尖状断口形成的原因和断裂机理。结果表明:盘条芯部的C、Mn元素偏析是产生笔尖状断口的主要原因。通过优化过程控制参数,可将钢丝的C偏析系数由原来的1.35下降至1.09,Mn偏析系数由原来的1.30下降至1.08,笔尖状断口出现几率也随之降低。展开更多
针对某产线在生产ϕ12.0~ϕ13.0 mm 82B高碳钢盘条时网状渗碳体超标、轧制速度受限和尺寸波动较大等问题,对预精轧和精轧机组的孔型配置进行了优化,合理调整了延伸系数和堆拉系数,在不改造风机、飞剪等工艺设备的情况下,提高了水箱和斯太...针对某产线在生产ϕ12.0~ϕ13.0 mm 82B高碳钢盘条时网状渗碳体超标、轧制速度受限和尺寸波动较大等问题,对预精轧和精轧机组的孔型配置进行了优化,合理调整了延伸系数和堆拉系数,在不改造风机、飞剪等工艺设备的情况下,提高了水箱和斯太尔摩风冷线的冷却能力,改善了盘条组织,并且提升了轧制速度和产品尺寸精度。盘条的抗拉强度均值不小于1 180 MPa,断面收缩率均值不小于36%,索氏体率不小于85%,晶粒度在7级及以上,消除了2.0级以上的网状渗碳体,实现了82B高碳钢盘条的稳定批量生产。展开更多
文摘The existing problems in the manufacture of SWRH82B high carbon steel wire were discussed by sampling and testing the microstructure and properties of the steel from the workshop. To solve the problems, the experimental parameters for thermal simulation were optimized, and the thermal simulating experiments were carded out on a Gleeblel500 thermal simulator. The process parameters for the manufacture were optimized after analysis of the data, and the productive experiments were performed after the water box in front of the no-twist blocks was reconstructed, to control the temperature of the loop layer. The results from the productive experiments showed that the cooling rate of 10-15℃/s was reasonable before phase transformation, about 5℃/s during phase transformation, and 600-620℃ was the suitable starting temperature for phase transformation. The ultimate strength of the Ф11.0 mm wire was increased to 1150-1170 MPa with an increase of 20-30 MPa, the percentage reduction of section was to 34%-36% with an increase of 1%-3% by testing the finished products after reconstruction.
文摘通过光学显微镜、能谱仪等分析了Φ12.5 mm 82B盘条笔尖状断口形成的原因和断裂机理。结果表明:盘条芯部的C、Mn元素偏析是产生笔尖状断口的主要原因。通过优化过程控制参数,可将钢丝的C偏析系数由原来的1.35下降至1.09,Mn偏析系数由原来的1.30下降至1.08,笔尖状断口出现几率也随之降低。
文摘针对某产线在生产ϕ12.0~ϕ13.0 mm 82B高碳钢盘条时网状渗碳体超标、轧制速度受限和尺寸波动较大等问题,对预精轧和精轧机组的孔型配置进行了优化,合理调整了延伸系数和堆拉系数,在不改造风机、飞剪等工艺设备的情况下,提高了水箱和斯太尔摩风冷线的冷却能力,改善了盘条组织,并且提升了轧制速度和产品尺寸精度。盘条的抗拉强度均值不小于1 180 MPa,断面收缩率均值不小于36%,索氏体率不小于85%,晶粒度在7级及以上,消除了2.0级以上的网状渗碳体,实现了82B高碳钢盘条的稳定批量生产。
