Due to its high hardness,good red hardness and excellent wear resistance at high temperature,high speed steel(HSS)is fit for the roll manufacture.In order to overcome the segregation of centrifugal casting of HSS roll...Due to its high hardness,good red hardness and excellent wear resistance at high temperature,high speed steel(HSS)is fit for the roll manufacture.In order to overcome the segregation of centrifugal casting of HSS roll,die-cast processes were developed and its effects on the properties of the HSS roll were investigated.It was found that pressure,pressing time and speed are three important factors affecting shrinkage cavity.For pouring temperature of 1 400-1 450 ℃,pressure of 150-160 MPa,pressing time of 120-150 sand pressing speed of 14-16mm/s,a compact HSS roll was obtained,which has no segregation and small working allowance.In the high speed wire rod rolling mill,service life of the HSS roll is 5to 8times longer than that of high nickel chromium infinite chilled cast iron roll.展开更多
Cr12MoV扁钢主要采用模铸钢锭、多火次锻造、轧制成材的长流程工艺,生产效率低、成材率低、成本高、能耗高。为了解决冷作模具钢的导热性和塑性较差等问题,设计了90 t EBT-LF-VD-150 mm×630 mm连铸矩形坯和一火加热+15道次轧制成...Cr12MoV扁钢主要采用模铸钢锭、多火次锻造、轧制成材的长流程工艺,生产效率低、成材率低、成本高、能耗高。为了解决冷作模具钢的导热性和塑性较差等问题,设计了90 t EBT-LF-VD-150 mm×630 mm连铸矩形坯和一火加热+15道次轧制成材的短流程工艺,成功开发Cr12MoV钢矩形连铸坯及轧制19 mm厚扁钢产品,连铸坯中心疏松1.5级,中心偏析≤1.0级,成品扁钢共晶碳化物不均匀级别≤3级,探伤质量等级达到A级,各项性能指标均满足标准要求。Cr12MoV冷作模具钢产品实现批量生产,取得了良好的经济效益。展开更多
基金Item Sponsored by Provincial Natural Science Foundation of Henan of China(2003460001)University Young Backbone Teacher Fund of Henan ProvinceTackle-Key-Program of Science and Technology Committee of Henan Province(0424260002)
文摘Due to its high hardness,good red hardness and excellent wear resistance at high temperature,high speed steel(HSS)is fit for the roll manufacture.In order to overcome the segregation of centrifugal casting of HSS roll,die-cast processes were developed and its effects on the properties of the HSS roll were investigated.It was found that pressure,pressing time and speed are three important factors affecting shrinkage cavity.For pouring temperature of 1 400-1 450 ℃,pressure of 150-160 MPa,pressing time of 120-150 sand pressing speed of 14-16mm/s,a compact HSS roll was obtained,which has no segregation and small working allowance.In the high speed wire rod rolling mill,service life of the HSS roll is 5to 8times longer than that of high nickel chromium infinite chilled cast iron roll.
