The material selected for this work was the spray formed Vanadis4 high alloy cold working mould steel （abbreviated to V4 steel）. Its microstructure, hot rolling process, and annealing treatment have been investigate...The material selected for this work was the spray formed Vanadis4 high alloy cold working mould steel （abbreviated to V4 steel）. Its microstructure, hot rolling process, and annealing treatment have been investigated. Observed from the optical and electron microscopes, the as-sprayed V4 steel had the finer microstructure of uniform and equiaxial grains ,while after hot rolling for densification and spheroidized annealing, the V4 steel obtained an excellent spheroidized structure that is favorable to subsequent quenching and tempering treatment. The spheroidized structure and level of annealed hardness of the V4 steel are almost the same as expensive imported powder metallurgy the V4 steel. It is difficult to produce V4 steel with the conventional ingot metallurgical technique, so the multi-step and high-cost powder metallurgy method is generally used at present. Compared to the powder metallurgy technique, using the spray forming technique to produce the V4 steel has obvious advantages and potential market competitiveness in reducing production costs, simplifying working process, and shortening the production cycle.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
介绍高速机车用301L不锈钢无缝管的研发情况。采用热穿孔工艺制备301L不锈钢荒管,再通过多道次的冷轧变形成功研制出Φ44mm×2 mm规格的无缝管材。结果表明:经过冷轧变形,钢管沿轧制方向产生了大量的马氏体组织,加工硬化明显;随后经...介绍高速机车用301L不锈钢无缝管的研发情况。采用热穿孔工艺制备301L不锈钢荒管,再通过多道次的冷轧变形成功研制出Φ44mm×2 mm规格的无缝管材。结果表明:经过冷轧变形,钢管沿轧制方向产生了大量的马氏体组织,加工硬化明显;随后经950℃固溶处理、再结晶充分,晶粒均匀。开发的301L不锈钢无缝管的化学成分、组织及性能均满足ASTM A 666-2015标准要求。展开更多
文摘The material selected for this work was the spray formed Vanadis4 high alloy cold working mould steel （abbreviated to V4 steel）. Its microstructure, hot rolling process, and annealing treatment have been investigated. Observed from the optical and electron microscopes, the as-sprayed V4 steel had the finer microstructure of uniform and equiaxial grains ,while after hot rolling for densification and spheroidized annealing, the V4 steel obtained an excellent spheroidized structure that is favorable to subsequent quenching and tempering treatment. The spheroidized structure and level of annealed hardness of the V4 steel are almost the same as expensive imported powder metallurgy the V4 steel. It is difficult to produce V4 steel with the conventional ingot metallurgical technique, so the multi-step and high-cost powder metallurgy method is generally used at present. Compared to the powder metallurgy technique, using the spray forming technique to produce the V4 steel has obvious advantages and potential market competitiveness in reducing production costs, simplifying working process, and shortening the production cycle.
文摘介绍高速机车用301L不锈钢无缝管的研发情况。采用热穿孔工艺制备301L不锈钢荒管,再通过多道次的冷轧变形成功研制出Φ44mm×2 mm规格的无缝管材。结果表明:经过冷轧变形,钢管沿轧制方向产生了大量的马氏体组织,加工硬化明显;随后经950℃固溶处理、再结晶充分,晶粒均匀。开发的301L不锈钢无缝管的化学成分、组织及性能均满足ASTM A 666-2015标准要求。
