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近年来,我国每年还进口一定数量的高速钢。主要进口国有日本、奥地利、西德和瑞典等。基本上都是 W_6Mo_5Cr_4V_2,以冷拉钢丝和φ20毫米以下的热轧小圆钢居多。为了能对进口高速钢作恰当的热处理,以充分发挥其性能,必须全面了解进口高速钢的冶金质量和使用性能,为此对进口高速钢的技术质量作了一些试验分析,并将结果与同类型国产高速钢作了对比。此外,还进行了若干包括技术标准的对外技术座谈。现就以W_6Mo_5Cr_4V_2高速钢为例,对钢的成分优化控制问题,进行一些探讨。我们对国内外高速钢的化学成分作了对比,发现在设计成份方面,两者差别不大;只有西德和奥地利标准中,含碳量的下限提高了0.04%,与碳成配比关系的 W 及 Mo 等元素含量的下限也相应提高了0.50%及0.2%,具体的化学成分如表1:
In recent years, China also imports a certain amount of high-speed steel every year. The main importing countries are Japan, Austria, West Germany and Sweden. Basically W_6Mo_5Cr_4V_2 to cold-drawn steel wire and φ20 mm below the majority of hot-rolled small steel. In order to make proper heat treatment of imported HSS in order to give full play to its performance, it is necessary to fully understand the metallurgical quality and serviceability of imported HSS. Based on this, some experimental analyzes on the technical quality of imported HSS are made, Type of domestic high-speed steel made a contrast. In addition, a number of external technical seminars including technical standards were conducted. Now W_6Mo_5Cr_4V_2 high-speed steel, for example, the composition of steel to optimize the control problems, some discussions. We compared the chemical composition of high-speed steel at home and abroad and found no significant difference in terms of design composition; only the lower limit of carbon content in the West Germany and Austria standards increased by 0.04% W and Mo and other elements of the lower limit of the corresponding increase of 0.50% and 0.2%, the specific chemical composition shown in Table 1: