粉冶高速钢PM高速钢CPM-M4高速钢棒材
冶金粉末高速钢，简称粉冶高速钢,或PM高速钢。采用粉末冶金方法（雾化粉末在热态下进行等静压处理）制得致密的钢坯，再经锻、轧等热变形而得到的高速钢型材,简称粉末高速钢。粉末高速钢组织均匀,晶粒细小,消除了熔铸高速钢难以避免的偏析,因而比相同成分的熔铸高速钢具有更高的韧性和耐磨性，同时还具有热处理变形小、锻轧性能和磨削性能良好等优点。粉末高速钢中的碳化物含量大大超过熔铸高速钢的允许范围，使硬度提高到 HRC67以上，从而使耐磨性能得到进一步提高。如果采用烧结致密或粉末锻造等方法直接制成外形尺寸接近成品的刀具、模具或零件的坯件，更可取得省工、省料和降低生产成本的效果。粉末高速钢的价格虽然高于相同成分的熔铸高速钢，但由于性能优越、使用寿命长，用来制造昂贵的多刃刀具如拉刀、齿轮滚刀、铣刀等，仍具有显著的经济效益。
High speed steel since 1900, the production of high speed steel is used mostly traditional metallurgical method, namely, ingot casting and forging rolling technology. Owing to the high amount of alloy steel, the chemical composition is complex, ingot casting - size, cooling speed slow and so on, during the solidification will inevitably produce the coarse ledeburite organization carbide segregation. Carbide segregation is a serious quality problems that exist in the high speed steel, segregation is not only to steel forging, rolling and hot working cause difficulties, but also obviously damage the properties of the steel, and limits the increase of high speed steel alloy content, impact on the development of high speed steel.
产品名称：粉冶高速钢PM高速钢CPM-M4高速钢棒材
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