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武钢一米七冷连轧机是七十年代的先进设备,其自动化程度高,轧制速度可达30米/秒,产品的尺寸精度及表面质量均有相当高的要求。因此,冷轧机工作辊的工作条件十分严格,如承受的最大轧制压力为2500吨,所以,对冷轧机工作辊的硬度、强度、韧性、耐磨性及抗事故能力都提出了很高的要求。曾对西德斯坦霍夫厂制造的冷轧锻钢工作辊作了检查,其表面硬度可达Hs 95;氧化物小于1级,硫化物1级;辊面显微组织为隐晶马氏体、细小均布的炭化物及少量的残余奥氏体;晶粒度11级;残余奥氏体量9％。金相组织见图1～2。超声波探伤时波形稳定,未发现任何缺陷波。可见,引进轧辊的质量是很好的。与之相比,我国冷轧辊是落后的,质量差,消耗很高,如鞍钢1961～1971年冷轧辊消耗平
WISCO one meter and seven tandem cold mill is the seventies advanced equipment, high degree of automation, the rolling speed of up to 30 m / s, the product of dimensional accuracy and surface quality have very high requirements. Therefore, the working conditions of the work roll of the cold rolling mill are very strict. For example, the maximum rolling pressure to be subjected is 2,500 tons. Therefore, the work roll hardness, strength, toughness, abrasion resistance and accident resistance of the cold rolling mill are proposed High demand. The cold-rolled forged steel work rolls made by the West German Hofmann factory were inspected and the surface hardness was up to Hs 95; the oxides were less than grade 1 and the grade of sulphides was 1. The microstructure of the rolls was cryptocrystalline martensite , Fine and uniform carbide and a small amount of residual austenite; grain size 11; retained austenite 9%. Metallography see Figure 1 ~ 2. Ultrasonic flaw detection waveform stability, did not find any defect wave. Visible, the introduction of the quality of the roll is good. In contrast, China’s cold roller is backward, poor quality, high consumption, such as the Anshan Iron and Steel 1961 ~ 1971 cold roll consumption