离心铸造高速钢轧辊在钢管张力减径机上的应用研究

Application Study on Centrifugally-cast HSS Roll to Steel Tube Stretch Reducing Mill

高速钢轧辊可以代替常用的合金铸铁轧辊和粉末冶金硬质合金轧辊,主要原因是低成本的合金铸铁轧辊耐磨性差,而高质量的硬质合金轧辊生产成本高。采用离心铸造方法开发出的高速钢轧辊硬度达HRC65～67,辊面硬度差小于2,冲击韧性大于16J/cm2。在钢管张力减径机上使用,高速钢轧辊的一次修磨轧制寿命为合金球墨铸铁轧辊的12倍,轧辊无碎裂和剥落现象,使用效果接近硬质合金轧辊,生产成本仅为后者的30%。

The HSS roll can be substituted for the conventional alloy cast iron roll and powder metallurgical carbide roll. It is known that though the alloy ca st iron roll is cost-effective, but not so wear-resistant, while the carbide one is of high quality, but costs too much. The centrifugally-cast HSS roll feature s so high hardness up to 65~67 HRC, the surface hardness difference under 2 and impact toughness over 16 J/cm2. For the steel tube stretch-reducing mill, the HS S roll has a service span during the redressing interval 12 times that of the al loy nodular cast iron roll, developing no crushing or peeling. Although the HSS roll is almost as effective as the carbide roll, its cost is only 30% of that of the latter.