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铸造半铜含碳1.3～2.4%,是介于钢和铁之间的一种材质。用它制造的轧辊由于从轧辊辊身表面到心部硬度落差很小,因而特别适合制造辊身带有孔型的型铜轧辊。但这种材质轧辊铸造过程易出现粗大的碳化物,利用热处理难于解决。在半钢轧辊的热轧过程中粗大的碳化物受热应力、热冲击破碎、脱落造成辊面缺陷被迫停止使用,另外、冲击韧性低弓断辊。为了改善这种状况,在半铜轧辊中加入稀土后取得预期效果。
Casting semi-copper carbon 1.3 to 2.4%, between steel and iron is a material between. Rollers manufactured therefrom have a small drop in hardness from the surface of the roll body to the core, making them particularly suitable for the manufacture of roll-type copper rolls having a hole shape. However, this material roll casting process prone to coarse carbides, the use of heat treatment is difficult to solve. In the semi-steel roll hot rolling process of coarse carbide by thermal stress, thermal shock crushing, falling off the surface defects caused by forced to stop using the other, the impact toughness low bow broken roller. In order to improve this situation, the rare earth is added to the semi-copper roll to obtain the desired effect.