唐山钢厂的小型轧钢导板消耗量一直很大,每班要更换2～3次以上。以后,试制了稀土白口铁导板。试用结果表明,在白口铁导板中加入0.15～0.25％的稀土铁合金(1号合金),使用寿命可提高一倍,轧制普通钢材时其效果更为显著。该厂先后试验三次,共铸出39副导板,成品导板15副,大扁导板24副。原料为:白口铁50％,回炉铁50％。其成分如下: Small-scale steel rolling guide consumption of Tangshan Steel has been great, each class to be replaced 2 to 3 times or more. Later, trial production of rare earth white iron guide plate. The trial results show that adding 0.15 ~ 0.25% rare earth alloy (No. 1 alloy) to the white iron guide plate can prolong the service life, and the effect is more remarkable when the ordinary steel is rolled. The factory has tested three times, a total of 39 lead casting, finished guide 15, large flat guide 24. Raw materials: white iron 50%, 50% iron back. Its composition is as follows: