在毛主席“独立自主、自力更生”和“备战、备荒、为人民”的伟大战略方针指引下,在冶金和铸造生产中开始大量使用我国具有丰富资源的稀土合金。由于稀土元素具有脱硫去气,脱氧精炼;细化合金结晶组织,强化金属基体;改善非金属夹杂物的形状、大小和分布情况,从而减少这些夹杂物的有害影响;促使铸铁中石墨球化,所以是良好的孕育剂。稀土元素的这些良好性能能够大大改善铸铁、钢 Guided by the great strategic principle of “independence, independence and self-reliance” of Chairman Mao and preparations for war, preparation for war and for the people, he began to make extensive use of China’s abundant rare earth alloys in metallurgy and foundry production. As rare earth elements have desulfurization to the gas, deoxidation refining; refine the alloy crystal structure, strengthening the metal matrix; to improve the shape, size and distribution of non-metallic inclusions, thereby reducing the harmful effects of these inclusions; to promote the graphite ball of cast iron, So it is a good inoculant. These good properties of rare earth elements can greatly improve cast iron, steel