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铝不仅是以一种强脱氧剂而加入钢中,且由于它在一定的温度下铝和氮化合后生存的A1N这种细小弥散分布的难熔化合物能使钢的晶粒得到细化。同时,还能固定钢中的氮和氧,因而可以减轻钢对缺口的敏感性,当钢中加入少量铝时,可以提高钢在低温条件下的冲击韧性,并能减少或消除钢的时效现象。铝作为合金化元素加入钢中能够显著提高钢的抗氧化性能和耐腐蚀性能。因此,国内外在不断发展铬铝系钢,铁
Aluminum is added not only to steel as a strong deoxidizer, but also to grain refinement of the steel due to its finely dispersed, refractory compounds such as A1N, which survive the heat treatment of aluminum and nitrogen at a certain temperature. At the same time, it can also fix the nitrogen and oxygen in the steel, so it can reduce the sensitivity of the steel to the gap. When a small amount of aluminum is added into the steel, it can improve the impact toughness of the steel under the condition of low temperature and can reduce or eliminate the aging phenomenon of the steel . Aluminum as an alloying element added to the steel can significantly improve the oxidation resistance of steel and corrosion resistance. Therefore, at home and abroad continue to develop chromium-aluminum-based steel, iron