氮对灰铸铁的质量具有一定的影响。适量的氮能促进石墨形核，稳定珠光体，改善发铸铁组织，提高灰铸铁的性能。国外有人在这方面进行过试验，向铁水中加入赤血盐［KsFe（CN）e］作为氮添加剂，证实氮具有提高及铸铁性能的作用。另外，美国学者[1]试验过在沪前向铁水中加入Fe-Cr Nitrogen has a certain impact on the quality of gray cast iron. Appropriate amount of nitrogen can promote graphite nucleation, stabilize pearlite, improve the cast iron structure and improve the performance of gray iron. Some people abroad have conducted tests in this area, adding ferric salt [KsFe (CN) e] to molten iron as a nitrogen additive, confirming that nitrogen has an effect of improving the performance of cast iron. In addition, the American scholar [1] tried to add Fe-Cr to molten iron before Shanghai