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多数工厂的铸钢车间在钢包中加入铝(0.2～1kg/t_(钢水))对钢水终脱氧,以细化晶粒组织和防止疏松.但是,脱氧中会形成锐角的、十分坚硬的刚玉(Al_2O_3)和尖晶石(Al_2O_3·MgO)夹渣,使应力强烈集中,降低钢的冲击韧性和延性.此外,含氮钢还必须形成氮化铝.这种氮化铝在约1000℃时从固体钢沿初晶晶界析出,导致晶间脆性破坏和岩石状断口.
In most steel plant shops, aluminum (0.2-1 kg / t_ (molten steel)) is added to the ladle to deoxidize the molten steel to refine the grain structure and prevent porosity. However, the formation of acute-angle, very hard corundum Al 2 O 3) and spinel (Al 2 O 3 .MgO) inclusions, so that the stress concentration, reducing the impact toughness and ductility of steel.In addition, the nitrogen-containing steel must also form aluminum nitride. This aluminum nitride at about 1000 ℃ from Solid steel precipitation along the primary grain boundaries, resulting in intergranular brittle fracture and rock-like fracture.