VOD冶炼超低碳马氏体不锈钢

VOD refining of ultra-low carbon martensitic stainless steel

利用40tVOD精炼炉脱碳冶炼00Cr13Ni4Mo超低碳马体不锈钢.通过合理控制炉内参数得到,吹氧时炉内真空度在26660Pa左右,停吹氧时真空度在7998Pa;开吹温度控制在1600℃左右,停吹温度在1750～1800℃左右;开吹时提高供氧强度至570Nm3·h-1左右,吹炼后期降低供氧强度至550Nm3·h-1左右,可以避免铬的大量氧化;控制氧枪高度在75mm;开吹供氩强度控制在48.4NL3·min-1,提高低碳区供氩量至117.5NL3·min-1,用以加快钢包内钢水环流速度.

The 00Cr13Ni4Mo ultra low-carbon martensitic stainless steel was decarbonization refined by a 40 t VOD. The vacuum degree,temperature,supplying oxygen intensity,and argon intensity were controlled as about 26 660 Pa,1 600 ℃,570 Nm3·h-1,and 48.4 NL3·min-1,respectively,during inputting oxygen by regulating the optimal parameters in the furnace. However,after finishing blowing oxygen,these four parameters changed to 7 998 Pa,1 750 to 1 800 ℃,550 Nm3·h-1,and 117.5 NL3·min-1,respectively. The height of oxygen lance was controlled as 75 mm. It should be pointed that the increase of supplying argon intensity at the same stage can expedite the circular speed of molten steel in the ladle.