在生产1100公斤重的高强度铸铁曲轴时,使用牌号 HBKP2(Ty14—15—5—74)精炼生铁进行了工业试验。采用精炼生铁作炉料可使球化处理前的铁水含硫量从0.03%降到0.004%。在壁厚不超过70毫米的曲轴中,为获得球状石墨,其最小含镁量为0.035%(采用一般生铁时为0.04%),从而耗镁量降低了30～40%。因原铁水成分和所需的残余镁量是变 In the production of 1100 kg heavy high-strength cast iron crankshafts, industrial tests were carried out using refined HBKP2 (Ty14-15-5-74) pig iron. The use of refined pig iron as a charge can reduce the sulfur content of hot metal before balling from 0.03% to 0.004%. In crankshafts with a wall thickness of up to 70 mm, the minimum magnesium content of 0.035% (0.04% for pig iron) is obtained for spherical graphite, resulting in a reduction in magnesium consumption of 30-40%. Due to the original hot metal composition and the required amount of residual magnesium is variable