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莱钢特殊钢厂采取 5 0 t U HP-EAF+5 0 t L F工艺生产德标 3 8Si7调质弹簧钢 ,经严格冶炼及轧制 ,钢锭合格率达99.2 % ,成材率达 92 .17% ,化学成分及机械性能均能满足德标 DIN172 2 1-72的要求
The special steel plant of Laiwu Steel adopts the 5 0 t U HP-EAF + 50 t LF process to produce German standard 3 8Si7 quenched and tempered spring steel. The qualified rate of steel ingot reaches 99.2% and the finished product rate reaches 92.17% , Chemical composition and mechanical properties can meet the requirements of German standard DIN172 2 1-72