“LD”钢是7Cr7Mo2V2Si钢的代号,是最近几年我所与大冶钢厂、本溪一钢厂等单位研制成功的一种新型高强韧性模具钢。它具有强度高、韧性好、耐磨损、工艺性能优良、热处理温度范围宽、变形小等优点。经几年来生产应用证明,在冷镦、冷挤、冷冲等模具上取得了显著的效果。 “LD” steel is the code of 7Cr7Mo2V2Si steel, which is a new type of high strength and toughness die steel successfully developed by our company and Daye Steel Mill and Benxi Steel Mill in recent years. It has high strength, good toughness, wear resistance, excellent process performance, heat treatment temperature range, small deformation and so on. After several years of production and application shows that in the cold heading, cold extrusion, such as cold punch achieved significant results.