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本文介绍一种新型高强韧性冷作模具钢——Cr7Mo3V2Si(代号LD),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、变形小等特点。抗弯强度比Cr12MoV钢高出将近一倍,比W6Mo5Cr4V2钼高速钢高出50～80kgf/mm~2,挠度和冲击韧性比Cr12MoV和W6Mo5Cr4V高出二～三倍。机械性能达到了国外同类型钢种(美国专利)的水平。经冷镦、冷挤、冷冲等几十种模具在生产上应用及试用都取得了较长的使用寿命。尤其是M12六角螺栓冷镦模平均寿命达52.4万件,达到了美国资料报导的同类模具50万件寿命的先进水平。
This article introduces a new high strength and toughness cold work die steel - Cr7Mo3V2Si (code-named LD), which has high strength, good toughness, wear resistance, excellent process performance, heat treatment temperature range, small deformation and so on. The flexural strength is almost double that of Cr12MoV steel and 50 ~ 80kgf / mm ~ 2 higher than that of W6Mo5Cr4V2 molybdenum high speed steel. The deflection and impact toughness are two to three times higher than those of Cr12MoV and W6Mo5Cr4V. Mechanical properties have reached the level of the same type of foreign steel (US patent). The cold heading, cold extrusion, such as cold-red die in the production of dozens of applications and trials have achieved a longer life. In particular, the M12 hexagonal bolt cold heading die average life expectancy of 524,000, reaching the United States reported the same type of mold 500,000 advanced level of life expectancy.