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测试了高强韧性冷作模具ＬＤ１钢（７Ｃｒ７Ｍｏ３Ｖ２Ｓｉ）的ＴＴＴ及ＣＨＴ曲线，确定出等温退火、循环退火工艺，使该钢具有良好的被切削性和冷挤成型性，制定出适于不同冷冲模具的浮回火工艺。
The TTT and CHT curves of LD1 steel (7Cr7Mo3V2Si) with high strength and toughness were tested to determine the isothermal annealing and cyclic annealing process, which made the steel have good machinability and cold extrusion properties, Float back to the fire process.