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通常用60Si2Mn制作各种弹簧。由于该钢具有良好的强度、疲劳极限和塑性,近年来其用途已扩大到冷镦模具。本研究所采用的工艺用于冷镦模具作M10六角螺母下冲模,使用寿命达18万件,大大超过Cr12Mo V和LD模具钢(5～7万件)。一、试验方法试验用钢为60Si2Mn热轧棒材,其化学成分为:0.59％C,1.94％Si,0.79％Mn,0.023％S,0.008％P。转变点Ac_1 760℃、Ac_3 810℃、M_s 255℃。棒材锻成12×12毫米方料,进行快速球化退火,制成试样。压缩试样φ10×15毫米、弯曲试样6×6×100毫
60Si2Mn usually make all kinds of spring. As the steel has good strength, fatigue limit and plasticity, its use has been extended to cold heading dies in recent years. The process used in this study is a cold heading die for M10 hexagon nut under-die, with a service life of 180,000 pieces, which greatly exceeds Cr12Mo V and LD die steel (500 ~ 700,000 pieces). First, the test method Test steel 60Si2Mn hot-rolled bar, the chemical composition: 0.59% C, 1.94% Si, 0.79% Mn, 0.023% S, 0.008% P. Transition point Ac_1 760 ° C, Ac_3 810 ° C, M_s 255 ° C. Bar forging into 12 × 12 mm square material, rapid ball annealing, made of the sample. Compression specimen φ10 × 15 mm, bending specimen 6 × 6 × 100 毫米