4j29合金材料成分，4j9合金

牌号3J440 旧牌号3J40对应GB/T 37797-2019标准精密合金牌号精密合金-名称分类合金钢性能弹性耐腐蚀性能标签精密合金弹磁合金镍铬合金说明 特性：耐冲击、耐磨轴尖弹性合金、无磁、耐冲击、耐磨损。 用途：制造仪器、仪表的轴尖。 适用标准YB/T 5243-1993（2005 年确认） 类型：冷拔线材 适用范围：本标准规定了精密合金系统分类和牌号的一般原则。本标准适用于精密合金牌号的命名及各牌号化学成分的一般规定。牌号后缀：C-磁头， ) 成分Fe C Si Mn P S Cr Al Ce * 其他最小值- - - - - - 39 3.3 0.1 Ni: 最大余量0.5 0.03 0.2 0.1 0.01 0.01 41 3.5 0.2

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