哪些钢材牌号适用于重型机械的弹簧制造?答:宝钢合金结构钢CENA1, DAC, SKD4, SKD5, SKD7, SKD8, SKT4, SK3, SK4, SK5, SKS3, SKD11, YEM, YEM-K, DAC45, SKD61, SKD62, FDAC, DAC10, DAC55, SLD, SLD8, SLD10, ARK1, SGT, YXM1, YXM4, YXR3, YXR33, SKH-9, SKH-51, SKH-55, SKH-57, SKH-59, HAP10, HAP40, ...