弹簧钢SUP12 SUP13进口弹簧锰钢薄板料
45# 70# 72A 72..
弹簧钢SUP12 SUP13..
弹簧钢SUP10 SUP11..
弹簧钢SUP9 SUP9A进..
弹簧钢SUP6 SUP7进口..
弹簧钢60Si8 61SiC..