模具鋼不銹鋼銅合金鋁合金鈦合金鎢鋼鎂合金易車鐵易車鋼高速鋼硬質合金工具鋼合金鋼紅銅黃銅彈簧鋼軸承鋼低碳鋼中碳鋼高碳鋼無磁鋼透氣鋼電磁不銹鋼電磁鋼圓棒鋼板卷料圓鋼研磨棒冷拉棒力學性能化學成份材質證明價格SGS報告4CR13C104545AL6061AL6063AL7075SCM435SGD400-DSWRCH45K40CRNIMOK-M31S230MO7PBJL-3160SI2MNGCR15AISI304AISI303