軟件：機械設備組成用低不銹鋼鋼SCM421型可以用在剛材：SCM421型H方鋼管，SCM421H方鋼管筋，SCM421H方鋼管絲桿，SCM421H方鋼管板，SCM421H方鋼管板，SCM421H方鋼管帶SCM421工字鋼標淮：JIS G4053SCM421工字鋼材品類：鉻鉬鋼的標準： JIS G 4053：機械廠成分用低耐熱馬氏體不銹鋼CHEMICAL COMPOSITION (Mass weight - %)C (％):  0.17 ~ 0.23Si (%):  0.15 ~ 0.35Mn (％): 0.70 ~ 1.00P (％)≤: 0.030S (％)≤: 0.030Cr (%):  0.90 ~ 1.20Ni (%):  ≤ 0.25Mo (%):  0.15 ~ 0.25Cu (%):  ≤ 0.30用： 按照熱軋鋼、熱鍛和熱撞擊制造出的機制成分用低碳素鋼鋼