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S 321 Mn1.3 Al Rem. Good corrosion resistance, weldability and ductility. Gas welding and argon arc welding of aluminum alloys. 良好的耐蚀性、可焊性及塑性。铝合金气焊、氩弧焊用 S 331 Mg5 Mn0.4 Al Rem. Corrosion resistance and high strength. Argon arc welding of aluminum alloys. 耐蚀,强度高。铝合金氩弧焊用 ER5183