16.5 - 18.5 %
2 - 2.5 %
10 - 13 %
Construction industry, Chemical industry, Decorative purposes and kitchen equipment, Petroleum industry/Petrochemical industry, Food industry, Mechanical engineering, Automotive industry
Very Good - Acidur 4401 shows a very good corrosion resistance in the presence of chlorides. Acidur 4401 shows excellent corrosion resistance in natural environmental media as well as in industrial areas with moderate chlorine and salt concentrations, in the food industry and in the agricultural food sector. However, according to DIN EN ISO 3651 part 2, Acidur 4401 is not resistant to intergranular corrosion. There is also no resistance to seawater.
Machinability of the Acidur 4401 is harder than Acidur 4404 due to higher carbon content.
Solution annealing: 1020-1120°C (water, air) fast cooling
It is formable at 900-1200°C
Excellent - Acidur 4401 shows good weldability with or without welding filler. If a filler metal is necessary, use 1.4430. The maximum interlayer temperature is 150°C. Due to the high carbon content, chromium carbides can form which reduces the resistance to intergranular corrosion. A heat treatment after welding is required. If this cannot be guaranteed, it is recommended to use the lower carbon variant Acidur 4404, the corrosion resistance is influenced by the heat input during welding.