Stainless and acid-resistant steel

The protection properties of stainless and acid-resistant steels are achieved by the formation of a chromium oxide film. An effective corrosion resistance is achieved from a chromium content of approx. 12%. As a general rule: the higher the chromium content, the better the corrosion resistance. Corrosion resistance can be further improved by including the alloying elements nickel (Ni) and molybdenum (Mo).

In many applications the carbon content is reduced to achieve even greater corrosion resistance. By reducing the carbon content, the formation of chromium carbide will be largely avoided. The problem here is that the grain boundaries in particular are prone to chromium depletion, and this lowers the corrosion resistance. The addition of titanium (Ti) and/or niobium (Nb) may also suppress chromium carbide formation, as both these elements react with the carbon prior to chromium. Avoiding chromium carbide formation has a positive effect on the corrosion resistance of stainless and acid-resistant steel during welding.


DIN-No. Designation
1.4027 GX20Cr14
1.4059 GX22CrNi17
1.4122 GX35CrMo17
1.4308 GX5CrNi19-10
1.4317 GX4CrNi13-4
1.4404 X2CrNiMo17-12-2
1.4408 GX5CrNiMo19-11-2
1.4410 X2CrNiMoN25-7-4
1.4435 X2CrNiMo18-14-3
1.4468 GX2CrNiMoN25-6-3
1.4535 X90CrCoMoV17
1.4552 GX5CrNiNb19-11
1.4581 GX5CrNiMoNb19-11-2
The above is merely a selection of typical investment casting materials, further options on request.