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04233 Alloy Selection for Dilute and Medium Concentration Sulfuric Acid

Sulfuric acid is one of the most important elementary substances of the chemical industry.  There is no stainless steel or even a nickel base alloy available which is suitable over the entire concentration range.  This paper will give corrosion data in up to 75 % sulfuric acid at boiling temperature for various commercial grades as well as for some new developmental alloys.

Product Number: 51300-04233-SG
ISBN: 04233 2004 CP
Author: Ulrich Brill and Helena Alves, ThyssenKrupp VDM GmbH
Publication Date: 2004
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Sulfuric acid is one of the most important elementary substances of the chemical industry. The acid has found a wide variety of applications in industry today, e.g. fertilizer, chemicals, pigments & paints, petroleum, textiles & films, iron and steel etc.. Because of the changing character of the acid over the concentration, i.e. for concentrations higher than about 85 % the acid becomes oxidizing, there is no stainless steel or even a nickel base alloy available which is suitable over the entire concentration range up to boiling temperature. Alloys like 825 and alloy 20 can be used today only for temperatures up to 50 °C.

This paper will give corrosion data in up to 75 % sulfuric acid at boiling temperature for various commercial grades as well as for some new developmental alloys. The influence of copper and silicon additions on the corrosion resistance is described. On the basis of the beneficial influence of some element additions a new alloy modification for service in diluted and medium concentrated sulfuric acid up to boiling temperature was tested. 

Keywords: sulfuric acid, boiling temperature, influence of element additions

Sulfuric acid is one of the most important elementary substances of the chemical industry. The acid has found a wide variety of applications in industry today, e.g. fertilizer, chemicals, pigments & paints, petroleum, textiles & films, iron and steel etc.. Because of the changing character of the acid over the concentration, i.e. for concentrations higher than about 85 % the acid becomes oxidizing, there is no stainless steel or even a nickel base alloy available which is suitable over the entire concentration range up to boiling temperature. Alloys like 825 and alloy 20 can be used today only for temperatures up to 50 °C.

This paper will give corrosion data in up to 75 % sulfuric acid at boiling temperature for various commercial grades as well as for some new developmental alloys. The influence of copper and silicon additions on the corrosion resistance is described. On the basis of the beneficial influence of some element additions a new alloy modification for service in diluted and medium concentrated sulfuric acid up to boiling temperature was tested. 

Keywords: sulfuric acid, boiling temperature, influence of element additions

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