Corrosion-resisting Fe-Ni-Cr alloy

US4876065A · kind A · utility

Assignee

• VDM Nickel-Technologie AG · DE

Inventors

• Manfred Rockel · Friedrichsdorf, DE
• Ernst Wallis · Eschborn, DE
• Michael Köhler · Uster, CH
• Ulrich Heubner · Werdohl, DE
• Rolf Kirchheiner · Iserlohn, DE

Key dates

• Filing date: May 19, 1988
• Grant date: Oct 24, 1989
• Expiry date: May 19, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/44
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed in an improvement in a known Ni-Cr-Fe alloy. The alloy of the invention contains 30 to 32% nickel; 26 to 28% chromium; 0.5 to 1.5% copper; 6 to 7% molybdenum; up to 2% manganese; up to 1.0% silicon; up to 0.2% aluminum; up to 0.03% carbon; 0.10 to 0.25% nitrogen; balance iron and usual impurities. The alloy of the invention has increased pitting corrosion potential and critical crevice corrosion and pitting corrosion temperatures whereas the resistance of the alloy to commercially pure phosphoric acid has not been decreased.