Corrosion resistant hot and cold forming parts of Ni-Cr-Mo alloy and method of making same

US4906437A · kind A · utility

Assignee

• VDM Nickel-Technologie AG · DE

Inventors

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

Key dates

• Filing date: Feb 21, 1989
• Grant date: Mar 6, 1990
• Expiry date: Feb 21, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C19/055
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

For use in making components which are required to have a very high resistance to uniform corrosion and against pitting and crevice corrosion under very highly corrosive conditions encountered in up to date chemical process technology and environmental protection technology, for instance, in flue gas desulfurizing plants for concentrating sulfuric acid, and which are required to be manufactured satisfactorily by conventional hot and cold forming processes an alloy is employed which contains (in % by weight) 22.0 to 24.0 chromium, 15.0 to 16.5 molybdenum, up to 0.3% tungsten, up to 1.5% iron, up to 0.4% vanadium, 0.1 to 0.4% aluminum, 0.001 to 0.04% magnesium and 0.001 to 0.01 calcium, balance nickel and inevitable accompanying elements and impurities.