Method for making steel tubes or pipes of increased acidic gas resistance

US4721536A · kind A · utility

Assignee

• Hoescht Aktiengesellschaft · DE

Inventors

• Heinz Grob · Dortmund, DE
• Friedrich-Otto Koch · Finsterwalde, DE
• Adolf Peeck · Stadthagen, DE
• Werner Wennemann · Dortmund, DE

Key dates

• Filing date: Jun 10, 1986
• Grant date: Jan 26, 1988
• Expiry date: Jun 10, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D9/50
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

For increasing the resistance of steel pipes or tubes against acidic medium, by a combination of a heat treatment and the use of an alloyed steel, a compressure stress is built up on the side of the tubes or pipes facing the acidic medium, of up to 30% of the yield limit.