Patent · US Expired

Structural part made of ferritic chromium-molybdenum steel which is resistant to concentrated sulfuric acid

US5030415A · kind A · utility

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2Claims

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Assignee

Metallgesellchaft Aktiengesellschaft · DE

Inventors

Karl-Heinz Dorr
Hermann Muller · Goldschlagstraße, DE
Ulrich Sander · Rebstein, CH
Wolfram Schalk · Bad Homburg vor der Höhe, DE
Ernst Wallis · Eschborn, DE

Key dates

Filing date	Aug 24, 1989
Grant date	Jul 9, 1991
Priority date	—
Expiry date	Aug 24, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC22C38/48
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Ferritic chromium-molybdenum steels containing PA1 26 to 30% chromium PA1 1.8 to 3.0% molybdenum PA1 3.0 to 4.5% nickel PA1 carbon.ltoreq.0.02% PA1 silicon.ltoreq.1.00% PA1 manganese.ltoreq.1.00% PA1 sulfur.ltoreq.0.015% PA1 carbon+nitrogen.ltoreq.0.045% PA1 niobium.gtoreq.12.times.%C.ltoreq.1.2% PA1 balance iron and impurities which are due to the melting technology are used as corrosion-resisting material to make structural parts which are resistant to sulfuric acid in a concentration of and above 94% by weight and at a temperature up to the boiling point of the sulfuric acid.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.