Patent · US Expired

Producing stainless steels in parallel operated vessels

US6238453A · kind A · utility

5Cited by

9References

10Claims

0Family size

Assignee

Mannesmann AG · DE

Inventors

Lutz Rose · Goldkronach, DE
Hartmut Vorwerk · Duisburg, DE
Horst Kappes · Duisburg, DE
Klaus Ulrich · Heiligenhaus, DE

Key dates

Filing date	Jul 31, 1998
Grant date	May 29, 2001
Priority date	—
Expiry date	Jul 31, 2018

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/20
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process for producing stainless steels, particularly special steels containing chromium and chromium-nickel, in a smelting arrangement having at least two vessels, for supplying a steel foundry. A charge having mostly iron-containing raw scrap materials and partially carbon-containing alloy carriers is melted in a first vessel. At a temperature of 1460.degree. C., the melt is decarburized by the injection of oxygen so as to reduce the carbon content to less than 0.3%. The melt is heated to a tapping temperature of between 1620.degree. C. to 1720.degree. C. and the carbon content is subsequently reduced to 0.1%. A second charge is melted in a second vessel simultaneously with the decarburizing of the first charge in the first vessel.

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