Patent · US Expired

Metallic semi-finished product, processes for its preparation and its use

US4798631A · kind A · utility

2Cited by

1References

13Claims

0Family size

Assignee

Thyssen Aktiengesellschaft vorm August Thyssen-Hutte · DE

Inventors

Hans-Joachim Fleischer · Velbert, DE
Klaus Lohscheidt · Krefeld, DE
Dieter Gorres · Haan, DE
Friedrich Behr

Key dates

Filing date	Feb 25, 1987
Grant date	Jan 17, 1989
Priority date	—
Expiry date	Feb 25, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC22C19/07
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The invention relates to a metallic semi-finished product based on iron and/or nickel and/or cobalt and containing 2 to 16% of aluminum, 12 to 30% of chromium and at least one highly reactive element X, in particular from the group consisting of the rare earth metals and/or their dispersed oxides. The characteristic feature of the invention is that metallic columnar crystals are formed at least in the surface region of the semi-finished product and columnar crystals consisting predominantly of aluminum oxide and/or chromium oxide grow out of the said metallic columnar crystals, the axes of the two types of columnar crystals being predominantly at right angles to the geometric surface of the semi-finished product.

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