Patent · US Expired

Continuous heat treatment for metal sheet

US4349393A · kind A · utility

1Cited by

1References

11Claims

0Family size

Assignee

Centre De Recherches Metallurgiques-Centrum Voor Research in De Metallurgie · BE

Inventors

Philippe Paulus · Liège, BE
Marios Economopoulos · Liège, BE

Key dates

Filing date	Sep 16, 1980
Grant date	Sep 14, 1982
Priority date	—
Expiry date	Sep 16, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC21D9/52
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Metal sheet (cold-rolled steel sheet) contaminated with rolling oil is heated at a temperature higher than its recrystallization temperature in a naked flame furnace, e.g. of the incomplete combustion type. The heated sheet is then rapidly cooled by contact with an aqueous medium. The resulting sheet has considerably improved suitability for phosphate coating and painting, compared with sheet which is annealed after alkaline degreasing. The sheet is preferably treated with formic acid.

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