Patent · US Expired

Rolled steel rod or bar

US4016015A · kind A · utility

12Cited by

3References

5Claims

0Family size

Assignee

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

Inventors

Yves J. Respen · Herstal, BE
Paul Cosse · Bellaire, BE
Mario Economopoulos · Liège, BE

Key dates

Filing date	Sep 26, 1975
Grant date	Apr 5, 1977
Priority date	—
Expiry date	Sep 26, 1995

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S148/902
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Steel rod or bar at the exit of the finishing stand of a hot rolling mill is superficially quenched, so that the surface layer of the rod or bar is given a bainitic or martensitic structure. Immediately after quenching, the core of the rod or bar is at about 850.degree. C and, therefore, still austenitic. Subsequent air cooling allows the austenite to transform to ferrite and carbides, while the surface layer is tempered by the heat transferred to it from the core.

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