Method for intercooling sheet steel
Assigneevoestalpine Stahl GmbH
InventorsChristoph Wagner, Siegfried Kolnberger
Life of this patent
Estimating the term…
Abstract
A method for producing a hardened sheet steel, in particular a sheet steel that is coated with a metallic anti-corrosion layer; the sheet steel is first heated to an austenitization temperature and the austenite transformation is completed and then the sheet steel is pre-cooled to a temperature that lies above the transformation temperature of the austenite to other phases and is then transferred to a press-hardening die and in the press-hardening die, is shaped and, for hardening purposes, is quenched; for pre-cooling purposes, the blank is blasted in at least some areas or zones with dry ice, dry snow, or a gas flow containing dry ice particles.
Claims9
A method for producing a hardened sheet steel that is coated with a metallic anti-corrosion layer, comprising:
- first heating the sheet steel that is coated with a zinc-based anti-corrosion layer containing oxygen-affinity elements to an austenitization temperature and completing austenite transformation, wherein the austenitization causes a superficial skin composed of an oxide or oxides of higher-oxygen-affinity elements to form on the anti-corrosion layer;
- pre-cooling the sheet steel to a temperature that lies above a transformation temperature of the austenite to other phases and simultaneously cleaning a surface of the sheet steel of oxides of the higher-oxygen-affinity elements, by blasting the sheet steel in at least some areas or zones with dry ice, dry snow, or a gas flow containing dry ice particles;
- and
- then transferring the sheet steel to a press-hardening die and shaping and, for hardening purposes, quenching the sheet steel in the press-hardening die.
Dependencies are inferred from the claim text.