HOT-ROLLED AND COATED STEEL SHEET FOR HOT-STAMPING, HOT-STAMPED COATED STEEL PART AND METHODS FOR MANUFACTURING THE SAME

A method for manufacturing a hot-rolled and coated steel sheet having a thickness between 1.8 mm and 5 mm, comprising providing a semi-product having a composition comprising: 0.04% C 0.38%, 0.40% Mn 3%, 0.005% Si 0.70%, 0.005% Al 0.1%, 0.001% Cr 2%, 0.001% Ni 2%, 0.001% Ti 0.2%, Nb 0.1%, B 0.010%,...

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Bibliographische Detailangaben
Hauptverfasser:	HENRION, THOMAS, BEAUVAIS, MARTIN, JACOLOT, RONAN
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE PERFORMING OPERATIONS PUNCHING METAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A method for manufacturing a hot-rolled and coated steel sheet having a thickness between 1.8 mm and 5 mm, comprising providing a semi-product having a composition comprising: 0.04% C 0.38%, 0.40% Mn 3%, 0.005% Si 0.70%, 0.005% Al 0.1%, 0.001% Cr 2%, 0.001% Ni 2%, 0.001% Ti 0.2%, Nb 0.1%, B 0.010%, 0.0005% N 0.010%, 0.0001% S 0.05%, 0.0001% P 0.1%, Mo 0.65 %, W 0.30%, Ca 0.006%, hot-rolling with a final rolling temperature FRT, to obtain a hot-rolled steel product having a thickness between 1.8 mm and 5 mm, then cooling down to a coiling temperature Tc0ii satisfying: 450 C Tcoil Tcoilmax with Tcoilmax=650-140xfy , Tcoilmax being expressed in degrees Celsius and fy designating the austenite fraction just before the coiling, and coiling to obtain a hot-rolled steel substrate, pickling and coating the hot-rolled steel substrate with Al or an Al alloy by continuous hot-dipping in a bath, to obtain a hot-rolled and coated steel sheet comprising a hot-rolled steel sheet and an Al or an Al alloy coating, having a thickness comprised between 10 and 33 pm, on each side of the hot-rolled steel sheet. Procédé de fabrication dune tôle dacier laminée à chaud et revêtue ayant une épaisseur comprise entre 1,8 mm et 5,0 mm comprenant la fourniture dun semi-produit ayant une composition comprenant : 0,0400 % C 0,3800 %, 0,4000 % Mn 3,0000 %, 0,0050 % Si 0,7000 %, 0,0050 % Al 0,1000 %, 0,0010 % Cr 2,0000 %, 0,0010 % Ni 2,0000 %, 0,0010 % Ti 0,2000 %, Nb 0,1000 %, B 0,0100 %, 0,0005 % N 0,0100 %, 0,0001 % S 0,0500 %, 0,0001 % P 0,1000 %, Mo 0,6500 %, W 0,3000 %, Ca 0,0060 %, laminage à chaud avec une température finale de laminage FRT pour obtenir un produit en acier laminé à chaud ayant une épaisseur comprise entre 1,8 mm et 5,0 mm, puis refroidissement jusquà une température de bobinage Tc0ii satisfaisant 450 ºC Tcoil Tcoilmax avec Tcoilmax=650-140xfy, Tcoilmax étant exprimé en degrés Celsius et fy désignant la fraction austénitique juste avant le bobinage, et bobinage pour obtenir un substrat en acier laminé à chaud, décapage et revêtement du substrat en acier laminé à chaud avec Al ou un alliage dAl par trempage à chaud en continu dans un bain pour obtenir une tôle dacier laminée à chaud et revêtue comprenant une tôle dacier laminée à chaud et un revêtement dAl ou dalliage dAl ayant une épaisseur comprise entre 10 et 33 pm, de chaque côté de la tôle dacier laminée à chaud.