A method to produce press hardened parts at high productivity
OwnerLaurent CRETTEUR, Antoine JOUMELinventors
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Abstract
A press hardening method including the following steps: A) providing a coated steel sheet, the total thickness of a polymerized coating layer on the coated steel sheet being from 3.0 to 10.0 μm, B) trimming or cutting the coated steel sheet 5 into a blank, C) heating the blank at a temperature from 850 to 950° C. and during 2.00 to 3.40 minutes if the steel sheet is thicker than 0.6 mm and thinner or equal to 1.5 mm, and during 2.50 to 4.00 minutes if the steel sheet is thicker than 1.5 mm and thinner than 3.0 mm, D) transferring the hot blank into a press tool, E) forming and press hardening of the part.
Claims19
1-17. (canceled)
A press hardening method comprising the following steps:
- A) providing a coated steel sheet, made of a metallic coated steel sheet, the metallic coated steel sheet having a steel sheet for heat treatment, coated with a metallic coating, wherein the metallic coated steel sheet is overlaid, over at least a portion of the metallic coating, by a polymerized coating layer on a first side of the metallic coated steel sheet, a total thickness of the polymerized coating layer on the coated steel sheet being from 3.0 to 10.0 μm composed of a polymer not containing silicon and having a nitrogen content of less than 1 weight % expressed in relation to the polymerized coating layer, the polymerized coating layer containing carbon pigments in a quantity from 3 to 30 weight %, expressed in relation to the polymerized coating layer;
- B) trimming or cutting the coated steel sheet into a blank;
- C) heating the blank in a furnace at a temperature set from 850 to 950° C. and for 2.00 to 3.40 minutes when a thickest portion of the blank is thicker than 0.6 mm and thinner or equal to 1.5 mm, and for 2.50 to 4.50 minutes when the thickest portion of said blank is thicker than 1.5 mm and thinner than 3.0 mm;
- D) transferring the heated blank into a press tool;
- and
- E) forming the heated blank into a part and press hardening the part into a press-hardened part.
Dependencies are inferred from the claim text.