A flat steel product for hot forming to a formed shaped sheet metal part and processes of making same. The flat steel product and the shaped sheet metal part have improved properties, especially in conjunction with an aluminum-based anticorrosion coating.

A system for producing components by hot forming includes a conductive post-furnace heat station, a furnace, a computer system, and a press. The computer system comprises one or more physical processors operatively connected with the furnace in and the conductive post-furnace heat station. The one or more physical processors being programmed with computer program instructions which, when executed cause the computer system to control the furnace to heat the blank to a temperature that is below AC3 temperature; and control the conductive post-furnace heat station to heat a portion of the heated blank to a temperature above the AC3 temperature by thermal conduction. The press is constructed and arranged to receive the post-heated blank from the post-furnace heat station and to form the post-heated blank into the shape of the component.

A flat steel product for hot forming, a formed shaped sheet metal part and methods of production of the same. The flat steel product and the shaped sheet metal part have improved properties, especially in conjunction with an aluminum-based anticorrosion coating.

The present invention provides a deformed part created by forming a coated metal sheet into a part, the coated metal sheet comprising a steel substrate, at least one face of which is coated with a metal coating deposited by dipping the substrate in a bath, said coating comprising between 0.2 and 0.7% by weight of Al, the remainder of the metal coating being Zn and inevitable impurities, wherein an outer surface of a metal coating of the deformed part has a waviness Wa0.8 of less than or equal to 0.43 m.

The present invention provides a method for manufacturing a metal sheet. In this method, at least one of the following equations is satisfied:

[00001]$\begin{array}{cc}\frac{Z}{d}+18.Math..Math.\ln \left(\frac{Z}{d}\right)<8.Math..Math.\ln \left(\frac{P}{V}\right)-27.52& \left(A\right)\\ f.Math..Math.O_2<\frac{2.304.Math.{\mathrm{.10}}^{-3}}{{\left(27.52+\frac{Z}{d}+8.Math..Math.\ln \left(\frac{V}{P}.Math.{\left(\frac{Z}{d}\right)}^{2.25}\right)\right)}^2}& \left(B\right)\end{array}$

wherein: Z is the distance between the metal sheet and the nozzle along the main ejection direction (E), Z being expressed in mm, d is the average height of the outlet of the nozzle along with the running direction of the metal sheet in front of the nozzle, d being expressed in mm, V is the running speed of the metal sheet in front of the nozzle, V being expressed in m.Math.s.sup.1, P is the pressure of the wiping gas in the nozzle, P being expressed in N.Math.m.sup.2, and fO.sub.2 is the volume fraction of oxygen in the wiping gas. A metal sheet, part and land motor vehicle are also provided.

A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 m or less. An inverse intensity ratio of -fiber to -fiber in the ferrite is 1.00 or more and an inverse intensity ratio of -fiber to -fiber in the martensite and the tempered martensite is 1.00 or more.

A method for producing components by hot forming comprises (a) heating a first portion and a second portion of a blank in a furnace to a temperature that is below AC3 temperature to provide a heated blank; (b) transferring the heated blank from the furnace to a conductive post-furnace heat station; (c) heating the first portion of the heated blank in the conductive post-furnace heat station to a temperature above the AC3 temperature by thermal conduction to provide a post-heated blank, while the second portion of the heated blank is sufficiently spaced from of the conductive post-furnace heat station so that the second portion of the heated blank is not heated in the conductive post-furnace heat station to the AC3 temperature; (d) transferring the post-heated blank from the conductive post-furnace heat station to a press; and (e) forming the post-heated blank into the shape of the component in the press.

A process for producing a steel component with a metallic, corrosion protection coating and very good mechanical properties may involve directly applying an iron-based alloy to a steel substrate. The iron-based alloy may contain 50-80% by weight of Fe, 0-30% by weight of Mg, 0-5% by weight of Al, 0-5% by weight of Ti, 0-10% by weight of Si, 0-10% by weight of Li, 0-10% by weight of Ca, 0-30% by weight of Mn, and a balance of Zn and unavoidable impurities. The steel substrate that has been coated with the iron-based alloy may then be subjected to hot forming in order to obtain the steel component. A metallic coating that protects against corrosion for steel components to be produced by the process of hot forming can be obtained.

A steel part includes a steel sheet substrate and a coating on at least one surface of the steel sheet substrate. The coating includes between 0.2 and 0.7% by weight of Al, with a remainder of the metal coating being Zn and inevitable impurities. The steel sheet substrate and the coating have at least one deformation. An outer surface of the coating has a waviness Wa.sub.0.8 of less than or equal to 0.43 m.

A coated steel sheet providing cathodic protection and suitable for manufacturing a press hardened part with good powdering resistance during press-hardening and good corrosion performance. A method for the manufacture of hardened parts starting from a steel sheet coated with a metallic coating. The part has good characteristics with respect to corrosion and powdering resistance. The present disclosure is particularly well suited for the manufacture of automotive vehicles.