A welded steel part obtained by welding a first sheet with a second sheet, at least one with a coating of aluminum alloy. The welding uses a welding wire which, after melting and cooling, constitutes a weld bead connecting the first sheet to the second sheet and being part of said welded steel part. The respective peripheral edge of the first and second sheets are in a joggled edge type configuration in which the peripheral edge of the first sheet is arranged above, and on or near the upper face of an end portion of the peripheral edge of the second sheet which is extended by an inclined junction portion, at least one part of the upper face of the inclined junction portion delimits at least laterally with the edge of the peripheral edge of the first sheet a groove receiving the weld bead, the inclined joining portion extending by a welding portion in longitudinal continuity with the peripheral edge of the first sheet.

A coated tool for hot stamping of coated or uncoated sheet metals, comprising a coated substrate surface to be in contact with the coated or uncoated metal sheet, wherein the coating in the coated substrate surface comprises one or more inferior layers and one or more superior layers, where the inferior layers are deposited closer to the substrate surface than the superior layers, and: the inferior layers are designed for providing load bearing capacity, the superior layers are designed for providing galling resistance, at least one superior layer is deposited having a multi-nanolayer structure wherein: one type of nanolayer is composed of at least 90 at.-% of chromium and nitrogen, a second type of nanolayer is composed of at least 90 at.-% of titanium, aluminum and nitrogen, a third type of nanolayer is composed of at least 90 at.-% of vanadium carbon and nitrogen.

A process for manufacturing a metal part (10), is described said part extending in a first direction (Y) and having a section comprising a central member (14) and at least a first side member (16) extending in a second direction. The process comprises the following steps: supply of a metal blank (30); removing material from the blank so as to form an intermediate part (32) comprising the central member (14), a junction zone (12) and at least first (116) and second (118) intermediate side members, with a space (34) between the first and second intermediate side members; and hot forming (104) the intermediate part, including spreading the first and second intermediate side members apart by inserting a first punch (212) between said members.

A steel sheet for the manufacture of a press hardened part is provided, having a composition of: 0.15%≤C≤0.22%, 3.5%≤Mn<4.2%, 0.001%≤Si≤1.5%, 0.020%≤Al≤0.9%, 0.001%≤Cr≤1%, 0.001%≤Mo≤0.3%, 0.001%≤Ti≤0.040%, 0.0003%≤B≤0.004%, 0.001%≤Nb≤0.060%, 0.001%≤N≤0.009%, 0.0005%≤S≤0.003%, 0.001%≤P≤0.020%. A microstructure has less than 50% ferrite, 1% to 20% retained austenite, cementite, such that the surface density of cementite particles larger than 60 nm is lower than 10{circumflex over ( )}7/mm.sup.2, and a complement of bainite and/or martensite, the retained austenite having an average Mn content of at least 1.1*Mn %. Press-hardened steel part obtained by hot forming the steel sheet, and manufacturing methods thereof.

A hot-press formed product can be achieved which has regions corresponding to a shock resistant portion and an energy absorption portion within a single formed product without applying a welding method and achieves the balance of high strength and elongation with a high level according to each region by means of having a first forming region exhibiting a metal structure containing martensite: 80-97 area % and retained austenite: 3-20 area % respectively, the remaining structure being 5 area % or less, and a second forming region exhibiting a metal structure containing annealed martensite or annealed bainite: 30-97 area %, martensite as quenched: 0-67 area %, and retained austenite: 3-20 area %.

A hot press-forming method includes a forming step that clamps a steel sheet heated to a temperature not less than an austenite transformation temperature and press-forms the steel sheet into a desired shape by causing a forming concave of a die and a convex of a punch to be close to each other. A formed portion has side and top portions that merge. The side portion rises up from an inner circumferential edge of a flange portion having been clamped by the die and the blank holder. A cooling step cools a region of the steel sheet after the heating step has been completed and before the forming step is completed. The particular region is along an inter-edge area formed between an opening circumferential edge of the forming concave and a top circumferential edge of the forming convex before the forming step is completed.

A hot-press deep-drawing forming apparatus includes a punch that constitutes a lower die and a die that constitutes an upper die. The punch has an inner-face forming surface that forms the inner face of a product, and a bent corner against which a scrap section S of a workpiece W abuts. The die has an outer-face forming surface that forms the outer surface of the product. A blank holder and a pre-forming die that clamp the scrap section are caused to move, together with the die, until the clamped scrap section abuts the bent corner. The movement of the blank holder and the pre-forming die is stopped after the scrap section has abutted the bent corner.

A method may be used to produce a component that includes at least two different materials. The method may involve providing a hardenable planar or preformed steel sheet or steel profile, completely or partially heating the steel sheet or steel profile to the austenitic temperature, inserting the heated steel sheet or steel profile into a first tool for hot forming and/or press hardening the steel sheet or steel profile to give a completely or partially hardened steel workpiece. In the course of the hot forming and/or press hardening at least one jog is made in the steel sheet or the steel profile. The jog may serve for fastening at least one second material thereto.”

A hot-stamped and trimmed part is produced by hot pressing a blank and then cutting off an excess outer peripheral portion by laser machining, an outer peripheral shape of the hot-stamped and trimmed part includes a laser trim line formed by cutting in the laser machining, and a press trim line formed by shearing in the hot pressing or pressing performed before the hot pressing, and the laser trim line and the press trim line are connected via a projecting corner portion.

This manufacturing method of a hot press-formed article includes a heating step of heating an Al-plated steel sheet and a forming step of obtaining a hot press-formed article using a die after the heating step, the Al-plated steel sheet has a base steel sheet, an Al plating layer, and a coating layer, the coating layer is a metal layer containing at least one metal of Mg, Ca, V, Ti, and Zn, a metal oxide layer containing an oxide of one or more of Mg, Ca, V, Ti, and Zn, or a mixed layer including the metal layer and the metal oxide layer, the die has a hard layer on a surface, HV.sub.Die that is a surface hardness of the die at a position of the hard layer is HV1500 or more and HV3800 or less, and a temperature Tm of the Al-plated steel sheet at a start of forming and an average movement velocity V of the die in the forming step satisfy 800−(HV.sub.Die/40)≤Tm≤850−(V/4)−(HV.sub.Die/100).