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 method for producing hardened steel components is provided. Sheet bars are cut out from an alloy-galvanized strip made of a hardenable steel alloy and the sheet bars are heated to a temperature that produces a structural change to austenite, preferably to a temperature above the respective Ac3 point. The austenitized sheet bars are then conveyed to a press hardening tool in which the sheet bars are hot formed in a single stroke or multiple strokes by means of an upper and lower tool, wherein the formed sheet bar is cooled against the tools at a speed above the critical cooling rate so that a martensitic hardening occurs.After the galvanization, which can be hot-dip galvanization of the steel strip and before the temperature increase for achieving the austenitization, tin is applied to the surface of the strip or sheet bar.

Methods of forming a high-strength metal alloy precursor by tailor-casting strips having a tailored thickness across a width of a strip material are provided. The tailor-cast strips have varying thickness throughout the width, which can then be further tailor rolled to a final required thickness profile/tailored thickness. Such tailor-casting method can be conducted by contacting a patterned surface of a casting roller or a casting block with a liquid high-strength metal alloy in a continuous casting process. The present disclosure provides methods of continuously casting a strip having varying thickness across the width allows for improved product in subsequent processing, like tailor rolling. Methods of making a high-strength metal alloy structural automotive component from a tailor-cast blank having a tailored thickness are also provided.

The present invention discloses a machining technology of a low-temperature high-strength-ductility high manganese steel, high manganese steel plate, and high manganese steel tube, and a high manganese steel comprises the following components in percentage by weight: Mn 30%-36%, C 0.02%-0.06%, S≦0.01%, P≦0.008% and the balance being Fe. Smelted steel ingots are subject to solution treatment and are rolled and homogenized to obtain a high manganese steel plate or are drawn to form a high manganese steel tube. The hot-rolled or cold-rolled steel plate after being hot-rolled has tremendous application value in the fields of low-temperature applications, such as the steel plate used for a low temperature pressure container.

A method of attaching a cladding element to a base element. A first inner side of the cladding element is positioned spaced apart from a second inner side of the base element to define a slot therebetween, and one or more heating elements are located in the slot. A non-oxidizing atmosphere is provided in the slot, and the heating element is energized, to heat at least portions of the cladding element and the base element to a hot working temperature. While at the hot working temperature, the first and second inner sides are engaged with each other, and one or both are moved relative to the other, for plastic deformation of the first and second inner sides, to subject the portions of the cladding element and the base element to shear stresses. The portions are allowed to cool, for recrystallization thereof.

A hot-shapable uncoated steel-plate workpiece is press hardened by first transporting the plate through a heating zone continuously or discontinuously and there heating the plate to an austenitizing temperature while blocking entry of oxygen into the heating zone. Then the heated plate is cooled in a cooling zone to a martensitizing temperature below the austenitizing temperature without contacting the heated plate with oxygen. Finally, immediately and without cooling of the cooled workpiece to a martensite start temperature, the cooled workpiece is deformed at least partially in a finishing press into a desired shape.

Provided is a method for manufacturing a steel member through hot press forming using a steel sheet that contains a comparatively large amount of Si. The steel sheet includes, in mass ratio, C: 0.15% to 0.35%, Si: 1.0% to 3.0%, Mn: 1.0% to 3.0%, Al: more than 0% up to 0.10%, Ti: ([N]×48/14)% to 0.10% (where [N] denotes the amount of N in the steel sheet), B: 5 ppm to 50 ppm, P: more than 0% to less than 0.015%, S: more than 0% up to 0.010%, and N: more than 0% up to 0.010%, the balance being iron and unavoidable impurities. The average oxygen concentration from an outermost surface of the steel sheet down to a depth of 10 μm in a sheet thickness direction is 0.70 mass % or higher.

Provided are a high-strength hot-rolled steel sheet and a method for manufacturing the steel sheet. The steel sheet includes C: 0.060% or more and 0.140% or less, Si: 1.00% or less, Mn: 1.30% or more and 2.50% or less, P: 0.030% or less, S: 0.0050% or less, Al: 0.070% or less, N: 0.010% or less, Ti: 0.060% or more and 0.140% or less, Cr: 0.10% or more and 0.50% or less, B: 0.0002% or more and 0.0020% or less, and the balance being Fe and inevitable impurities, in which the relationship 5.0≤18C+Mn+1.3Cr+1500B≤6.0 is obtained. The microstructure includes a bainite phase in an amount of more than 90% one, two, or all of a ferrite phase, a martensite phase, and a retained austenite phase in an amount of less than 10%.

Provided is a dehydrogenation method capable of efficiently reducing hydrogen content in steel for thick or complexly-shaped steel materials and steel products in general. In a dehydrogenation method for a steel material, in a series of steel material production process including: a process of supplying a steel raw material; a process of subjecting the steel raw material to hot working; a process of inspecting a steel material obtained from the steel raw material; and a process of shipping the steel material, at least one of the steel raw material and the steel material at any stage from the supply process to the shipment process is subjected to, at least once, a sound wave irradiation treatment so that a sound pressure level at a surface of the at least one of the steel raw material and the steel material will be 30 dB or more.

A process for manufacturing a flat steel product having a prealloyed corrosion-resistant coating, comprises providing a coated flat steel product comprising a steel substrate having, at least on one side of the steel substrate, and an aluminum-based corrosion-resistant coating. The coated flat steel product is heat-treated, comprising the following substeps: Heating the coated flat steel product in a furnace at a furnace temperature T of between 950° C. and 1150° C. with a furnace dwell time tv of between 40 seconds and 150 seconds, the furnace temperature being chosen such that the heating rate of the coated flat steel product in the temperature range from 500° C. to 700° C. is more than 10 K/s. The coated flat steel product is held at a temperature above Ac3 for a hold time of between 20 seconds and 60 seconds.