Provided are a plated steel sheet for hot press forming including: a base steel sheet containing, by wt%, 0.14 to 0.5% of C, 0.001 to 1% of Si, 0.3 to 4% of Mn, 0.001 to 0.015% of P, 0.0001 to 0.02% of S, 0.001 to 0.1% of Al, 0.001 to 1% of Cr, 0.001 to 0.02% of N, 0.1% or less of Ti, 0.01% or less of B, 0.005 to 0.1% of Sb, and a balance of Fe and unavoidable impurities; an aluminum or aluminum alloy plating layer provided on at least one surface of the base steel sheet; and a Sb-rich layer provided between the base steel sheet and the plating layer, wherein the plated steel sheet for hot press forming satisfies the following Relational Expressions 1-1 and 1-2, a hot press formed member manufactured using the same, and methods for manufacturing the plated steel sheet for hot press forming and the hot press formed member.

[00001]$\begin{array}{cc}\frac{S{b}_{\max }}{S{b}_{coat}}\ge 1.2& \text{­­­[Relational Expression 1-1]}\end{array}$

[00002]$\begin{array}{cc}\frac{\left(S{b}_{\max }-S{b}_{coat}\right)}{2}\times \text{Δ}t\ge 0.008& \text{­­­[Relational Expression 1-2]}\end{array}$

[In Relational Expressions 1-1 and 1-2, Sb.sub.coat represents an average content of Sb in the plating layer, and a unit thereof is wt%, Sb.sub.max represents a maximum value of a content of Sb in the Sb-rich layer, and a unit thereof is wt%, and Δt represents a linear distance from a boundary between the plating layer and the Sb-rich layer to a point where Sb.sub.max is measured, and a unit thereof is .Math.m.]

A method for producing a sheet metal product (1) from a sheet metal preliminary product (2) is proposed, wherein at least one surface (7) of the sheet metal preliminary product (2) is coated with a coating, wherein the sheet metal preliminary product (2) is rolled, wherein depressions (6) are rolled into the surface (7) during the rolling operation, wherein after the coating and rolling operations lubricant (8.1) is introduced into the depressions (6), wherein after the introduction of lubricant (8.1) the sheet metal preliminary product (2) is mechanically formed by a forming tool (5), characterized in that the surface (7) is coated in such a way that, in the forming tool (5) during the forming process, in particular under relative movement between sheet metal surface and tool surface, the coating is elastically deformable under loads of 0.5 MPa to 20 MPa and plastically deformable under loads of above 20 MPa.

An aluminum-based coating of a flat steel product is applied in a hot-dipping method and comprises a mass percentage of silicon within a given range. The coating for a flat steel product, in particular for press mold hardening components, offers a shortened required minimum oven dwell time and a sufficiently large processing window when heating in an oven. This is achieved in that the surface of the coating has a degree of absorption for thermal radiation ranging between 0.35 and 0.95 prior to an annealing treatment, where the degree of absorption relates to an oven temperature ranging from 880 to 950° C. during the austenitizing annealing treatment. The invention additionally relates to an improved method for producing a flat steel product with an aluminum-based coating, to an inexpensive method for producing press-hardened components from such flat steel products, and to a press-hardened component made of such flat steel products.

A press hardened steel part is provided. The steel of the part has a chemical composition including, in weight: 0.062%≤C≤0.095%, 1.4%≤Mn≤1.9%, 0.2%≤Si≤0.5%, 0.020%≤Al≤0.070%, 0.02%≤Cr≤0.1%, wherein: 1.5%≤(C+Mn+Si+Cr)≤2.7%, 0.040%≤Nb≤0.060%, 3.4×N≤Ti≤8×N wherein: 0.044%≤(Nb+Ti)≤0.090%, 0.0005≤B≤0.004%, 0.001%≤N≤0.009%, 0.0005%≤S≤0.003%, 0.001%≤P≤0.020%, optionally: 0.0001%≤Ca≤0.003%, and the remainder being Fe and unavoidable impurities. The microstructure of the part includes, in a majority of the part, in surface fractions: less than 40% of bainite, less than 5% of austenite, less than 5% of ferrite, and a remainder being martensite. The martensite is fresh martensite and self-tempered martensite.

A high-strength galvanized steel sheet and a method for producing the steel sheet. The steel sheet has a composition that includes C: 0.030% to 0.250%, Si: 0.01% to 3.00%, Mn: 2.00% to 10.00%, P: 0.001% to 0.100%, S: 0.0001% to 0.0200%, N: 0.0005% to 0.0100%, Ti: 0.005% to 0.200%, on a mass basis, and Fe and inevitable impurities. Additionally, the steel sheet has concentration of solute Mn at a depth of 5 μm or less from a surface of the steel sheet that is 1.50% by mass or less, and a value obtained by dividing the average mass percentage of Mn in retained austenite by the average mass percentage of Mn in ferrite is 2.0 or more.

A flat steel product is provided, including a steel substrate made of a steel which consists of, in % by weight, 0.07-0.4% C, 1.0-2.5% Mn, 0.06-0.9% Si, ≤0.03% P, ≤0.01% S, ≤0.1% Al, ≤0.15% Ti, ≤0.6% Nb, ≤0.005% B, ≤0.5% Cr, 50.5% Mo, where the sum of Cr and Mo is ≤0.5%, and, as the remainder, Fe and unavoidable impurities, and including an anti-corrosion coating which is formed from, in % by weight, ≤15% Si, ≤5% Fe, ≤5% of at least one alkaline earth or transition metal and, as the remainder, Al and unavoidable impurities. If the anti-corrosion coating contains ≤0.1% by weight of the alkaline earth or transition metal, a solution containing at least one alkaline earth or transition metal is applied to the anti-corrosion coating of the flat steel product. Then, the flat steel product is flexibly cold-rolled to produce the portions of different thicknesses. Then, it is heated to 800-1000° C. in an atmosphere with >15% by volume O.sub.2 until an amount of thermal energy Js of >44,000 kJs and ≤400,000 kJs has been introduced.

A highly corrosion-resistant austenite stainless steel that, even when exposed to temperatures in a range in which a σ phase is precipitated and corrosion resistance varies greatly, the stainless steel remains corrosion resistant, the steel consisting of, in mass %: C: 0.005 to 0.030%, Si: 0.05 to 0.30%, Mn: 0.05 to 0.40%, P: 0.005 to 0.050%, S: 0.0001 to 0.0010%, Ni: 22.0 to 32.0%, Cr: 19.0 to 28.0%, Mo: 5.0 to 7.0%, N: 0.18 to 0.25%, Al: 0.005 to 0.100%, Cu: 0.05 to 0.50%, W: not more than 0.05%, Sn: 0.0005 to 0.0150%, Co: 0.030 to 0.300%, B: 0.0005 to 0.0050%, Fe as a remainder and inevitable impurities, in which the stainless steel satisfies the following formula (1), an area ratio of σ phase is not more than 1%, and CPT based on ASTM G48 Method C as corrosion resistance property is not less than 60° C.

0.05≤10[% B]+2[% P]+6[% Sn]+0.03[% Si]≤0.20  (1)

A sheet metal component made of a hot-formed flat steel product including a steel substrate consisting of, in mass. %, C: 0.1-0.4%, Mn: 0.5-3.0%, Si: 0.05-0.5% Cr: 0.005-1.0%, B: 0.0005-0.01% and optionally one or more of V, Ti, Nb, Al, Ni, Cu, Mo, and W, where the contents of the respective optionally present alloy element are V: 0.001-0.2%, Ti: 0.001-0.1%, Nb: 0.001-0.1%, Al: 0.01-0.2%, Ni: 0.01-0.4%, Co: 0.01-0.8% Mo: 0.001-1.0%, W: 0.001-1.0%, and the remainder iron and unavoidable impurities, wherein the unavoidable impurities include contents less than 0.1% P, less than 0.05% S, and less than 0.01% N, and an Al corrosion protection layer applied to the steel substrate, wherein the component is optionally hardened. An adhesive section having an SDR value of 3-30%, determined according to ISO 25178 is provided on the free outer face of the corrosion protection coating for adhering the sheet metal component to another component.

Provided are a steel sheet dehydrogenation apparatus, a steel sheet production system, and a steel sheet production method capable of producing a steel sheet excellent in hydrogen embrittlement resistance without changing the mechanical properties of the steel sheet. A dehydrogenation apparatus comprises: a housing configured to house a steel sheet coil obtained by coiling a steel strip; and a sound wave irradiator configured to irradiate the steel sheet coil housed in the housing with sound waves to obtain a product coil.

GPa-grade bainite steel having an ultra-high yield ratio, containing, in addition to Fe, the following chemical elements in mass percentages: 0.12-0.24% of C; 0.2-0.5% of Si; 1.3-2.0% of Mn; 0.001-0.004% of B; 0.01-0.05% of Al; and at least one of Cr, Nb, Ti, and Mo, wherein Cr≤0.4%, Nb≤0.06%, Ti≤0.1%, and Mo≤0.4%. Also disclosed are a manufacturing method and annealing process for the steel.