Abstract: A steel component having a steel substrate containing 0.3-3 wt.-% manganese, and an anti-corrosion coating applied to the steel substrate including a coating layer having at least 70 mass-% ?-Fe(Zn,Ni) mixed crystal, the remainder being intermetallic compounds of Zn, Ni and Fe, and which has at its free surface a Mn-containing layer in which the Mn is present in metallic or oxidic form.

Abstract: A method by which a flat steel product containing 2-35 wt. % of Mn can be provided with a coating of Zn which adheres well by annealing at an annealing temperature Ta of 600-1100° C. for an annealing time of 10-240 s under an annealing atmosphere which has a reducing effect on the FeO present on the flat steel product and an oxidizing effect on the Mn contained in the steel substrate thereby forming a layer of Mn mixed oxide which covers the flat steel product at least in sections and then cooling the flat steel product to a temperature for bath entry and conveying it through a bath of molten Zn saturated within iron at a temperature of 420-520° C., within a dip time of 0.1-10 s.

Abstract: A steel component having a steel substrate containing 0.3-3 wt.-% manganese, and an anti-corrosion coating applied to the steel substrate including a coating layer having at least 70 mass-% ?-Fe(Zn,Ni) mixed crystal, the remainder being intermetallic compounds of Zn, Ni and Fe, and which has at its free surface a Mn-containing layer in which the Mn is present in metallic or oxidic form.

Abstract: A method by which a steel component can be produced, which is provided with a metallic coating which adheres well and which provides protection against corrosion, from a flat steel product produced from a steel material containing 0.3-3 wt.-% manganese and having a yield point of 150-1100 MPa and a tensile strength of 300-1200 MPa coated with an anti-corrosion coating which comprises a coating of ZnNi alloy which is electrolytically deposited on the flat steel product, which coating is composed in a single phase of ?-ZnNi phase and which contains, as well as zinc and unavoidable impurities, 7-15 wt.-% nickel.

Abstract: A readily formable flat steel product has a ductile edge layer that is from 10 to 200 ?m thick and has a ductility greater than a ductility of an inner core layer of the flat steel product. The readily formable flat steel product is produced by annealing a flat steel product having a C content of from 0.1 to 0.4% by weight in a continuous furnace. The annealing is carried out under an annealing atmosphere that contains from 0.1 to 25% by vol. of H2 and H2O, with the balance being N2 and technically unavoidable impurities. A dew point is between ?20° C. and +60° C., and a ratio of H2O/H2 is a maximum of 0.957. In the course of the annealing, the flat steel product is heated to a holding temperature of from 600 to 1100° C. and for a holding time of from 10 to 360 seconds.

Abstract: A process for melt dip coating a strip of high-tensile steel with alloy constituents including zinc and/or aluminum includes the following steps. The strip is heated in a continuous furnace initially in a reductive atmosphere to a temperature of approximately 650° C., at which the alloy constituents diffuse to the surface in small amounts. The surface, consisting predominantly of pure iron, is converted into an iron oxide layer by a short heat treatment at a temperature of up to 750° C. in a reaction chamber which is integrated in a continuous furnace and has an oxidizing atmosphere. In a subsequent annealing treatment at a higher temperature in a reductive atmosphere, this iron oxide layer prevents the alloy constituents from diffusing to the surface. In the reductive atmosphere, the iron oxide layer is converted into a pure iron layer to which the zinc and/or aluminum are applied in the molten bath with optimum adhesion.

Abstract: A method for coating a flat steel product manufactured from a high strength steel with a metallic coating, wherein the flat steel product is initially subjected to a heat treatment, in order then, in the heated state, to be hot-dip galvanized with the metallic coating in a melting bath containing overall at least 85% zinc and/or aluminum. The heat treatment includes heating the steel product in a reducing atmosphere, followed by converting a surface of the flat product to an iron oxide layer by a heat treatment lasting 1 to 10 secs in an oxidizing atmosphere, followed by annealing in a reducing atmosphere over a period of time which is longer than the duration of the formation of the iron oxide layer such that the iron oxide layer is reduced at least on its surface to pure iron, followed by cooling the product to a melting bath temperature.

Abstract: A readily formable flat steel product has a ductile edge layer that is from 10 to 200 ?m thick and has a ductility greater than a ductility of an inner core layer of the flat steel product. The readily formable flat steel product is produced by annealing a flat steel product having a C content of from 0.1 to 0.4% by weight in a continuous furnace. The annealing is carried out under an annealing atmosphere that contains from 0.1 to 25% by vol. of H2 and H2O, with the balance being N2 and technically unavoidable impurities. A dew point is between ?20° C. and +60° C., and a ratio of H2O/H2 is a maximum of 0.957. In the course of the annealing, the flat steel product is heated to a holding temperature of from 600 to 1100° C. and for a holding time of from 10 to 360 seconds.

Abstract: A flat steel product, and a method for its production, which is formed from a steel substrate, such as strip or sheet steel, and a zinc-based corrosion protection coating, applied to at least one side of the steel substrate, which contains (in wt. %) Mg: 0.25 to 2.5%, Al: 0.2 to 3.0%, Fe: ?4.0%, and optionally in total up to 0.8% of one or more elements of the group Pb, Bi, Cd, Ti, B, Si, Cu, Ni, Co, Cr, Mn, Sn and rare earths, remainder zinc and unavoidable impurities are described. The corrosion protection coating has an Al content of maximum 0.5 wt. % in an intermediate layer extending between a surface layer directly adjacent to the surface of the flat steel product and a border layer adjacent to the steel substrate and with a thickness amounting to at least 20% of the total thickness of the corrosion protection coating.

Abstract: A method by which a steel component can be produced, which is provided with a metallic coating which adheres well and which provides protection against corrosion, from a flat steel product produced from a steel material containing 0.3-3 wt.-% manganese and having a yield point of 150-1100 MPa and a tensile strength of 300-1200 MPa coated with an anti-corrosion coating which comprises a coating of ZnNi alloy which is electrolytically deposited on the flat steel product, which coating is composed in a single phase of ?-ZnNi phase and which contains, as well as zinc and unavoidable impurities, 7-15 wt.-% nickel.

Abstract: A method by which a flat steel product containing 2-35 wt. % of Mn can be provided with a coating of Zn which adheres well by annealing at an annealing temperature Ta of 600-1100° C. for an annealing time of 10-240 s under an annealing atmosphere which has a reducing effect on the FeO present on the flat steel product and an oxidising effect on the Mn contained in the steel substrate thereby forming a layer of Mn mixed oxide which covers the flat steel product at least in sections and then cooling the flat steel product to a temperature for bath entry and conveying it through a bath of molten Zn saturated within iron at a temperature of 420-520° C., within a dip time of 0.1-10 s.

Abstract: A method for producing a steel component provided with a metallic coating which protects against corrosion, in which a steel flat product, produced from an alloyed heat-treated steel, is coated with an Al coating which contains ?85% wt. Al and optionally ?15% wt. Si, a Zn coating with ?90% wt. Zn, and a top layer, the main constituent of which is at least one metal salt of phosphoric acid or diphosphoric acid and which additionally can contain contents of up to 45% of an Al:Zn ratio as well as optionally metal oxides, metal hydroxides and/or sulphur compounds, the steel flat product is heat treated at ?750° C., and the steel component is hot-formed from the heated steel flat product. The hot-formed steel component is cooled at a cooling rate sufficient to form a tempered or martensitic structure.

Abstract: A steel flat product having a Zn—Mg—Al coating. The coating, which in addition to zinc and unavoidable impurities, comprises in wt. %: Mg: 4-8%, Al: 0.5-1.8% and optionally one or more of the following: Si: <2%, Pb: <0.1%, Ti: <0.2%, Ni: <1%, Cu: <1%, Co: <0.3%, Mn: <0.5%, Cr: <0.2%, Sr: <0.5%, Fe: <3%, B: <0.1%, Bi: <0.1%, Cd: <0.1%, REM<0.2%, and Sn<0.5%. The steel flat product according to the invention is not only outstandingly protected against corrosion, but also welds well and coats well with an organic layer applied subsequently. The invention also relates to a method for producing a steel flat product having a Zn—Mg—Al coating.

Abstract: A method for producing a steel component provided with a metallic coating which protects against corrosion, comprising the following steps: coating a steel flat product, produced from a low-alloy heat-treated steel, with an Al coating which contains at least 85% wt. Al and optionally up to 15% wt. Si; coating the steel flat product provided with the Al coating with a Zn coating which contains at least 90% wt. Zn; heating the steel flat product to a hot-forming temperature which is at least 750° C.; hot forming the heated steel component made from the steel flat product; and cooling the hot-formed steel component sufficiently quickly to form a tempered or martensitic structure.

Abstract: A flat steel product, and a method for its production, which is formed from a steel substrate, such as strip or sheet steel, and a zinc-based corrosion protection coating, applied to at least one side of the steel substrate, which contains (in wt. %) Mg: 0.25 to 2.5%, Al: 0.2 to 3.0%, Fe: ?4.0%, and optionally in total up to 0.8% of one or more elements of the group Pb, Bi, Cd, Ti, B, Si, Cu, Ni, Co, Cr, Mn, Sn and rare earths, remainder zinc and unavoidable impurities are described. The corrosion protection coating has an Al content of maximum 0.5 wt. % in an intermediate layer extending between a surface layer directly adjacent to the surface of the flat steel product and a border layer adjacent to the steel substrate and with a thickness amounting to at least 20% of the total thickness of the corrosion protection coating.

Abstract: A method for coating a flat steel product manufactured from a high strength steel with a metallic coating, wherein the flat steel product is initially subjected to a heat treatment, in order then, in the heated state, to be hot-dip galvanized with the metallic coating in a melting bath containing overall at least 85% zinc and/or aluminum. The heat treatment includes heating the steel product in a reducing atmosphere, followed by converting a surface of the flat product to an iron oxide layer by a heat treatment lasting 1 to 10 secs in an oxidizing atmosphere, followed by annealing in a reducing atmosphere over a period of time which is longer than the duration of the formation of the iron oxide layer such that the iron oxide layer is reduced at least on its surface to pure iron, followed by cooling the product to a melting bath temperature.

Abstract: A process for melt dip coating a strip of high-tensile steel with alloy constituents including zinc and/or aluminum includes the following steps. The strip is heated in a continuous furnace initially in a reductive atmosphere to a temperature of approximately 650° C., at which the alloy constituents diffuse to the surface in small amounts. The surface, consisting predominantly of pure iron, is converted into an iron oxide layer by a short heat treatment at a temperature of up to 750° C. in a reaction chamber which is integrated in a continuous furnace and has an oxidizing atmosphere. In a subsequent annealing treatment at a higher temperature in a reductive atmosphere, this iron oxide layer prevents the alloy constituents from diffusing to the surface. In the reductive atmosphere, the iron oxide layer is converted into a pure iron layer to which the zinc and/or aluminium are applied in the molten bath with optimum adhesion.

Abstract: The invention relates to a coated steel sheet or strip with a ground coating made of steel, onto at least one upper side of which a coating is applied by hot-dip galvanizing, the coating being formed from a melt consisting of 0.05-0.30% by weight Al and 0.2-2.0% by weight Mg, the remainder being zinc and unavoidable impurities, and, with a coating thickness of a maximum of 3.5 ?m on each side and a coating weight of a maximum 25 g/m2 on each side, guarantees that the steel sheet, in the salt spray mist test carried out in accordance with DIN 50021-SS, shows the first formation of red rust at the earliest after 250 hours. With such a sheet or strip, a flat steel product is provided which possesses an optimum combination of high corrosion resistance and optimum weldability and which is particularly well-suited for use as a material for motor vehicle chassis construction or for the construction of domestic appliances.

Abstract: A thin sheet is coated by hot dip galvanization with a zinc based alloy comprising 3.5% to 15% by weight of aluminum. Immediately after solidification of the coating, the thin sheet is heated for 2 to 10 seconds to a temperature 20 to 100° C. above the melting point of the coating. The thin sheet is then cooled to room temperature.

Abstract: A method of independently adjusting the fuel mixture composition and heating rate for a multiburner shaft furnace for the melting of metal, particularly copper and its alloys, fed in lump form to the shaft furnace, in which the burners are supplied with air and fuel gas and the heating rate is adjusted by controlling the pressure of one of the components of the fuel mixture (air or gas) in the manifold for supplying this component to a group of burners. The other fuel mixture component has its pressure controlled in its manifold by a single controller constituted by a pressure ratio controller.