Arcelormittal

Arcelormittal Investigacion Y Desarrollo, S.l.

Thyssenkrupp Steel Europe Ag

Arcelormittal France

Thyssenkrupp Steel Ag

Christian Allely

Tiago Machado Amorim

Hassan Ghassemi-Armaki

Anirban Chakraborty

Pascal Bertho

Daniel Chaleix

Colin Scott

Raisa Grigorieva

Maxime Monnoyer

Philippe Cugy

David Dussaussois

Pascale Feltin

Joost De Strycker

Jean-Michel Mataigne

Luc Diez

Emmanuel Lucas

Martin Beauvais

Sebastian Cobo

Anis Aouafi

Beril Corlu

Krista Godelieve Oscar Van Den Bergh

Grégory Leuillier

Julie Chassagne

Eric Silberberg

Sergio Pace

Lydia Rachiele

Jacques Petitjean

Lucie Gaouyat

Eric Jacqueson

Daniel Jacques

Frida Gilbert

Audrey Lhermeroult

Jean-Michel Lemaire

Delphine Thai

Joëlle Richard

Laurence Dosdat

Stéphane Morel

Astrid Coffigny

Astrid Coffigny-Gregoire

Krista Godelieve Van Den Bergh

Gregory Leuillier

Stephane Morel

A hot formed pre-coated steel part includes a steel sheet precoated with a metallic coating and hot formed, the coating including: 2.0 to 24.0% by weight of zinc; 1.1 to 7.0% by weight of silicon; optionally from 0.5 to 3.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr or Hf, a content by weight of each additional element being less than 0.3% by weight, a balance being aluminum, unavoidable impurities and residual elements resulting from feeding ingots or from a passage of the steel sheet in a molten bath; and a ratio Al/Zn by weight greater than 2.9, where a microstructure in the steel after said hot forming being martensitic or martensitic-bainitic or made of at least 75% of equiaxed ferrite, 5 to 20% of martensite and bainite in an amount less than or equal to 10%.

Hot formed pre-coated steel part

A pre-coated steel sheet includes a steel sheet precoated with a metallic coating, the coating including: 2.0 to 24.0% by weight of zinc; 1.1 to 7.0% by weight of silicon; optionally from 0.5 to 3.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr or Hf, a content by weight of each additional element being less than 0.3% by weight, a balance being aluminum, unavoidable impurities and residual elements resulting from feeding ingots or from a passage of the steel sheet in a molten bath; a ratio Al/Zn by weight greater than 2.9, wherein the coating does not include In and the coating does not include Sn.

Coated steel sheet

The invention relates to a steel substrate coated on at least one of its faces with a metallic coating based on zinc or its alloys wherein the metallic coating is itself coated with a conversion layer comprising:

Metal sheet treatment method and metal sheet treated with this method

The present invention relates to a method for the manufacture of a coated steel sheet comprising the following successive steps: A. the coating of the steel sheet with a first coating consisting of nickel and having a thickness between 600 nm and 1400 nm, the steel sheet having the following composition in weight: 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0%, and on a purely optional basis, one or more elements such as Nb≤0.5%, B≤0.010%, Cr≤1.0%, Mo≤0.50%, Ni≤1.0%, Ti≤0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, B. the recrystallization annealing at a temperature between 820 to 1200° C., C. the coating with a second coating based on zinc not comprising nickel.

Method for the manufacturing of liquid metal embrittlement resistant zinc coated steel sheet

The present invention relates to a method for the manufacture of a galvannealed steel sheet including the steps of A.) coating of the steel sheet with a first coating consisting of nickel and having a thickness between 150 nm and 650 nm, the steel sheet having the following composition in weight percentage 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0%, and on a purely optional basis, one or more elements such as Nb≤0.5%, B≤0.010%, Cr≤1.0%, Mo≤0.50%, Ni≤1.0%, Ti≤0.5%., the remainder of the composition is made up of iron and inevitable impurities resulting from the elaboration, B.) annealing of the coated steel sheet being annealed at a temperature between 600 to 1200° C., C.) coating of the steel sheet obtained in step B.) with a second coating based on zinc and D.) an alloying heat treatment to form a galvannealed steel sheet.

Method for the manufacturing of liquid metal embrittlement resistant galvannealed steel sheet

A hardened part coated with a phosphatable coating is provided. The part is made by a method that includes providing a steel sheet pre-coated with a metallic coating including from 4.0 to 20.0% by weight of zinc, from 1.0 to 3.5% by weight of silicon, optionally from 1.0 to 4.0% by weight of magnesium, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight, the balance being aluminum and unavoidable impurities and residuals elements. The steel sheet is cut to obtain a blank, the blank is thermally treated at a temperature between 840 and 950° C. to obtain a fully austenitic microstructure in the steel, the blank is transferred into a press tool and hot-formed to obtain a part. The part is cooled to obtain a martensitic or martensitic-bainitic microstructure or made of at least 75% of equiaxed ferrite, from 5 to 20% of martensite and bainite in amount less than or equal to 10%.

Phosphatable part starting from a steel sheet coated with a metallic coating based on aluminum

A steel sheet with a metallic coating is provided. A composition of the metallic coating includes from 2.0 to 24.0% by weight of zinc, from 7.1 to 12.0% by weight of silicon, optionally from 1.1 to 8.0% by weight of magnesium, and optionally additional elements chosen from Pb, Ni, Zr, or Hf. The content by weight of each additional element is less than 0.3%. A balance of the composition is aluminum, unavoidable impurities and residual elements. A ratio Al/Zn is from 4.0 to 6.0.

Steel sheet coated with a metallic coating based on aluminum

A rolled steel sheet, for press hardening is provided, having a chemical composition where Ti/N>3.42, and the carbon, manganese, chromium and silicon contents satisfy: The sheet has a nickel content Niat any point of the steel in the vicinity of the surface over a depth Δ, such that: Ni>Ni, Nidenoting the nominal nickel content of the steel, and such that, Nidenoting the maximum nickel content within Δ: and such that: and the surface density of all of the particles D, and the surface density of the particles Dlarger than 2 micrometers satisfy, at least to a depth of 100 micrometers in the vicinity of the surface of said sheet:6.75<270Dand Dbeing expressed as number of particles per square millimeter, and said particles denoting all the oxides, sulfides, and nitrides, either pure or combined such as oxysulfides and carbonitrides, present in the steel matrix.

Method for producing high-strength steel parts with improved ductility, and parts obtained by said method

A steel sheet coated with a coating comprising from 10 to 40% of nickel, the balance being zinc, such steel sheet having a microstructure comprising from 1 to 50% of residual austenite, from 1 to 60% of martensite and optionally at least one element chosen from: bainite, ferrite, cementite and pearlite, and the following chemical composition in weight: 0.10&#x3c;C&#x3c;0.50%, 1.0&#x3c;Mn&#x3c;5.0%, 0.7&#x3c;Si&#x3c;3.0%, 0.05&#x3c;Al&#x3c;1.0%, 0.75&#x3c;(Si+Al)&#x3c;3.0% and on a purely optional basis, one or more elements such as Nb&#x2264;0.5%, B&#x2264;0.005%, Cr&#x2264;1.0%, Mo&#x2264;0.50%, Ni&#x2264;1.0%, Ti&#x2264;0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration.

Method for the manufacture of a coated steel sheet

A coated metallic substrate including at least a first coating of aluminum, such first coating having a thickness below 5 &#x3bc;m and being directly topped by a second coating including from 0.5 to 5.9% by weight of magnesium, the balance being zinc.

Coated metallic substrate

The present invention relates to a method for the manufacture of a galvannealed steel sheet including the steps of A.) coating of the steel sheet with a first coating consisting of nickel and having a thickness between 150 nm and 650 nm, the steel sheet having the following composition in weight percentage 0.10&#x3c;C&#x3c;0.40%, 1.5&#x3c;Mn&#x3c;3.0%, 0.7&#x3c;Si&#x3c;3.0%, 0.05&#x3c;Al&#x3c;1.0%, 0.75&#x3c;(Si+Al)&#x3c;3.0%, and on a purely optional basis, one or more elements such as Nb&#x2264;0.5%, B&#x2264;0.010%, Cr&#x2264;1.0%, Mo&#x2264;0.50%, Ni&#x2264;1.0%, Ti&#x2264;0.5%, the remainder of the composition is made up of iron and inevitable impurities resulting from the elaboration, B.) annealing of the coated steel sheet being annealed at a temperature between 600 to 1200&#xb0; C., C.) coating of the steel sheet obtained in step B.) with a second coating based on zinc and D.) an alloying heat treatment to form a galvannealed steel sheet.

The present invention relates to a method for the manufacture of a coated steel sheet comprising the following successive steps: A. the coating of the steel sheet with a first coating consisting of nickel and having a thickness between 600 nm and 1400 nm, the steel sheet having the following composition in weight: 0.10&#x3c;C&#x3c;0.40%, 1.5&#x3c;Mn&#x3c;3.0%, 0.7&#x3c;Si&#x3c;3.0%, 0.05&#x3c;Al&#x3c;1.0%, 0.75&#x3c;(Si+Al)&#x3c;3.0%, and on a purely optional basis, one or more elements such as Nb&#x2264;0.5%, B&#x2264;0.010%, Cr&#x2264;1.0%, Mo&#x2264;0.50%, Ni&#x2264;1.0%, Ti&#x2264;0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, B. the recrystallization annealing at a temperature between 820 to 1200&#xb0; C., C. the coating with a second coating based on zinc not comprising nickel.

A rolled steel sheet, for press hardening is provided, having a chemical composition where Ti/N&#x3e;3.42, and the carbon, manganese, chromium and silicon contents satisfy: The sheet has a nickel content Niat any point of the steel in the vicinity of the surface over a depth &#x394;, such that: Ni&#x3e;Ni, Nidenoting the nominal nickel content of the steel, and such that, Nidenoting the maximum nickel content within &#x394;: and such that: and the surface density of all of the particles Dand the surface density of the particles Dlarger than 2 micrometers satisfy, at least to a depth of 100 micrometers in the vicinity of the surface of said sheet:+6.75 D&#x3c;270Dand Dbeing expressed as number of particles per square millimeter, and said particles denoting all the oxides, sulfides, and nitrides, either pure or combined such as oxysulfides and carbonitrides, present in the steel matrix.

A method for the manufacture of a hardened part coated with a phosphatable coating is provided. The method includes providing a steel sheet pre-coated with a metallic coating including from 4.0 to 20.0% by weight of zinc, from 1.0 to 3.5% by weight of silicon, optionally from 1.0 to 4.0% by weight of magnesium, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight, the balance being aluminum and unavoidable impurities and residuals elements. The steel sheet is cut to obtain a blank, the blank is thermally treated at a temperature between 840 and 950&#xb0; C. to obtain a fully austenitic microstructure in the steel, the blank is transferred into a press tool and hot-formed to obtain a part. The part is cooled to obtain a martensitic or martensitic-bainitic microstructure or made of at least 75% of equiaxed ferrite, from 5 to 20% of martensite and bainite in amount less than or equal to 10%.

Method for the manufacture of a phosphatable part starting from a steel sheet coated with a metallic coating based on aluminum

An Al-steel assembly is provided. The assembly includes an aluminum-based element and a steel element on at least one surface of the aluminum-based element. The steel element has a metal coating made of a zinc-aluminum-magnesium alloy and includes from 2.3% to 3.3% by weight of magnesium and from 3.6% to 3.9% by weight of aluminum. A coated surface of the steel element is in contact with the aluminum-based element in an assembly zone and a protective coating coats the assembly around and adjacent the assembly zone. A body-in-white, further assembly and method are also provided.

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Metz, France

Christian Allely