Abstract: 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: 2.6 C + Mn 5.3 + Cr 13 + Si 15 ? 1.1 % . The sheet has a nickel content Nisurf at any point of the steel in the vicinity of the surface over a depth ?, such that: Nisurf>Ninom, Ninom denoting the nominal nickel content of the steel, and such that, Nimax denoting the maximum nickel content within ?: ( Ni max + Ni nom ) 2 × ( ? ) ? 0.6 , and such that: ( Ni max - Ni nom ) ? ? 0.01 and the surface density of all of the particles Di, and the surface density of the particles D(>2 ?m) larger than 2 micrometers satisfy, at least to a depth of 100 micrometers in the vicinity of the surface of said sheet: Di+6.

Abstract: 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: 2.6 C + Mn 5.3 + Cr 13 + Si 15 ? 1.1 % . The sheet has a nickel content Nisurf at any point of the steel in the vicinity of the surface over a depth ?, such that: Nisurf>Ninom, Ninom denoting the nominal nickel content of the steel, and such that, Nimax denoting the maximum nickel content within ?: ( Ni max + Ni nom ) 2 × ( ? ) ? 0.6 , and such that: ( Ni max - Ni nom ) ? ? 0.01 and the surface density of all of the particles Di , and the surface density of the particles D(>2 ?m) larger than 2 micrometers satisfy, at least to a depth of 100 micrometers in the vicinity of the surface of said sheet: Di+6.

Abstract: 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: 2.6 ? C + Mn 5.3 + Cr 13 + Si 15 ? 1.1 ? % . The sheet has a nickel content Nisurf at any point of the steel in the vicinity of the surface over a depth ?, such that: Nisurf >Ninom, Ninom denoting the nominal nickel content of the steel, and such that, Nimax denoting the maximum nickel content within ?: ( Ni max + Ni nom ) 2 × ( ? ) ? 0.6 , and such that: ( Ni max - Ni nom ) ? ? 0.01 and the surface density of all of the particles Di and the surface density of the particles D(>2 ?m) larger than 2 micrometers satisfy, at least to a depth of 100 micrometers in the vicinity of the surface of said sheet: Di+6.

Abstract: The present invention provides fabrication methods for cold rolled, precoated and press hardened steel sheets, for which the chemical composition includes, with contents expressed by weight, 0.24%?C?0.38%, 0.40%?Mn?3%, 0.10%?Si?0.70%, 0.015%?Al?0.070%, 0%?Cr?2%, 0.25%?Ni?2%, 0.015%?Ti?0.10%, 0%?Nb?0.060%, 0.0005%?B?0.0040%, 0.003%?N?0.010%, 0.0001%?S?0.005%, 0.0001%?P?0.025%, it being understood that the titanium and nitrogen content satisfy: Ti/N>3.42, and that the carbon, manganese, chromium and silicon content satisfy: 2.6C+Mn/5.3+Cr/13+Si/15?1.1%, with the chemical composition optionally including one or more of the following elements: 0.05%?Mo?0.65%, 0.001%?W?0.30%, 0.0005%?Ca?0.005%, with the remainder made up of iron and inevitable impurities coming from preparation.

Abstract: 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: 2.6 ? C + Mn 5.3 + Cr 13 + Si 15 ? 1.1 ? % . The sheet has a nickel content Nisurf at any point of the steel in the vicinity of the surface over a depth ?, such that: Nisurf >Ninom, Ninom denoting the nominal nickel content of the steel, and such that, Nimax denoting the maximum nickel content within ?: ( Ni max + Ni nom ) 2 × ( ? ) ? 0.6 , and such that: ( Ni max - Ni nom ) ? ? 0.01 and the surface density of all of the particles Di and the surface density of the particles D(>2 ?m) larger than 2 micrometers satisfy, at least to a depth of 100 micrometers in the vicinity of the surface of said sheet: Di+6.

Abstract: The present invention provides a rolled steel sheet, for press hardening, for which the chemical composition includes, with contents expressed by weight, 0.24%?C?0.38%, 0.40%?Mn?3%, 0.10%?Si?0.70%, 0.015%?Al?0.070%, 0%?Cr?2%, 0.25%?Ni?2%, 0.015%?Ti?0.10%, 0%?Nb?0.060%, 0.0005%?B?0.0040%, 0.003%?N?0.010%, 0.0001%?S?0.005%, 0.0001%?P?0.025%, it being understood that the titanium and nitrogen content satisfy: Ti/N>3.42, and that the carbon, manganese, chromium and silicon content satisfy: 2.6 ? C + Mn 5.3 + Cr 13 + Si 15 ? 1.1 ? % , with the chemical composition optionally including one or more of the following elements: 0.05%?Mo?0.65%, 0.001%?W?0.30%, 0.0005%?Ca?0.005%, with the remainder made up of iron and inevitable impurities coming from preparation.

Abstract: The present invention provides a rolled steel sheet, for press hardening, for which the chemical composition includes, with contents expressed by weight, 0.24%?C?0.38%, 0.40%?Mn?3%, 0.10%?Si?0.70%, 0.015%?Al?0.070%, 0%?Cr?2%, 0.25%?Ni?2%, 0.015%?Ti?0.10%, 0%?Nb?0.060%, 0.0005%?B?0.0040%, 0.003%?N?0.010%, 0.0001%?S?0.005%, 0.0001%?P?0.025%, it being understood that the titanium and nitrogen content satisfy: Ti/N>3.42, and that the carbon, manganese, chromium and silicon content satisfy: 2.6 ? C + Mn 5.3 + Cr 13 + Si 15 ? 1.1 ? % , with the chemical composition optionally including one or more of the following elements: 0.05%?Mo?0.65%, 0.001%?W?0.30%, 0.0005%?Ca?0.005%, with the remainder made up of iron and inevitable impurities coming from preparation.

Abstract: The present invention provides a rolled steel sheet, for press hardening, for which the chemical composition includes, with contents expressed by weight, 0.24%?C?0.38%, 0.40%?Mn?3%, 0.10%?Si?0.70%, 0.015%?Al?0.070%, 0%?Cr?2%, 0.25%?Ni?2%, 0.015%?Ti?0.10%, 0%?Nb?0.060%, 0.0005%?B?0.0040%, 0.003%?N?0.010%, 0.0001%?S?0.005%, 0.0001%?P?0.025%, it being understood that the titanium and nitrogen content satisfy: Ti/N>3.42, and that the carbon, manganese, chromium and silicon content satisfy: 2.6 ? ? C + Mn 5.3 + Cr 13 + Si 15 ? 1.1 ? % , with the chemical composition optionally including one or more of the following elements: 0.05%?Mo?0.65%, 0.001%?W?0.30%, 0.0005%?Ca?0.005%, with the remainder made up of iron and inevitable impurities coming from preparation.