Abstract: A martensitic steel alloy is provided. The martensitic steel alloy includes carbon from 0.22 to 0.36 wt. %, manganese from 0.5% to 2.0% wt. %, and chromium in an amount less than 0.10 wt. %. and a carbon equivalent Ceq of less than 0.44 in which Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. Ceq is the carbon equivalent, C, Mn, Cr, Mo, V, Ni, and Cu are in wt. % of the elements in the alloy. The alloy has an ultimate tensile strength of at least 1700 MPa.

Abstract: A martensitic steel alloy is provided. The martensitic steel alloy includes carbon from 0.22 to 0.36 wt. %, manganese from 0.5% to 2.0% wt. %, and chromium in an amount less than 0.10 wt. %. and a carbon equivalent Ceq of less than 0.44 in which Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. Ceq is the carbon equivalent, C, Mn, Cr, Mo, V, Ni, and Cu are in wt. % of the elements in the alloy. The alloy has an ultimate tensile strength of at least 1700 MPa.

Abstract: A martensitic steel alloy is provided. The martensitic steel alloy includes carbon from 0.22 to 0.36 wt. %, manganese from 0.5% to 2.0% wt. %, and chromium in an amount less than 0.10 wt. %. and a carbon equivalent Ceq of less than 0.44 in which Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. Ceq is the carbon equivalent, C, Mn, Cr, Mo, V, Ni, and Cu are in wt. % of the elements in the alloy. The alloy has an ultimate tensile strength of at least 1700 MPa.

Abstract: A cold rolled and annealed martensitic steel sheet is provided. The steel sheet includes by weight percent, 0.30?C?0.5%, 0.2?Mn?1.5%, 0.5?Si?3.0%, 0.02?Ti?0.05%, 0.001?N?0.008%, 0.0010?B?0.0030%, 0.01?Nb?0.1%, 0.2?Cr?2.0%, P?0.02%, S?0.005%, Al?1%, Mo?1% and Ni?0.5%. The remainder of the composition includes iron and unavoidable impurities resulting from melting. The microstructure is 100% martensitic and a prior austenite grain size is lower than 20 ?m. The steel sheet has a delayed fracture resistance of at least 24 hours during an acid immersion U-bend test. A method, part, structural member and vehicle are also provided.

Abstract: A cold rolled and annealed martensitic steel sheet is provided. The steel sheet includes by weight percent, 0.30?C?0.5%, 0.2?Mn?1.5%, 0.5?Si?3.0%, 0.02?Ti?0.05%, 0.001?N?0.008%, 0.0010?B?0.0030%, 0.01?Nb?0.1%, 0.2?Cr?2.0%, P?0.02%, S?0.005%, Al?1%, Mo?1% and Ni?0.5%. The remainder of the composition includes iron and unavoidable impurities resulting from melting. The microstructure is 100% martensitic and a prior austenite grain size is lower than 20 ?m. The steel sheet has a delayed fracture resistance of at least 24 hours during an acid immersion U-bend test. A method, part, structural member and vehicle are also provided.

Abstract: Martensitic steel compositions and methods of production thereof. More specifically, the martensitic steels have tensile strengths ranging from 1700 to 2200 MPa. Most specifically, the invention relates to thin gage (thickness of ?1 mm) ultra high strength steel with an ultimate tensile strength of 1700-2200 MPa and methods of production thereof.

Abstract: Martensitic steel compositions and methods of production thereof are provided. More specifically, a martensitic steel having tensile strengths ranging from 1700 to 2200 MPa are provided. Most specifically, the present invention provides thin gage (thickness of ?1 mm) ultra high strength steel with an ultimate tensile strength of 1700 to 2200 MPa and methods of production thereof.