Nucor Corporation

Teck Metals Ltd.

Weiping Sun

Yihui Liu

Nan Gao

The present disclosure relates to coated steel strip providing the steel with cathodic protection before and after the steel is press hardened or hot formed at a high austenitization temperature up to 950° C. The coating of the coated steel strip comprises zinc, aluminum, and at least one element selected from manganese (Mn) and/or antimony (Sb).

Zinc alloy coated press-hardenable steels and method of manufacturing the same

The present disclosure relates to a coating of a press hardened steel strip, the coating providing cathodic protection. The coating of the post-press hardened steel strip comprises zinc, aluminum, and at least one element selected from manganese (Mn) and/or antimony (Sb).

Zinc alloy coating layer of press-hardenable steel

A hot rolled, ultra-high strength, complex metallographic structured or multi-phase structured steel that improves formability during stamping or forming process, while possessing one or more of the following properties: excellent castability, rollability and coatability, excellent structural performance, excellent stretch formability, excellent stretch flangeability, excellent dent resistance, excellent durability, excellent impact performance, excellent intrusion and crash resistance without the purposeful addition of boron.

Multiphase ultra-high strength hot rolled steel

A galvanized dual phase steel sheet with a martensite phase and a ferrite phase and a composition containing within the following ranges by weight: carbon from about 0.01% to about 0.18%; manganese from about 0.2% to about 3%; silicon&#x2264;about 1.2%; aluminum from about 0.01% to about 0.1%; one or both of chromium and nickel from about 0.1% to about 3.5%; calcium from about 0.0003% to about 0.01%; phosphorus&#x2264;about 0.1%; sulfur&#x2264;about 0.03%; nitrogen&#x2264;about 0.02%; molybdenum&#x2264;about 1%; one or more of niobium and titanium&#x2264;about 1%; and boron&#x2264;about 0.006% by weight; and with the balance of the composition being iron and incidental ingredients. The steel sheet may be both galvanized and galvannealed.

High strength, hot dip coated, dual phase, steel sheet and method of manufacturing same

Method of manufacture of multiphase, hot-rolled ultra-high strength steel

A cold-rolled ultra-high strength, multi-phase structured steel is disclosed with improved stamping and forming performance during manufacturing processes, while possessing one or more of the following properties: excellent castability and rollability, excellent galvanizability and/or coatability, excellent formability, excellent fracture resistance, excellent stretch formability and stretch flangeability, excellent dent resistance, excellent durability, excellent impact performance and structural performance, excellent intrusion and crash resistance, and excellent weldability, without the purposeful addition of boron.

Method of manufacture of multiphase, cold-rolled ultra-high strength steel

A multi-phase steel sheet having microstructure having in combination ferrite, martensite of between 3% and 65% by volume, and at least one microstructure selected from the group consisting of, bainite and retained austenite, and having fine complex precipitates selected from the group of TiC, NbC, TiN, NbN, (Ti.Nb)C, (Ti.Nb)N, and (Ti.Nb)(C.N) particles having at least 50% smaller than 20 nm in size, and physical properties having tensile strength greater than about 780 megapascals and at least one of the properties of elongation greater than about 10%, yield ratio greater than about 70%, and hole expansion ratio greater than about 50%.

Complex metallographic structured high strength steel and method of manufacturing

Complex metallographic structured high strength steel and manufacturing same

A method of making hot rolled steel sheet having a dual phase microstructure with a martensite phase of less than 35% by volume and a ferrite phase of more than 50% by volume and a composition containing by percent weight: 0.01&#x2266;C&#x2266;0.2; 0.3&#x2266;Mn&#x2266;3; 0.2&#x2266;Si&#x2266;2; 0.2&#x2266;Cr+Ni&#x2266;2; 0.01&#x2266;Al&#x2266;0.10; Mo less than about 0.2%, 0.0005&#x2266;Ca&#x2266;0.01, with the balance iron and incidental ingredients. Hot rolled sheet for cold rolling, the silicon range may be from about 0.05% to about 2%, and the amount of molybdenum may be up to 0.5%. Also, the hot rolled steel sheet has a tensile strength of at least 500 megapascals, a hole expansion ratio more than about 50%, and a yield strength/tensile strength ratio less than 70%.

Method of making hot rolled dual phase steel sheet

A hot rolled steel sheet having a dual phase microstructure with a martensite phase of less than 35% by volume and a ferrite phase of more than 50% by volume and a composition containing by percent weight: 0.01&#x2266;C&#x2266;0.2; 0.3&#x2266;Mn&#x2266;3; 0.2&#x2266;Si&#x2266;2; 0.2&#x2266;Cr+Ni&#x2266;2; 0.01&#x2266;Al&#x2266;0.10; Mo less than about 0.2%, 0.0005&#x2266;Ca&#x2266;0.01, with the balance iron and incidental ingredients. Hot rolled sheet for cold rolling, the silicon range may be from about 0.05% to about 2%, and the amount of molybdenum may be up to 0.5%. Also, the hot rolled steel sheet has a tensile strength of at least 500 megapascals, a hole expansion ratio more than about 50%, and a yield strength/tensile strength ratio less than 70%.

Hot rolled dual phase steel sheet

A steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: 0.01&#x2266;C&#x2266;0.2; 0.3&#x2266;Mn&#x2266;3; 0.05&#x2266;Si&#x2266;2; 0.2&#x2266;Cr+Ni&#x2266;2; 0.01&#x2266;Al&#x2266;0.10; 0.0005&#x2266;Ca&#x2266;0.01, with the balance of the composition being iron and incidental ingredients. Also, the steel sheet is made by a batch annealing method, and has a tensile strength of at least approximately 400 megapascals and an n-value of at least approximately 0.175.

Method of making cold rolled dual phase steel sheet

A steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: 0.01% to 0.2% C; 0.3% to 3% Mn; 0.05% to 2% Si; 0.1% to 2% Cr; 0.01% to 0.10% Al; and 0.0005% to 0.01% Ca, with the balance of the composition being iron and incidental ingredients. Also, the steel sheet is made by a batch annealing method, and has a tensile strength of at least approximately 400 MPa and an n-value of at least approximately 0.175.

Cold rolled dual-phase steel sheet

A galvanized steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: carbon in a range from about 0.01% to about 0.18%; manganese in a range from about 0.2% to about 3%; silicon &#x2266; about 1.2%; aluminum in a range from about 0.01% to about 0.1%; one or both of chromium and nickel in a range from about 0.1% to about 3.5%; calcium in a range from about 0.0003% to about 0.01%; phosphorus &#x2266; about 0.01%; sulfur &#x2266; about 0.03%; nitrogen &#x2266; about 0.02%; molybdenum &#x2266; about 1%; copper &#x2266; about 0.8%; one or more of niobium, titanium, and vanadium &#x2266; about 1%; and boron &#x2266; about 0.006% by weight; and with the balance of the composition being iron and incidental ingredients. In one embodiment, the steel sheet is both galvanized and galvannealed.

A steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: 0.01% to 0.2% C; 0.3% to 3% Mn; 0.05% to 2% Si; 0.1% to 2% Cr; 0.01% to 0.10 Al; and 0.0005% to 0.01% Ca, with the balance of the composition being iron and incidental ingredients. Also, the steel sheet is made by a batch annealing method, and has a tensile strength of at least approximately 400 MPa and an n-value of at least approximately 0.175.

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Canton, MI, United States of America

Weiping Sun