JEF STEEL CORPORATION Patent applications |
Patent application number | Title | Published |
20160091140 | HYDROGEN STORAGE TANK (AS AMENDED) - A hydrogen storage tank includes a liner layer to store hydrogen and a carbon fiber reinforced plastic layer disposed outside the liner layer. The liner layer is formed from a low-alloy steel, and the carbon fiber forming the carbon fiber reinforced plastic layer is a pitch based carbon fiber. | 03-31-2016 |
20150299828 | STEEL SHEET FOR THREE-PIECE CAN AND METHOD FOR MANUFACTURING THE SAME - Provided are a steel sheet for a can having high buckling strength for a can body against an external force and excellent formability when being formed into a shape having a design effect by additionally giving elongation strain in the circumferential direction after the steel sheet having been formed into a cylindrical shape and a method for manufacturing the steel sheet. The chemical composition is controlled to contain, by mass %, C: 0.0005% or more and 0.0035% or less, Si: 0.050% or less, Mn: more than 0.60% and 1.00% or less, P: 0.030% or less, S: 0.020% or less, Al: 0.010% or more and 0.100% or less, N: 0.0030% or less, B: 0.0005% or more, and the balance being Fe and inevitable impurities, in which the relationship B/N≧0.50 is satisfied where B/N represents | 10-22-2015 |
20150030881 | METHOD FOR MANUFACTURING HIGH STRENGTH GALVANIZED STEEL SHEET AND HIGH STRENGTH GALVANIZED STEEL SHEET (AS AMENDED) - A method for manufacturing a high strength galvanized steel sheet and a high strength galvanized steel sheet are provided. A high strength galvanized steel sheet having a zinc coating layer with an amount of deposition of coating of 20 to 120 g/m | 01-29-2015 |
20150030880 | HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME - The present invention provides a high-strength hot-rolled steel sheet having both excellent strength and excellent workability (particularly, bending workability), and a method of producing the same. | 01-29-2015 |
20150027596 | STEEL SHEET FOR HOT PRESS-FORMING, METHOD FOR MANUFACTURING THE SAME, AND METHOD FOR PRODUCING HOT PRESS-FORMED PARTS USING THE SAME - The invention provides a steel sheet for hot press-forming that can reliably give hot press-formed parts having excellent paint adhesiveness, perforation corrosion resistance and joint corrosion resistance, and also provides a method for manufacturing the steel sheet for hot press-forming, and a method for producing hot press-formed parts using the steel sheet for hot press-forming. The steel sheet for hot press-forming includes a base steel sheet and a Zn-based coating layer with a mass of coating of 10 to 90 g/m | 01-29-2015 |
20140299238 | HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME - A hot rolled steel sheet has a chemical composition including, by mass %, C: 0.060% to 0.120%; Si: 0.10% to 0.70%; Mn: 1.00% to 1.80%; P: 0.10% or less; S: 0.010% or less; Al: 0.01% to 0.10%; N: 0.010% or less; Nb: 0.010% to 0.100%, wherein Nb is contained so that content of solute Nb is 5% or more relative to the total Nb content; the balance being Fe and incidental impurities. The hot rolled steel sheet has a microstructure containing ferrite of not more than 15 μm in average crystal grain diameter by a volume fraction of not less than 75%, the balance being low-temperature-induced phases. The hot rolled steel sheet can be suitably utilized for manufacturing a cold rolled steel sheet or hot-dip galvanized steel sheet having a tensile strength of 590 MPa or more, excellent in material homogeneity and capable of giving excellent cold rolling property. | 10-09-2014 |
20090120541 | High-Strength Steel Plate, Method of Producing the Same, and High-Strength Steel Pipe - The present invention provides a high-strength steel plate having excellent resistance to cutting crack, excellent Charpy absorbed energy, excellent DWTT properties, a low yield ratio, and a tensile strength of 900 MPa or more, a method of producing the steel plate, and a high-strength steel pipe using the steel plate. As solving means, a steel plate contains, by % by mass, 0.03 to 0.12% of C, 0.01 to 0.5% of Si, 1.5 to 3% of Mn, 0.01 to 0.08% of Al, 0.01 to 0.08% of Nb, 0.005 to 0.025% of Ti, 0.001 to 0.01% of N, and at least one component of 0.01 to 2% of Cu, 0.01 to 3% of Ni, 0.01 to 1% of Cr, 0.01 to 1% of Mo, and 0.01 to 0.1% of V; wherein the contents of Ca, O, and S satisfy the equation below; the microstructure includes ferrite and a second hard phase, the area fraction of ferrite being 10 to 50%; cementite in the second phase has an average grin size of 0.5 μm or less; and the total amount of Nb and the like contained in carbides thereof present in steel is 10% or less of the total content in steel. | 05-14-2009 |