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Fushiwaki

Yusuke Fushiwaki, Tokyo JP

Patent application number	Description	Published
20110008546	PROCESSES FOR PRODUCING HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND HIGH-STRENGTH GALVANNEALED STEEL SHEET - A method for manufacturing a high strength hot-dip galvanized steel sheet includes: heating a steel sheet in a CGL, the steel sheet including on a mass percent basis, as chemical components, 0.005% to 0.12% of C, 0.7% to 1.8% of Si, 0.5% to 2.8% of Mn, 0.1% or less of P, 0.07% or less of S, 1.0% or less of Al, 0.008% or less of N, and the balance being Fe and incidental impurities; annealing at 700-940° C. for 15-600 seconds; cooling to 440-550° C. at 3° C./s or more; dipping the steel sheet at 440-550° C. into a hot-dip galvanizing bath at a temperature of 440 to 500° C. for 200 seconds or less to perform hot-dip galvanizing. By the method described above, a high strength hot-dip galvanized steel sheet having a tensile strength level of 590 MPa, which has good coating appearance and superior formability, is obtained.	01-13-2011
20110253263	HOT-DIP GALVANIZED STEEL SHEET AND MANUFACTURING METHOD THEREOF - A galvanized steel sheet includes a zinc plating layer which is disposed on a steel sheet containing 0.01% to 0.15% C, 0.001% to 2.0% Si, 0.1% to 3.0% Mn, 0.001% to 1.0% Al, 0.005% to 0.060% P, and 0.01% or less S on a mass basis, the remainder being Fe and unavoidable impurities, and which has a mass per unit area 20 g/m	10-20-2011

Yusuke Fushiwaki, Hiroshima JP

Patent application number	Description	Published
20100112377	GALVANIZED HIGH STRENGTH STEEL SHEET AND METHOD FOR PRODUCING THEREOF - A high-strength galvanized steel sheet is provided which has a tensile strength of a level of about 590 MPa and superior formability, including a coating with good appearance. The galvanized steel sheet includes a base steel and a galvanized coating layer formed over the surface of the base steel. The galvanized steel sheet has a chemical composition containing 0.005% to 0.12% of C, 0.7% to 2.7% of Si, 0.5% to 2.8% of Mn, 0.1% or less of P, 0.07% or less of S, 1.0% or less of Al, 0.008% or less of N, and the balance being Fe and inevitable impurities on a mass basis, and a microstructure constituted of at least 90% of ferrite and 2% to 10% of martensite on an area basis. The ferrite has a Vickers hardness of 120 or more on average, and an inclusion is precipitated from the grain boundary with a length of 50% or less relative to the entire length of the grain boundary in the surface layer of the base steel with a depth of 3 μm from the interface between the coating layer and the base steel.	05-06-2010

Yusuke Fushiwaki, Fukuyama JP

Patent application number	Description	Published
20110217569	GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME - A galvanized steel sheet includes a basal steel sheet (BSS) containing C: 0.01-0.15%, Si: 0.001-2.0%, Mn: 0.1-3.0%, Al: 0.001-1.00, P: 0.005-0.060%, and S≦0.01% (all % by mass), balance is Fe and unavoidable impurities; zinc plating layers on both sides of the BSS with 20-120 g/m	09-08-2011

Yusuke Fushiwaki, Fukuyama-Shi JP

Patent application number	Description	Published
20120018060	HIGH-STRENGTH GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME - Provided is a method for manufacturing a high-strength galvanized steel sheet, made from a steel sheet containing Si and/or Mn, having excellent exfoliation resistance during heavy machining. When a steel sheet containing 0.01% to 0.18% C, 0.02% to 2.0% Si, 1.0% to 3.0% Mn, 0.001% to 1.0% Al, 0.005% to 0.060% P, and 0.01% or less S on a mass basis, the remainder being Fe and unavoidable impurities, is annealed and galvanized in a continuous galvanizing line, a temperature region with a furnace temperature of A° C. to B° C. (600≦A≦780 and 800≦B≦900) is performed at an atmosphere dew-point temperature of −5° C. or higher in a heating process.	01-26-2012