HIGH TENSILE STRENGTH HOT ROLLED STEEL PLATE EXCELLENT IN WORKABILITY, AND ITS PRODUCTION
PROBLEM TO BE SOLVED: To produce a high tensile strength hot rolled steel plate excellent in punch stretch formability, shape freezability, and stretch-flange formability and haying superior multiple press formability, under the process conditions capable of setting over a wide range. SOLUTION: A st...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To produce a high tensile strength hot rolled steel plate excellent in punch stretch formability, shape freezability, and stretch-flange formability and haying superior multiple press formability, under the process conditions capable of setting over a wide range. SOLUTION: A steel stock, having a composition consisting of, by weight, 0.010-0.10% C, 0.50-1.50% Si, 0.50-2.00% Mn, 0.01-0.15% P, =2 kinds among 0.005-0.03% Ti, 0.005-0.03% V, and 0.01-0.06% Nb, and the balance Fe with inevitable impurities, is used. The steel stock is held at 900-1300 deg.C for |
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