发明名称 |
METHOD FOR MANUFACTURING HIGH STRENGTH GALVANIZED STEEL SHEET AND HIGH STRENGTH GALVANIZED STEEL SHEET |
摘要 |
A method for manufacturing a high strength galvanized steel sheet and a high strength galvanized steel sheet are provided. A base steel sheet having a chemical composition comprising C: 0.03% to 0.35%, Si: 0.01% to 0.50%, Mn: 3.6% to 8.0%, Al: 0.001% to 1.000%, P≦0.10%, S≦0.010%, and the balance comprising Fe and incidental impurities, on a percent by mass basis, is subjected to annealing and galvanization treatment, wherein the maximum steel sheet temperature in an annealing furnace is 600° C. or higher and 700° C. or lower, the steel sheet transit time in a temperature region of the maximum steel sheet temperature of 600° C. or higher and 700° C. or lower is specified to be 30 seconds or more and 10 minutes or less, and the dew point in an atmosphere is specified to be −45° C. or lower. |
申请公布号 |
US2015044503(A1) |
申请公布日期 |
2015.02.12 |
申请号 |
US201314384298 |
申请日期 |
2013.03.07 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
Fushiwaki Yusuke;Kawasaki Yoshiyasu;Nagataki Yasunobu |
分类号 |
C21D9/46;C21D1/26;C23C2/06;C22C38/38;C22C38/06;C22C38/02;C22C38/00;C22C38/16;C22C38/14;C22C38/12;C22C38/08;C23C2/28;C23C2/36;C23F17/00;C21D6/00 |
主分类号 |
C21D9/46 |
代理机构 |
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代理人 |
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主权项 |
1. A method for manufacturing a high strength galvanized steel sheet having a zinc coating layer with an amount of deposition of coating of 20 to 120 g/m2 per one surface on the surface of a base steel sheet having a chemical composition comprising C, 0.03% to 0.35%, Si: 0.01% to 0.50%, Mn: 3.6% to 8.0%, Al: 0.001% to 1.000%, P≦0.10%, S≦0.010%, and the balance comprising Fe and incidental impurities, on a percent by mass basis, the method comprising the step of subjecting the base steel sheet to annealing and galvanization treatment in a continuous galvanizing line, wherein:
the maximum steel sheet temperature in an annealing furnace is 600° C. or higher and 700° C. or lower, and the steel sheet transit time in a temperature region of the maximum steel sheet temperature of 600° C. or higher and 700° C. or lower is specified to be 30 seconds or more and 10 minutes or less, and the dew point in an atmosphere is specified to be −45° C. or lower. |
地址 |
Chiyoda-ku, Tokyo JP |