| 摘要 |
Dual phase steel sheet is made using a time/temperature cycle including a soak at the temperature of about 727?C (1340?F)-775?C(1425?F) and a maturing at 454-493?C (850-920?F), where the steel has the composition in weight percent, carbon: 0,02-0,20; aluminum: 0,010-0,150; titanium: 0,01 max; silicon: 0,5 max; phosphorous: 0,060 max; sulfur: 0,030 max; manganese: 1,5-2,40; chromium: 0,03-1,50; molybdenum: 0,03-1,50; on condition that the amounts of manganese, chromium and molybdenum have the ratio: (Mn+6Cr+10Mo)= at least 3,5%. The sheet in the form of a strip treated in a continuous galvanizing or galvannealing line, and the product of predominantly ferrite and martensite content is obtained.
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