High strength, hot dip coated, dual phase, steel sheet and method of manufacturing same

摘要

A galvanized steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: carbon in a range from about 0.01% to about 0.18%; manganese in a range from about 0.2% to about 3%; silicon <= about 1.2%; aluminum in a range from about 0.01% to about 0.1%; one or both of chromium and nickel in a range from about 0.1% to about 3.5%; calcium in a range from about 0.0003% to about 0.01%; phosphorus <= about 0.01%; sulfur <= about 0.03%; nitrogen <= about 0.02%; molybdenum <= about 1%; copper <= about 0.8%; one or more of niobium, titanium, and vanadium <= about 1%; and boron <= about 0.006% by weight; and with the balance of the composition being iron and incidental ingredients. In one embodiment, the steel sheet is both galvanized and galvannealed.