Steel plate, hot-dip galvanized high strength with low reason of income, hot galvanized steel sheet and high strength with low recozida reason of income, method for the production of hot galvanized steel sheet of high strength with low reason of rendime NT.And method for the production of hot galvanized steel sheet and high strength recozida with low income.

摘要

Steel plate, hot-dip galvanized high strength with low reason of income, hot galvanized steel sheet and high strength with low recozida reason of income, method for the production of hot galvanized steel sheet of high strength with low reason of rendime NT.And method for the production of hot galvanized steel sheet and high strength recozida with low income.The present invention relates to a steel sheet, hot galvanized high strength with low ratio of income includes such as chemical composition, in weight percent, 0.03% to 0.20% C, 1.0% or less Si, more than 1.5% to 3.0% Mn, 0.10% or less P, 0.05% or less s, 0.10% or less. Al, 10% or less of N, 0.5% or less Cr and 0.01% to 0.50% of Mo,And balancing with Fe with inevitable impurities, and also includes a structure including a ferrite and a second phase. The ferrite has a proportion of the area of 50% or more, and the second phase includes martensita whose proportion of the area is in the range from 7% to less than 25%. The thickness of a structure type band formed by the second phase meets the predetermined euqau00e7u00e3o.