Continuous annealing and hot dip coating method and continuous annealing and hot dip coating system of self-contained steel plates

摘要

B Continuous Recoil and Hot Dip Coating Method and Continuous Recoil and Hot Dip Coating System Containing Si D The present invention relates to a hot dip coating system which has a Si-containing hot dip steel plate annealing furnace, a method and a continuous and hot dip coating annealing system causing internal oxidation without causing oxidation on the Si surface in the steel and preventing a fall steel sheet coating capacity and bonding delay, ie a continuous annealing and hot dip coating method using an annealing furnace having, in that order, a front heating zone, a rear heating zone , a rinse zone, and a cooling zone and a hot-dip coating bath comprising heating or rinsing the steel sheet to a the temperature of the steel sheet in a range of at least 30 ° C or more by indirect heating, making the atmosphere of the zones comprised of hydrogen H: 1 to 10% by volume and the balance being nitrogen and unavoidable impurities, making peak temperature during heating in the front warming zone 550 to 750 198 C and making the dew point less than -25 198 C, making the dew points of the rear warming zones and the rinse zone - 30 198 C to 0 198 C, and making the dew point of the cooling zone less than -25 198 C.