| 摘要 |
PROBLEM TO BE SOLVED: To prevent a build-up on a roll surface with the use of a means simpler than the conventional means by reducing the quantity of oxide shifting from a high strength steel sheet surface to a roll surface and inducing the build-up when the high strength steel sheet passes through a furnace for annealing. SOLUTION: When the high strength steel sheet or a high strength plated steel sheet is produced by applying a recrystallize-annealing to the steel sheet containing, by mass%, 0.4-2.5% Si and 0.2-2.0% Mn, before heating the above steel sheet to the annealing temperature, an inner part oxidize-treatment is applied to the steel sheet under condition of 350-550°C in the heating temperature range for 3 min to <10 min staying time in the above temperature range and 0.002-0.6 PH<SB>2</SB>O/PH<SB>2</SB>ratio of the partial pressure of moisture and the partial pressure of hydrogen in the heating atmosphere. COPYRIGHT: (C)2008,JPO&INPIT
|
