FERRITIC STAINLESS STEEL SHEET, METHOD FOR THE PRODUCTION THEREOF, AND USE OF SAME, ESPECIALLY IN

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The invention relates to a ferritic stainless steel sheet of the following composition expressed in weight percentages : trace ≤ C ≤ 0.03%; 0.2% ≤Mn ≤1%; 0.2 % ≤ Si ≤ 1%; trace ≤ S ≤ 0.01%; trace ≤ P ≤ 0.04%; 15% ≤ Cr ≤ 22%; trace ≤ Ni ≤ 0.5%; trace ≤ Mo ≤ 2%; trace ≤ Cu ≤ 0.5%; 0.160% ≤Ti ≤ 1%; 0.02% ≤ Al ≤ 1%; 0.2% ≤ Nb ≤ 1%; trace ≤ V ≤ 0.2%; 0.009% ≤ N ≤ 0.03%; trace ≤ Co ≤ 0.2%; trace ≤ Sn ≤ 0.05%; rare earths (REE) ≤ 0.1%; trace ≤ Zr ≤ 0.01%; the rest of the composition consisting of iron and inevitable impurities resulting from the processing thereof; the Al and rare earth (REE) contents satisfying the relation : Al + 30 x REE ≥ 0.15%; the Nb, C, N and Ti contents in % satisfying the relation : 1 / [Nb + (7/4) x Ti - 7 x (C + N)] ≤ 3; said sheet having an entirely recrystallised structure and an average ferritic grain size of between 25 and 65 µm. The invention also relates to a method for the production of such a ferritic stainless steel sheet, and to the use thereof for the production of parts involving shaping and welding, that are to be subjected to a periodic use temperature of between 50° C and 700° C and to a projection of a mixture of water, urea and ammonia.