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

摘要

A ferritic stainless steel sheet of a composition, expressed in weight percentages: trace amounts≦̸C≦̸0.03%; 0.2%≦̸Mn≦̸1%; 0.2%≦̸Si≦̸1%; trace amounts≦̸S≦̸0.01%; trace amounts≦̸P≦̸0.04%; 15%≦̸Cr≦̸22%; trace amounts≦̸Ni≦̸0.5%; trace amounts≦̸Mo≦̸2%; trace amounts≦̸Cu≦̸0.5%; 0.160%≦̸Ti≦̸1%; 0.02%≦̸Al≦̸1%; 0.2%≦̸Nb≦̸1%; trace amounts≦̸V≦̸0.2%; 0.009%≦̸N≦̸0.03%; trace amounts≦̸Co≦̸0.2%; trace amounts≦̸Sn≦̸0.05%; rare earths (REE)≦̸0.1%; trace amounts≦̸Zr≦̸0.01%; the remainder of the composition consisting of iron and of inevitable impurities resulting from the elaboration; the Al and rare earth (REE) contents satisfying the relationship: Al+30×REE≧0.15%; the Nb, C, N and Ti contents in % satisfy the relationship: 1/[Nb+(7/4)×Ti−7×(C+N)]≦̸3; said metal sheet having an entirely recrystallized structure and an average ferritic grain size comprised between 25 and 65 μm. A method for manufacturing such a ferritic stainless steel sheet, and its use for manufacturing parts involving shaping and welding and intended to be subject to a periodic temperature of use comprised between 150° C. and 700° C. and to a projection of a mixture of water, urea and ammonia.