Ferritic stainless steel, compirsing the following composition by weight: 0%<C.ltoreq.0.030% 1%.ltoreq.Si.ltoreq.3% 0%<Mn.ltoreq.0.5% 10%.ltoreq.Cr.ltoreq.13% 0%<Ni.ltoreq.0.5% 0%<Mo.ltoreq.3% N.ltoreq.0.030% Cu.ltoreq.0.5% Ti.ltoreq.0.5% Nb.ltoreq.1% Ca.gtoreq.1 10.sup.-4% O.gtoreq.10 10.sup.-4% S.ltoreq.0.030% P.ltoreq.0.030% the remainder being iron and the impurities which are inevitable from the production of the steel.