Cr HIGH CHROMIUM FERRITIC STAINLESS STEEL EXCELLENT IN PICKLING PROPERTY AND ITS PICKLING METHOD

摘要

Disclosed is a ferritic stainless steel and a pickling method thereof, by which the Mn oxide thickness and the internal Si oxide thickness of the surface layer scale of Si and Nb-added high Cr ferritic stainless steel can be adjusted to ensure easy pickling. High Cr ferritic stainless steel having excellent pickling properties according to an embodiment of the present invention, in weight%, C: 0.02% or less, Si: 0.3 to 0.6%, Mn: 0.1 to 0.5%, P: 0.03% or less, S: 0.005% or less, Cr: 17.0-26.0%, Ni: 0.6% or less, Nb: 0.1-0.6%, Sn: 0.1% or less, N: 0.05% or less, remaining Fe and unavoidable impurities, and the following formula ( 1) is satisfied. (1) 0.115 ≤ 0.123-0.0108 * Sn + 0.0151 * Si-0.0147 * Mn + 0.0089 * Ni-0.0105 * Sn * Si ≤ 0.130