A high temperature corrosion resistant stainless steel having a composition (by weight) of: C ≤ 0.2%, but more than zero, N ≤ 0.1 % but more than zero, O ≤ 0.1 % but more than zero, Si ≤ 0.4% but more than zero, Al < 0.5% but more than zero, Mn ≤...