STEEL ALLOY FOR FERRITIC STEEL HAVING EXCELLENT CREEP STRENGTH AND OXIDATION RESISTANCE AT ELEVATED USAGE TEMPERATURES

摘要

It is at service temperatures ferritic steel alloy the present invention relates to one kind, with excellent creep strength and corrosion resistance, especially when using temperature≤750C, there is following chemical component (weight %): C≤1.0%; Si≤1.0%; Mn≤1.0%; P maximum values are 0.0%; 5%; Maximum value 0. 01%; 2≤Al≤12%; 3≤Cr16%; 2≤Ni≤10% and/or 2≤CO≤10%, wherein 2≤NI+Co≤[%Cr]+2,07x[%Al]=0.95x([%Ni]+[%Co]); N maximum values are 0. 0200%; Remaining produces the iron of related impurities for steely, optionally adds one or more elements of V, Ti, Ta, Zr and Nb, optionally adds one or two kinds of elements of molybdenum and W, optionally adds one or more elements of Hf, B, Se, Y, Te, Sb, La and Zr. Cumulative level range L T.LT.LT 0. 1%, condition is that steel construction includes the equally distributed relevant precipitation based on ordered phase between stable (Ni, Co) the Al-B2 metals of chromium.