To provide a high-performance, inexpensive low C-high Si-high Cr—B—Nb type iron-based
corrosion-resistant and wear-resistant
alloy that is extremely superior in
corrosion resistance and
wear resistance to 304 stainless steel, high-
chromium cast iron and
high carbon-high
chromium cast-iron-type materials, has a high
corrosion-resistant property that would never be obtained from a
high carbon-high
chromium carbide precipitation-type iron-based wear-resistant
alloy and at the same time, a wear-resistant property that is superior to these metals, and further hardly causes brittle peeling that is inherent to high Si—containing steel. This
alloy contains, all percentages by weight, C: 0.5 to 2.5% by weight, Si: 2.5 to 4.5%, Mn: 0 to 10% or less, Cr: 15% to 31%, Ni: 0 to 16%, Cu: 7% or less, Mo: 10% or less, B: 0.5% to 3.5%, and 0≦Nb+V≦8%, and in this structure, within a range of 15% Cr≦Cr<27%, (Si×B)≦2014 / Cr2+0.083Cr+1.05 is satisfied, within a range of 27%≦Cr≦31%, 1.25%≦(Si×B) 6.0% is satisfied, within a range of 15%≦Cr<20%, (Si×B) 570 / Cr2−0.066Cr+1.145 is satisfied, and within a range of 20%≦Cr≦31%, (Si×B)≧1.25 is satisfied.