HEAT RESISTANT ALLOY HAVING SUPERIOR CORROSION RESISTANCE IN HIGHLY OXIDIZING AND SULFURIZING CORROSIVE ATMOSPHERE

摘要

PURPOSE:To provide superior corrosion resistance in a highly oxidizing and sulfurizing corrosive atmosphere to a heat resistant alloy consisting of specified percentages of C, Cr, Ni, Co and Fe by forming a single-phase structure having a face-centered cubic structure and by specifying the surface hardness. CONSTITUTION:The composition of a heat resistant alloy is composed of =0.1wt% C, 22-45wt% Cr, 18-70wt% Ni+Co and the balance Fe with inevitable impurities, and a single-phase structure having a face-centered cubic structure is formed. The surface hardness of the alloy is regulated to =350 Vickers hardness under 100g load by cold working. The heat resistant alloy having superior corrosion resistance in the highly oxidizing and sulfurizing corrosive atmosphere under =about 10-10atm. partial pressure of oxygen and =about 10-8atm. partial pressure of sulfur is obtd.