HEAT-RESISTANT ALLOY AND REACTION TUBE

Japanese Patent JP2019085643

A

To provide a heat-resistant alloy and a reaction tube having excellent oxidation resistance, excellent mechanical properties such as tensile ductility, and excellent weldability.SOLUTION: A heat-resistant alloy contains, by mass%, C: 0.35%-0.7%, Si: more than 0% and 1.5% or less, Mn: more than 0% and 2.0% or less, Cr: 22.0%-40.0%, Ni: 25.0%-48.3%, Al: 1.5%-4.5%, Ti: 0.01%-0.6%, with the balance being Fe and inevitable impurities; with Pa=-11.1+28.1×C+29.2×Si-0.25×Ni-45.6×Ti and Ya=-13.75×Al+63.75, Pa