Precipitation strengthened ferritic heat resistant steel, turbine high temperature member using the heat resistant steel, and turbine using the turbine high temperature member

摘要

PROBLEM TO BE SOLVED: To provide precipitation strengthening type ferritic heat resistant steel having balance of mechanical strength and oxidation resistance at high temperature at a higher level than conventional one, a turbine high temperature member using the heat resistant steel and a turbine using the turbine high temperature member.SOLUTION: The precipitation strengthening type ferritic heat resistant steel contains 0.1 mass% or less of C, 12 mass% to 20 mass% of Cr, 2 mass% to 6 mass% of Ni, 2 mass% to 8 mass% of Al, 2.5 mass% to 10 mass% of W, 0.5 mass% to 2.5 mass% of Mo, 2 mass% to 6 mass% of Co, 0.001 mass% to 0.01 mass% of B and the balance Fe with inevitable impurities.