Cr-ni heat resistant steel

PURPOSE: To provide a Cr-Ni heat resistant steel having high creep rupture strength in high temp. region and excellent in internal oxidation resistance. CONSTITUTION: The Cr-Ni heat resistant steel has a composition consisting of, by weight, 0.2% carbon, ≤0.6% silicon, ≤2.0% manganese, 20-35% chromium, 15-50% nickel, 0.2-2.0% niobium, 0.05-0.70% titanium, 0.05-0.70% zirconium, ≤100ppm nitrogen, and the balance iron with inevitable impurities and containing, if necessary, 0.5-10.0% of tungsten and/or cobalt. COPYRIGHT: (C)1993,JPO&Japio