Patent ID: 6146478
Filing Date: 2000-11-14
Classification: C22F

Abstract:
A heat treatment process for material bodies made of a high-temperature-resistant iron-nickel superalloy including, in weight %, up to 0.025% C, up to 0.12% Si, up to 0.35% Mn, up to 0.002% S, up to 0.015% P, 15 to 18% Cr, 40 to 43% Ni, 0.1 to 0.3% Al, up to 0.1% Ta, 1.5 to 1.8% Ti, up to 0.30% Cu, 2.8 to 3.2% Nb, up to 0.01% B, balance Fe, which comprises the following steps:solution annealing at approximately 965 to 995.degree. C. for 5 to 20 hours, cooling to 300.degree. C. or below, stabilization annealing at approximately 775 to 835.degree. C. for 5 to 100 hours, cooling to 300.degree. C. or below, and precipitation hardening at 715 to 745.degree. C. for 10 to 50 hours and at 595 to 625.degree. C. for 10 to 50 hours.