▎ 摘　　要

NOVELTY - A radiation tube comprises 5-9 %mass silicon carbide, 2-4 %mass manganese, 0.04 %mass or less sulfur, 0.04 %mass or less phosphorus, 20-25 %mass chromium, 3-7 %mass nickel, 1.5-3 %mass boron, 15-20 %mass graphene, 3-5 %mass rare-earth oxide, and remainder of iron and unavoidable impurities. USE - Radiation tube. ADVANTAGE - The radiation tube has excellent heat resistance and heat conduction performance, and prolongs the service life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a radiant tube casting process.