CHROMIUM-NICKEL-BASED ALLOY FOR RADIANT TUBE, HAVING EXCELLENT HIGH-TEMPERATURE DEFORMATION RESISTANCE AND CRACK RESISTANCE, AND MANUFACTURING METHOD THEREFOR

摘要

The present invention relates to a Cr-Ni-based alloy for a radiant tube, having excellent resistance to high-temperature deformation and cracks, and a manufacturing method therefor. One embodiment of the present invention provides: a Cr-Ni-based alloy for a radiant tube, having excellent high-temperature deformation resistance and crack resistance, the Cr-Ni-based alloy comprising, by wt%, 0.17-0.3% of carbon (C), 30-35% of chromium (Cr), 45-55% of nickel (Ni), 1% or less of manganese (Mn), 1% or less of silicon (Si), 1-3% of one of niobium (Nb) and vanadium (V) or the sum of the both, 5-18% of tungsten (W), 0.1-1.5% of tantalum (Ta), 0.1-1.5% of hafnium (Hf), 0.001-0.02% of boron (B), 0.05-1.5% of yttrium (Y) and the balance of Fe and other inevitable impurities, and having an average interval between solidified dendrites of 30 μm or less; and a manufacturing method therefor.