| 摘要 |
A composite tube with improved resistance to thermal fatigue and stress corrosion for use in soda recovery units comprising an inner tubing of a conventional carbon steel and an outer liner of a Cr-Ni-Mo-Fe-based alloy with austenitic structure which alloy contains, in weight-%, 0.01-0.04 C, 19.5-23.5 Cr, 38-46 Ni, 2.5-3.5 Mo, up to 0.5 Si, up to 0.3N, and the remainder being Fe, except normal impurities.
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