Boiler tube

Details Boiler tube Boiler tube

1984-03-27

1985-03-19

Favors, Edward G.

Liquid heaters and vaporizers

Tubes and connections

75128A, 122DIG13, 138143, 165180, 165DIG8, 428683, F22B 3706

Patent

active

045052328

ABSTRACT:
A boiler tube having a double-tube structure constituted by an inner tube and an outer tube integrated with each other. The inner tube is made of an alloy consisting essentially of, by weight, 0.02 to 0.15% of C, 0.5 to 3.5% of Si, not greater than 2% of Mn, 25 to 40% of Ni, 20.5 to 27% of Cr, 0.5 to 3% of Mo, not greater than 1% of Nb and the balance Fe and having a substantially fully austenite structure. The outer tube is made of an alloy consisting essentially of, by weight, 0.02 to 0.2% of C, not greater than 3.5% of Si, not greater than 2% of Mn, 33 to 45% of Ni, 30 to 40% of Cr and the balance Fe and having a substantially fully austenite structure. The inner tube made of the alloy having the composition specified above exhibits a high resistance to steam oxidation without any reduction in high-temperature strength even at elevated steam temperature, while the outer tube made of the alloy having the composition specified above exhibits a superior resistance to corrosion by coal combustion gas.

REFERENCES:
patent: 3366473 (1968-01-01), Nehrenberg et al.
patent: 3856516 (1974-12-01), English
patent: 3859082 (1975-01-01), Denhard, Jr. et al.
patent: 3969153 (1976-07-01), Suzuki et al.
patent: 4026699 (1977-05-01), Eiselstein et al.
patent: 4054174 (1977-10-01), Haller
patent: 4346739 (1982-08-01), Asada
patent: 4463061 (1984-07-01), Otoguro et al.

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