Discussion: “Metallurgical Evaluation of Superheater Tube Alloys After 12 and 18 Months’ Exposure to Steam at 1200, 1350, and 1500 F” (Clark, C. L., Rutherford, J. J. B., Wilder, A. B., and Cordovi, M. A., 1962, ASME J. Eng. Power, 84, pp. 258–287) and “Scaling Behavior of Superheater Tube Alloys in ASME High Temperature Steam Research Tests at 1100–1500 F” (Eberle, F., and Anderson, C. H., 1962, ASME J. Eng. Power, 84, pp. 223–257)

The scales formed on seven ferritic and ten austenitic types of commercial tubing presently in use and of potential future use for superheater service were examined after 6, 12, and 18 months’ exposure to air and to flowing steam of 2000 psi at temperatures of 1100, 1200, 1350, and 1500 F. The effect of temperature and time of exposure on the adherence, thermal-shock resistance, thickness, structure, and chemical composition of the scales was investigated and the relative resistance to scaling of the various alloys evaluated.

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Closure to “Discussion of ‘Scaling Behavior of Superheater Tube Alloys in ASME High Temperature Steam Research Tests at 1100–1500 F’” (1962, ASME J. Eng. Power, 84, pp. 256–257)

Journal of Engineering for Power ◽

10.1115/1.3675014 ◽

1962 ◽

Vol 84 (3) ◽

pp. 257-257

Author(s):

F. Eberle ◽

C. H. Anderson

Keyword(s):

High Temperature ◽

Scaling Behavior ◽

Superheater Tube ◽

High Temperature Steam

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Discussion: “Scaling Behavior of Superheater Tube Alloys in ASME High Temperature Steam Research Tests at 1100–1500 F” (Eberle, F., and Anderson, C. H., 1962, ASME J. Eng. Power, 84, pp. 223–257)

Journal of Engineering for Power ◽

10.1115/1.3675013 ◽

1962 ◽

Vol 84 (3) ◽

pp. 256-257

Author(s):

R. E. Chappell

Keyword(s):

High Temperature ◽

Scaling Behavior ◽

Superheater Tube ◽

High Temperature Steam

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The Effect of Corrosion by Steam at 1100–1500 F Upon the Heat Transfer Through Superheater Tube Alloys

Journal of Engineering for Power ◽

10.1115/1.3675019 ◽

1962 ◽

Vol 84 (3) ◽

pp. 289-294 ◽

Cited By ~ 1

Author(s):

H. L. Solberg ◽

J. E. Brock ◽

W. J. Rebello

Keyword(s):

Heat Transfer ◽

High Temperature ◽

Heat Exchangers ◽

Superheater Tube ◽

Austenitic Alloys ◽

Inner Surface ◽

In Series ◽

High Temperature Steam ◽

Tubular Specimens

Heat-transfer tests were made on tubular specimens of ferritic and austenitic types of superheater alloys which had been exposed to high-temperature steam for periods of 6, 12, or 18 months for the purpose of determining the effect of corrosion by steam. Specimens of scaled tubes and new tubes of the same alloy were machined externally to the same dimensions and surfaces, were mounted in similar heat exchangers, and were tested in series under such conditions that the only difference was in the scaled inner surface of the corroded tube and the bright, smooth, honed inner surface of the clean tube. The heat transfer through ferritic tubes was reduced by as much as fifteen per cent for the temperatures and exposure periods reported upon. The thin, dense scale on the austenitic alloys increased the heat transfer over that of the clean tube by as much as eight per cent, probably because of the increased roughness of the corroded surface.

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