Boiler tube having improved high temperature mechanical strength

Details Boiler tube having improved high temperature mechanical strength Boiler tube having improved high temperature mechanical strength

1983-06-09

1984-07-31

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428595, 428678, 165180, 138143, B32B 2706

Patent

active

044630611

ABSTRACT:
A boiler tube having improved high temperature strength, improved high temperature corrosion resistance, and resistivity to embrittlement during the service thereof, comprising an outer surface layer and an inner part, the outer surface layer consisting essentially, by weight, of 0.03-0.20% carbon, 1.5-4.0% silicon, 0.1-3.0% manganese, 13-25% chromium, 13-40% nickel, 0.5-3.0% at least one kind selected from the group consisting of molybdenum and tungsten, 0.05-0.5% at least one kind selected from the group consisting of titanium, niobium and vanadium, and the balance iron and inevitable impurities, the inner part consisting essentially, by weight, of 0.03-0.20% carbon, 0.3-1.0% silicon, 0.1-3.0% manganese, 13-25% chromium, 13-40% nickel, 0.5-3.0% at least one kind selected from the group consisting of molybdenum and tungsten, 0.05-0.5% at least one kind selected from the group consisting of titanium, niobium and vanadium, and the balance iron and inevitable impurities. Boron of 0.001-0.01% may be further added to the alloy to improve creep strength while keeping improved high temperature corrosion resistance.

REFERENCES:
patent: 3694271 (1971-06-01), Egnell
patent: 3969153 (1976-07-01), Suzuki et al.
patent: 4075376 (1978-02-01), Jaeger
"Co-Extruded Tubes Improve Resistance to Fuel Ash Corrosion in U.K. Utility Boilers", described by T. Flatly et al., Material Performance, vol. 20, No. 5, 5-81.

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