New composite tube finds success in refuse incineration

Citation

(1998), "New composite tube finds success in refuse incineration", Anti-Corrosion Methods and Materials, Vol. 45 No. 5. https://doi.org/10.1108/acmm.1998.12845ead.010

New composite tube finds success in refuse incineration

New composite tube finds success in refuse incineration

Keywords Corrosion resistance, Sandvik, Steel

Swedish steelmaker AB Sandvik Steel has announced the development of new composite tubes designed to maximise corrosion resistance in waterwalls, evaporators and superheaters in waste incineration boilers (Plate 1).

Plate 1 A tube wall in an incineration plant

Stainless steel grades Sandvik Sanicro 63 and 65 have been developed for use as the outer layer of a composite tube providing corrosion protection for an inner load carrying component made from a low alloy ferritic steel such as ST 45.8 (ASTM A 210A1) or 10CrMo910 (ASTM A 213 T22). The inner and outer components are metallurgically bonded together in the manufacturing process and subjected to 100 per cent ultrasonic examination to prove the bond.

Sandvik claims that Sanicro 63 and 65 composite tubes have the potential for a material life 4-8 times longer than the low alloyed ferritic steels which are commonly used in the construction of waste incineration superheaters.

Developed following extensive on-site testing, one of the new composite tubes has reportedly led to a significant order for a refuse incineration boiler plant in the Netherlands. An order for 4,200 metres of Sanicro 63 composite superheater tubing follows an earlier delivery of 2,500 metres installed in October 1997. Both orders replace carbon steel tubes which in this particular application corroded to failure in about seven months. At a recent inspection after six months operation no metal loss could be measured on the first installation of composite tubes

Sandvik's product manager, waste incineration, Urban Forsberg says, "These orders are the result of a major evaluation of materials for the AVIRA company, based in Duiven in The Netherlands. Tube failure can take up to a week to deal with and every day of downtime is expensive. The new composite tube is expected to reduce the risk of unscheduled stoppages and extend the life of the superheaters considerably."

Further details can be obtained from Sandvik Steel UK. Tel: +44 0121 504 5100; Fax: +44 0121 504 5151; Internet: www.steel.sandvik.com