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51312-01440-A HIGH CHROMIUM ALLOY FOR WELD OVERLAY OF SUPERHEATERS IN COAL FIRED POWER PLANTS

Picture for A HIGH CHROMIUM ALLOY FOR WELD OVERLAY OF SUPERHEATERS IN COAL FIRED POWER PLANTS
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Product Number: 51312-01440-SG
ISBN: 01440 2012 CP
Author: Larry D. Paul
Publication Date: 2012
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UNS R20033 is produced as a welding consumable and is covered under AWS A.9 under the designation of ER33-31. This material is now being widely used as weld overlay material in the fossil boiler industry. The high chromium content of ER33-31 has been shown to provide excellent corrosion protection in both waterwall and superheater/reheater tube applications. However the main interest has been for use in convection pass tubes (i.e. superheater and reheater tubes). ER33-31 is applied to pressure tubing using a spiral clad weld overlay and is able to provide excellent resistance coal ash corrosion. Laboratory and field tests have shown ER33-31 to have among the best corrosion resistance of all materials studied. The application of ER33-31 is also easier than other more highly alloyed materials (such as FM-72) and is less expensive. A review of the favorable experiencesof ER33-31 and the conditions under which ER33-31 should be considered are reviewed in this paper.
UNS R20033 is produced as a welding consumable and is covered under AWS A.9 under the designation of ER33-31. This material is now being widely used as weld overlay material in the fossil boiler industry. The high chromium content of ER33-31 has been shown to provide excellent corrosion protection in both waterwall and superheater/reheater tube applications. However the main interest has been for use in convection pass tubes (i.e. superheater and reheater tubes). ER33-31 is applied to pressure tubing using a spiral clad weld overlay and is able to provide excellent resistance coal ash corrosion. Laboratory and field tests have shown ER33-31 to have among the best corrosion resistance of all materials studied. The application of ER33-31 is also easier than other more highly alloyed materials (such as FM-72) and is less expensive. A review of the favorable experiencesof ER33-31 and the conditions under which ER33-31 should be considered are reviewed in this paper.
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