...Abstract Weld overlay has been successfully used to mitigate high temperature corrosion issues in coal-fired boilers since the1990s, such as in waterwall and superheater/reheater area. Weld overlay is typically applied in shop or field by using Gas Metal Arc Welding (GMAW) process for boiler...

...Abstract In this paper, a detailed analysis was performed to define the variance between both Nickel alloys 825 and 625 Multi-alloys. A comprehensive experiment and testing was done to evaluate both mechanical and chemical properties for the flanges with weld overlay, fittings and pipe components...

...Abstract Weld overlay of the UNS K1157 (ASME SA213-T11) boiler tubes is required in coal fired boilers operating in a low-NO_x combustion mode to prevent excessive corrosion of the pressure tubes. When retrofitting boilers to a low-NO_x combustion mode (to reduce emissions...

... and wear. Hardfacing alloys that can be applied to the components as weld overlay are needed for extending the service life of those boiler components. The present paper discusses two new hardfacing alloys based on Fe-Cr-C alloy system that have been recently developed for use as weld overlay against...

... wt%. Four weld overlays (with 5, 12, 24 and 36%Fe) were selected for further testing using methods (iv) and (v). Test specimens were extracted from the weld deposits. Depending on the test methods, specimens were prepared with and/or without the base metal. For polarisation curves and CPTs...

..., a CO₂ partial pressure (pCO₂) of 28 bara, a total pressure of 53 bara and a temperature of 177°C. This is an environment to which wrought Alloy 625 ⁸ has been shown to be resistant. Four weld overlays (with 5, 12, 24 and 36%Fe, respectively) were selected for SCC testing. The test...

...Weld overlay Ni-base alloys Sulfuric Acid Corrosion INTRODUCTION Corrosion-resistant claddings and weld overlays have been widely used in petroleum refining and pulp and paper industries for protection of processing equipment. ^{1 - 5} Applications of corrosion-resistant claddings...

... that the nickel phase in the coating is vulnerable to corrosion by both weak acids. This is circumstantial evidence that acid condensation in the refining zone is possible. Based on the test reported here, the two weld overlays tested are promising candidates for wear sleeve service in hardwood high-yield pulping...

... attack under low NO_x combustion conditions. The early trials and adoption of weld overlays of chromia-forming alloys by the industry in mid- and late-1990s showed surprising successes in eliminating the tube wastage issue for the waterwalls. However, with longer services under the low...

...Abstract Sulfidation has been a frequently encountered high-temperature corrosion issue in petroleum refinery processing. Corrosion-resistant claddings and weld overlays have been widely used to provide protection of refinery equipments against sulfidation attack. Current study examines...

... and platelets welded to steel substrates in corrosion-susceptible areas NiCrMo alloys applied by thermal spraying (high velocity arc spraying) Solid corrosion resistant alloys in selected areas cladding duplex stainless steel geothermal stress corrosion cracking thermal spray weld overlay STRUCTURING...

... or Cr-Mo steel waterwall tubes is the application of sulfidation-resistant weld overlay claddings. For some supercritical units, corrosion attack can take the form of preferential sulfidation penetration which could lead to circumferential cracking in waterwall tubes. Superheaters and reheaters, which...

...Abstract 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...

...INTRODUCTION Cracking of weld overlay in ring grooves as well as solid SS ring grooves itself, is a common problem in refining industry. This problem is more critical when it involves major equipment such as hydro-desulphurization reactors and high pressure piping. The flanges of reactor nozzles...

... generated for materials designed to resist the rigors of high temperature corrosion in coal fired boilers. These results and experiences will be discussed, with particular emphasis upon weld overlay materials. Physical and mechanical properties which enhance the performance of such materials in boiler...

... that can range from marine splash zone to down-hole sour environments. The fabrication of these HCRAs metallic coatings typically involves coating low grade carbon steels with one or different layers of the HCRAs using techniques such as thermal spray coating, chemical vapor deposition, weld overlay...

...The alloy chemistries of the materials discussed in this paper are summarized in Table 1 . While the main application of these alloys is as a weld overlay material, the undiluted wire chemistries are shown in Table 1 , as the amount of dilution that will occur during application of a weld overlay...

...ethylene pyrolysis furnace tubes carburization tube life catalytic coke chromium oxide run length conversion Plasma Powder Welding weld overlay INTRODUCTION Ethylene pyrolysis furnace tubes are typically constructed of Fe-Ni-Cr centricast alloys, such as HK40, HP-mod, or HP micro alloys...

... with alloy 625 which was present in every test panel. It was observed that all the weld overlay test sections behaved similar to machined alloy 625 in that there was general corrosion and pitting corrosion. In addition, alloy 622 also exhibited preferential corrosion with respect to its dendrite structure...

... stainless steels (such as 304H). Two new materials have been tested in the laboratory to evaluate their resistance to coal ash corrosion: Alloy 33 (UNS R 20033) and Alloy 45TM (UNS N 06045). Alloy 33 can be applied as a protective weld overlay and Alloy 45TM can be used as a solid tube material. Both...