NI-BASED ALLOY WELDED STRUCTURE AND HEAT EXCHANGER HAVING HIGH-TEMPERATURE CORROSION RESISTANCE

摘要

Corrosion and Si- exhibits high corrosion resistance in an environment of high-temperature corrosion between the Ni-based alloy weld and increase the high-temperature corrosion resistance in the vicinity, and provides high temperature corrosion welding Ni-based alloy structure within the available long-term under high temperature corrosive environments. ; Ni: 45 to 57wt%, Cr: 23 to 35wt%, Mo: 1 to 5wt%, Si: 3 to 6wt%, C: contains 0.05 to 0.5wt%, and the balance of Fe and Ni-based alloy as the high temperature corrosion within the welding structure between the plurality of elements within the high temperature corrosion member formed by a Ni-based alloy consisting of unavoidable impurities and Si- weld joint is formed, wherein the welding welds the welding metal, and some of the Si - the first high-temperature corrosion Ni-based alloy weld metal toughness is higher than (WM1), and the rest is in the high-temperature corrosion Si- second deposition of Ni-based alloys with the same composition, metal (WM2), exposure to high temperature corrosive atmosphere the second metal being deposited on the surface (WM2) is characterized in that the exposed.