Nickel-base superalloy welding wire for 700 DEG C-above ultra-supercritical coal power generation equipment

Abstract

The invention discloses a nickel-base superalloy welding wire for 700 DEG C-above ultra-supercritical coal power generation equipment, and belongs to the technical field of nickel-base superalloys. The nickel-base superalloy welding wire comprises the following chemical components: 0.005-0.08 wt% of C, 22-25 wt% of Cr, 12-22 wt% of Co, 0.5-2.0 wt% of Ti, 1.0-2.5 wt% of Al, 0.5-2.0 wt% of Nb, 0.5-4.5 wt% of Mo, 0.1-3.0 wt% of W, 0.01-0.3 wt% of V, 0.001-0.05 wt% of Zr, no more than 0.02 wt% of Mg, 0.001-0.006 wt% of B, no more than 1.5 wt% of Fe, and the balance Ni and inevitable impurity elements. As such elements as Co, Cr, Mo, W, Al, Ti and Nb and proper amounts of other microelements are added in a nickel-base alloy, the cold / hot machinability, the high-temperature strength and in particular the high-temperature durability of the alloy welding wire are all improved. The alloy welding wire is better in high-temperature strength and durability, and is more excellent in welding process performance; and in the welding process, a molten pool is better in fluidity, and the welding line formability is excellent.

Description

technical field [0001] The invention belongs to the technical field of nickel-based high-temperature alloys, and in particular relates to a nickel-based high-temperature alloy welding wire for ultra-supercritical coal-fired power generation equipment above 700°C, which is suitable for welding and manufacturing advanced ultra-supercritical coal-fired power generation equipment with a steam temperature above 700°C. Background technique [0002] The material involved in the invention is a novel nickel-based superalloy welding wire used for manufacturing ultra-supercritical coal-fired power generation equipment above 700°C. [0003] Energy and environmental issues have always been hot spots and difficulties in the process of world economic development, and have also become the main restrictive factors for the sustainable development of countries in the world today. At present, coal-fired thermal power generation occupies a dominant position in most countries, and it will not cha...

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Problems solved by technology

However, the alloy welding wire invented by this patent is used for welding, and it is found that the grain boundary in the weld structure is prone to γ' depletion zone, and then the aging strengthening effect is reduced, and because there is no solid solution strengthening element, the performance of the welded joint is greatly affected. influences

At the same time, the microstructure and performance of Inconel 740H joints welded with existing Nimonic 263, Haynes 282 and CCA617 welding wires cannot meet the requirements of ultra-supercritical coal-fired power generation equipment above 700 °C

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