Welding wire for 630 DEG C ultra-supercritical G115 heat-resistant steel, preparation method and GTAW using method

Abstract

The invention provides a welding wire for 630 DEG C ultra-supercritical G115 heat-resistant steel, a preparation method of the welding wire and a GTAW using method, and belongs to the field of welding materials. The welding wire comprises the following chemical components in percentage by weight: 0.07 to 0.13 percent of C, 8.60 to 9.20 percent of Cr, 0.10 to 0.40 percent of Ni, 0.30 to 0.60 percent of Mn, 2.80 to 3.20 percent of Co, 2.50 to 2.79 percent of W, 0.025 to 0.040 percent of Nb, 0.002 to 0.006 percent of N, 0.16 to 0.25 percent of V, 0.006 to 0.012 percent of B, less than or equal to 0.20 percent of Si, less than or equal to 0.006 percent of P, less than or equal to 0.0010 percent of S, less than or equal to 0.0010 percent of O and the balance of Fe and inevitable impurity elements. The welding wire has the advantages that the welding wire is good in welding process and forming performance, a welding joint and a heat affected zone of the welding wire are free of cracks, the impact property and the high-temperature mechanical property are excellent, the yield strength at the high temperature of 650 DEG C is larger than or equal to 275 MPa, and the room-temperature impact is larger than or equal to 190 J. The material is reasonable in component configuration, advanced in preparation process and high in GTAW welding process operability, and the development requirements of the 630-DEG C ultra-supercritical power station can be met and the performance of the power station equipment material can be improved under the combined action of the three parts.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to an iron-based alloy welding wire for ultra-supercritical heat-resistant steel, which is mainly used for welding the same type of steel for main equipment steam pipes used in 630°C ultra-supercritical power stations. Background technique [0002] At this stage, China's energy structure model is still dominated by thermal power generation, and the proposal of China's dual carbon targets puts forward higher requirements for the efficiency of coal-fired power generation. At present, my country has approved the construction of a 630°C ultra-supercritical power generation demonstration unit. The main steam pipe material is G115 heat-resistant steel jointly produced by the Iron and Steel Research Institute and Baosteel. The welding wire products, welding process and post-weld heat treatment process that match the G115 heat-resistant steel main steam pipeline are also in the ...

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Problems solved by technology

[0005] According to literature research and welding experiment research, at this stage, the main problems in the welding of G115 heat-resistant steel include the following aspects: 1) micro-cracks are prone to appear in the weld zone, fusion zone and heat-affected zone of the welded joint, and the W element in the crack is partial The aggregation phenomenon is obvious, and there are inclusions; 2) The post-weld heat treatment process range is large and the temperature is high, which is not conducive to the implementation of the production site; 3) After welding heat treatment, the high-temperature mechanical properties of the welded joint are low, and the impact toughness value of the welded joint is low , poor stability

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