650 ℃第三代超超临界锅炉管候选钢种的化学成分研究现状

doi:10.11896/j.issn.1005-023X.2018.13.005

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Abstract According to the latest statistics, by the end of 2016, 71.60% of total power generation capacity in China was produced by thermal power, 64.04% of the total installed capacity in China was contributed by thermal power. Water power in China accounted less than 20% of total power production; nuclear power, wind power and solar power accounted less than 10%. Apparently, thermal power is the backbone of electrical energy in China. Nevertheless, owing to the increasing appeal for environment protection, the traditional power generation technology with low efficiency, high emission and high pollution can’t meet the healthy and sustainable development of power generation industry. While as a new technology with high efficiency, low emission and low pollution, ultra-supercritical power generation technology has aroused great attention and been widely studied. In engineering thermodynamics, the critical parameters of water is 22.115 MPa and 374.15 ℃. Above this parameter, water presents single-phase fluid which is called super critical state. Super critical generator is thermal power generator which serves under the condition of above 22.115 MPa and 374.15 ℃. There is no specific parameter in physics for ultra-supercri-tical state, and there is also no unified definition for ultra-supercritical generator. It is universally recognized the generator can be called ultra-super critical generator when it served under the steam pressure of above 27 MPa or the steam temperature of above 580 ℃. 650 ℃ ultra-supercri-tical technology is an advanced coal-fired power generation technology which has been competitively studied worldwide. The working condition are steam temperature of 650 ℃ and pressure of 35 MPa. The core technology of 650 ℃ ultra-supercritical power generator is the steel used for main steam boiler tube, which is required to suffer the 650 ℃, 35 MPa steam. The researches of this kind of steel mainly focus on the chemical component design. Up to now, Japan and China has developed their own chemical component system and produced their original steel independently. The steel deve-loped by National Institute for Materials Science of Japan is named MARBN(9Cr-3W-3CoVNbBN), the steel developed by Nippon Steel & Sumitomo Metal Corporation is named SAVE12AD(9Cr-3W-3CoNdVNbBN), and the steel developed by Iron and Steel Research Institute is named G115(9Cr-2.8W-3CoCuVNbBN). However, the processing property and working perfor-mance of the three kinds of steels are still under experimental evaluation, and the matched welding material and welding technique are in development as well. Currently, there are several candidate steels with different chemical components for 650 ℃ ultra-supercritical boiler tube. Different developers have different understandings of the effects caused by various elements, and there is no consensus yet on the best chemical components. The research progress in chemical components of the candidate steel used for 650 ℃ ultra-supercritical boiler tube is summarized in this article. The action mechanisms of chemical elements such as B, N, C, W, Ta, Nd, Co are analyzed, and the effects of the elements on the matrix structure, carbides, creep property and so forth are elaborated. In view of welding property, it is pointed out that the chemical component of the welding materials should be matched with the tube steel, the welding property degeneration should be avoided. The problems which should be paid attention to during welding materials development are clarified.

Key words： 650 ℃ ultra-supercritical boiler tube chemical component welding property welding materials development

Published: 01 August 2018

CLC number:

TG142.1

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	WEN Xinli
	ZHANG Qingquan
	CHEN Lie

Cite this article:

WEN Xinli,ZHANG Qingquan,CHEN Lie. A State-of-the-art Review of Chemical Component Study of theCandidate Steel for 650 ℃ Ultra-supercritical Boiler Tube[J]. Materials Reports, 2018, 32(13): 2167-2175.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.13.005 OR http://www.mater-rep.com/EN/Y2018/V32/I13/2167

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