Research and Development of Advanced Boiler Steel Tubes and Pipes Used for 600°C USC Power Plants in China

Liu, Z. D.; Cheng, Shen; Bao, H. S.; Yang, Gengwei; Gan, Yong; Xu, S.W.; Wang, Q. J.; Guo, Yang; Tan, Sugata P.

doi:10.1007/978-3-642-17665-4_41

Cited by 2 publications

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“…At present, 600°C ultra-supercritical (USC) power generation technology is widely used in thermal power plants around the world 1 . Thermal power generation meets the needs of people's life and also emits a large amount of CO 2 , SOx, NOx, and other harmful gases, thus causing a great impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Thick 08Cr9W3Co3VNbCuBN Heat-Resistant Steel welded Joint by TIP TIG Welding

et al. 2023

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In this paper, the multi-layer multi-pass welding process was used to weld 115mm 08Cr9W3Co3VNbCuBN (G115) steel pipe, the gas tungsten arc welding (GTAW) was used in root pass welding, subsequent welding by dynamic hot wire gas tungsten arc welding (TIP TIG) welding method, while the post-weld heat treatment (PWHT) of 770°C × 10h was carried out afterward. The microstructure and mechanical properties of different zones of the welded joint were analyzed by OM, SEM, XRD, microhardness and impact tests. The results showed that the ferrite and martensite were observed in the weld metal (WM), the fine-grained heat-affected zone (FGHAZ) and the coarse-grained heat-affected zone (CGHAZ) consisting of prior austenitic grain boundaries (PAGBs) and martensite, and more precipitates including coarse M 23 C 6 carbides with fine MX-type carbonitrides were observed inside the grain boundaries and grains. The hardness distribution patterns along different locations (Cover, Fill, Root) on the welded joint cross-section were the same, from base metal (BM) to WM hardness gradually increased, and WM hardness was the highest. WM impact toughness was worse than HAZ, impact fracture mode was a mixed tough-brittle fracture but biased towards brittle fracture.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Thick 08Cr9W3Co3VNbCuBN Heat-Resistant Steel welded Joint by TIP TIG Welding

et al. 2023

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“…But long time working at high temperature and high pressure will lead to its microstructure transformation and aging which could cause facility failure [4][5]. Compared to TP304H, TP347HFG and other heat resistant austenitic stainless steels, some elements, such as Cu, Nb and N in Super304H, make the formation of precipitation of carbide and intermetallic compounds much more complicated [4][5][6][7][8][9][10][11]. It's significant to research the microstructure transformation of Super304H austenitic stainless steel for supervising the damage level of tubes in service.…”

Section: Introductionmentioning

confidence: 99%

Research on Microstructure Transformation of Super304H Stainless Steel in the Process of Aging at 700

Ni¹,

Li²,

Li³

et al. 2016

Advances in Computer Science Research

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Abstract-To study microstructure transformation of Super304H, the original sample and the samples aging for 500h, 800h, 1500h, 2500h and 3650h at 700℃ were analyzed with OM, SEM, TEM and X-ray diffractometry. The results showed the grain size and the precipitated phases along boundaries increased as aging time prolonged, the area fraction and the amount of precipitated phases increased remarkably, while the type of precipitated phases changed from M 23 C 6 to Cr 23 C 6 and Nb (C,N) as aging time varied from 500h to 3650h. The functional relation between area fraction of precipitated phases and aging time at 700℃ was also given.

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Research and Development of Advanced Boiler Steel Tubes and Pipes Used for 600°C USC Power Plants in China

Cited by 2 publications

References 0 publications

Microstructure and Mechanical Properties of Thick 08Cr9W3Co3VNbCuBN Heat-Resistant Steel welded Joint by TIP TIG Welding

Microstructure and Mechanical Properties of Thick 08Cr9W3Co3VNbCuBN Heat-Resistant Steel welded Joint by TIP TIG Welding

Research on Microstructure Transformation of Super304H Stainless Steel in the Process of Aging at 700

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