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Shu X.-Y.,Zhejiang University | Zheng J.-Y.,Zhejiang University | Shou B.-N.,China Standardization Committee on Boilers and Pressure Vessels | Miao C.-J.,Zhejiang University | And 2 more authors.
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2012

The influence of 9% cold stretching on impact behavior of welding joints was investigated to provide the basis for establishment of eligible criteria on impact tests for austenitic stainless steel welding joints after cold stretching. Charpy V-notched impact tests of S30408 stainless steel welding joints in welds and HAZs before and after 9% cold stretching with two sizes of specimens (standard specimens and 5 mm sub-sized specimens) were conducted at -196°C. Experimental results showed no statistically significant difference between test groups before and after cold stretching. Meanwhile, linear relations between Charpy impact energy (K V) and lateral expansion (L E) with two specimen sizes were confirmed. No statistically significant difference was found in linear relations between test groups before and after cold stretching. When K V meets the requirement of standards and specifications, L E also satisfies the requirements, except for standard specimens from welds. Relations of standard and sub-sized specimens Charpy impact energy were also discussed. Before and after cold stretching, the ratio of energy absorbed in sub-sized specimens to that in standard specimens is greater than 0.5 for welds, and equals to 0.5 for HAZs. Source


Yang G.-Y.,China Standardization Committee on Boilers and Pressure Vessels | Chen Z.-W.,China Standardization Committee on Boilers and Pressure Vessels | Shi J.-Q.,Lanpec Technologies Limited
Petrochemical Equipment | Year: 2010

Based on the finite element analysis of temperature field and stress calculating induced by temperature difference, this paper presents the stress analysis results of tubesheet heat exchanger which tubes are arranged in only local area of tubesheet under temperature load and inner pressure load. Source


Chen Z.,Beijing University of Chemical Technology | Qian C.,Beijing University of Chemical Technology | Yang G.,China Standardization Committee on Boilers and Pressure Vessels | Li X.,China Special Equipment Inspection And Research Institute
Journal of Pressure Vessel Technology, Transactions of the ASME | Year: 2016

In this paper, a series of impact tests on S30403 austenitic stainless steel at 20/-196/-269 °C were performed to determine the effects of cryogenic temperatures on the material properties. Both base plate and welded joint including weld and heat-affected zone were tested to obtain the Charpy impact energy KV2 and lateral expansion rate at the cross section. It was found that when the test temperature decreased from 20 °C to -196 °C or -269 °C, both the Charpy impact energy KV2 at the base plate and welded joint decreased drastically. Specifically, the impact energy KV2 decreased by 20% at the base plate and decreased by 54% at the welded joint from 20 °C to -196 °C, but the impact energy of base plate and welded joint did not decrease, even increased when test temperature decreased from -196 °C to -269 °C. Either at 20 °C or -196 °C, the impact energy KV2 with 5 × 10 × 55 mm3 specimens was about 0.53 times that of the 7.5 × 10 × 55 mm3 specimens, much lower than 2/3, the ratio of two specimens' cross section areas. Copyright © 2016 by ASME. Source

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