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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Simple discussion on standards about post-weld heat treatment of 347H pressure pipe for hydrogen production unit Zhang Yucheng, Jia Haomei Heat Treatment of Metals    2023, 48 (1): 270-276.   doi:10.13251/j.issn.0254-6051.2023.01.048 Abstract （54）      PDF （607KB）（36）       Knowledge map    Classification of post-weld heat treatment of the 347H stainless steel was introduced, and the status quo of domestic and foreign standards of post-weld heat treatment for austenitic stainless steels was analyzed. At present, domestic and foreign standards have different provisions on the post-welding heat treatment of the 347H stainless steel pipes. The NB/T 10068—2018 standard proposes that the operating temperature and thickness range should be used as the implementation conditions of post-weld heat treatment of the 347H stainless steel, which provides guidance for the post-welding heat treatment of the 347H pressurized pipe used in hydrogen production plant and has certain reference significance. But some of the provisions of the standard are not perfect, including some problems in ferrite measurement sequence, ferrite content qualified value and ferrite measurement method. So it is suggested to adjust the measurement of ferritic content of weld to before post-weld heat treatment, remove the lower limit of ferrite number of 3 FN after solution and stabilization heat treatment, add the qualified value requirement of ferrite content of E(R)16.8.2 cladding metal, and define the detection method of ferrite content. At the same time, the NB/T 10068—2018 standard is not perfect on the implementation conditions of post-welding stabilization heat treatment, so it is suggested that the exemption conditions for post-welding heat treatment should be set in combination with engineering practice experience and foreign advanced standards. For thin-walled workpieces with operating temperature ≥500 ℃ and welded joints with small constraint degree, the post-welding heat treatment should be exempted, so as to maintain the scientific and advanced nature of the standard. The NB/T 10068—2018 standard does not fully disclose the related patent information, thus the patent information disclosure should be done well subsequently to prevent intellectual property hijacking of standards. Reference | Related Articles | Metrics Select Reasonableness discussion on hardness upper limit of normalized and tempered T22 steel tubes specified in ASME SA-213M Lai Xianhong, Zeng Hui, Yang Huachun, Zhang Wei Heat Treatment of Metals    2021, 46 (3): 239-242.   doi:10.13251/j.issn.0254-6051.2021.03.046 Abstract （73）      PDF （541KB）（20）       Knowledge map    Simulated normalized and tempered tests with different parameters for T22 steel tubes were performed. The results show that it is very easy for hardness of normalized and tempered T22 steel tubes to exceed the hardness upper limit (163 HBW/170 HV/85 HRB) specified in ASME SA-213M standard, and it is difficult to avoid the spheroidizing microstructure even if the hardness constrainedly reduced to below the hardness upper limit according to special heat treatment parameters, and it is believed that the raising of hardness upper limit for normalized and tempered T22 steel tubes shall be considered. Meanwhile, the suitable raising extent of hardness upper limit is discussed, and further suggestions are that the hardness upper limit for normalized and tempered T22 steel tube specified in SA-213M should be raised from 163 HBW/170 HV/85 HRB to 179 HBW/190 HV/89 HRB. Reference | Related Articles | Metrics Select Current status of heat treatment standards for titanium and titanium alloys Hu Zhijie, Feng Junning, Ma Zhongxian, Xie Chen Heat Treatment of Metals    2021, 46 (3): 243-246.   doi:10.13251/j.issn.0254-6051.2021.03.047 Abstract （81）      PDF （546KB）（47）       Knowledge map    The classification of titanium and titanium alloy heat treatment was introduced, and the common standards for the heat treatment of titanium and titanium alloys at home and abroad were summarized. The problems existing in the understanding and application of heat treatment system in titanium and titanium alloy processing enterprises in China were analyzed, and the future development trend of titanium and titanium alloy heat treatment standards was prospected. Reference | Related Articles | Metrics Select Interpretation of GB/T 38819—2020 Technical requirements and assessment of green heat treatment Dong Xiaohong, Xu Yueming, Chang Yumin, Li Qiao, Wang Guangsheng Heat Treatment of Metals    2023, 48 (4): 307-315.   doi:10.13251/j.issn.0254-6051.2023.04.049 Abstract （26）      PDF （511KB）（31）       Knowledge map    In view of the characteristics of heat treatment enterprises, the requirements of the standard for heat treatment enterprises in basic requirements, heat treatment plant, heat treatment equipment, heat treatment process materials, heat treatment process, management system, environmental emissions and other aspects specified in the GB/T 38819-2020 were interpreted carefully, and the evaluation method of green heat treatment was explained. Reference | Related Articles | Metrics