壁厚对9%Cr热强钢管局部焊后热处理温度场的影响
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摘要
对Φ575 mm×35 mm、Φ605 mm×51 mm和Φ580 mm×110 mm等3种规格的9%Cr热强钢管道进行了局部焊后热处理试验,研究了壁厚对管道焊后热处理温度场的影响。结果表明:壁厚增大使管道焊后热处理时的内壁温度明显降低,导致内外壁温差增大,内壁均温区宽度显著减小;对于外径相同的9%Cr热强钢管道,壁厚增大时管道内径减小,散热减小使内外壁温差增长的趋势较内径相同、壁厚增幅相同的管道明显减缓。对厚壁的9%Cr热强钢管道,壁厚对轴向温度梯度的影响较小,因此局部焊后热处理参数选取的关键是使内壁获得足够的均温区宽度,为此需要增大管道加热区的宽度。
Local post weld heat treatment( PWHT) experiment was carried out on three groups of 9%Cr heat-resistant steel pipes with standard specifications of Φ575 mm × 35 mm,Φ605 mm × 51 mm and Φ580 mm × 110 mm,respectively,to study the effect of wall thickness on their temperature fields during PWHT. The results show that the temperature of inner wall decreases significantly with the wall thickness increasing during PWHT,which causes the increase of the temperature difference between inner and outer walls,and the great reduction of soak band width in inner wall of pipe. Compared with the pipes with the same inner diameter,pipes with the same outer diameter show lower increase of the temperature difference between inner and outer walls with the wall thickness increasing. Wall thickness has little effect on the axial temperature gradient in 9%Cr heat-resistant steel pipes during local PWHT. Therefore,it is necessary to increase heated band width to insure a sufficient soak band width of inner wall.
Local post weld heat treatment( PWHT) experiment was carried out on three groups of 9%Cr heat-resistant steel pipes with standard specifications of Φ575 mm × 35 mm,Φ605 mm × 51 mm and Φ580 mm × 110 mm,respectively,to study the effect of wall thickness on their temperature fields during PWHT. The results show that the temperature of inner wall decreases significantly with the wall thickness increasing during PWHT,which causes the increase of the temperature difference between inner and outer walls,and the great reduction of soak band width in inner wall of pipe. Compared with the pipes with the same inner diameter,pipes with the same outer diameter show lower increase of the temperature difference between inner and outer walls with the wall thickness increasing. Wall thickness has little effect on the axial temperature gradient in 9%Cr heat-resistant steel pipes during local PWHT. Therefore,it is necessary to increase heated band width to insure a sufficient soak band width of inner wall.
引文
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[3]沈琦,刘鸿国.新型耐热钢T/P92、T/P122在超超临界机组中的应用及监督[J].电力建设,2010,31(10):71-75.Shen Qi,Liu Hongguo.Application and supervision of new type heatresistant steel T/P92 and T/P122 in ultra-supercritical unit and quality control[J].Electric Power Construction,2010,31(10):71-75.
[4]刘鸿国,张峰,常毅君.新型耐热钢T/P92、T/P122在超超临界机组应用及监督探讨[C]//中国电机工程学会2010年超超临界机组管道及管件国产化研讨会论文集.天津:中国电机工程学会,2011:126-133.
[5]李宏强,张超群,徐昀,等.火力发电厂P91钢管道常见缺陷和监督处理措施[C]//中国电机工程学会金属材料专委会第一届学术年会论文集.太原:中国电机工程学会,2016:561-567.
[6]刘野,赵勇桃,刘宗昌,等.热处理对P92钢组织及硬度的影响[J].金属热处理,2017,42(1):76-79.Liu Ye,Zhao Yongtao,Liu Zongchang,et al.Effect of heat treatment on microstructure and hardness of P92 steel[J].Heat Treatment of Metals,2017,42(1):76-79.
[7]Wang Xue,Zheng Jiangpeng,Shang Wei,et al.Prediction of Ac1temperature in P92 steel weld metal[J].China Welding,2012,21(4):8-14.
[8]刘福广,李太江,王彩侠,等.焊后热处理温度对P92钢焊缝显微组织和力学性能的影响[J].动力工程学报,2011,31(10):803-808.Liu Fuguang,Li Taijiang,Wang Caixia,et al.Effect of post weld heat treatment temperature on microstructure and mechanical properties of P92 weld metal[J].Journal of Chinese Society of Power Engineering,2011,31(10):803-808.
[9]李文彬,姜运建,冯砚厅,等.焊后热处理对P92钢焊缝冲击性能的影响[J].金属热处理,2011,36(7):71-73.Li Wenbin,Jiang Yunjian,Feng Yanting,et al.Influence of postwelding heat treatment on impact property of P92 steel welding seam[J].Heat Treatment of Metals,2011,36(7);71-73.
[10]周烨斌,王洪晖.大口径厚壁P92管道不同形式现场热处理的比较及讨论[J].焊接技术,2011,42(1):8-13.
[11]高洁安,严正,董艳柱,等.SA335-P92钢管采用感应加热焊接热处理工艺试验[J].电力建设,2010,31(10):109-113.Gao Jiean,Yan Zheng,Dong Yanzhu,et al.Experiment on welding heat treatment technique for SA335-P92 steel tube by induction heating[J].Electric Power Construction,2010,31(10):109-113.
[12]苗艺.P92管道焊后局部热处理的研究[D].天津:天津大学,2012.
[13]郭国均,张学锋,庞云泉,等.P92超厚壁管焊缝热处理工艺研究[J].电力建设,2009,30(2):96-97.
[14]倪晓红.P92大径厚壁管采用内保温电阻加热热处理工艺分析[J].电焊机,2012,42(12):39-42.Ni Xiaohong.Analysis of internal blocking resistance heat treatment process for large diameter and thick wall pipe[J].Electric Welding Machine,2012,42(12):39-42.
[15]Li Peilin,Fan Ruizhi,Lu Hao.Temperature field analysis of main steam pipe under local post weld heat treatment[J].China Welding,2010,19(4):20-24.
[16]胡磊,王学,孟庆云,等.9%Cr钢厚壁管道局部焊后热处理温度场的数值模拟[J].焊接学报,2015,36(12):13-16.Hu Lei,Wang Xue,Meng Qingyun,et al.Numerical simulation of temperature field in 9%Cr steel thick-wall pipe in local PWHT[J].Transactions of the China Welding Institution,2015,36(12):13-16.