核电站钢制安全壳SA-738 Gr.B钢免除焊后热处理探讨  

Discussion on Exemption from PWHT of SA-738 Gr.B Steel for Nuclear Power Plant Steel Containment Vessel

作　　者：张俊宝[1] 谷雨[1] 刘卫华 

机构地区：[1]上海核工程研究设计院,上海200233 [2]中国核工业第五建设有限公司,上海201500

出　　处：《热加工工艺》2017年第1期230-232,共3页Hot Working Technology

基　　金：国家重大专项资助项目(2010ZX06002)

摘　　要：CAP1400项目用钢制安全壳采用的是SA-738 Gr.B,筒体段壁厚为52 mm。ASME BPVC Section 3Division 1 Subsection NE-2007标准规定SA-738 Gr.B板材免除焊后热处理的最大壁厚为44 mm。焊后热处理的问题主要是现场电功率不足、施工难度和风险大。本文进行了52、44 mm SA-738 Gr.B钢板交货态的力学性能对比及52mm对接接头焊态、焊后热处理态的对比。试验结果表明,52、44 mm厚母材交货态的力学性能相当,52 mm厚SA-738 Gr.B母材焊后热处理前后的断裂韧性相当。焊后热处理后焊接接头的力学性能降低,对52 mm厚板材手工电弧焊接接头免除焊后热处理是可行的。The material of CAP1400 steel containment vessel is SA-738 Gr.B, and the wall thickness of cylinder section is 52 ram. The maximum wall thickness of Gr.B SA-738 sheet for exemption from PWHT （post weld heat treatment） is 44 mm in ASME BPVC Section 3 Division 1 Subsection NE-2007 standard. The main problem of post weld heat treatment is the shortage of electric power on site, high construction difficulty and risk. In this paper, the comparison tests of the mechanical properties of SA-738Gr.B steel plate with thickness of 52, 44 mm in delivery state and 52 mm butt joint in welding state and post weld heat treatment state were carried out. The test results show that the mechanical properties of base material with thickness of 44, 52 mm in delivery state are quite close, and the fracture toughness of SA-738 Gr.B with thickness of 52 mm before and after PWHT is quite close. The mechanical properties of welded joint after post weld heat treatment decrease. Therefore, the exemption from post weld heat treatment for 52 mrn thick SA-738 Gr.B SMAW joint is feasible.

关 键 词：钢制安全壳 SA-738 G-r.B钢 免除焊后热处理 

分 类 号：TG441.8[金属学及工艺—焊接]