焊接9%Ni钢用国产ENiCrMo-4焊条研制

发布时间：2018-03-06 13:13

  本文选题：9%Ni钢　切入点：ENiCrMo-4焊条　出处：《江苏科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文在综述国内外9%Ni钢用ENiCrMo-4焊条研究现状的基础上,依据美国AWS A5.11标准、ASTM G28标准、国家标准GB/T 13814及中国石化集团洛阳石油化工工程公司16万立方米储罐项目低温性能要求的规定,联合上海大西洋焊材有限公司设计并制备了用于天燃气行业9%Ni钢用的三种国产ENiCrMo-4焊条,分析测试了三种焊条熔敷金属的成分和力学性能。采用上述三种焊条手工电弧焊焊接9%Ni钢,并和国外同类型的ENiCrMo-4焊条焊接的接头进行对比分析,确定了综合性能最佳的焊条配方;采用最佳的焊条焊接9%Ni钢,研究焊接电流对焊接接头的成分、组织和力学性能的影响。熔敷金属试验结果表明:研发的三种焊条均符合AWS A5.11、GB/T 13814标准的要求。但ENiCrMo-4焊条C综合性能最优。ENiCrMo-4焊条C的熔敷金属中C、Si含量分别为0.019%和0.166%,P、S等杂质元素含量最低,抗拉强度Rm为758Mpa,屈服强度Rp0.2为497Mpa,断后伸长率A为35.1%,硬度为262.85。国内外ENiCrMo-4焊条焊接9%Ni钢对比试验表明:ENiCrMo-4焊条C焊接的接头具有最佳的综合性能,其接头在焊缝中心、熔合线和熔合线+2mm处的-196℃低温冲击值分别为90J、93.3J、119J,均满足中石化储罐项目中的要求;通过ASTM G28腐蚀试验表明,ENiCrMo-4焊条C的耐腐蚀性亦优于国外焊条。焊接电流对ENiCrMo-4焊条C焊接9%Ni钢接头的性能有明显的影响。焊接电流为130A时,焊接接头的力学性能、抗裂性能和耐腐蚀性能等均为最佳,其接头的抗拉强度Rm为741Mpa,屈服强度Rp0.2为458Mpa,屈强比为0.62,断后伸长率A为41%;接头在焊缝中心、熔合线处、熔合线+2mm处的低温冲击功分别为89.3J、92J,94.7。
[Abstract]:On the basis of summarizing the research status of ENiCrMo-4 electrode for 9Ni steel at home and abroad, according to AWS A5.11 standard and ASTM G28 standard, The national standard GB/T 13814 and the requirements for the low temperature performance of the 160,000 cubic meter storage tank project of Luoyang Petrochemical Engineering Company of Sinopec, Three kinds of domestic ENiCrMo-4 welding rods used in natural gas industry 9and Ni steel have been designed and prepared by United Shanghai Atlantic Welding material Co., Ltd. The composition and mechanical properties of three kinds of electrode deposited metals were analyzed and tested. The welding joints of 9Ni steel were welded by manual arc welding of the above three kinds of electrodes and compared with the joints welded by the same type of ENiCrMo-4 electrode abroad. The optimum composition of welding current for welding joint was studied by welding 9Ni steel with the best electrode. The effect of microstructure and mechanical properties. The results of the deposited metal test show that the three kinds of electrode developed meet the requirements of AWS A5.11GBT / 13814 standard, but the optimum comprehensive properties of ENiCrMo-4 electrode C are 0.019% and 0.019% in the deposited metal of ENiCrMo-4 electrode C, respectively. The content of impurity elements, such as 0.166% and 0.166%, was the lowest, Tensile strength RM is 758Mpa. yield strength Rp0.2 is 497Mpa.After breaking elongation A is 35.1and hardness is 262.85.The comparative test of 9Ni steel welded by ENiCrMo-4 electrode at home and abroad shows that the joint welded by ENiCrMo-4 electrode C has the best comprehensive properties and the joint is in the center of weld. The low temperature impact values of the fusion line and the fusion line at 2mm at -196 鈩，

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