SiN奥氏体不锈钢配套焊材抗热裂敏感性和焊接接头性能评价

Evaluation of Hot Cracking Sensitivity and Welded Joints Performance for Matching Weld Materials of SiN Austenitic Stainless Steel

  • 摘要: 通过控制Ni、Cr当量,设计并制备了六种SiN奥氏体不锈钢配套焊材,采用环形块焊接试验评价了焊材的抗热裂能力,获得了优化焊材成分,进一步测试了焊接接头的力学性能和耐硝酸腐蚀性能。结果表明:焊材熔敷金属中δ-铁素体含量达到8.2%时不会出现焊接热裂纹;与304L不锈钢对比,SiN不锈钢焊接接头的抗拉强度高,95℃下模拟乏燃料后处理料液(含有一定浓度的氧化性阳离子的6M硝酸溶液)中的腐蚀速率约为0.1mm/a,仅为304L不锈钢焊接接头腐蚀速率的1/4。

     

    Abstract: By controlling the Ni and Cr equivalents, six types of matching welding materials for SiN austenitic stainless steel were designed and prepared. The hot cracking resistance of the fillers was evaluated using a circular block welding test, and the optimal filler composition was determined. Furthermore, the mechanical properties and nitric acid corrosion resistance of the welded joints were tested. The results indicate that no welding hot cracks occur when the δ-ferrite content in the weld metal reaches 8.2%. Compared with 304L stainless steel, the welded joints of SiN stainless steel exhibit higher tensile strength. In a simulated spent fuel reprocessing solution (6M nitric acid containing a certain concentration of oxidizing cations) at 95℃, the corrosion rate of the SiN stainless steel welded joint is approximately 0.1 mm/a, only one-fourth of the corrosion rate of the 304L stainless steel welded joint.

     

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