Abstract: In order to investigate flexural buckling of stainless steel welded box-section beam-columns, 5 austenitic and 5 duplex stainless steel welded box-section columns are loaded eccentrically, with values of slenderness varying from 55 to 85. The design loading eccentricities are 50 mm, 60 mm and 70 mm, and the initial bending and loading eccentricities are measured before the test. The static loading capacity of the components is analyzed based on the test results, which are compared with the predictions based on current specifications CECS 410:2015 and EN 1993-1-4. The results indicate that all members failed in the form of overall flexural buckling without obvious local buckling. The bearing capacity decreases with increase of slenderness and loading eccentricities. For the duplex stainless steel welded beam-columns, both EN 1993-1-4 and CECS 410:2015 provide conservative prediction on the loading capacity. Moreover, as for the austenitic stainless steel welded beam-columns, EN 1993-1-4 also provides conservative prediction on the loading capacity. Although the test results of individual specimens are slightly lower than the calculation results of CECS 410:2015, most prove to be safe generally.