Abstract
80 specimens of different microstructure were prepared from arc-welded steel plates, which were welded with mildsteel, 1.5%Cr-Mo steel, 5%Cr steel, 13%Cr steel and 18Cr-8Ni steel deposited metals, under the adequate welding conditions. The mechanical properties of specimens and their defects were inspected by means of X-ray and supersonic waves.Then, the loss by corrosion, volume of hydrogen produced, and their electrode potential in 10% H2SO4, HCl, at the welded and annealed states, were measured. Welded strain was also studied.The results are as follows;1) The corrosion loss, and fuming hydrogen volume are changed remarkably according to the microstructure.2) It is not so efficient to use 1.5%Cr-Mo steel as the deposited metal for corrosion prevention.3) It is natural that the corrosion resistance of bead part is much increased when 18-8 steel is used as the deposited metal.4) The corrosion resistance of high sulphur mild steel plate is low as compared with low sulphur mild steel plate.
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