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Stainless Steel Plate Welding Need To Pay Attention To Corrosion Resistance
Jun 26, 2017

(1) Pitting test test medium: 1.5% FeC13 · 6H20 + 3% NaCI + 20m / L HAC, 40Co, pH -2,24h. The results of the test are shown in Table 7 - 6- 20. The results show that the corrosion resistance of the three kinds of electrodes is at the same level as that of the 18 - SMo steel itself.

(2) stress corrosion test using a single U-shaped deformation of the sample, the test medium for 25% NaCI + 1.% K2Cr07 +74% H20, boiling (108 ℃). The test results are listed in Table 7-6-21, indicating that the welded joints obtained from the molybdenum-containing Austrian 022 silicon and ultra low carbon Austrian 312 electrodes have a high resistance to stress corrosion cracking and that the molybdenum-free Austrian 302 electrode The obtained welded joint has a lower resistance to stress corrosion cracking.

(3) intergranular corrosion test CuS04 + H2S04 + Cu chip method for intergranular corrosion test, the test results shown in Table 7-6-22 can be seen, the three welding electrodes are not intergranular corrosion tendencies, and two The weld HAZ of the state plate has a slight intergranular corrosion tendency, and the intergranular corrosion tendency of the hot-rolled WZ is higher than that of the HAZ intergranular corrosion, which is greater than that of the 18-5Mn steel welded joint Corrosion test results are consistent.

In summary, the corrosion resistance of the welded joint of the composite steel plate and the corrosion resistance of the 18 - 5Mo steel welded joint are similar. The results of the pitting test of the welded joints of the three electrodes are equivalent to those of the base metal. Austrian 022 silicon, ultra low carbon Austrian 312 welding electrode welding stress corrosion resistance is good, and Austria 302 weld resistance to stress corrosion is poor: whether the normal plate or hot plate, in the welding HAZ were not found Stress corrosion cracking. Hot-rolled plate welding HAZ intergranular corrosion tendency seems to be larger, normalized plate with a slight intergranular corrosion tendency, but also to meet the requirements. In addition to the residual internal stress, the intergranular corrosion tendency of HAZ in hot rolling state is also related to the large amount of ferrite in the corrosion resistant layer.