Replay:
1, martensitic stainless steel electrode martensitic stainless steel, including 5 to 9% chromium in chrome steel and chromium 12% of high-chromium steel. Such steel hardened tendency, after welding, is easy to produce a high hardness martensite and bainite so that brittleness increases, the residual stress is also large, easy to produce cold cracks. Must be so general before welding preheat and inter-layer insulation, high-temperature tempering after welding yet cooled. 2, chrome 13 stainless steel welding: these chrome steel after welding sclerosing easily cracks, the use of a similar chromium stainless steel electrode (CHK202, CHK207) welding, preheat and solder must be above 300 ℃ 700 ℃ and tempering slow cooling process. If the weldments can not weld treatment, the application of a chromium stainless steel electrode welding (CHS107, CHS207). 3, Chromium 17 stainless steel welding: Such chromium steel usually improving the corrosion resistance and weldability and add the appropriate amount of the stabilizing elements titanium, niobium, molybdenum, weldability than chromium 13 steel as well, the same type can be used chromium stainless steel welding electrodes (CHK302, CHK307). Before welding, weldment should be about 200 ℃ preheat about 800 ℃ tempering after welding. Can also be used chrome-nickel stainless steel electrode (such CHS107 CHS207), post-weld heat treatment. |
