15crmo合金板具有一定的耐氢耐腐蚀性
The metal structure of15crmo合金钢板是马氏体，在650摄氏度约为650摄氏度的耐氧化性良好，具有良好的热强度低于600摄氏度，具有良好的减震和导热性。它广泛用于蒸汽轮机。然而，15crmo平板具有较大的硬化趋势并具有差的可焊性。5-70mm厚的15crmo板可以滚动期货。
Features of15crmo钢铁板材：它具有良好的抗氧化性，耐腐蚀性和质地稳定性。热强度高，工艺性能良好。
15CrMo alloy plate is a pearlitic heat-resistant steel with high heat strength (δb≥440MPa) and oxidation resistance at high temperature, and has certain resistance to hydrogen corrosion. Due to the high content of Cr, C and other alloying elements in the steel, the hardening tendency of the steel is obvious and the weldability is poor.
Therefore, the preheating temperature was selected to be 150 °C. The test piece is heated by the oxygen-acetylene flame. Firstly, the temperature of the surface of the test piece is roughly judged by the temperature measuring pen (estimated by the change of the color of the handwriting), and finally measured by a semiconductor thermometer, and at least three points should be selected for the measurement point. In order to ensure that the test piece as a whole meets the required preheating temperature.
15CrMo Alloy Plate Welding
When welding, the first layer is made by manual tungsten argon arc welding. In order to avoid the depression on the back side of the weld at the back weld, the inner wire is used for wire feeding, that is, the wire is fed from the pipe through the gap. The remaining layers are welded by electrode arc welding, and 6 layers are welded together, one weld bead per weld layer.
It is feasible to use two welding schemes for the welding of 15CrMo steel thick-walled high-pressure pipes. In order to ensure that the weld bead performance is matched with the base metal and has high heat strength, the effect of the scheme I is better, and the key is to strictly control the post-weld heat treatment process.
Although the post-weld heat treatment can be omitted, the possibility of weld migration at the high temperature and the weld seam is not negligible, so it can only be used cautiously after heat treatment after welding.
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