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为避免变压器的漏磁场在钢件中产生涡流热损耗,在变压器的钢结构设计中已大量采用隔磁性能好的20Mn23Al无磁钢。这种钢属于高合金钢类,它完全可以代替奥氏体不锈钢(1Cr18Ni9Ti),但如果焊接不合适,焊缝易产生裂纹,导致变压器油箱渗漏,如何解决焊接中的开裂问题,现简要分析如下。 1.20Mn23Al钢的基本性能 20Mn23Al钢为稳定的纯奥氏体组织,与1Cr18Ni9Ti铬镍奥氏体不锈钢有完全相同的组织,晶体组织为面心立方晶格,称为铁—锰—铝系奥氏体低温钢。此钢在高温条件下,仍
In order to avoid transformer leakage magnetic field generated in the steel eddy current heat loss in the steel structure design of the transformer has been widely used magnetic insulation properties of good 20Mn23Al non-magnetic steel. This kind of steel is high alloyed steel, it can completely replace austenitic stainless steel (1Cr18Ni9Ti), but if the welding is not suitable, the weld is easy to crack, leading to transformer oil tank leakage, how to solve the welding cracking problem. as follows. 1.20Mn23Al basic properties of steel 20Mn23Al steel is pure and stable austenitic structure, and 1Cr18Ni9Ti chrome-nickel austenitic stainless steel has the same organization, the crystal structure of face-centered cubic lattice, known as the iron - manganese - aluminum-based austenitic Body low temperature steel. This steel is still under high temperature conditions