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随着我国大型水电站的建设,低合金高强度钢在水轮机涡壳制造中,日益得到广泛的应用。去年,曾首次把厚36毫米的14锰钼钒氮钢板(δs≥50公斤/毫水~2),用于某电站的水轮机涡壳制造中。但是,在现场装焊时,接头区出现了严重的焊接裂缝,影响了施工质量和进度。因此,焊接裂缝是大型水轮机涡壳制造中,能否采用δs≥50公斤/毫米~2低合金高强度钢的一项急需解决的技术关键。目前,国内焊接屈服强度为50公斤/毫米~2的低合金高强度钢产品(特别是中、厚板
With the construction of large hydropower stations in China, low alloy high strength steel has been widely used in the manufacture of turbine turbines. Last year, for the first time, 14mm thick manganese-manganese-vanadium-nitrogen steel plates (δs≥50kg / m 2) were used in the manufacture of turbine turbines of a power station. However, when welding at the site, serious weld cracks appeared in the joint area, which affected the construction quality and progress. Therefore, the welding cracks in the manufacture of large turbine turbines, the ability to adopt δs ≥ 50 kg / mm 2 low alloy high strength steel an urgent need to solve the technical key. At present, the domestic welding yield strength of 50 kg / mm ~ 2 low-alloy high-strength steel products (especially in the plate