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随着电力工业的发展,大机组锅炉参数不断提高。其受热面管系中低于580℃工作段,通常采用12CrIMoV钢小直径厚壁管,其用量约占管系重量的80％以上。按相应技术条件规定,对12Cr1MoV钢焊接接头需进行焊后热处理工艺,热处理规范为730℃×5min/mm的高温回火。每年在制造、安装和修理中,有数以万计的这类焊接接头需进行焊后热处理,成本既高,又费工时。
With the development of the power industry, large unit boiler parameters continue to improve. Its heating surface tube system in the work section below 580 ℃, usually 12CrIMoV steel small diameter thick-walled tube, the amount of about accounting for more than 80% of pipe weight. According to the provisions of the corresponding technical conditions, 12Cr1MoV steel welded joints required after the heat treatment process, heat treatment specifications for 730 ℃ × 5min / mm high temperature tempering. Every year in the manufacture, installation and repair, there are tens of thousands of such welded joints need to be post-weld heat treatment, the cost of both high and time-consuming.