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一、用途和性能20Cr1Mo1VTiB钢是高温紧固件用钢,其运行温度是540℃左右。国外同类参数机组采用的是变性12%Cr钢和高铬镍奥氏体钢,甚至用镍基合金,国内过去一直采用25Cr2Mo1V制造高温紧固件。这种钢在不太长的运行后期,便有脆化现象,往往造成脆断破坏。20Cr1Mo1VTiB钢是贝氏体钢。于1969年安装在某电厂7号锅炉的主汽门以及5号机的流量孔板,主蒸汽室和调速器门上,并与25Cr2Mo1V钢螺栓进行
First, the use and performance 20Cr1Mo1VTiB steel is high temperature fasteners steel, the operating temperature is about 540 ℃. Foreign similar parameters of the unit is denatured 12% Cr steel and high chromium austenitic austenitic steel, and even nickel-based alloys, the domestic past has been using 25Cr2Mo1V manufacturing high-temperature fasteners. This steel is not too long after the operation, there will be embrittlement, often resulting in brittle fracture damage. 20Cr1Mo1VTiB steel is bainitic steel. In 1969 installed in a power plant on the 7th boiler main steam valve and the No. 5 machine orifice, the main steam chamber and governor door, and with 25Cr2Mo1V steel bolts