长管件淬火加热时间的估算方法很多,实践中发现用经验公式得出的加热时间与实际加热时间相差较大。当管长L与管外径2R之比(L/2R)>2.5时,形状对淬火加热时间的影响较大。如把长管件转换成等长的棒料,以棒料的直径(2R′)估算加热时间,可得到较准确的结果。转换方法是将管件视为体积相等的等长 Long pipe quenching heating time estimation method is many, practice found that the empirical formula derived heating time and the actual heating time is quite different. When the tube length L and tube outer diameter 2R ratio (L / 2R)> 2.5, the shape of quenching time greater impact. Such as the long tube into the same length of bar, bar diameter (2R ’) estimated heating time, get more accurate results. The conversion method is to treat the pipe as equal in volume