对细长管件内壁进行强化处理以提高其使用寿命,用一般热处理方法是比较难于实现的。氮化处理虽是变形比较小的一种强化方法,但对于直径比较小、细长比很大的管件,用气体氮化法很难保证内壁获得均匀的氮化层;若采用液体氮化法,则氮化后需进行繁杂的清洗 Slender tube wall to strengthen the treatment to improve its life, with the general heat treatment is more difficult to achieve. Although the nitriding is a relatively small deformation deformation method, but for the smaller diameter, slenderness ratio of the tube, with the gas nitriding method is difficult to ensure that the inner wall to obtain a uniform nitriding layer; if using liquid nitriding , Nitrification needs complicated cleaning