分别从蠕变裂纹扩展的控制参数，临界裂纹长度及剩余寿命三方面对HK40转化管进行了结构完整性研究。
The structure integrity of HK40 reformer tube is studied in respect of the controlling parameter of creep crack growth, the critical crack length and the residual life.
方管作为结构构件，在压、弯、扭方面具有优越的性能。
As structural component, square hollow steel sections have favorable properties for resisting compression, bending and torsion.
由方管直接焊接组成的结构，节点构造简单，加工方便，造价较低，在国内外已被广泛应用到各种工程领域。
The structures made of square hollow steel sections by using the directly welded joints are fabricated easily and economically, which can be found in many applications all over the world.
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