Abstract: Briefed here in the article are the requirements for home-made clad steel tubes.Taking the commonly- used hydraulic cladding process as an example,the relation between the clad steel pipe material-mating and the tightness is analyzed.It is regarded via the analysis that when designing the internally-lined clad pipe,for getting rather high tightness,the enhanced yield strength ratio between the base pipe and the lining pipe must be bigger than or at least equal to their plastic modulus ratio;in case of the internal lining material as the 316L stainless steel or the N08825 Inconel,in order to get rather high tightness of the clad pipe,the steel grade of the base pipe should be above L360;although it is possible to get rather high tightness with the non-hydraulic cladding process,the overall quality of the pipe as produced with the hydraulic cladding process is much better.