Abstract: Analyzed here in the paper are the main aspects of the Φ1 422 mm×21.4 mm X80M SAWH pipe,including the chemical composition,the mechanical properties,the microstructure and the geometric dimensions,etc. Also studied is the effect by the wall thickness on the HAZ hardness of the pipe. It is regarded via the analysis that compared with the Φ1 219 mm×18.4 mm weld pipe,the alloy element range of the Φ1 422 mm×21.4 mm X80M SAWH pipe is obviously less wide,and compared with the requirements as specified under Standard Q/SYGD 0503.2,the mechanical properties of the X80M pipe have rather large margin. The pipe also features good toughness,low residual stress,and well controlled pipe-end dimensions;however there exists certain degree of HAZ softening. It is suggested to pay attention in the follow-up process to the issues like how the wall thickness increase affects HAZ softening of the heavy-wall weld pipe and the weld joint low strength-mating.