Y-Y Ma et aL/Engineering Failure Analysis 47(2015)162-177 (b) Fig 3. Macroscopic appearance of the failed CWP pipe and samples: (a)appearance of the failed connecting pipe, (b)crack A and (c) crack B Chemical composition of the base material and weld joint of the CwP (wte Element SS of the cylindrical body 8.18 290 1.0-23.0 2.5-35 GBT21833 21.0-23.0 45-6.5 2.5-3.5Fig. 3. Macroscopic appearance of the failed CWP pipe and samples: (a) appearance of the failed connecting pipe, (b) crack A and (c) crack B. Table 1 Chemical composition of the base material and weld joint of the CWP (wt%). Element C Cr Ni Mo N DSS of the flange 0.015 22.26 5.20 3.22 0.17 DSS of the cylindrical body 0.019 22.52 5.47 3.02 0.17 Weld joint 0.35 22.22 8.18 2.90 0.11 ASTM-A790/A790M-09 <0.03 21.0–23.0 4.5–6.5 2.5–3.5 0.08–0.20 GB/T 21833 <0.03 21.0–23.0 4.5–6.5 2.5–3.5 0.08–0.20 166 Y.-Y. Ma et al. / Engineering Failure Analysis 47 (2015) 162–177