Development of the external pressure charts of 2 Cr-1Mo and Mod.9Cr-1Mo steel at elevated temperature design

Ando, Masanori ; Okajima, Satoshi ; Imo, Kazumichi*

For the required thickness estimation against buckling in the elevated temperature design, the external pressure chart for two kinds of ferritic steel, 2 Cr-1Mo and Mod.9Cr-1Mo steel, was developed. On the basis of the guideline described in the ASME BPVC Section II, Part D, Mandatory Appendix 3 with mechanical and physical properties provided in the JSME fast reactor code, the external pressure charts for each material were constructed. As the result, three external pressure charts with digital values were proposed for elevated temperature design. And the rationalization effect from the current alternative using was evaluated by the sample problem. This proposal resolves the two issues. One is alternative use of inferior material strength chart over the 150C. The other is the external pressure chart above 480C for these ferritic steels are not available.