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In Table 4–1 of GB150.3, which provides the stability check tables for cylinders under internal and external pressures, Q235 is not listed. So how should cylinders subjected to external pressure be calculated?
Hard work on your part, it’s the New Year – get some rest
Q235A is not permitted to be used as primary compression components, while the use of Q235B and Q235C is restricted; for details, see Appendix D of GB/T150.2-2011
GB150-1998 should have relevant data
Who uses 235 these days? 245R costs only a little more, after all