What material to choose
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This post was last edited by Paris on 2022-10-12 at 13:13. Request for help: What material should be used for a pipe system handling medium-pressure steam at 420°C and 3.5 MPa? 20G is used for equipment pipelines; is 20G better than 20#?
This post was last edited by Paris on 2022-10-13 08:21. Is 15CrMo a good choice? I’m not very familiar with material selection; I really need some advice!
The operating temperature for 20G should be below 425°C; your temperature is a bit on the high side. For the medium-pressure steam here (4.5 MPa, 450°C), 15CrMo is used in the design.
This post was last edited by Paris on 2022-10-14 at 14:44. Okay, thank you very much. 20G is the pipe material they chose; my equipment uses 15CrMo. 20G is better than 20, right? I’m not very familiar with this material.
They are all made of 20# material; the only difference lies in the manufacturing standards. 20G is steel pipe used for boilers, and its manufacturing standards are relatively high, but it remains 20# regardless. I think it’s fine to choose 15CrMo for the equipment under these operating conditions
20G and 20# are the same; both of these materials can be used (up to a maximum temperature of 475 degrees Celsius).
The temperature has reached the limit of 20 20G
This post was last edited by wswwsw3869 on 2022-10-17 09:02 – it’s biased! Steel 20 is specified in GBT8163; regarding chemical elements and other testing requirements, it does not have as many or as strict specifications as those outlined in GBT5310. The two are completely different things. Especially the red circles.