Can 345 be used at temperatures over 350 degrees in a pressure vessel at atmospheric pressure?
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NB47003 only specifies 350 degrees; should it not be used above 350 degrees? !
Yes, when using at high temperatures, the tendency of carbon in steel to form graphite must be taken into account; it is recommended to use Cr-Mo steel
Okay, thank you. . . . What is the steel with the highest operating temperature? !
Do not exploit loopholes in the standards; when the temperature reaches 350°C for Q345, and if your design pressure also requires 350°C, then Cr-Mo steel should be used. S30408 and S31608 can also be used.
The design of non-pressure equipment is quite flexible. Temperature and pressure curves are not only relevant to flanges but also serve as a reference for the design of certain equipment structures.
I think it can be used; the pressure vessels with a rating of 150.2 can handle temperatures up to 475°C, so why can’t the atmospheric-pressure vessels handle 350°C?
Carbon steel equipment is generally not suitable for temperatures exceeding 350 degrees; this is also related to the medium contained within the equipment and the relevant hazard factor k value. When hydrogen is present, the hydrogen partial pressure must be taken into account, and the Nelson curve specified in HG/T20581 should be referred to.
Okay, thank you. . . . . For my project, the inlet temperature is over 450, and I’m using 235! ! ! ! Hehe, this is what engineering is all about! ! ! ! ! !
What is the difference between 345 and 316 materials? For our 350-degree heat transfer oil, we use 316 material