Questions about 304 stainless steel
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May I ask the experts here: what is the temperature tolerance of 304 seamless steel pipes? ? ? What is the lowest temperature? ? Can 304 stainless steel pipes be hot bent? ? ? The temperature reaches 900 degrees during hot bending; does this have an impact on the material’s properties after hot bending? ? For example, corrosion resistance, etc. Please answer if you are an expert; I’m a beginner, so I appreciate any guidance you can provide. Thank you
When I was on site before, I could perform hot bending in this way. However, there are prerequisites: the pipeline pressure must not exceed 0.5 MPa, the medium temperature must not be higher than 100 degrees, the pipeline diameter must not be larger than DN32, and it must be a pipeline for non-highly corrosive media. And before, we would perform heat bending followed by heat treatment for insulation. (That is, after thermal bending, the temperature is gradually reduced using insulating materials or sand.)
For 304 material, a temperature of over 1200 should generally not be exceeded; there shouldn’t be any problems with that. Heat bending is likely to present difficulties. As mentioned above, the quality of the medium used is average, and it can be tried as long as the pressure isn’t high. There’s no issue with water pipes, but alkaline pipes are not recommended.
Thank you very much. I also have a question: what is the maximum hot bending radius? ? ?
The medium is nitrogen at a pressure of 4 MPa
Do you mean temperature by 1200? ?
Good question, I’m paying attention to it – let’s push it up
For 304 stainless steel pipes with small diameters, cold bending is the preferred method; hot bending is also an option, provided that the temperature does not exceed the crystal transformation temperature. It is advisable to use a bending radius of ≥… Using a mandrel during cold bending yields better processing quality; if no mandrel is available, hot bending is a better choice!
The low temperature can reach minus 196 degrees Celsius, and no low-temperature shock test is required
Thermal bending has an impact on the quality of the material; what’s crucial is to consider the requirements for pipeline material in your application