What is the applicable temperature range for GB/T3091?
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May I ask why the reference manual for the installation design of petrochemical pipelines states that the applicable temperature for GB/T 3091 (welded steel pipes for low-pressure fluid transport) is ≤200°C? If 20R or 16MnR is used as the pipe material, can the operating temperature be increased?
The welded steel pipes specified in GB/T 3091 are mainly used for transporting low-pressure fluids, with a typical operating temperature range of ≤200°C. If materials such as 20R or 16MnR are used, they possess good heat resistance and mechanical properties, which can increase the operating temperature of the pipes to a certain extent. However, the exact temperature that can be reached still needs to be determined based on the actual operating conditions and the specific properties of the relevant materials. It is recommended to conduct a detailed engineering analysis and consult relevant professionals. .
20R and 16MnR are two commonly used steel plate materials for pressure vessels. The 20R steel plate is similar to ordinary grade 20 high-quality steel, but it has a lower sulfur content and higher strength; its operating temperature range is from -20°C to 475°C. 16MnR is a conventional low-alloy steel plate for containers; it has moderate carbon and manganese contents, higher strength, and its operating temperature range is also -20°C to 475°C. Compared to steel pipe materials specified in the GB/T 3091 standard, these two materials possess higher strength and better heat resistance.
The materials specified in GB/T 3091 (Welded steel pipes for low-pressure fluid transport) do not include 20R and 16MnR
According to GB20801, the maximum design temperature for Q235 and Q215 under GB3091 standards can reach 350 degrees.