What are the problems encountered when calculating the SW6 strength of Q345D pipes, and what are the solutions?
Thread Content
Standard GB 6479-2013 adds Q345D pipes (while removing 16Mn pipes); currently, many of the pipes purchased by our company are of type Q345D in accordance with GB 6479-2013. When performing strength calculations for SW6, the Q345D material specified follows the requirements set out in GB150-2011 and GB 8163. However, errors are encountered during these calculations (especially when the wall thickness exceeds the limits specified in GB150.2-2011), and the material cannot be selected. When stress values are entered manually (particularly when Q345D pipes are used for the tube sections, it is not possible to calculate the strength of those sections or the reinforcement elements provided on them), an error message indicating that a calculation cannot be performed appears. How can this issue be resolved? The Technical Center station directly suggested applying patches for improvement, but the phone call couldn’t be connected. Can Q345D from GB 6479-2013 be used directly as a substitute for 16Mn?
Q345 contains a small amount of V, Ti, and Nb alloys, which enhances the toughness of the steel; as a result, its overall mechanical properties are significantly improved. Therefore, the comprehensive mechanical properties of Q345 steel should be superior to those of 16Mn steel, especially its low-temperature performance, which is not available in 16Mn steel. In my opinion, before patches are applied to SW6, 16Mn can be used in place of Q345D for reinforcement calculations. Manually change the data in the calculation book.
I tried calling the Shanghai Technology Center office today, but no one answered, and the website wouldn’t load either; I had proposed making some corrections.
The software updates are not timely, and the material data contained in it is based on old standards； It hurts in the testicles
You can customize the desired materials in the user material database
Find a material with lower performance than Q345D and calculate; if that calculation succeeds, then Q345D will also pass.
Calculate based on 16Mn, and then make manual adjustments
Our company’s drawings specify 16Mn; however, Q345D/E materials are being used as a substitute
The approach upstairs is correct; it’s not that the software isn’t being updated.
How is it that the central station can’t be reached anymore :o