Which material is better between 16MnR and 15MnVR?
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Design pressure: 4.0MPa, design temperature: 350 degrees, diameter 2100, length 5000, corrosion margin 1.6 The medium is non-toxic and harmless. I chose 16MnR, but the thickness is very thick 40. You can choose 15MnVR with a thickness of 32. The latter is allowed to be used at the design temperature. The force is much higher than the former. I think it is better to choose the latter. The chemical composition of the two is similar, and the C content of 15MnVR is slightly less than that of 16MnR. So I would like to ask seniors to give me some advice. Why should I choose 16MnR instead of 15MnVR in this working condition?
:) When selecting materials, you must not only consider whether the material meets the design requirements, but also consider the economic adaptability of the material, such as price factors, processing, welding, procurement difficulty, etc.
The performance of 16MnR is better than that of 15MnVR. The addition of V increases the brittleness and hardness of the steel. It is easy to produce hardened structures during the welding process, which in turn produces large welding residual stress. In addition, 15MnVR also has a tendency to produce cold cracks. As for why 16MnR is used in the above working conditions, I don’t know how to explain it: loveliness:
Is it considering container processing issues?
The strength of 15MnVR steel is slightly higher than that of 16MNR steel, but the plasticity and low-temperature impact toughness are lower and the fluctuation is larger. In order to improve the plasticity and toughness, it can be normalized. The notch sensitivity and aging sensitivity of 15MnVR are greater than that of 16MNR steel. When it undergoes a large degree of cold deformation, stress relief annealing should be performed. Its post-weld cold cracking tendency is slightly greater than that of 16MNR
There are several things to consider when choosing materials, such as mechanical properties, chemical properties, economy, etc. As far as the current situation is concerned, I agree with the hanging point on the fifth floor.
^_^, I don’t quite understand! ! ! ! ! !
16MnR is better and is used for liquefied gas tanks, etc.