Comparison Stress Strain Curve of Seamless Pipe

Many of us are working on pipeline design using FEA tools, apart from getting all the boundary conditions set up correctly. There is another crucial element of producing and presenting the right and reliable material behaviour. Especially on carbon steel pipe design above the material yield strength, it gets into the plastic region.

How will the final pipeline integrity behave while the analysis considers with Lüders Plateau Stress-Strain Curve❓ As compared to typical Ramberg-Osgood Stress-Strain Curve❓

What other type of pipeline manufacturing process apart from Seamless pipe will have this Lüders Plateau behaviour❓

Considering the typical RO curve, what are your pipeline design and analysis experience with and without Lüders Plateau❓