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Based on physical metallurgy principles, specialists of Severstal and I. P. Bardin Institute developed chemical composition and manufacture technology for microalloyed steel plates for sour service line pipes with minimum guaranteed tensile strength 510 MPa, produced by TMCP (thermo-mechanical controlled process). The key elements of newly developed technology were: low-carbon, low-manganese chemical composition with balanced microalloying; production of clean steel in melting shop; microstructure control during all stages of manufacture process.

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