Automatic Welding, 2023, №06



2023 №06 (01)

DOI of Article 10.37434/as2023.06.02

2023 №06 (03)

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Avtomaticheskaya Svarka (Automatic Welding), #6, 2023, pp. 8-17

Application of structural steels in above-ground cylindrical tanks construction after normalized rolling

A.Yu. Barvinko, Yu.P. Barvinko, A.M. Yashnyk

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The work investigates the structure and ductility of sheet rolled steels of the strength class 355 and 420 in the plane X-Y. It is shown that the use of normalized rolling does not provide sheet rolled steel S355+N the state, which is equivalent to the state after normalization. As a result of carrying out normalized rolling, due to the additional compression of the sheet in the temperature region near the temperature Ac3, a banded structure is formed in steel, which has a high anisotropy of mechanical properties. The formation of such a fibrous structure leads to a brittle state of the metal in the plane X-Y at a design metal temperature. To prevent brittle layered fracture, it is necessary to use structural steels of the strength class S355 and S420, produced in accordance with the standard DSTU EN 10025-3:2007 in a state after normalization and limit the content of sulphur S ≤ 0.010 %. In the case of using the mentioned steels in the state after normalized rolling, it is recommended to use a metal with a thickness of not more than 15 mm, which will provide a safe service of a metal in welded assemblies over the direction of thickness. An additional criterion for stability of sheet rolled steels S355 and S420 to the brittle layered fracture, in addition to the rolled metal quality Z group, it is proposed to use such an indicator as impact energy, which is determined on the specimens with a V-shaped notch in the plane of rolling X-Y (along the sheet axis). 24 Ref., 10 Tabl., 3 Fig.
Keywords: structural steels of strength class 355 and 420, normalized rolling, lamellar-brittle failure, above-gound cylindrical steel tanks


Received: 03.04.2023

References

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