Automatic Welding, 2020, №03



2020 №03 (05)

DOI of Article 10.37434/as2020.03.01

2020 №03 (02)

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Avtomaticheskaya Svarka (Automatic Welding), #3, 2020, pp.15-21

Use of steels of strength class C350-C490 in the production of building welded structures

V.D. Poznyakov

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 effect of thermal cycles of arc welding on the structure and mechanical properties of metal of the heat-affected-zone of welded joints of microalloyed structural steels of strength class from C350 to C490 was investigated. It was established that as a result of the action of thermal welding cycles, the metal structure of the heat-affected-zone of most microalloyed steels of strength class from C350 to C490, except for 09G2SYuch steel, remains stable bainite in a wide range of cooling rates, and mechanical properties do not change significantly. As a result of welding, at moderate cooling rates the structure of the heat-affected-zone metal in the steel 09G2SYuch can change from bainite to bainite-martensitic and martensitic as the metal cooling rate increases. As a result of that, the values of static strength and impact toughness of the metal are increasing and its ductile properties are reduced. 12 Ref., 5 Tabl., 7 Fig.
Keywords: structural steels, thermal cycle of welding, metal structure, mechanical properties, welded building structures

Received: 17.01.2020

References

1. Zhdanov, S.L., Poznyakov, V.D., Maksimenko, A.A. Dovzhenko, V.A. et al. (2010) Structure and properties of arc-welded joints on steel 10G2FB. The Paton Welding J., 8-12.
2. Poznyakov, V.D., Zhdanov, S.L., Maksimenko, A.A. et al. (2013) Weldability of sparcely-alloyed steels 06GBD and 06G2B. Ibid., 4, 8-14.
3. Poznyakov, V.D., Zhdanov, S.L., Maksimenko, A.A. (2012) Structure and properties of welded joints of steel S390 (S355 J2). Ibid., 8, 6-10.
4. Poznyakov, V.D., Zhdanov, S.L., Zavdoveev, A.V. et al. (2016) Weldability of high-strength microalloyed steel S460M. Ibid., 12, 23-30. https://doi.org/10.15407/as2016.12.04
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6. Ufuah, E. (2013) Elevated temperature mechanical properties of butt-welded connections made with high-strength steel grades S355 and S460M. In: Proc. of Int. Conf on Design, Fabrication and Economy of Metal Structures (Miskolc, Hungary, April 24-26), 407-412. https://doi.org/10.1007/978-3-642-36691-8_62
7. Nazarov, A., Yakushev, E., Shabalov, I. et al. (2014) Comparison of weldability of high-strength pipe steels microalloyed with niobium and vanadium. Metallurgist, 7(9-10), 911-917. https://doi.org/10.1007/s11015-014-9821-6
8. Ragu Nathan, S., Balasubramanian, V., Malarvizhi, S., Rao, A.G. (2015) Effect of welding processes on mechanical and microstructural characteristics of high strength low alloy naval grade steel joints. Defense Technology, 11, 308-317. https://doi.org/10.1016/j.dt.2015.06.001
9. Show. B.K., Veerababu, R., Balamuralikrishnan, R., Malakondaiah, G. (2010) Effect of vanadium and titanium modification on the microstructure and mechanical properties of microalloyed HSLA steel. Mater. Sci. Eng. A, 527, 1595-1604. https://doi.org/10.1016/j.msea.2009.10.049
10. Grigorenko, G.M., Kostin, V.A., Orlovsky, V.Yu. (2008) Modern possibilities for modeling of austenite transformations in low-alloyed steel welds. The Paton Welding J., 3, 31-34.
11. Seyffarth, P. (1982) Schweiss - Z.T.U. - Schaubilder Berlin, VEB Verlag.
12. Sarzhevsky V.A., Sazonov, V.Ya. (1981) Installation for simulation of welding thermal cycles based on machine MCR75. Avtomatich. Svarka, 5, 69-70 [in Russian].

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