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Pervoural’sk, Russia

Lisienko V.G.,Ural Federal University | Nurmukhametova M.R.,OAO Pervouralskii Novotrubnyi Zavod | Titaev A.A.,Ural Federal University
Steel in Translation | Year: 2015

A method is proposed for determining the actual heat-treatment conditions of oil and gas pipe, with allowance for the heat transfer within the furnace chamber. High tempering of 13XΦA steel pipe of elevated operational reliability (strength group K52) is simulated. The precision in simulating the treatment parameters exceeds that achieved by standard monitoring methods. The actual onset of isothermal holding is determined. Corresponding correction of the tempering conditions permits 18-fold reduction in the rejection rate associated with furnace treatment (that is, in the quantity of pipe sent for repeated heat treatment). © 2015, Allerton Press, Inc. Source

Safronov A.A.,OAO Pervouralskii Novotrubnyi Zavod | Gorbunov V.V.,OAO Pervouralskii Novotrubnyi Zavod | Tazetdinov V.I.,OAO Chelyabinskii Truboprokatnyi Zavod | Torokhov G.V.,OAO Pervouralskii Novotrubnyi Zavod
Steel in Translation | Year: 2013

The nitrogen content of pipe steel is tracked during smelting and ladle treatment. The electro-smelting of steel with limited nitrogen content (no more than 0.008%) in the Zheleznyi Ozon 32 system (introduced in 2011 at OAO Pervoural'skii Novotrubnyi Zavod) is considered. Data for the production of continuous-cast billet from pipe steel containing up to 0.012% are considered; the final mean nitrogen content in steel is 0.0078% with vacuum treatment and 0.0084% without vacuum treatment. The results show that increasing the oxygen consumption in the arc furnace may increase the steel's nitrogen content, rather than reducing it. The optimal treatment time of the steel in the ladle-furnace unit is of great importance in the production of steel with limited nitrogen content. Brief treatment in the ladle-furnace unit is likely to result in steel with high nitrogen content. Prolonged and very prolonged treatment also increases the nitrogen content. © 2013 Allerton Press, Inc. Source

Safronov A.A.,OAO Pervouralskii Novotrubnyi Zavod | Prilukov S.B.,OAO Pervouralskii Novotrubnyi Zavod | Gasilov A.Y.,OAO Pervouralskii Novotrubnyi Zavod
Steel in Translation | Year: 2013

The macrostructure of 10, 20, 09Γ2C, and d{cyrillic}b{cyrillic} steel billet (diameter 150 and 220 mm) is investigated. Regardless of the casting parameters and grade of steel, the metal in the continuous-cast billet studied contains sections distributed randomly over the length that are characterized by impermissible central porosity in tests. The nonuniform distribution of this defect over the length of the billet is due to unstable solidification of the central zone and is not eliminated in continuous casting of the steel. The research permits the adoption of a new edition of Technical Specifications TU 14-159-324-2012 for continuous-cast billet, with requirements on the extent of the central porosity. © 2013 Allerton Press, Inc. Source

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