Koptsev L.A.,Magnitogorsk Metallurgical Combine MMK
Metallurgist | Year: 2011
This article examines the energy content of steel production in an arc steelmaking furnace (ASF), the effect of furnace performance on the energy content of the combine's products, the feasibility of optimizing the energy balance of the ASF so as to minimize energy costs while still providing the energy resources necessary to execute the production process, and the effect of various factors on the technical and economic indices of ASF operation. It is found that making the operation of the furnace more cost-effective will require multiparameter optimization of its operating regime both for individual heats and for the shop as a whole on a week-to-week or month-to-month basis. © 2011 Springer Science+Business Media, Inc.
Shemshurova N.G.,Magnitogorsk State Technical University |
Urmatskikh A.V.,Magnitogorsk Metallurgical Combine MMK |
Lokotunina N.M.,Magnitogorsk State Technical University
Metallurgist | Year: 2014
This article examines features and practical introduction of a technology for making high-rigidity special sections on section-bending machines at the Magnitogorsk Metallurgical Combine. It also describes characteristics of the configurations of these products and their main service properties. © 2014, Springer Science+Business Media New York.
Nastich S.Y.,Bardin Central Research Institute for The Iron And Steel Industry |
Soya S.V.,Bardin Central Research Institute for The Iron And Steel Industry |
Molostov M.A.,Magnitogorsk Metallurgical Combine MMK |
Vasiliev I.S.,Magnitogorsk Metallurgical Combine MMK |
Dyakonova N.B.,Bardin Central Research Institute for The Iron And Steel Industry
Metallurgist | Year: 2012
Microstructural parameters, impact strength, and DWTT properties of coil steel X70 are governed to a considerable degree by a sufficiently high temperature for the start of rolling in 2000 mill finish stands (T sfr). Results are provided for a study of steel microstructure in relation to cold brittleness threshold during DWTT (T 90) and proportion of bainitic ferrite on T sfr. Rolling with T sfr close to a temperature for retarding recrystallization (T 5 or T NR) causes a difference in steel matrix grain size and an increase in volume fraction of bainitic transformation products with lath morphology (bainitic ferrite) due to partial austenite recrystallization. This structure leads to the worsening of steel impact strength and DWTT properties. The properties of coil steel may be improved by increasing steel niobium content and rolled product interim cooling. © 2012 Springer Science+Business Media New York.
Zaitsev A.I.,Bardin Central Research Institute for The Iron And Steel Industry |
Stepanov A.B.,Bardin Central Research Institute for The Iron And Steel Industry |
Sarychev B.A.,Magnitogorsk Metallurgical Combine MMK |
Dzyuba A.Y.,Magnitogorsk Metallurgical Combine MMK |
Shaposhnikov N.G.,Bardin Central Research Institute for The Iron And Steel Industry
Metallurgist | Year: 2015
A detailed study is made of the effect of the form and content of impurities and nonmetallic inclusions on the quality characteristics of spring steels of type 60C2XA. It is established that to prevent the formation of “blowhole” defects it is necessary to limit the steel’s content of gas-forming elements as follows: [H] < < 3.5 ppm, [N] < 60 ppm, [O] < 11 ppm, and [C] < 0.54%. It is shown that the hydrogen content of the steel has the strongest effect on the formation of such defects. To make the steel cleaner in terms of its content of nonmetallic inclusions, it is best to make a metallic semifinished product with a high carbon content and a low (200–400 ppm) content of active oxygen, add carbon-bearing materials early during tapping, and proportion the additions of manganese- and silicon-bearing ferroalloys in a regime which leads to the formation of easily removed silicate inclusions. Another effective measure is to use assimilating covering slags composed of two layers in the tundish. To obtain good quality characteristics for rolled products, it is necessary ensure that the combined content of Sn, Pb, and Zn does not exceed 0.008–0.013% and to use a certain temperature-time regime for the casting operation. Here, the optimum degree to which the steel is heated above the liquidus temperature in the tundish is 23–30°C. Experimental results confirmed the adequacy of the principles that were formulated and the effectiveness of the technological measures that were developed. © 2015 Springer Science+Business Media New York
Talanov O.P.,Bardin Central Research Institute for The Iron And Steel Industry |
Nastich S.Yu.,Bardin Central Research Institute for The Iron And Steel Industry |
Nikitin V.N.,Bardin Central Research Institute for The Iron And Steel Industry |
Denisov S.V.,Magnitogorsk Metallurgical Combine MMK |
And 5 more authors.
Metallurgist | Year: 2014
A technology is developed under MMK conditions for industrial production of steel 18KhGNMFTR plate 9-25 mm thick for platforms of heavy-duty quarry dump trucks and mining equipment. The set of mechanical properties is achieved by thermal improvement (double quenching and tempering) by which property stability is achieved with the formation of a uniform fine-grained martensitic microstructure. © 2014 Springer Science+Business Media New York.