372595894

36

PREPARATIONS

JPRS-UMS-92-003 16 March 1992

UDC 621.746.27.047

[AbstractJ A method to correct the titanium concentra-tion in pipę Steel 09G2BT and 10G2BT within a narrow rangę of 0.05-0.09 and 0.07-0.09% Ti, respectively during the steel-making process by adding powder wire to the intermediate ladle in the continuous casting machinę (MNLZ) is discussed and the titanium powder wire addition conditions are summarized allowing for the titanium composition in the ready product and its mean loss in the refining unit (UDM). For comparison, the titanium concentration in Steel after its treatment with FeTi in the refming machinę ladle and by adding titanium powder wire to a conventional intermediate ladle is tabulated and the method of correcting the titanium concentration in tubę Steel by adding titanium wire is summarized. An analysis shows that the titanium concentration in pipę Steel 09G2BT and 10G2BT decreases by 0.01% during its exposure in the ladle and during continuous casting; an addition of titanium powder wire to the intermediate ladle ensures a uniform titanium distribution throughout the slab length where titanium assimilation reaches 70-75%. It is shown that in correcting the titanium concentration, powder wire should be added at a differentiated ratę of 0.9 of the optimum in the beginning, 1.0 in the middle, and 1.1 at the end of the process. Tables 3.

Conductive Electromagnetic Metal Stirring During Continuous Slab Casting

927D0061E Moscow STAL in Russian No 12, Dec 91 pp 21-24

[Article by V.M. Niskovskikh, A.A. Smimov, V.V. Ryabov, V.P. Klak, Z.K. Kabakov, A.V. Larin, V.G. Dorofeyev, Uralmash Production Association, Central Scientific Research Institute of Ferrous Metallurgy, Novolipetsk Integrated Iron and Steel Works, and AM-Union Scientific Research Institute of Metallurgical Technology]

UDC 621.746.638.047

[Abstract] The use of inductive methods of electromag-nctic stirring (EMP) in order to improve the surface quality and intemal structure of cast metal and thui expand the rangę of brands and dimensions of products madę in continuous casting machines (MNLZ) and thełr shortcomings—primarily high energy outlays and the need for expensive equipment—are discussed and a new conductive electromagnetic stirring method (KEMP) which is free of these shortcomings ii introduced. The feasibility study, development, and physical modeling were performed by Yu.A. Samoylovich at the AlUUnion Scientific Research Institute of Metallurgical Technology. The design of a unit for conductive electromagnetic stirring of metal in continuous casting machines and the microstructure of samples from Steel Stsp pro-duced with and without conductive electromagnetic stlr-ring are presented. The distribution of nonmetallic indu-sions in carbon and Iow alloyed Steel cast with and without conductive electromagnetic stirring as well as the temperaturę fields and flow structure in the slab’s liquid core during the metal solidification with and without conductive electromagnetic stirring are plotted. The power reąuired by the conductive electromagnetic Stirring is 140-160 kW, which is lower than that of the inductive method by five- to sixfold. Full-scale tests show that the conductive electromagnetic stirring method makes it possible to expand the equiaxial crystal zonę by 40-50% and decrease the amount of nonmetallic inclusions by 30-40%. Figures 5; references 5.

Amorphous Precision Alloys: Technology, Properties, Applications

927D0061J Moscow STAL in Russian No 12, Dec 91 p 71-70

[Article by A.M. Glczer, A.G. Kozlov, Central Scientific Research Institute of Ferrous Metallurgy]

[Abstract] The fifth all-union conference organized by the Engineering Center of Amorphous and Microcrystal-line Materials at the Central Scientific Research Institute of Ferrous Metallurgy was held in Rostov Velikiy on 23-27 September 1991 and attracted close to 200 experts from the USSR as well as Bułgaria, Hungary, mainland China, Lithuania, Vietnam, Germany, and France. The conference addressed the issues of production processes, properties and structure, and applications of amorphous and microcrystalline materials. The effect of the melt State on the quality and properties and amorphous alloy strips was featured in a number of reports; considerable attention was focused on the problem of producing microcrystalline materials by rapid ąuenching in rollers. The use of nontraditional methods for producing amorphous and microcrystalline alloys was discussed. In addition to engineering problems, the issue of decreasing the cost of amorphous alloys was addressed. Several reports dealt with the issue of using amorphous alloys as magnetic, brazing structural, and corrosion-resistant materials. A new class of soft magnetic materials was discussed. The next conference is expected to be held in 1993.

Method of Maklng Wire From Low-Carbon Steel

927D00610 Moscow STAL in Russian No 12, Dec 91 pp 56-37

[Article by V.Ya. Chinokalov, V.P. Kołpak, V.Z. Sma-fcotlna, L.M. Poltoratskiy, Western Siberian Integrated Iron and Steel Works and Eastem Branch of the Ferrous

Metallurty Institute]

UDC 621.778.1:621.783.1

[Abstract) The shortcomings of process annealing of wires fbr cold upsetting are discussed and the results of studies to improve the technology of wire production