Conference on Thermal Hardening of Rolled Iron

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CHRONICLES CONFERENCE ON THERMAL HARDENING OF ROLLED IRON The conference, held in Dnepropetrovsk, June 14-16, 1966, was devoted to discussion of measures to fulfill the directives of the XXIII meeting of the CPSU on the f ive-year plan for the development of our national economy for 1966-1970 concerning the increased production of metals strengthened by heat treatment and thermomechanical treatment. More than 200 specialists from Moscow, Kiev, Dnepropetrovsk, and other cities attended the con- ference, which was held under the auspices of the Institutes of Ferrous Metallurgy, MChM, USSR, and other organizations. The participants heard 44 reports concerning the work being done on thermal hard- ening of rol led iron in plants and scient i f ic-research, educational, and planning institutes. K. F. Starodubov presented a general review in which he examined the theoretical and technological bases, recent developments, and prospects for further development of thermal hardening of rolled iron in the USSR and abroad. At the present time the properties of low-carbon steel result ing from thermal hardening have been sufficiently well investigated; the effect of high-temperature thermomechanical t reat - ment and the rate of cooling on the structure and properties of steel have been investigated; methods of achieving intense cooling of rolled products at high speed have been used; and equipment for thermal hardening of rol led iron in straight-l ine production which fits the existing roll ing mills has been con- structed. In recent years we have seen the development and improvement of the technology of thermal hardening of rolled iron under industrial conditions, the design and construction of experimental and ex- perimental- industr ial equipment and its adoption in industry, the production of industrial batches of ther- mally hardened rolled iron, testing by consumers, and the manufacture of commercia l structures and components from hardened rolled iron. During the present f ive-year plan the USSR must attain an industrial volume of production of ther - mally hardened rolled iron. Therefore, the most pressing problem is the construction of industrial equipment. A. V. Emel 'yanov and V. V. Krutenyuk (IChM) described their work on the development of the costs of thermally hardened rolled iron which would be mutually profitable both for the producer and the con- sumer. Additional payments for thermal hardening of a ton of reinforcing steels AT_IV and AT_ V are set at 5 rubles, AT_VI and AT_VI I at 6 rubles, rolled iron sections at 5 rubles, and plates at 7 rubles. The speakers proposed the establishment of a fund for awarding prizes by means of deductions from the additional profits obtained by plants as the result of the use of thermally hardened rolled iron and indi- cated the amounts of these deductions (10-20%). Yu. Z. Borkovskii, V. Ya. Savenkov, and V. T. Khudik (IChM), L. P. Stychinskii (Makeevskii Plant), and V. A. Satskii (Krivorozhskii Plant) reported on their work on thermal hardening of reinforcing steel, both small rounds and angle sections. Their plants have accepted delivery of industrial batches of equip- ment for heating during roll ing. I. E. Dolzhenkov (Dnepropetrovskii Metallurgical Institute), A. A. Sorokin (Dzerzhinskii Plant), and N. I. Beda (Petrovskii Plant) described the work being done at their plants on thermal hardening of small angles and medium section iron. S. N. Plyakov (IChM), P. D. Krishtafovich (Azovstal'), and Yu. E. Freidenzon (NTMK) presented the results of industrial tests of thermally hardened large unequal angles. These plants have made tests of equipment on which were developed the technological processes of thermal hardening of shaped sec- tions by the use of roll ing heat. Experimental batches of thermally hardened rolled sections have been sent to the institutes of the Office of State Construction, USSR, for investigation. The reports of T. V. Latin (TsNIIMPS), I. G. Uzlov (IChM), and T. S. Makaeva (NTMK) concerned thermal hardening of rai l road car and diesel wheels. At the Libknekht Plant and at NTMK they have con- Translated from Metallovedenie i Termicheskaya Obtabotka Metallov, No. 9, pp. 70-7], September, 1966. 763 structed experimental equipment for thermal hardening of seamless rol led wheels. The new technique~ which has improved all members of the wheels, involves interrupted quenching and tempering. Wheels produced by this technique have been sent to the TsNII MPS and Lyudinovskii and Luganskii Diesel Loco- motive Construction Plants for field tests. The report of N. F. Legeid (Ukraine Scient i f ic-Research Institute of Metals) concerned scientific research and experimental work on the technology of thermal hardening of roi led plate. The reports of L. G. Pozdnyakov (IChM), V. N. Bizyukin (Novomoskovskii Plant), G. P. Talalai, N. I Starushkin, and I. A. Podgaevski i (VNITI), and A. D. Kovaleva (Nikopol'skii Southern Chisel Plant), and A. F. Siukhin (DMetI) were devoted to thermal hardening of oil pipes and large-d iameter pipe for gas mains and trunk oil l ines. At present, a number of pipe plants have achieved large-sca le production of thermal ly hardened oil pipe made with exper imental equipment for hardening pipe 1020 mm in diameter. The report of Yu. V. Smirnov (UkrNIIM) concerned work done on thermal hardening of cold worked section iron and that of S. I. Shapovalov (Donetskii Polytechnical Institute) concerned wire rod. L .B . Tsa l 'man (Proektstal 'konstruktsiya) descr ibed thermal hardening of rigging bolts for steel structures. F. E. Rozental' (Ukrigipromez) presented information on the development of designs for a large number of apparatus for thermal hardening of reinforcing steel (small, medium, and large rounds), un- equal angles, plates, ra i ls , wheels, etc., in many metal lurgical plants of the USSR. V. K. F lorov (DMetI) investigated the effect of the major parameters of thermal hardening by ro l l - ing heat on the mechanical propert ies of low-carbon steel. He determined the hardenabil i ty of low-carbon steel by cooling at rates of 7-225 deg/sec. The report of V. A. Avramenko (E. O. Paton Welding Institute) and Yu. T. Khudik (IChM) concerned the degree of weakening of thermal ly hardened steel during electr ic welding. According to the data in this report , there is relat ively little weakening and it may be allowed for in designing welded structures. V. I. Zyuzin (VNIIMETMASh) gave the results of an investigation of the processes of thermal hard- ening of reinforcing steel. Of great interest were the reports f rom the consumers of thermal ly hardened rol led steel. E .A . Guzeev (NIIZhB) noted the great effectiveness of thermal ly hardened reinforcing steel in reinforced con- crete. P. I. Sokolovskii (TsNIISK) indicated the most effective uses of thermal ly hardened steel in metal structures and also indicated steels not weakening during welding. O. N. Vinkler (Proektstal 'konstruktsiya) pointed out the necessity of increasing the supply of thermal ly hardened structural steel components (plates and unequal angles). Ferroconcrete sections were described by V. V. Chudakov (Ryazanskii Association), E. M. Datsenko (Dneproenergostroi industriya Combine), S. Ya. Kosolapov (Donbasszhelezobeton Trust), and K. I. Korenev (DONNII Supermining Construction), who reported that the Vlasovskii , Dnepropetrovski i , and Ryazanskii Plants and also the Donetskii, Enakievskii , and Makeevski i Construction Combines have produced ex- per imental - industr ia l batches of reinforcing steel thermal ly hardened in metal lurgical plants by rolt ingheat. Short reports on cooling str ips on the ] 700 roll ing mil l at the I I ' ich Plant (A. E. Zakharov), the economic efficiency of hardening angle section iron (A. P. Chernovolova) and pipe (R. V. Shishatskaya) were rSade by these representat ives of institutes (UIM, DMetI, VNITI). In the resolutions of the conference it was indicated that the major problem now is the application of already developed technology, using the present designs of industrial equipment for thermal harden- ing. It is necessary to accept the additional payments for thermal hardening as well as measures for com- merc ia l stimulation of the process . It is necessary to designate machine construction plants which will special ize in the production of equipment for roll ing hardening. After the conference the part ic ipants examined experimental - industr ia l equipment for thermal hard- ening of reinforcing steel and experimental equipment for hardening small-size high-quality angle section iron at the Krivorozhskii Plant. 764