最新刊期
卷 33 ， 期 2 ， 2012
- 摘要：A study on liquid flow field, temperature field and flow characteristics in a 40-50 t tundish with different structure for 4-strand 410 mm x 530 mm bloom caster at steel works has been carried out by using geometric similarity 1：3 water model to get optimum flow control devices. Research results show that in order to meet the requirement of flow field in tundish for 4-strand bloom, the optimized best flow control device for the tundish with channel type induction heating unit is different from that for the tundish without channel type induction heating unit. For the tundish without channel type induction heating unit, by using the optimum scheme i. e. the combined flow control method of turbulent flow control device + "V" type retaining wall with deflector hole + dam, the response time and average residence time of the flow closer to nozzle are prolonged, the flow pattern of each nozzle is consistent, the liquid flow characteristics in tundish are obviously improved. The practice in production of steel 40Cr shows that continuous casting heats are up to 8 heat, extreme temperature different between each strand decreases to 4 T and T[O] in liquid in tundish is about 10 x 10-6关键词：Bloom;Tundish;Induction Heating;Phsical Simulation;Metallurgical Effect4|0|0更新时间：2026-01-21
- 摘要：Calcium granules in liquid steel easy float up. With definite temperature of liquid in ladle, as depth of feeding calcium in liquid is larger than a critical depth, the static pressure of liquid shall inhibit calcium vapourizing, so the yield of calcium shall increase obviously. Based on the fluid dynamics principle, the gas rotary feeding wire lance with gas orifice separating from wire orifice and using gas rotary to revolve liquid steel has been designed and the feeding wire water simulation test is carried out. Test Results show that the circuiting flow at longitudinal and lateral direction is produced in liquid steel by using gas rotary feeding lance to prolong the residual time of calcium in liquid that promote calcium mixing with liquid, it is available to increase the yield of calcium.关键词：Calcium Treatment;Wire Feeding Unit;Wire Feeding Lance2|0|0更新时间：2026-01-21
- 摘要：A three-dimensional math model of electromagnetic stirring of mold for 380 mm x 280 mm bloom casting is established by using finite element analytic software and the effect of electromagnetic stirring parameters (current intensity 200-500 A, frequency 1.5-3.0 Hz, thickness of mold copper plate 34-40 mm) on distribution of magnetic field in mold is systematically studied. Results show that the max magnetic induction intensity is at center of axis direction of strand and the lower values of magnetic induction intensity are at top and bottom of mold ； with increasing current intensity from 350 A to 500 A, the magnetic induction intensity at center of stirrer increases linearly ； with increasing current frequency from 1.5 Hz to 3.0 Hz, the magnetic induction intensity at center of strand decreases only by 0.0015 T； and with increasing thickness of mold copper plate, the magnetic induction intensity at wide surface, narrow surface and comer of the strand all decreases. In actual casting heavy rail steel U71Mn process, current intensity should be more than 400 A.关键词：380 mm x 280 mm Casting Bloom;Mold;Electromagnetic Stirring;Numerical Simulation2|0|0更新时间：2026-01-21
- 摘要：An analysis on fluid flowing status in a 60 t tundish with different dam structure for two-strand slab casting at Steel Works has been carried out by using geometric similarity ratio 0. 4 water model and Fluent math model. Results show that with using original structure- 200 mm height non-hole dam in tundish, the condition of liquid flow close to bottom of tundish is serious, and because of low dam, the effect of liquid lifting upward is not obvious, it is not available to remove inclusions from liquid and form large dead zone in casting area. As the height of dam increases to 270 mm with two upward 15° round hole, the minimum residence time of liquid in tundish increases by 12.5% , the dead zone decreases by 36% , the liquid flows toward surface of liquid in casting area, the dead zone in casting area and different temperature layer appearance basically disappear.关键词：Tundish;Water Model;Math Model;Flow Field2|0|0更新时间：2026-01-21
- 摘要：The tapping process of a 50 t converter is simulated by using commercial software Fluent 6. 3 and based on pressure separated implicit analytic calculation and k-e bi-equation, and the simulation results is compared with the results of physical simulation with geometric similarity ratio 1: 4 water model. Results show that the numerical simulation results are compared to water model simulation results, because of neglecting the interaction of friction between liquid and wall face in numerical model, the vortex forming time and tapping time obtained by numerical simulation are less than that obtained by water model simulation； at current structure of tapping hole, the slag entrained by vortex during tapping is inevitable, and the vortex formed is most at middle and later period of tapping.关键词：Converter;Tapping;Vortex Forming Period;Numerical Simulation;Water Model7|0|0更新时间：2026-01-21
- 摘要：The numerical simulation and analysis on temperature field, stress-strain field and rolling force for关键词：Steel 82B;Software ABAQUS;Numerical Simulation;Pre-finishing Rolling;Temperature Field;Thermo-Mechanical Coupling;Front-Sliding2|0|0更新时间：2026-01-21
- 摘要：The austenite-ferrite duplex stainless steels have stable austenite phase and ferrite phase structure that have higher mechanical properties and excellent pitting, intergranular corrosion and stress corrosion resistance, therefore the steels are wide applied in manufacture of equipment for nuclear power station. In general the volume fraction of ferrite phase in casting of duplex stainless steels is ≤ 20% with service temperature less than 425 ℃ , and the volume fraction of ferrite phase in forgings of duplex stainless steel is about 50% with service temperature less than 250 ℃. The chemical composition, manufacture and welding process, and structure and properties of casting and forgings o£ duplex stainless steels applied in equipment for nuclear power station are presented in this article.关键词：Equipment for Nuclear Power Station;Duplex Stainless Steel;Casting;Forging;Application2|0|0更新时间：2026-01-21
- 摘要：The process for 0.30 mm sheet of conventional grain-oriented silicon steel (/% ： 0.03-0.05C, 3.0Si, 0.065-0.080Mn, 0.004-0.007P, 0.018-0.025S, 0.02Cu) produced by two-stage fold rolling and inter annealing from 2.20-2.30 mm hot rolled plate has been studied to focus analysis on the effect of chemical composition ( C, Mn, S, P) , heating temperature ( 1350-1400 °C and 1200-1320 °C ) , use of normalizing process, second cold rolling reduction (56%-62% ) and secondary recrystallization temperature (900-1000 °C ) on iron loss P17and magnetic induction B8of conventional grain-oriented silicon steel. Results show that the effect of chemical composition, heating temperature and secondary recrystallization temperature on magnetic properties of conventional grain-oriented silicon steel is obvious, and the normalization process and cold rolling process plate thickness on magnetic properties of steel is not appreciable ； for conventional grain-oriented silicon steel the suitable range of chemical composition is (/%：) 0.03-0.05C, 2.9-3.1Si, 0.05-0.10Mn, 0.015- 0.03S, the heating temperature for hot rolling is 〜1380 °C , finishing rolling at 930 ~ 960 °C , secondary recrystallization temperature 〜950 °C .关键词：普通取向硅钢;化学成分;二次再结晶温度;磁性能6|0|0更新时间：2026-01-21
- 摘要：The hot tensile test of Φ10 mm x 30 mm cylinder specimen of low alloy steel Q345B with true strain 0.15 and strain rate 0.001-0.1 s-1at 450-650 ℃ has been carried out by Gleeble-1500 thermal test machine. Results show that with low strain rate at lower temperature the deformation resistance is at elastic-piastic deformation stage and its linear section is longer, and as deformation is larger than 0. 06, the apparent plastic deformation of steel occurs and the change rule of deformation resistance is basically similar to that at higher temperature. Based on test data the math model for deformation resistance of steel Q345B is established by using Origin software with multivariate nonlinear regression. The straightening force of 9 rolls straightener for medium and heavy plate is calculated by using this model combined with straightening theoretical equation, the relative error of calculated results are 0.01%-6.17% .关键词：Hot Simulation;Low Temperature Deformation Resistance;Math Model;Straightening Force2|0|0更新时间：2026-01-21
- 摘要：According to location and morphology of intermediate cracks occurred in macrostructure of 0.20C steel 4>300 mm round casting bloom and combining with analysis on casting equipment and process, it is obtained that with uneven shell thickness formed in mold, larger fluctuation of hydraulic force of withdraw straightening stands on bloom, the intermediate cracks along intergranular boundary form in bloom under action of heat stress and straightening stress. With improving the quality of mold softened water and secondary water for casting, decreasing superheating extent of liquid from 25-35 °C to 20-30 °C , decreasing mold electromagnetic stirring current from 550 A to 350 A, stabling the hydraulic force, and straightening bloom temperature ≥ 950 °C , the intermediate cracks in round casting bloom are eliminated.关键词：Φ300 mm Casting Round Bloom;Intermediate Cracks;Straightening Force4|0|0更新时间：2026-01-21
- 摘要：The Φ130-170 mm bar of steel SAE4137M for petroleum drill pipe connecting sleeve (/% : 0.35-0.38C, 0.15-0.35Si, 0.85-l.00Mn, ≤ 0.015P, ≤ 0.008S, 0.90-1.20Cr, 0.28-0.33Mo，≤ 0.005Ca, ≤ 0.0090N) has been pilot-produced by hot metal pretreatment-150 t top and bottom combined blown converter-LF-RH-350 mm x 470 mm casting with M-EMS-continuous rolling process at Bengang. With adding compound deoxidizer during converter tapping, diffusion deoxidizing with argon stirring in LF refining, soft argon blowing and strict-controlling feeding calcium wire amount in RH refining, and controlling liquid overheating extent within 20-30 ℃ , in steel products the oxygen content is (13-15 ) x 10-6hydrogen content (0.4~0.5) x 10-6nitrogen content (35-44) x 10-6residual calcium content ( 12-18) x 10-6and Al/N is ensured ≥ 2, that all meet the requirement for petroleum steels关键词：150 t BOF-LF-RH-CC Flow Sheet;Steel SAE4137M for Petroleum Drill Pipe Connecting Sleeve;Pilot Production2|0|0更新时间：2026-01-21
- 摘要：The austenite dynamic recrystallization process of V-Ti microalloying non-quenching- tempering steel 38MnVS (/% : 0.42C, 0.76Si, 1.33Mn, 0.011S, 0.013P, 0.10V, 0.02Ti) has been studied. The effect of deformation temperature (950-1150 °C ) and strain rate (0.1-10 s-1) on austenite dynamic recrystallization of steel 38MnVS is studied by Gleeble-3800 thermal simulation test machine, and the function related Zener-Hollomon parameter, dynamic recrystallization size model and dynamic recrystallization diagram are established. Results show that the higher deformation temperature and the lower strain rate, the smaller critical driving force to occur dynamic crystallization and the easier to carry out dynamic recrystallization: the activation energy Qdfor dynamic crystallization of microalloying non-quenchine-tempe- ring steel 38MnVS is 275.453 kJ/mol.关键词：Non-Quenching-Tempering Steel 38MnVS;Austenite;Dynamic Recrystallization;Activation Energy2|0|0更新时间：2026-01-21
- 摘要：The effect of two kinds of forming pressure- 11.54 MPa and 9.23 MPa on microstructure and magnetic properties of Nd-Fe-B magnet has been studied at production line for Φ9. 5 mm sintered Nd-Fe-B magnet (/% ： 31.00Pr + Nd, 1.20B, 0.20Al, remainder Fe) manufactured by dry process. Results show that with increasing forming pressure the unevenness of grain size distribution is improved and the grain orientation increases in order to increase remained magnetic induction intensity and magnetic energy product of sintered magnet ； but with increasing forming pressure the grain size increases in order to decrease the intrinsic coercive force of magnet.关键词：Sintered Nd-Fe-B Magnet;Forming Pressure;Grain Size;Magnetic Properties2|0|0更新时间：2026-01-21
- 摘要：The quenching examination of Φ26 mm rod of steel 60Si2CrVAT (/% : 0.60C, 0.63 Mn, 1.50Si, 1.08Cr, 0. 14 V) at 870 - 950 °C is simulated by DIL850L phase transition instrument with Φ4 mm x 10 mm small specimen. Simulated test results show that with quenching temperature increasing, the residual carbide in steel decreases, and quenching at 950 Y the grains coarsen obviously, therefore the selected optimum heating temperature for quenching is 910 °C. In condition of production examination, with optimum heat treatment process i. e. quenching at 910 °C for 40 min and tempering at 420 ℃ for 90 min, it is available for steel to get optimum comprehensive mechanical properties i. e. tensile strength Rm- 1 940 MPa, yield strength Rp0.2- 1 740 MPa, elongation A5- 9. 5% and reduction of area Z- 36.5% .关键词：高强度弹簧钢60Si2CrVAT;淬火;回火;力学性能3|0|0更新时间：2026-01-21
- 摘要：The corrosion resistance of 3 mm sheet of steel Corten A (/% : 0.59C, 0.16Si, 0.31Mn, 0.14P, 0.009S, 0.49Ni, 0.52Cr, 0.35Cu) and steel Corten Cr2 (/% : 0.59C, 0.16Si, 0.30Mn, 0.14P, 0.012S, l.00Ni, 1.94Cr, 0.36Cu) is studied by using accelerated corrosion test salt fog chambers and measuring alternating current (AC) impedance method, and the structure morphology, analysis and corrosion resistance mechanism of rust layer and matrix are analyzed by using scanning electron microscope and energy dispersive spectrometer. Results show that with etching in 5% sodium chloride fog for 120 h, the average corrosion rate of steel Corten Cr2 is 65. 86% of that of steel Corten A ； the Cr atom percentage and chromium oxide rich extent at surface of corrosion layer and plate surface of steel Corten Cr2 are higher than that of steel Corten A.关键词：Corten Cr2耐候钢;5%氯化钠;盐雾;耐腐蚀性;Cr含量5|0|0更新时间：2026-01-21
- 摘要：The effect of original structure of 27.5 mm hot rolled plate ( hot rolled status, 850 °C annealed, 950℃annealed) on evolution of texture of cold rolled status and 870 T annealed 0. 5 mm cold rolled non-oriented silicon steel 50W600 sheet (/% : 0. 004C, 0. 33Si, 0. 38Mn, 0. 099P, 0. 007S, 0. 32A1) has been studied. Results show that after cold rolling the texture density of{100}< 011 > and{112}< 110 > in texture of cold rolled sheet increases obviously, and the texture density of sheet cold-rolled by non-annealed hot rolled plate is larger than that cold-rolled by annealed hot rolled plate ； in texture of recrystallization annealed sheet cold-rolled by non-annealed hot rolled plate, the main texture is{100}〈011〉、{110}〈011〉and {111}〈112〉while in texture of recrystallization annealed sheet cold-rolled by annealed hot rolled plate, besides{100}〈011〉and {110}〈011〉there is higher density Goss-texture.关键词：Non-Oriented Silicon Steel;Original Structure of Hot Rolled Plate;Cold Rolled Sheet;Recrystallization Annealing;Texture4|0|0更新时间：2026-01-21
- 摘要：Rare earth element ( RE) wire is fed to electric steel liquid (/% : ≤ 0.005C, 2.0-2.6Si, 0.20-0.30Mn, 0.008P, 0.001-0.009S, 0.15-0.40Al, ≤0.0010[O] ) in mold by auto feeding wire machine through a side tube at 220 mm x 1 280 mm curved caster. Effect of rare earth element content (0-0.45% RE) on structure and texture, morphology and distribution of inclusions, and magnetic performance of 0.5 mm annealed cold rolled non-oriented electrical steel products is systematically studied by optical and electric microscope. Results show that 0.008%-0.020% rare elements in steel, it is available to effectively control the harmful effect of fine inclusions in steel, promote increasing of grain size of annealed products, to intensify favorable texture ingredient and obviously improve magnetic performance of cold rolled non-oriented electrical steel products.关键词：稀土;无取向电工钢;组织;织构;磁性能6|0|0更新时间：2026-01-21
- 摘要：Observation of microstructure of X80 pipeline steel (/% : 0.043C, 0.25Si, 1.86Mn, 0.085Nb, 0.00lTi, 0.028Al, 0.0027N) has been carried out by using environmental scanning electron microscope, and characteristics of structure and grain-texture orientation of the pipeline steel are analyzed by X-ray diffraction ( XRD) and electron backscatter diffraction ( EBSD) technique. Results show that with increasing{112}〈110〉、{110}〈110〉orientation and small-angle boundary ratio, the pipeline steel's drop weight tear test ( DWTT) shearing area ratio enlarges and the toughness of steel increases； with decreasing finishing rolling temperature and increasing cooling rate after rolling, it is a- vailable to get more acicular ferrite and favlurable to DWTT performance.关键词：X80 Pipeline Steel;Rolling Process;Structure;Texture;Properties2|0|0更新时间：2026-01-21
- 摘要：The 3% Si steel (/% : 0.067C, 3.09Si, 0.34Mn, 0.007P, 0.003S, 0.70Cu, ≤0.005Al, 0.0080-0.0120N) is melted by a 50 kg vacuum induction furnace and hot rolled to 3.5mm plate by 6 pass with finishing rolling at 850 Y and coiling at 650 °C by laboratory mill, then normalized hot rolled plate is cold rolled to 0.5 mm sheet by 4 roll reversing mill with 6 passes. Analysis results show that at surface region of hot rolled plate there are mainly random distributed larger equiaxial grains, the center area consists of fine equiaxial grains and lath shape grains and the strong rotating cube texture {001}〈110〉components occur in center area； After cold rolling, the strong a and y textures occur at surface region and the hot rolled {001}〈110〉rotating cube textures are retained in cold rolled sheet.关键词：3% Si Steel;Hot Rolling;Cold Rolling;Structure;Texture;Evolution2|0|0更新时间：2026-01-21
- 摘要：Dilatation curves of C-Mn-Si series low carbon （/% : 0.11C , 1.15Si, 1.85Mn, 0.032A1, 0.003Ti, 0.002 4N） and medium carbon （/% ： 0.35C, 1.1 ISi, 1.82Mn, 0.041 Al, 0.002Ti, 0.004 2N） bainite steel continuous cooling with cooling rate 0.5 ~ 30 ℃/s have been measured by using thermal dilation method and metallographic examination with the Gleeble-1500 hot simulation machine to define the phase transformation points, and combined with microstructure observation, the continuous cooling transformation （ CCT） curves of two steels are respectively plotted by Origin software. Results show that with cooling rate ≤ 1 °C/s, the structure of 0. 11% C steel is ferrite + bainite + martensite, as cooling rate ≥ 2 °C , its structure is bainite + martensite, and with cooling rate ≥ 0.5 °C/s the 0.35% C steel has bainite 4- martensite structure ； with increasing carbon content, the transformation temperature of bainite and martensite all decreases.关键词：C-Mn-Si系贝氏体钢;C含量;CCT曲线;相变点;组织2|0|0更新时间：2026-01-21
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