最新刊期
卷 37 ， 期 2 ， 2016
- 摘要：The test free-cutting stainless steel TBPS (/% : 0.02C, 0.75Si, 1.50Mn, 0.008P, 0.21S, 19.70Cr, 1.10Mo, 0.llPb, 0.008Te) is melted by vacuum induction furnace + electro-slag remelting (ESR)(Φ350 mm, 500 kg ingot) , and the relative hot plasticity of MnS inclusion in ESR ingot with deformation 10%-70% at 900-1200 °C has been tested and studied by Thermomechanical Simulator Gleeble 3800. The results show that at 900-1100 ℃ with increasing deformation the relative plasticity index γ of MnS inclusion decreases ； at 1200 °C the effect of deformation on the relative plasticity index γ of MnS inclusion is minor ； and with increasing the deformation temperature, the relative plasticity index γ of MnS trends towards decreasing, especially at 1200℃; the relative plasticity index γ decreases obviously. In order to decrease the elongation deformation of MnS to get better free-cutting performance, it available for steel TBPS to hot deform by larger pass deformation at higher temperature.关键词：Free-Cutting Stainless Steel TBPS;MnS Inclusion;Relative Hot Plasticity;Temperature;Deformation2|0|0更新时间：2026-01-21
- 摘要：The effect of quartz, wollastonite, fluorite and soda-ash on melting point, viscosity, crystallization temperature and critical cooling rate of mold powder has been studied by mold powder series (/% ：29-39 cement grog, 8 borax ,16-24 quartz, 11-19 wollastonite, 8-16 fluorite, 10-18 soda-ash) by different compounding mineral crude materials in lab. Test results show that with increasing basic mineral crude materials quartz and wollastonite content the melting point and viscosity of mold powder increase, and the effect of quartz on melting point and viscosity of mold powder is obviously more than that of wollastonite ； with increasing flux mineral crude materials fluorite and soda-ash, the melting point and viscosity of mold powder decrease, the effect of fluorite on decreasing viscosity is obvious and the effect of soda-ash on decreasing melting point is relatively larger ； with increasing the content of quartz, wollastonite and soda-ash the critical cooling rate of mold powder decreases, the crystallization temperature of mold powder decreases and the capacity of crystallization is weak； but with increasing quartz content the critical cooling rate increases, the crystallization temperature increases ,it shows that quartz has the effect to improve crystallization of mold powder. Finally it is obtained the optimum ingredient of mold powder for peritectic steel casting is (/ % )：37 cement grog, 8 borax, 20 quartz, 15 wollastonite, 10 fluorite and 10 soda-ash.关键词：Mold Powder;Mineral Crude Materials;Melting Point;Viscosity;Crystallization Temperature;Critical Cooling Rate2|0|0更新时间：2026-01-21
- 摘要：The iron-oxide scale total thickness and FeO layer thick percentage of 72A high carbon steel (0.67%-0.73% C) coils have markedly influence on coil stripping performance. With using artificial neural networks and mathematical method the BP network model is established to realize the complex non-linear mapping relationship between the cooling schemes during oxidation process of high carbon steel wire and the formed FeO layer thickness percentage after oxidation. Compared between measured parameters and network simulation results, it is obtained that the training accuracy of BP network is very high and has better generalization ability to quite well response the effect of each factor on FeO layer thickness percentage. The production application results show that based on BP network simulation results to improve cooling process, suitable decreasing wire laying-off temperature and increasing cooling speed at 850-720℃，the FeO layer thickness percentage of scale decreases in order to improve the mechanical peeling performance.关键词：High Carbon Steel 72A Coil;Peeling Performance;Artificial Neural Network;Cooling Scheme;FeO Layer Thickness Percentage3|1|0更新时间：2026-01-21
- 摘要：Key words:Bearing Steel GCr15,280 mm x 325 mm Bloom Casting,Mold, Multihole Nozzle,Numerical Simulation关键词：GCr15轴承钢;280 mm x 325 mm方坯连铸;结晶器;多孔水口;数值模拟4|0|0更新时间：2026-01-21
- 摘要：The desulphurization test of pretreated hot metal using four different structure active limes with specific surface area 1.891-2.664 m2/g and average pore diameter 575.5-814.9 nm is carried out in a high vacuum arc melting spinning quenching machine. The surface morphology of different lime sample is analyzed by scanning electron microscope and the specific surface area and the average pore diameter of lime are measured by a fully automatic mercury injection apparatus. Experimental results show that with increasing the average hole diameter, the desulphurization rate of hot metal decreases and with increasing the specific surface area the desulphurization rate increases ； the optimum ratio of desulphurization agent is 1：50, in this case the sulphur content in hot metal decreases to 0.001 % from 0.014%.关键词：铁水预处理;石灰;微观结构;脱硫率;脱硫剂配比2|0|0更新时间：2026-01-21
- 摘要：The deformation process of thin strip rolling by hot-rolled rod is simulated and tested by Φ130 mm two-high rolling mill in laboratory using Φ11 mm lead bar to replace hot-rolling rod. Result show that for thickness of thin strip is 1.2 mm the spread can increase by 35.37% by using longitudinal-rolling method, and with increasing the deformation, the change of spread is small； by using diagonal method with decreasing the bite angle the spread increases obviously, the imitate-defined spread formula △b =28.67- 0.26α is obtained, and with bite angle being 20° the width of thin strip is up to 36.12 mm, beside as rolling process is in range of small deformation, with accumulation of reduction the width of rolling piece increases linearly, it is available to get a feasible solution for production of thin-strip with big width-thickness ratio by hot-rolled rod.关键词：Rod;Diagonal Rolling;Spreading Formula;Thin Strip;Deformation Low6|0|0更新时间：2026-01-21
- 摘要：In order to reduce the defect such as comer crack of rectangular bloom and breakout to increase the quality of bloom, the study of optimization of mould flow field by changing nozzle angle of submerged nozzle has been carried out. The numerical simulation of liquid flow and solidification coupling process in mould for 150 mm x 380 mm rectangular bloom has been performed by using Fluent software to get the effect of nozzle angel (15°-30°) on surface flow rate, surface turbulent kinetic energy and impact depth. Results show that with increasing nozzle angle the average surface flow rate decreases, the impact depth increases being favourable to stabilize the liquid surface ； but with increasing nozzle angle, the liquid surface fluctuation is small, it is unfavourable to stirring liquid and removing inclusions in steel, and in this case the circle round region in lower part of mould is too low and the bloom shell is thinning easily forming breakout ； to sum up it is obtained that the suitable nozzle angle for 150 mm X 380 mm bloom casting is 25°. Application results obtain that the total inclusion numbers with using optimized nozzle decrease by 36%.关键词：150 mm x380 mm Rectangular Casting Bloom;Nozzle Angle;Mould;Flow Field;Numerical Simulation2|0|0更新时间：2026-01-21
- 摘要：The control technology of inclusions in steel for tyre cord and saw wire in "BOF-LF refining-Bloom CC" process is summarily reviewed. The plasticization of inclusions in steel is realized by using the measures including using Si- Mn deoxidation, strictly controlling Als content in liquid and refining with low basicity (CaO/SiO2≤1.0) slag. Production practice shows that the plasticization of inclusions in steel is not fully equal to controlling inclusion in low-melting point region, at some steelworks the MnO-SiO2-Al2O3series inclusions in coil for saw wire are not controlled in low-melting point region but these inclusions are nicely deformable during rolling process. The exogenous inclusions caused by refractories should be avoided in production process and the frequency of wire breakage could be remarkably reduced by changing the Al2O3based refractories used in casting process into non-Al2O3based refractory materials.关键词：BOF-LF-CC Flowsheet;Tyre Cord and Saw Wire;Inclusions;Si-Mn Deoxidation;Als;Top Slag Refining;Refractories2|0|0更新时间：2026-01-21
- 摘要：The Production flowsheet for steel 12Cr2Mo, 14CrMo and 15CrMo is metal-110t BOF-LF-VD-300 mm x (1700-2400) mm slab CC process. The effect of factors including carbon content in steel, Mn/S, mold inverted taper and immersion nozzle insertion depth on casting slab longitudinal cracks is analyzed. By optimizing the mold inverted taper from before optimization 1.10 for three kinds of steel to 1.20 for steel 12Cr2Mo, 1.15 for steel 14CrMo and 1.10 for steel 15CrMo, adjusting the immersion nozzle insertion depth from original 170-180 mm to 140-150 mm, and using lower viscosity mold powder (basicity 1.25, viscosity 0.129 at 1300℃) to increase the flux flowability, the casting slab surface longitudinal cracks defect is effectively controlled, the longitudinal cracks occurred rate decreases from original 8.9% to 3.2% after optimization.关键词：0.12%~0.16%C铬钼钢;300 mm连铸板坯;表面纵裂;保护渣;结晶器倒锥度;浸入式水口;工艺优化2|0|0更新时间：2026-01-21
- 摘要：The metallurgical flowsheet for steel S355NL for wind power flange (/% : 0.14-0.48C, 0.15-0.40Si, 1.30-1.60Mn, ≤0.013P, ≤0.005S, 0.04-0.12V, 0.03-0.05Nb, ≤0.009Ti, ≤0.30Cr, ≤0.50Ni, ≤0.20Cu, ≤0.10Mo, ≥0.020Alt) is 100t UHP EAF-LF-VD-Φ650 mm, Φ800 mm bloom CC process. The results of analysis on unqualified steel by nondestructive examination due to 1-2 mm cracks show that cracks are mainly caused by alumina inclusions and casting bloom porosity defects. By the process measures including feeding calcium wire 0.45 kg/t at end LF, increasing VD treading time to 27 min from original 25 min, decreasing the [N] in steel to 78 x 10-6-82 x10-6the [H]to 1.1 x10-6-1.3 x10-6and the [O] to 12 x10-6- 15 x10-6decreasing the soft argon blowing rate to 2 x 20 L/min from 2 x 25 L/min, time≥12 min and decreasing the liquid overheating extent by 5℃ , the qualified ratio of steel forged from casting bloom is more than 99%.关键词：Steel Wind Power Flange;S355NL;Ultrasonic Nondestructive Examination;Cracks;Process Improvement2|0|0更新时间：2026-01-21
- 摘要：Medium carbon sulphur free-cutting steel SAE1144 (/%： 0.42-0.47C, 0.15-0.30Si, 1.45-1.65Mn, 0.24-0.30S, ≤0.025P) is produced by 100t DC EAF-LF-VD-280 mm x320 mm bloom casting process. With process measures including controlling tapping ladle temperature m 1 000adding 200 kg ferrosilicon during tapping, ladle bottom argon blowing stirring, using LF special refining slag series (/% ： 45-55CaO,15-25Al2O315-25SiO2), feeding sulphur wire, controlling liquid overheating extent 20-35 °C after VD treatment for ≥15 min, controlling secondary cooling water rate 0. 18 L/kg and casting rate 0.45-0.55 m/min, the sulphur content in liquid and castability of liquid are stably controlled, and the rating of central porosity and shrinkage cavity is ≤1.5, [O] is 14 x 10-6-15 x10-6and [H] is 1.3x10-61.5 x10-6to meet the requirement for nonmetallic inclusions and quality.关键词：Sulphur Free-Cutting Steel;SAE1144;100t DC EAF-LF-VD-CC Flowsheet;Process Practice5|0|0更新时间：2026-01-21
- 摘要：It is obtained by statistics that the fluctuation of mechanical properties of annealed 126 coils 3 mm hot- rolled steel SUS410L (/%： 0.02C, 0.98Si, 0.99Mn, 0.018P, 0.022S, 12.44Cr, 0.025N) strip annealed with strip temperature 840 °C. and strip-line running speed 50 m/min is larger, that is tensile strength 551-673 MPa and elongation 16%-28% , caused the strip breaking accident during continuous cold-rolling process. During annealing by using reasonable leading strip length and decreasing the TV value (thickness of strip x strip-line running speed) from 150 to 120 (strip- line running speed 40 m/min) , the fluctuation of strip mechanical properties is smaller, that is tensile strength 593-639 MPa and elongation 20%-22% , it is available to carry out the cold-rolling process.关键词：Stainless Steel SUS410L;Hot-Rolled Strip Coil;Tensile Strength;Elongation;Annealing Process Optimization;Continuous Cold-Rolling2|0|0更新时间：2026-01-21
- 摘要：The effect of [N] , [O] and liquid temperature on tantalum yield of steel MHT10Ta is analyzed by commercial test. The results of pilot 9 heats commercial production show that with melting in EAF by oxidation method, deoxidizing in LF by G powder, VOD refining vacuum ≤67 Pa for ≥15 min, VHD heating insuring Al content in steel ≥0.02% , liquid temperature 1635-1645°C , Ar flow rate 100 L/min, adding tantalum bar 0.125% , inserting Fe-B according 0.01% content before tapping, tapping temperature 1580-1595℃ and Ar shielding casting； the tantalum content in finish products of steel MHT10Ta is 0.08%-0.105% , the yield of tantalum is up to 60% by process optimization.关键词：MHT10Ta;30t EAF-LF-VOD/VHD;Tantalum;Yield;Process Practice2|0|0更新时间：2026-01-21
- 摘要：The crack phenomenon of cold-drawn Φ12 mm bar of low-carbon high-sulphur free cutting steel (/% : 0.07 C, 1.24Mn, 0.06P, 0.39S) produced by 100t BOF-LF-165 mm x 165 mm casting billet -Φ14 mm hot-rolled bar-cold drawn to Φ12 mm rod process has been systematically analyzed to get the main cause of cold-drawn rod longitudinal crack is the billet inner defect formed in steelmaking and casting process by slag enclosure and oxidation etc factors. With the process measures including controlling mold cooling water rate in casting process, using weak secondary water cooling process with ratio water amount 0.83 L/kg, casting speed 1.5 m/min, non-oxidizing shielding casting and using viscosity 0.6 Pa·s at 1300℃ specialty mold powder, the occurrence of cold-drawn rod longitudinal crack is effectively avoided.关键词：Low-Carbon High-Sulphur Free Cutting Steel;Cold-Drawn Rod;Longitudinal Crack2|0|0更新时间：2026-01-21
- 摘要：According the issue of nitrogen content in key steel grades being on the high side at Pangang, by survey and study it is defined that the main factors led to nitrogen being on the high side are the LD end nitrogen content in liquid being on the high side, serious pick-up of nitrogen during tapping and serious pick-up of nitrogen in the process from end refining to tundish, and the key technique to control o£ nitrogen in liquid is put forward including "LD low nitrogen blowing" ,"two-step deoxidation to control pick-up of nitrogen in tapping process" and "double argon sealing long nozzle shielding casting" etc. technique, it shall be to control the average LD end nitrogen in liquid no more than 13 x 10-6and the average pick-up of nitrogen in liquid during tapping and end refining process to tundish no more than 5 x10-6. Application results show the nitrogen content in finished products of beam steel slab, electrical steel and IF steel is respectively 30.3 x10-618.2 x10-6and 16.3 x10-6and the average nitrogen content in finished products of heavy rail steel and tire cord steel is respectively 40. 8 x 10-6 and 38.2 x10-6to greatly improve the control level of nitrogen content in low-ni- trogen steel grades at Pangang.关键词：120t LD-LF-RH-CC Flowsheet;Control of Nitrogen Content in Steel;LD Endpoint;Pick-up of Nitrogen;Long Nozzle2|0|0更新时间：2026-01-21
- 摘要：The static recrystallization behavior of steel 30CrMo 60 mm casting slab in interval between double-pass of hot deformation has been tested and studied by Thermecmastor-Z thermal simulator and double-pass compressed method to analysis the effect of temperature (1000 ~ 1150℃),deformation (0.1-0.22) , strain rate ( 0.1-10 s-1) and inlerval between passes (1-80 s) on static recrystallization. Results show that the static recrystallization of steel 30CrMo is improved with increasing temperature, deformation, strain rate and interval between passes ； the static recrystallization activation energy of steel 30CrMo is 184.45 kJ/mol ； a static recrystallization kinetic model is established based on experimental data and the predicted data better meet the experimental data.关键词：Steel 30CrMo;60 mm Casting Slab;Double-Pass Compression;Static Recrystallization;Kinetic Model2|0|0更新时间：2026-01-21
- 摘要：The 980 MPa hot rolled corrosion-resistant rail steel U68CuCr (/% ： 0.65-0.75C, 0.40-0.80Si, 1.00-1.30Mn, ≤0.030P, ≤0.025P, ≤0.50Cu, ≤0.50Cr, ≤0.05Nb) is developed by defined the chemical composition and the desulphurized metal-120t top and bottom combined blown converter-argon blowing- LF-RH-280 mm x 380 mm bloom casting-rolling process. Test results show that the tensile strength of corrosion-resistant rail steel U68CuCr is ≥1060 MPa with elongation ≥12% , the hardness HB value of rolling face is 300-310, the interlamellar spacing of pearlite is 0.2 μm, and the wear resistance is better than that of U75V rail steel with same strength rating. The results of 2% NaCl corrosion test show that the corrosion rate o£ rail steel U68CuCr is 57% of that of rail steel U75V. The corrosion-resistant steel U68CuCr rail has better serve performance in Beijing-Guangzhou railway line for 3 years with gross transporting load 0.3 billion t, and all properties of steel U68CuCr rail meet the requirement of rail.关键词：980 MPa Corrosion-Resistant Steel Rail;Steel U68CuCr;Development;Properties;Service2|0|0更新时间：2026-01-21
- 摘要：Test pipeline steel (/%： 0.04-0.05C, 0.20-0.24Si, 1.80-1.88Mn, 0.010-0.012P, 0.004-0.005S, 0.27-0.30Cr, 0.42-0.46Ni, 0.24-0.28Mo, 0.20Cu, 0.005V, 0-0.017Y, 0.0031 -0.0053O) is melt by a 10 kg induction furnace and rolled to test bar. The effect of rare earth yttrium on corrosion resistance of pipeline steel in simulated seawater (3.5% NaCl) is studied by using scanning electron microscope and energy spectrum analysis, electrochemical techniques and thermodynamics calculated method. Results show that the rare earth has modification effect on inclusions in steel to modify the large scale and spinel structure Al2O3inclusions to small spheroidal rare earth compound inclusions； therefore it is favorable to form the continuous and compact inner rust layer, decrease the pitting corrosion source and increase the corrosion resistance of steel.关键词：Rare Earth Yttrium;Pipeline Steel;Seawater;Corrosion Resistance;Electrochemical Technique;Thermodynamics Analysis;Inclusions4|0|0更新时间：2026-01-21
- 摘要：The test 0.42% Cu Hi-B steel (/% : 0.10C, 3.25Si, 0.16Mn, 0.019P, 0.011S, 0.021 Als, 0.42Cu ) is melted by induction furnace at laboratory and cast to 15 kg ingot, broken down to 60 mm billet then hot-rolled to 3.95 mm plate. The tested specimen is 0.48 mm sheet cold-rolled by 88% reduction and annealed at 830 °C, 850 °C and 870 °C for 3 min, 5 min and 7 min. The metallographic examination and texture analysis of annealed specimens are carried out. The test results show that the average grain size of specimen annealed at 850 °C for 5 min is 14.49 μm, with deviation angle 15° the content of {111}＜112＞、{111}＜110＞ etc favourable textures is more, while the content of {001}＜110＞、{110}＜112＞ etc unfavourable textures is less. The optimized primary recrystallization annealed process of the test cold-rolled sheet is at 850 °C for 5 min.关键词：CSP;Simulation;0. 42%Cu;Hi-B Steel;Cold-Rolled Sheet;Annealing;Texture;Structure2|0|0更新时间：2026-01-21
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