最新刊期
卷 36 ， 期 5 ， 2015
- 摘要：The two dimensional numerical model is established with adding shrouding gas holes around traditional lance oxygen Laval tube for a 90 t LD injecting auxiliary oxygen to protect main oxygen jet and form coherent state, of traditional oxygen lance and coherent lance the oxygen jet velocity distribution at jet axis and the flow characteristics of liquid steel and impact depth in pool with different lance level are analyzed. Results show that as compared with traditional oxygen lance at same lance level the attenuation of jet of coherence oxygen lance is slower, the impact force is stronger and the depth of impact pit is deeper； with lance level 30De (De-diameter of oxygen lance outlet) the max impact depth of coherent lance is just the same that of traditional lance with lance level 20De and the average impact depth of coherent lance with lance level 40De is corresponding to that of traditional lance with lance level 20De.关键词：Coherent Jet Oxygen Lance;90 t LD;Pool;Liquid Steel;Impact Depth;Numerical Simulation4|0|0更新时间：2026-01-21
- 摘要：According to an object of study on mould for continuous casting 950 kg/min H-beam bloom, with using established three dimensional geometry models by FLUENT software the casting speed (0.6-1.2 m/s) with nozzle submerged depth 125 mm and 175 mm on transferring characteristics of liquid steel in mould has been simulated and studied. Results show that with different casting speed the patterns of liquid steel flow in mould for H-beam bloom are similar, but with increasing casting speed the jet impacting depth of liquid steel and the flow velocity of liquid at free surface in mould increase, the melting status of mould powder is tending to improvement, and the fluctuation of liquid free surface in mould and the impact effect of liquid flow on solidified shell are tending to increase. While with increasing casting speed, removal ratio of inclusions with different sizes from liquid all decreases, among them the removal ratio of large-sized inclusions decreases markedly, as the casting speed increases from 0.6 m/min to 1.2 m/min the removal ratio of 100 μm inclusions decreases from 16% to 10% , and in simulating condition the removal ratios of 20-100 μm inclusions are 4% to 16%.关键词：H-Beam Bloom Casting;Mould;Transferring Characteristics of Liquid Steel;Numerical Simulation2|0|0更新时间：2026-01-21
- 摘要：The dynamic mechanisms about slag skim during top lance blowing gas skimming slag process are analyzed by 1 ：6 water model test, and the effect of blowing gas rate ( 10-30 L/min) , lance submerged depth (90-270 mm) and lance location ( distance from edge 0-160 mm) on slag skimming results has been tested and studied. Results show that with increasing blowing gas rate and top lance submerged depth and reducing the distance between the submerged location of lance and the hot metal ladle back wall, the results of slag skimming are obvious improvement , it is available to skim slag on hot metal. Commercial application pilot production results show that with using top-blowing auxiliary skimming slag process the slag skimming time is markedly reduced, but the iron loss is not obvious decrease, it needs to further optimize process parameters.关键词：100 t Hot Metal Desulphurization;Slag Skimming;Top Blowing;Water Model Simulation Examination;Application5|0|0更新时间：2026-01-21
- 摘要：The rolling force of Q235 steel (/% ：≤0.22C, ≤1.40Mn, ≤0.35Si) at each pass rolled from 200 mm casting slab to 20 mm plate with 12 passes has been pre-calculated simulated by established three pre-calculated temperature models for medium-heavy plate to analysis the effect of rolling temperature model on prediction accuracy of rolling force for medium and heavy plate rolling. Results show that the rolling temperature model affects pre-calculated accuracy of rolling force by deformation resistance of stock; during medium-heavy plate rolling s the accuracy of rolling force pre-calculated by using rolling temperature model △t=24Z[(t+273)/1000]4/h relatively constant and the relative error is relatively small,i. e. 0.67%-12.41%.关键词：Temperature Model;Q235 Steel;Medium and Heavy Plate;Pre-calculation of Rolling Force2|0|0更新时间：2026-01-21
- 摘要：According to the issues for the steel 10B21 (/% : 0.19-0.22C, ≤0.08Si, 0.8-1.0Mn, ≤0.020P, ≤0.020S, 0.010-0.040Al, 0.001-0.005B) during steelmaking process including silicon content in liquid going beyond the limit of standard, poor castability and exiting cracked comer of cast billet , with analysis on production data and inclusions in steel, and cast billet macro-examination, it is obtained that after LF white slagging, the SiO2in slag is reduced by Al led to [Si] going beyond the limit； the castability of steel 10B21 decreases by Al2O3in liquid depositing in nozzle, and during casting solidification process the boron nitride and oxide precipitate at grain boundary causing cast billet cracked comer. With using the process measures including increasing BOF end [C] to 0.10%-0.14% , controlling tapping liquid temperature 1640-1660℃,decreasing BOF aluminium iron adding amount from 1.82 kg/t to 1.36 kg/t, decreasing LF refining aluminium iron adding amount from 2.8 to 1.6 kg/t, increasing feeding calcium amount from 1.23 kg/t to 2.05 kg/t, adding micro fixed nitrogen element Ti and optimizing casting process, the ratio of [Si] ≤0.08% increases from 65.62% to 89.50% , single tundish continuous-continuous casting heats in crease from 4 heats to 12 heats and the casting bloom cracked comer is effectively controlled , and the yield of qualified cast billet increases from 88.23% to 97.44%.关键词：100 t BOF-LF-GC Flowsheet;Steel 10B21;Silicon Increment;Liquid Steel Castability;Cracked Comer8|0|0更新时间：2026-01-21
- 摘要：In order to reduce AOD refining slag amount and ferrosilicon amount, the thermodynamic analysis on high chromium steel liquid decarburization and slag basicity control in reducing process and the commercial test on slagging process for 304 stainless steel refining by 45 t AOD unit have been carried out. Pilot production results show that with decreasing slag basicity in decarburization period of 304 stainless steel during AOD refining, the oxidization of chromium in liquid shall be decreased, while it is available to decrease the consumption of AOD refining slag materials and reducing matter； during AOD refining process with decreasing the lime adding amount from average 104.2 kg/t to 84.2-93.1 kg/ t during AOD refining process the average basicity of slag decreases from 13. 44 to 10. 64 in decarburization period and the lime, fluorite and ferrosilicon consumption respectively reduce by 14.7 kg/t, 5.4 kg/t and 4.4 kg/t, and the yield of Cr, yield of Ni and sulphur content in steel are respectively 99.0% , 98.3% and 0.0025%.关键词：304 Stainless Steel;45 t AOD;Slagging Process;Consumption2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet for non-quenched and tempered steel F45MnVS is 50 t UHP EAF-LF-VD-260 mm x300 mm and 180 mm x 220 mm billet casting-rolling to Φ20-Φ160 mm products. According to analysis on microstructure of steel, the hot heading crack is caused by block and lamella MnS and attached with Al2O3-MnO-FeO compound oxide. With using the process measures including controlling Al content in steel 0.010%-0.030% , EAF end [C]≥0.20% and end [P]≤0.025% ,[Mn]/[S]＞20, LF refining slag basicity ≥3.0, after VD soft argon blowing for ≥ 12 min, ensuring homogeneous distribution of sulfur in steel, superheating extent of liquid in tundish 20-30 °C, controlling casting speed to prevent MnS segregation, and controlling finishing rolling temperature 850-1000 °C and cooling rate after rolling 2-4℃/s, the main inclusions in steel is long lath MnS, the hot heading test is all qualified without crack and other defects.关键词：Non-Quenched and Tempered Steel F45MnVS;Hot Heading;Crack;Improvement of Process4|0|0更新时间：2026-01-21
- 摘要：By testing in a 15 kg vacuum induction furnace it is obtained that there is obvious dephosphorization effect by respectively adding Li2O, CaF2Na2O and K2O in CaO base dephosphorization slag series, of them the CaO base slag containing 5% 10% Li2O has optimum dephosphorization results. The results of commercial pilot production of 120 t top and bottom combined blowing converter with double slag operation show that as compared with the earlier stage slag without adding lepidolite (/% : 34.58 kg/t lime, 5.41 kg/t dolomite and 3.13 kg/t sinter) in earlier stage of dephosphorization based on adding 31.46 kg/t lime, 3.70 kg/t dolomite and 0.70 kg/t sinter, with adding 13.88 kg/t lepidolite mineral (/% : 56.41SiO2,3.80FeO, 4.50Na2O, 4.17K2O, 3. 18Li2O) the oxidizability of converter end slag is lower, the average dephosphorization rate and phosphorus equilibrium distribution coefficient of converter semi-steel is respectively 1.67 time and 2.81 times that without adding lepidolite, the converter end dephosphorization rate and phosphorus equilibrium distribution coefficient is respectively 1.02 times and 1.47 times that without adding lepidolite, as compared with nonadding lepidolite the converter blowing end [P] decreases from 0.009%-0.011% to 0.005%-0.006% to meet the requirement of ultra-low phosphorus steel.关键词：120 t Top and Bottom Combined Blowing Converter;Dephosphorization Slag Series;Ultra-Low Phosphorus Steel;Alkali Metal Oxides;Lepidolite Mineral;Dephosphorization2|0|0更新时间：2026-01-21
- 摘要：The 6.2 t 200 mm x 1250 mm slab ingot of 2205 dual-phase stainless steel (/% : 0.015-0.016C, 0.15-0.16Si, 1.35-1.39Mn, 0.005-0.006S, 0.023-0.024P, 22.78-22.95Cr, 5.40Ni, 3.15-3.17Mo, 0.193-0.194N) is produced by a 20 t duplex electrode series drawing ingot elector-slag remelting unit. With the process measures including using 50CaF2-19Al2O3-19CaO-6MgO-6SiO2liquid slag series, controlling ingot drawing speed 12 mm/min and electrode melting rate 1100-1200 kg/h, the surface quality of slag ingot is better, the surface grinding amount is ≤3 mm to meet the requirement for rolling.关键词：2205 Dual-Phase Stainless Steel;200 mm x 1250 mm Electro-Slag Remelting Slab Ingot;Practice of Process2|0|0更新时间：2026-01-21
- 摘要：Generally the converter end [Mn] of low manganese steel is required to control ≤0.05% , according to the issues of high flux consumption and inconstancy of removing manganese from liquid by traditional double slag process, based on thermodynamics and kinetics analysis and. data in production situ, the effect of slag basicity (R 1.68-2.00), temperature (1340-1460℃ ) and FeO content in slag-(FeO) (15.5%-18.7%) on ability of slag to remove manganese in liquid by remaining and double slag process is studied. With the measures including adding partial limestone in splashing and remaining slag period, at blowing beginning adding a small amount dolomite replace partial light burning dolomite and adding a small amount o£ fluorite, and in blowing initial period using higher level lance position to strengthen top slag stirring and speed up early period oxidation of manganese, the end [ Mn] decreases from ≤0.06% to ≤0.045% ； as compared with traditional double slag process, with optimized process the lime consumption of lime decreases by 6.5 kg/t, that of fluoride decreases by 1.48 kg/t and that of iron scale decreases by 6.42 kg/t, the steelmaking flux cost reduces obviously.关键词：90 t Converter;Remaining Slag;Double Slag;End Manganese Content;Flux Consumption2|0|0更新时间：2026-01-21
- 摘要：The metallurgical flow sheet for steel 20CrMnTiH (TS) is 60 t top and bottom combined blowing converter- LF- VD- 150 mm X 150 mm billet casting. The unqualified rate of inclusions in steel 20CrMnTi H(TS) at first examination at steelworks is up to 2% main inclusions are B series ( compound calcium aluminate + magnesia-alumina spinel, and partial alumina) and D series ( calcium aluminate, and partial compound calcium aluminate + magnesia-alumina + titanium nitride) ,that size is more than 20 μm. With the process measures including using low phosphorus hot metal and high quality scrap, converter end [C] ≥0, 09% , adding 40 kg silicon-calcium and 40 kg aluminium cladding steel to replace original only adding 80 kg aluminium cladding steel for pre-deoxidation in converter tapping , using SiC70 to replace SiC45 to diffusion-deoxidize in LF refining, feeding Ti wire after VD, insuring refining end slag basicity 3. 0, and controlling heel liquid more than 2 t, the T[O] decreases from original 12 X 10-6to 8 x 10-6and the unqualified rate of inclusions in steel at first examination decreases to 0.5%关键词：Gear Steel 20CrMnTiH (TS);T [O];B Series and D series Inclusions;Process Optimization4|0|0更新时间：2026-01-21
- 摘要：With using the macro examination method for macro structure of casting bloom and the analysis technology for metal original position statistic distribution the effect of mold electromagnetic stirring current (200-450 A, 3 Hz) on equiaxed crystal zone rate, density fraction and carbon segregation of Φ650 mm heavy round casting bloom of 0.35C steel produced at steelworks has been studied. Test results show that with stirring frequency 3 Hz as current increases from 200 A to 450 A, the equiaxed crystal zone rate increases from 24.2% to 56. 8% while the density fraction of each zone in casting bloom increases gradually and the density fraction at center zone of casting bloom increases obviously i. e. from 0.8649 increasing to 0.9376, and with increasing stirring current the carbon segregation of easting bloom occurs the trend to lighten. Comprehensively considering each factor, as mold electromagnetic stirring current is 450A with frequency 3 Hz the equiaxed crystal zone rate in bloom is largest and the internal quality of bloom is best.关键词：Φ650 mm Heavy Round Bloom;Mold Electromagnetic Stirring;Equiaxed Crystal Zone Rate;Density Fraction;Carbon Segregation3|0|0更新时间：2026-01-21
- 摘要：The tangential and axial impact toughness of steel S355NL for wind power tower flange (/% : 0.14C, 0.22Si, 1.35Mn, 0.010P, 0.002S, 0.06Cr, 0.01Mo, 0.l0Ni, 0.03Cu, 0.40Ceq) at -20~-80℃ has been tested and analyzed. The results show that with decreasing test temperature the V-type impact energy of steel S355NL decreases, the ductile-brittle transition temperature of tangential specimen is lower than -80℃ ( average impact energy at -80℃ is 76.89 J) and the ductile-brittle transition temperature of axial specimen is about —65℃ (average impact energy at -60℃ is 96.10 J and that at -70℃ is 13.28 J ) , the morphology of impact fracture transfers from ductile shear fracture to quasi cleavage fracture and until to complete cleavage fracture with "fan-shaped" cleavage pattern.关键词：Steel S355NL for Wind Power Tower Flange;Low Temperature Impact Toughness;Ductile-Brittle Transition Temperature;Morphology of Impact Fracture2|0|0更新时间：2026-01-21
- 摘要：The dynamic recrystallization of 10 mm strip of Nb-Ti microalloying low-carbon steel (/% : 0.06C, 0.22Si, 1.80Mn, 0.03Nb, 0.15Ti, ≤0.007N, ≤0.002S) in single pass compression with strain rate 0.1-20.0 s-1total deformation 75% at 850 -1100℃ has been tested and studied by using Gleeble 1500 hot simulator. Based on true stress- true strain curves combined work-hardening rate curve it is obtained that the dynamic recrystallization critical strain is 0.4-0.7 and the complete recrystallization strain is 1.1-1.4. The hot deformation activation energy of steel is 618.225 kJ/mol. And based on the Zener-Hollomon equation and dynamic recrystallization status diagram by tested results ,it is obtained the dynamic model of recrystallization of test steel by using Johnson-Mehl-Avrami (JMA) equation method to get the real value of recrystallization volume fraction and by using Epsilon-P model to regress on the test data.关键词：Nb-Ti Microalloying;Low-Carbon High Strength Steel;Dynamic Recrystallization;Work Hardening Rate;Dynamic Model2|0|0更新时间：2026-01-21
- 摘要：With using Gleeble-1500D thermal/mechanical simulation testing machine, the hot plasticity of 230 mm x 1400 mm casting slab of developed high performance steel Q370qE-HPS for bridge beam (/% : 0.09C, 0.36Si, 1.33Mn, 0.013P, 0.004S, 0.036Nb, 0.015Ti, 0.022Als, 0.33CEV) at 700-1050℃ has been tested and studied. Results show that the high hot plasticity zone of high performance steel Q370qE-HPS for bridge beam is at 800-1050℃,as compared with traditional normalized steel Q370qE for bridge beam (/% : 0.14C, 0.38Si, 1.45Mn, 0.012P, 0.004S, 0.028Nb, 0.014Ti, 0.023Als, 0.38CEV) the high plasticity zone of steel Q370qE-HPS is larger j and the low plasticity of steel is at 700-800℃ , in this zone the ferrite lath formed at austenite grain boundaries has low tensile strength especially as the Nb-Ti carbo-nitrides exist grain boundaries, the crack and void form easily by charging stress led to deteriorate the hot plasticity of steel.关键词：Nb-Ti Microdloying;Steel Q370qE-HPS for Bridge Beam;Casting Slab;Normalized Steel Q370qE;Hot Plasticity2|0|0更新时间：2026-01-21
- 摘要：The release rate of nickel in stainless steel 316L (/% ：0.023C, 17.57Cr, 11.23Ni, 2.03Mo) processed with 11 kinds of shaping and surface treatment methods is measured by artificial sweat soaking method and flame atomic absorption spectroscopy. Test results show that the stainless steel 316L cold rolled with 50% reductioti , solid solution treated at 1050 ℃ and mirror polished is only 0.02 μg/cm2/week, finely to meet the European Union new standard EN1811: 2011. But the release rate of nickel is directly affected by shaping process (cold rolled state, cast state) , surface treatment method ( roughness factor) and sampling method (longitudinal, cross section) , which may increase by 3 to 26 times.关键词：Stainless Steel 316L;Release Rate of Nickel;Shaping Process;Surface Treatment Method;Sampling Method2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of oil-quenched at 890 ℃ for 300 s and tempered at 530℃ for 1200 s Φ22 mm rod of spring steel 55SiCrA (/% : 0.55C, 1.45Si, 0.67Mn, 0.010P, 0.005S, 0.68Cr) is hot metal desulphurization- 80 t top and bottom combined blowing converter- LF- RH- 280 mm x 325 mm bloom casting-Φ22 mm rolling products. Examination results show that the center segregation rating of Φ22 mm rolled products of steel 55SiCrA is 3 , the carbon content at center of rod is non-homogeneous i. e. 0.50%-0.60% C, and the carbon content at 1/2 radius of rod is 0.54% ; of steel specimen at center the tensile strength is 1430-1455 MPa and the reduction o£ area is 39%-40% , while of steel specimen at 1/2 radius of rod the tensile strength is 1470-1480 MPa and the reduction of area is 43.0%-45.5% , the serious center segregation ( rating 3) leads to obvious decrease of mechanical properties of oil-quenched and tempered spring steel 55SiCrA.关键词：Spring Steel 55SiCrA;Center Carbon Segregation;Oil-Quenching and Tempering;Mechanical Properties3|0|0更新时间：2026-01-21
- Technical support is provided by Beijing Founder electronics co., LTD 鄂ICP备2022000839号
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
- Total Visits：35684
0