最新刊期
卷 30 ， 期 2 ， 2009
- 摘要：Based on the physical and mathematical models for electroslag heating on surface of roll core, the thermoelectricity field of slag pool in roll core surface heating system and its influencing factors have been simulated by using large- scale finite element software ANSYS. Study results show that there is a strong current area between the roll core surface and the electrode to rapidly heat the surface of roll core ； with increasing the voltage and the slag pool's depth, and decreasing the distance between electrode and roller, the electric field intensity of slag pool and the temperature of whole slag pool increase and the high temperature zone is centralized between roll and electrode ； with increasing the number of electrode, the distribution of electric field in system is more balancing.关键词：Electroslag Heat;Compound Roll;Thermoelectricity Field;Slag Pool;Numerical Simulation2|0|0更新时间：2026-01-21
- 摘要：Precipitation conditions of magnesium oxide and its compounded inclusions in liquid in X80 pipeline steel was calculated by thermodynamics,that were calculating according to aim acid-soluble aluminium content 0.025% in pipe-line steel at 1873 K,as 0.0008%≤[Mg]≤0.0059%,the compounded inclusion MgO ·Al2O3formed in steel,and as [Mg] ≤ 0.0059%,the MgO should formed in steel.With[Ti]0.015%,as [Mg]=0.0014%,the compounded inclusion 2MgO ·TiO2formed,and as 0.025% ≤ [Al]≤0.047%,the compounded inclusion Al2O3·TiO2formed in steel.The analysis on pipeline steel melted with 50 kg vacuum induction furnace by SEM and EDS showed that in steel treated by magnesium the percentage of inclusion less than 2 μm was 85%,2~5 μm was 14.5% and 5～10 um was only 0.5%. The deoxidation products in pipeline steel treated by magnesium were 2MgO ·TiO2MgO ·Al2O3etc,which could be combined with sulfide and nitride to form compounded inclusions.关键词：Pipeline Steel;Magnesium Treatment;Inclusions2|0|0更新时间：2026-01-21
- 摘要：According to a 70 t ladle prototype at steel works, the water model with model-prototype linear scale ratio 1：2.75 has been established. The obtained critical blowing gas rate was 450 L/min by water modeling test to measure the rate of ladle bottom blowing argon in critical slag entrapment condition. The horizontal flow velocity of liquid surface in ladle with different gas blowing rate was measured in test to analyze the relation between horizontal flow velocity and liquid entrapped slag in ladle and get the liquid surface flow rate in critical slag entrapment condition being 0.652 m/s and its Weber index in that condition being 6.967. Using critical Weber index to calculate liquid surface flow velocity in critical slag entrapment condition and method to define the argon blowing rate for critical liquid entrapped slag by measuring the argon blowing rate up to liquid surface flow rate in critical slag entrapment condition are discussed in this paper.关键词：Bottom Argon Blowing;Critical Entrapped Slag;Water Model;Weber Index2|0|0更新时间：2026-01-21
- 摘要：According to real-time data recording of cold water parameters for mold and temperature of copper plate measured by thermocouple during test of increasing cast speed of hypoperitectic AQ steel grade 230 mm ×1200 mm slab, and combined with math model and ANSYS commercial software,the influence of increasing casting speed on mold average heal flux,local heat flux,temperature field of copper plate and thickness of strand shell has been studied. Results showed that with increasing casting speed from 1.3 m/min to 1.5 m/min,the average heat flux increased by about 0.1 MW/m², the local heat flux in broadside meniscus region increased by more than 0.13 MW/m²which were all in reasonable range due to using test mold powder with high basicity and high crystallizing temperature; the average ratio of heat flux of mold narrow/broad-side was 0.9 so the taper of copper plate should be reduced properly; and the average thickness of broadside strand shell reduced by about 4 mm,therefore the intensity of heat transfer of mold must be controlled strictly to ensure casting process stability and slab quality.关键词：Steel AQ Slab;Casting Speed;Mold;Heat Transfer2|0|0更新时间：2026-01-21
- 摘要：A coupling thermodynamic model to quantitatively describe elements segregation and inclusions precipitation during solidifcation process of clean RE heavy rail steel has been established,and according to the analysis on literature data,the model has higher precision.The effect of RE adding amount on law of precipitation of inclusions and RE elements existence state in clean steel has been analyzed by the model. It is obtained that the MnS and Al2O3inclusions in steel can be modifed by adding RE elements in clean heavy rail steel; the RE oxysulfide(or RE aluminate)first precipitates in steel,then RE sulfide and last RE nitride; and with adding same RE elements amount,the lanthanum solute content is larger than the cerium solute content.关键词：Rare Earth Elements;Clean Heavy Rail Steel;Thermodynamics Model4|0|0更新时间：2026-01-21
- 摘要：Effect of lance inserting depth, gas flow rate and injection location on mixing time for a 300 t hot metal desulphurization-pretreated by double-lance injection process at Baosteel has been studied by 1 ：3.5 water modelling. Results showed that the effect of stirring by off-centre injection was better than that by centre injection ； the deeper the insertion lance, the shorter the mixing time, but the impact to refractory in bottom increased； with increasing gas flow rate the return flow zone increased and the mixing time decreased ； and the mixing time for injection by bending lance decreased by 10% ~30% as compared with that by straight lance.关键词：Hot Metal Ladle;Water Modelling;Double Lance Injection for Desulphurization;Mixing Time2|0|0更新时间：2026-01-21
- 摘要：Based on process parameters of a 300 t RH-MFB unit, the three-dimension mathematical model for liquid steel flow in whole unit has been established. The gas-liquid two-phase flow was treated and described by double-fluid model to analyze the effect of argon flow rate, vacuum, number and location of nozzles on liquid steel flow field and circuiting flow rate. Results show that as argon blowing rate is less than 4 000 L/min, with increasing argon blowing rate , the circuiting flow rate increases； and it is available for the unit with 67 Pa, argon blowing rate 3 500 L/mint immersion pipe immersing 600 mm and 16 nozzles arranging in interleaving way.关键词：RH-MFB Degassing;Liquid Steel Flow Behavior;Circulating Flow Rate;Numerical Simulation2|0|0更新时间：2026-01-21
- 摘要：With considering the boundary conditions for secondary cooling thermal transmission, a mathematical model for thermal transmission to suit slab caster has been established. The measurement results by using infrared thermoscope to measure the surface temperature of 230 mm x 1650 mm slab of X65 pipeline steel conform to simulation results. The cast solidification of pipeline steel with different casting speed has been simulated and calculated by mathematical model to analyze the effect of casting speed on thickness of slab shell in mold, surface temperature of slab and length of liquid core, it is obtained that at given secondary cooling conditions, in order to obtain reasonable surface temperature of slab the casting speed of pipeline steel slab should be 0.9-1.2 m/min.关键词：Slab;Secondary Cooling;Casting Speed;Surface Temperature;Mathematical Simulation2|0|0更新时间：2026-01-21
- 摘要：In order to work out the problem of high air leakage rate of sintering machine at iron and steel works,a simulated magnetic seal device for sintering machine has been manufactured and the magnetic seal test to simulate slit status of sintering machine was carried out by using permanent magnetic alloy NdFeB as seal magnetic source.Results showed that under the action of magnetism,the seal medium was kept within slit to form a dense uniform seal shield so the seal negative pressure arrived 50 kPa at 15～300 ℃.If this magnetic seal technique is used to actual sintering machine the air leakage rate will reduce to “0".关键词：Sintering Machine;Slit;Magnetic Field;Seal;Air Leak Rate4|0|0更新时间：2026-01-21
- 摘要：The output of domestic arc furnace steel increased year by year which was near to 50 million ton in 2007. The number of large electric arc furnace increased obviously,in 2007 the output of ≥ 50 t electric arc furnaces was about 83.5% of total electric arc steel,electric consumption decreased near to 300 kWh/t with tap-to-tap time ≤ 60 min and average electrode consumption 2.43 kg/t,but the processes related to charging,steel grade,energy saving and environmental protection need to be promoted. The domestic electric arc steelmaking process is forging ahead.关键词：Electric Arc Steelmaking;Present Status;Future Development2|0|0更新时间：2026-01-21
- 摘要：Key words:Martensite Stainless steel,Chemical Composition,Process,Surface Treatment,Corrosion Resistance关键词：马氏体不锈钢;成分;工艺;表面处理;耐蚀性5|1|0更新时间：2026-01-21
- 摘要：Main links for removal of inclusions in liquid steel are inclusion growth,floating and separating. The key progress on technique for removal of inclusion in steel is gas stirring-ladle argon blowing,gas shielding weir and dam in tundish, RH-NK-RERM method; electromagnetic cleaning-ladle electromagnetic stiring, tundish centrifugal separating and mold electromagnetic braking; slag washing and filter technique. The metallurgy functions of each technique for removal of inclusions in steel are analyzed in this article. It is available to get optimum metallurgical effect by reasonably combined different technique for removal of inclusions to carry out multi-function refining关键词：Liquid Steel;Refining;Technique for Removal of Inclusions2|0|0更新时间：2026-01-21
- 摘要：As the cleanliness steel was melted by 120 t converter at Masteel,with using ≤ 0.002% S deep-desulphurizing hot metal,cold charge ratio 17%,using[S]≤0.020% low sulphur quality scrap steel,applying off gas analysis dynamic-state controlling technique,controlling converter end slag basicity 3.2～3.5 and adding active lime 600 kg, during tapping,it ensured the end [S] ≤ 0.008%,the percentage of hits for end [C] and temperature increased,the end active oxygen content in steel was 556×10-6the blowing melting lose and splashing decreased, the lime etc slag-making material was ≤ 90 kg/t and the charge of iron and steel was ≤ 1104 kg/t.关键词：Deep-Desulphurizing Hot Metal;Converter Smelting;Metallurgical Effect2|0|0更新时间：2026-01-21
- 摘要：As new steel grades such as X60 pipeline steel etc. were produced by 2250 hot rolling mill at Wuhan Steel, the original laminar flow cooling system could not meet the needs of steel cooling to effect the control of coiling temperature led to un-constant structure and properties of products. With optimization of control model for laminar flow cooling system and adjustment of relative parameters of cooling system, the percentage of hits of coiling control temperature increased to 89.3% from original 60% to insure the aim structure and properties of products.关键词：热连轧;层流冷却;模型;参数优化2|0|0更新时间：2026-01-21
- 摘要：The improved process to decrease T[O] and inclusion content in steel was proposed by analysis on relation between T[O] and stable oxide inclusion content in liquid casing pipe steel 37Mn5 at 1 540 ~ 1 580 ℃ during 100 t LF refining and effect of slag basicity on active oxygen in steel in steel-slag equilibrium state. The thermodynamic calculation and test results showed that [Al] s was 0.03%-0.04% and refining slag basicity was 3 with (CaO)/(Al2O3) =3~3.5, the oxygen content in steel 37Mn5 decreased to 10 x 10-6no heavy-series inclusion occurred in pipe products, and fine-series inclusion rating A + B + C + D ≤ 5 to meet the requirement of service.关键词：石油套管;LF精炼;T[O];夹杂物2|0|0更新时间：2026-01-21
- 摘要：The effect of alloy elements, LF and VD process parameters on LF (VD) adding nitrogen in V-N nonquenched and tempered steel (% ：0.42C, 0.62Si, 1.42Mn, 0.11V, 0.015N) during refining with nitrogen blowing have been tested and analyzed. Results showed that with adding nitrogen fixed elements V, Cr and Mn at early refining phase, quickly raising liquid steel refining temperature to 1620 ~ 1630 ℃ and increasing refining nitrogen blowing time, the average adding nitrogen rate in liquid steel increased to 2.83 x 10-6/min； and with nitrogen stirring during VD treatment and controlling VD treated time, it was available to increase nitrogen yield.关键词：V-N Non-Quenched and Tempered Steel;LF (VD);Adding Nitrogen;Nitrogen Yield2|0|0更新时间：2026-01-21
- 摘要：Cast bloom of GCrl5 bearing steel is produced by 90 t UHP Consteel EAF-LF(VD)-CC flow sheet at Xining Special Steel.With shielded casting practice in whole casting process,the average oxygen content in steel decreased by 3.15×10-6;by controlling the degree of superheat of molten steel ≤ 20 ℃,the casting speed 0.7～0.8 m/min and the secondary cooling water rate 0.40 L/kg,the average equiaxial crystal zone ratio of bloom was ≥ 60% and the quality of bloom obviously increased; and with above optimized process parameters and using 3.25 Hz/250 A EMS for mold and 20 Hz/300 A EMS for solidified front,the carbon segregation index in center of bloom was 0.99～1.20.关键词：CCr15 Bearing Steel;Concasting Process;Optimization4|0|0更新时间：2026-01-21
- 摘要：Φ120～300 mm heavy section bars of carbon and alloy constructional steel are rolled by 370 mm × 490 mm cast bloom at Xingcheng Special Steel.As comparing with grinding wheel peeling process,the metal loss by in-line flame cleaning process is higher by 1.5%~2.0%,but the surface quality of products is higher than that by grinding process,the rejection rate decreases by 0.5%~1.0%.The production rate of cleaning by flame cleaning process is higher and cleaning quality is higher than that by grinding process,the flame cleaning process is available for high quality surface products.6|0|0更新时间：2026-01-21
- 摘要：Cleanliness of pipeline steel(≤0.04%C-1.559%~1.78%Mn)produced by two refining processes-RH-LF and LF-VD with liquid steel melting by hot metal pretreatment- 150 t top and bottom blown converter process has been compared. Results showed that after RH-LF or LF-VD refining,the nitrogen content in pipeline decreased to (30～40) x 10-6the oxygen content was ≤ 10×10-6and the sulphur content was ≤0.0020%;as the basicity of refining slag for LF-VD process was higher than that for RH-LF process,the average phosphorus content in LF-VD refined steel was 0.0090% which was lower by 0.0010% as compared with that in RH-LFrefined steel; the main inclusions in both refining steel were calciun-aluminates inclusion and calcium-aluminate silicon-dioxide compound inclusion; and the size of most inclusions in steel refining by LF-VD was 5~10 μm while that by RH-LF was 5～20 μm.关键词：RH;VD;LF;Pipeline Steel;Cleanliness2|0|0更新时间：2026-01-21
- 摘要：Static (non-deformation) and dynamic (deformation) continuous cooling transformation (CCT) curves of steel0.33C-1.0Mn-0.8Si was measured by Gleeble-3500 thermo-mechanical simulator,and structure of steel was observed. Results showed that the deformation of overcooling austenite could increase initial transformation temperature of ferrite,but had no obvious influence on temperature of completion of transformation,the zone of ferrite transformation of deformed overcooling austenite enlarged,and Ar3value for deformed austenite was higher by 100 ℃ than that for non-deformed austenite while effect of deformation on Ar1was no-obvious; and with increasing cooling rate,the morphology of fer- rite grain changed from polygonal to lath and long leaf structure and the pearlite colonies became more fine and dispersed, and the continuous cooling structure for deformed austenite was finer than that for non-deformed austenite.关键词：0.33C-1.0Mn-0.8Si钢;CCT曲线;相变;组织;细化5|0|0更新时间：2026-01-21
- 摘要：Structure of a non-quenched and tempered steel-(%)0.37~0.38C,0.82~0.92Si,1.78～1.81Mn, 0.06Ti,0.015Nb with three different V-N content-(%)0.130V-0.0215N,0.130V-0.0304N and 0.001V-0.0207N was studied by optical microscope and transmission electron microscope,strain-stress curves of the steel were measured by Gleeble 1500 thermal simulation machine and continuous cooling transformation curves of the steel and each phase content in steel at 900 ℃ and 600 ℃ in equilibrium state were calculated by JMatPro 4.1 software.Results showed that the structure of the steel was pearlite + proeutectoid ferrite; with increasing N content,the amount of pearlite increased with boundary ferrite coarsening; and with decreasing V content,the amount of pearlite increased with bainite and ferite coarsening; the size of precipitates in proeutectoid ferrite and in eutectoid ferrite was ≤3 nm;and the stress during train for steel with higher V and / or N content was larger.关键词：V-N;Meduum Carbon SiMn Non-Quenched and Tempered Steel;Microstructure2|0|0更新时间：2026-01-21
- 摘要：Influence of solution-treated temperature at 920~1100 ℃ on structure and corrosion resistance of medium plate of steel S32750(%:0.022C,25.35Cr,7.17Ni,4.05Mo,0.28N)in 6%FeCl3+0.05NHCl liquor has been studied. The results showed that with solution-treated at ≤ 1000 ℃,the σ-phase precipitated in steel,the ferrite content in structure was ≤11%,the hardness of steel increased and the plasticity,toughness and corrosion resistance of steel rapidly decreased;and with solution-treated at 1050～1100 ℃,the structure of steel was 46%~47% ferrite +austenite,it had excellent comprehensive mechanical properties and corrosion resistance.关键词：Super Duplex Stainless Steel S32750;Solution Temperature;Structure;Corrosion Resistance2|0|0更新时间：2026-01-21
- 摘要：The properties of surface passivating film of cold rolled stainless steel 409L(%:0.017C,11.50Cr, 0. 17Ti) passivated in 20%HNO3solution at 58 ℃ for 0～60 min have been analyzed by using glow discharge emission spectrometry (GDS),scanning electron microscope(SEM)and X-ray photoelectron spectroscopy(XPS),and the effect of passivating film thickness on its corrosion resistance has been got by salt spray test.Results showed that with passivating for 10 min,the passivating film thickness was up to maximum 48 nm;and with passivating for 3 min,the passivating film thickness was 40 nm;the surface nitrides of sample were completely covered by passivating film and the content of chromium oxide was most with best corrosion resistance.关键词：Feritic Stainless Steel 409L;Passivating Film;Corrosion Resistance2|0|0更新时间：2026-01-21
- 摘要：Finishing rolling temperature of 16 mm plate of test steel 15CrMoV(%:0.15C,0.29Si,0.57Mn, 1.01Cr,0.37Mo,0.24V)was 900~950 ℃,then the rolled plate was direct-water-quenched at 880～900 ℃,and tempered at 670~800& ℃.Results showed that the structure of test steel after in-line quenching was martensite + bainite,with increasing tempering temperature,amount of precipitated carbides increased,and bainite lath was gradually merged and finally transferred to carbide + polygonal ferrite structure; with tempered at 730~780 ℃,the steel 15CrMoV had excellent comprehensive mechanical properties with tensile strength 680～760 MPa and impact energy 55～130 J.关键词：Steel 15CrMoV;In-line Quenching;Tempering;Bainite7|0|0更新时间：2026-01-21
- 摘要：Continuous cooling transformation (CCT) curves of non-deformed (static) and deformed (dynamic) austenite of Nb-V-Ti microalloying 08MnCr high strengh steel (S2) at 910~1200 ℃ with cooling rate0.05～30℃/s were measured by using Thermec Master-Z thermal simulator,and corresponding transformation and structure were analyzed and observed. Test results showed that with increasing cooling rate after rolling,the Ar3 transformation point decreased led to further fine the grain of steel; with cooling rate more than 10 ℃/s,the bainite transformation occurred. With increasing heating temperature the transformation temperature decreased,and the transformation temperature for deformed austenite was higher than that for non-deformed austenite. With lower cooling rate the ferrite grain was polygon,and with higher cooling rate the ferrite grain presented pointed shape.关键词：Controlled Rolling and Controlled Cooling;CCT curve;Structure;Phase Transformation2|0|0更新时间：2026-01-21
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