Materials Literature
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Effects of B2O3 on melting temperature of two CaO-based refining slag series with low basicity [ ( CaO)/ (SiO2)=3 ~4] and high basicity [ (CaO)/(SiO2)= 5 〜7. 5 ] have been studied. Results indicate that B2O3is more available than Al2O3and CaF2to decrease the melting temperature of CaO-based refining slag, for low basi…
Charge of 70 t high impedance UHP EBT electric arc furnace at Chengdu Iron and Steel,Pansteel is 20% hot metal+80% pig iron-scrap. Three RCB coherent oxygen lances are installed at wall of furnace and two lances for coal powder injection are installed at wall of both side of furnace door. Steelmaking practice showed t…
Based on CaO-SiO2-Al2O3-MgO-Na2O-CaF2slag system with 0.85 basicity, the effect of rotating velocity of TiO2bar (50-120 r/min) , basicity (0.7 ~ 1.15) , flux temperature (1300 ~ 1480 °C ) , TiO2(0 〜12% ) and CaF2(5% 〜15% ) content on TiO2absorbed rate by mold flux has been studied by rotating kinetics method. Results…
Simulated calculation and analysis on equilibrium precipitated phases γ,M6C,P,μ and non-equilibrium solidification of alloy C-276(%;≤0.01C,14.5～16.5Cr,15.0~17.0Mo,≤2.5Co,4.0~7.0Fe,balance Ni)have been carried by using Thermo-Calc thermodynamic calculation software. Results show that during solidification of alloy the…
Behaviour of thermal deformation of steel Cr5 (% ：0.85C, 5.0Cr, 0.6Si, 0.5Ni, 0.4Mo, 0.1V) with stain rate 0.001 〜1 s-1 at 900 ~ 1200 °C has been studied by using Gleeble-3500 thermal simulator. The apparent activation energy Q for steel Cr5 is 307 kJ/mol. The thermal deformation equation for steel Cr5 is given to cha…
Pipeline steel X70 [%:0.04C,1.53Mn,0.106(Nb+V+Ti)] is melted by 100t BOF-LF-RH-CC flow sheet and feeding Φ13 mm 60Si-28Ca wire treatment is used during LF refining.It is obtained by calculation and commercial production test that with increasing wire feeding speed to 200 m/min from 100 m/min,the average calcium yield…
The effect of product thickness (0.35 ~0.65 mm) of sheet on texture, magnetic induction and core less of 0. 003% C-2.40% Si-0.32% Al non-oriented silicon steel sheet have been studied. Results showed that with decreasing the thickness of sheet, the component of unfavorable texture in products to magnetic properties in…
A new 120 t top and bottom combined blown converter with TBM bottom blowing dephosphorization technology and new 6 bore great flow rate oxygen lance is built at steelmaking plant.As compared with original 80 t converter, the speed of reaction between liquid steel and slag increases,the reaction is easily tending towar…
Based on the study on behavior of nitriding and denitriding of stainless steel 304 in AOD refining process, the calculating models for nitriding and denitriding of steel in AOD process have been established. The verified results for the AOD nitriding model by 120 t AOD unit refining show that after picking out the err…
The quality of 150 mm ×150 mm casting billet of 0.60C steel(0.57%～0.62%C) with and without M-EMS (mold electromagnetic stirring) has been systematically studied,and the M-EMS process was optimized. Results showed that with stronger M-EMS current intensity (250 A) and lower superheating extant of liquid steel(≤25 ℃)for…
Test and study on demanganization of hot metal by using 1 kg molybdenum-wound furnace and 10 kg induction furnace show that high [Si] ( ≥0.22% ) , low slag basicity (R≤0.65) and lower temperature are available to demanganization of hot metal ； as hot metal temperature T = 1280 °C , slag basicity R=0.44, (FeO)=11.36% a…
Generally speaking,the carbon content in X120 pipeline steel is 0.05% ,and (Cu+Ni+Cr+Mo)content in steel≤2% with adding microalloying elements V,Nb,Ti,B. The steel has high strength,high toughness and nice weldability by control rolling and heavy accelerated cooling process.The in-line heat treatment process device JF…
Effect of Ca-Si modified treatment on morphology and ingredient of sulfide in steel 30MnVS (%:0.30~0.33C,1.40~1.60Mn,0.08~0.14V,0.065~0.090S) has been studied by optical microscope,scanning electron microscope and thermodynamic calculation. Results show that with increasing Ca content(0.0012%,0.0021%,0.0035% and 0.004…
Coarse grains occurred in the non-quenched-tempered steel 48MnV (% : 0. 45 ~0. 51C, 0. 90 ~ 1. 20Mn, 0. 05 〜0. 10 V ) produced by 100 t EAF-LF ( VD) -300 mm x 320 mm casting-continuous rolling process. As added 0. 030% 〜0. 050% Ti in steel, the rating of grain in 125 mm x 125 mm square bar rolled with 13 passes was 3…
A set of domestic dynamic soft reduction equipment was installed at No5 280 mm x 380 mm bloom concast- ing line at Baotou Steel, bv which the pilot production for heavy steels U71 Mn and U75 V has been carried out for more than one vear. Results showed that with suitable process conditions, the central carbon segregat…
Continuous cooling transformation(CCT) and structure of 85 mm FTSR(Flexible Thin Slab rolling) cast slab ofa low carbon steel(%:0.19C,1.15Mn,0.008Mo,0.002Ti,0.032Als)deformed 40% with stain rate 5 s-1 at 1000 ℃ then cooling with 5℃/s to 900 ℃ and deformed 30% with 50s-1 and cooling to 400℃ with 1~70 ℃/s,then air cooli…
Heavy Rail , Universal Tandem Rolling , Surface Temperature , Prediction Model
True stress-strain curves of 690 mm tube blank of microalloying non-quenched-tempered steel 40Mn2V (% ：0.38C, 1.48Mn, 0.12V) with defonnation rate 0.5~2.0 s-1at 800~1000 °C have been measured by Gleeble-1500 thermal simulator to study the dynamic recrystallization behavior of the steel. Results show that the dynamic r…
Deformation of slab at segment during dynamic soft reduction of casting 200 mm x 1 600 mm stainless steel slab has been simulated by soft ware ANSYS. It is obtained that the effective compensation of roll gap at No.l to No.11 of segment is 0.2 ~ 1.0 mm. Production application results show that with casting speed 0.7 m…
Transformation point of continuous cooling austenite at cooling rate 0.5～50 ℃/s in cast billet of X80 pipeline steel (%:0.034~0.036C，1.79~1.80Mn，0.26~0.62Cr，0.12Nb，0.01Ti，0.0037~0.0038N) melted by 50 kg vacuum induction furnace was determined by Formaster-F Ⅱ dilatometer,and structure of steel was observed. Results sh…