Materials Literature
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The cold upsetting steel is produced by hot metal pretreatment - LD- ladle argon stiring process. It is obtained that the multi- elements compound inclusions in steel lead to cold upseting crack of steel based on analysis of structure and inclusions of cold upsetting crack of 0.23C-0.69Mn steel for rivet by scarning e…
The wearing condition of Φ600 mm×2000 mm CVC roll made of 3.50C- 1.20Si- 1.20Mn-2. 10Cr-4.50Ni- 0.80Mo high chromium high nickel casting iron has been measured in site at CSP hot rolling mill, Lianyuan Steel. The results showed that the roll wearing presented typical box shape,the effect of temperatture on roll wearin…
The evolution law of magnetic induction of traveling wave stirer developed for the concasting slab was determined by using 3- dimensional Gauss meter in laboratory. The test results showed that the magnetic induction of developed two-side stirrer linearly increased with increasing input current at given input frequenc…
The ingredients,characteristics and forming accounts of typical defects - scale-shaped outer-overlap,entraped slag outer-overlap and dregs pit of steel 36Mn2V N80 oil pipe were analyzed. The occured rate of N80 oil pipe typical defects decreased to less than 2% from 5%~6% and tube product yield increased to 86.65% fro…
The hot continuous rolling process of 効00 mm Hll steel round bar for mandrel has been simulated and studied by using MSC. MARC 3- dimensional thermo-mechanical coupled elasto-plastic finite element method (FEM) and contact analysis technique. It is obtained by analysis that with decreasing last pass roller speed Vr th…
The effect of VOD bottom blowing location and blowing rate on mixing time of molten steel was studied by a water model corresponding to 1/9 volume of the 75 t ladle with oval cross section at Taiyuan Steel.The test results showed that the available blowing rate for model was 1.1~1.3 m³/h coresponding to flowing rate 3…
The effect of top lance level and bottom blowing flowrate on mixed time in bath,mouth spraying,penetration depth in steel and liquid surface fluctuation have been studied by 1:8 water modelling of a 85 t top-bottom combined blown converter at Chongqing Steel. The test results showed that maximum stirring energy was ob…
With using magnesitc-calcium brick as lining material of 45 t AOD refining units at Taiyuan Steel to replace magnesite-chrome brick,establishing available AOD line baking procedure,shortening refining time,and controling slag basicity CaO/SiO₂=1.8~2.0,(CaO+MgO)/SiO₂=2.0~2.4,the 45 t AOD lining life has been increased…
The process practice of silicon-calcium wire(φ13 mm)feeding and aluminum wire feeding with feeding speed 2.4~3.0 m/min in a 90 t ladle for stcel 20,34Mn6 and steel BTN/1 produced by LD-LF(WF)-CC flow sheet has been summarized. The practice showed that as calcium feeding amount was up to 200×10-6the residual calcium co…
Ti burning loss rate during electroslag remelting(ESR)of alloy 0Cr15Ni25Ti2MoAlVB in a 2.5 t ESR furnace by 4 kinds of slag systems was tested and analyzed.The test results showed that as remelting using 75%CaF2-15%Al2O3-10%CaO pure terary slag the Ti burning loss rate was 7.0%,lowest in 4 slag systems and free slag g…
Taking tundish for No4 Slab concaster at Nol steel plant, Jinan Steel, computer numerical simulation for difierent weir and dam design scheme was carried out to optimize design of weir and dam in tundish by using turbulent flowage math model. Results showed that for tundish with top dimensions 3500 mm x 800 mm, bottom…
The effect of mold powder with different type and addition of carbon materials on carbon pick-up in 0.003%C ultra low carbon molten steel in 200 mm x 100 mm mold has been studied by theoretical calculation and experimental measurement. The results showed that with casting rate 2.0 m/min, on steady condition of continu…
Based on the hot ductility curves at 600～1400 ℃ tested by Cleeble1500 thermal/strain simulation machine for 0.16~0.20C,0.020~0.060AltQ235B steel 70 mm x 1500 mm thin slab produced by compact strip production (CSP)process,the third brittle zone of cast slab was between 700~900 ℃.Therefore the crack of cast slab easily…
The effect of process of quenching at 960~1140 ℃ and tempering at 200~650 ℃ on martensite stainless steel 3Cr17Mo-0.39C,16.73Cr,1.07Mo,0.25V,0.09Cu for plastics mould has been tested and studied. The results showed that the structure of quenched steel 3Cr17Mo was lath martensite + ferrite +(Fe,Cr)23C6carbide and with…
The effect of using Fe-Al-Mg(2.5%Mg,60%Al)deoxidizer during converter tapping on cleanliness and mechanical properties of thin slab of 0. 17~0.22C SS400 steel produced by 150 t converter - LF bottom argon blowing-LF refning-72.0~92.5 mm slab concasting-2.75～5.50 mm strip continuous rolling process has been tested. The…
The CSP concasting and continuous rolling flow sheet at Lianyuan Steel is second generation CSP technology of SMS-DEMAG,of which the main process is 3×100 t top and bottom combined blown converters- 3×100 t ladle fumaccs (LF)- two strand 45~55 mm thin slab CSP concasting-roller-hearth pit soaking furnace - 7-stand con…
According to requirement of mechanical properties and anti-corrosion for C90 anti-corrosion steel,the Cr3 steel -0.24C,3.05Cr,0.48Mo,0.02Ti has been designed and developed. The mechanical properties of C90 anti-corrosion steel Cr3 produced by 30 t EBT are furnace -LF(VD)-φ110~140 mm HCC process at Hengyang Steel were…
The experiment on calcined denitriding process of recarburizer 95(containing 0. 10%N),petroleum coke(0.93%N)and pitch coke(0.40% N)has been carried out. The results indicated that with increasing cal- cined temperature the nitrogen content in 3 kinds of recarburizer decreased and as the temperature was more than 2000℃…
According to relation of texture - magneto-crystalline anisotropy energy of cold rolled non-oriented silicon steel, the C coefficient of orientation distribution function and M coefficient of magneto-crystalline energy distribution function MDF are obtained by calculation of texture orientation distribution function O…
The phases of clogging of nozzle during concasting of 409L stainless steel(0.009～0.011C,11.36~ 11.63Cr,0. 15~0.22Ti,0.0074～0.0112N)melted by EAF-AOD-VOD refining has been analyzed by scanning electron microscope(SEM)and X- ray diffraction method. The results indicated that phases of clog in nozzle consisted of TiO₂ an…