Materials Literature
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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…
The transverse cracks with length 10～30 mm and maximum wide 2 mm at billet corner vibrating mark trough of pickled 300 mm×320 mm low carbon steel cast bloom produced at Xingcheng special Steel were observed. The production practice indicated that as [Al,] of SA-210 series steel for boiler(0.13～0.25C,0.45～1. 10Mn)incre…
The structure and properties of steel with three kinds heat treatment processes - quenched at 880 ℃ for 30 min oil cooling + tempered at 600 ℃ for 60 min air cooling,normalized at 860 ℃ for 30 min air cooling and two-phase region subcritical treated at 780 ℃ for 30 min air cooling,in order to get a simplified heat tre…
The effect of 1200 ℃ heat treatment and 40%～60% hot deformation at 1050~950℃ on diameters and volume fraction of carbide in 3 mm cast-strip of high speed steel M2(W6Mo5Cr4V2)using Gleeble 1500D auto thermo- simulation machine have been studied by quantitative metallographic examination. The studied results showed that…
The microalloying steel 15Mn2CrVNbE(0. 13~0. 17C,1.44～1.59Mn,0.30～0.60Cr,0.02～0. 10V, 0.02~0.05Nb,0.02~0.05Al)for trigging girder has been produced by hot metal desulphurizing -80 t LD melting-LF (feeding wire)refining - 4 strand billet concasting process at No3 steelmaking plant,Shougang. The production results (149…
The EAF dust at stainless steel works mainly consists of ejected liquid drops of metal and slag formed by breaking of CO bubbles produced by alloy elements evaporation and decarburization reaction and small particles of charging exhausted with waste gas. Comparison with EAF dust at carbon and low alloy steel works,the…
The influence of BaO(2%~8%)on melting and crystalline temperature of concasting mold powder-3~ 5 MgO,1~2 Al₂O₃,8Na₂O,3～4B₂O₃,2Li₂O,3～4 Cand the crystalline phases of free fluoride mold fluxes have been studied and analyzed. The results showed that with increasing BaO content from 2% to 8%,the melting temperature of mo…
The influence of heating temperature(1200 ℃,1180℃)of 180 mm cast slab,rolling passes for 2.3 mm hot coil(7 pass and 5 pass),finishing rolling temperature(780~860℃)and coil temperature(≤710℃)on iron loss and magnetic intensity of 0.5 mm cold rolled non-oriented silicon steel 50W600 has been tested. The results showed t…