Materials Literature
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With optimizing charging structure- using hot metal charging technology; intensifying oxygen supply by coherent oxygen lance technique; material flow sheet revamping by intensifying secondary refining and increasing concasting production capability,the annual steel output of a 60 t AC furnace and a 60 t DC furnace inc…
The test results of process for Φ12 mm SCM435 alloy steel(0 .35C,0 .98Cr,0 . 16Mo)coil rolled by 150 mm×150 mm concasting billet showed that the uniform structure of ferrite + pearlite and excellent cold heading perform- ance of steel were got by heating billet at 1020℃,rolling at 900 ℃,controlling spinning temperatur…
The free cutting austenite stainless steel(0.09~0. 10C,0.80~0.82Si,0.40~0.43Mn,0.08~0.09P, 0. 10~0. 11S,9. 14~9.20Ni,18.12～18.30Cr,0.73~0.78Ti)was melted by a 30 kg vacuum induction furnace and broken down to75 mm×75 mm billet with8 pass by a φ450 mm mill.As steel ingot was heated to 1200 ℃ and rolled at 1150~1060℃ in…
The physico-chemical properties of the mold powder series containing 1.9% fluorine(27～30CaO，30~33SiO22~3Al2O32~3MgO，10~12R2O，1~2Fe2O34～5 C powder，2Li2O，4CaF20~8B2O3) have studied. Results showed that with increasing B2O3content in powder,the melting point,crystallizing temperature and viscosity of mold powder decrease…
The oxygen,nitrogen and inclusion content in liquid steel at converter blowing end point,after added de- oxidizer and alloying at tapping of converter, ladle argon stirred,tundish,and in billet of steel Q235A(0. 14%～0.22% C,0.30%~0.65%Mn)melting by 80 t top and bottom combined blown converter-ladle argon stirring - co…
The velocity distribution of centre axis jet flow with sub-hole pressure0.12～0.20 MPa,the effect of sub- hole pressure and ambient temperature(300~2000 K) on velocity distribution of jet cross section,and the effect of ambi- ent temperature on rule of velocity attenuation at centre axis jet have been analyzed by comme…
Inclusion and mechanical properties of ultra-high strength steel G50(0.28～0.29C,1.88~1.98Si,4.45 ~4.49Ni,1.04～1.05Gr,0.57～0.61Mo,0.031~0.034Nb)melied by two process VIM-VAR and EAF-VOD-VAR have been studied. Results showed that the inclusion rating units of steel G50 melted by EAF-VOD-VAR process were low- er han that…
The stress-strain curves of nickel base corrosion resistant alloy GH536B(G3:0.002C,20.30Cr, 17.50Fe,8.70Mo,1.32W,1.90Cu,0.20Nb)with strain rate1~25s-1at 1030～1300 ℃,the effect of temperature on reduction of area of alloy,the change of alloy structure with hot deformation and effect of strain rate on dynamic recrys- ta…
The effect of current(150～500 A)of mold electromagnetic stiring(M-EMS)technology on metallurgy quality of 280 mm×380 mm,280 mm×325 nm concasting bloom of heavy rail steel U75V etc grade has been tested and studied. Results showed that with the current increasing from 250 A to 500 A,the percentage of equiaxed zone incr…
In order to enhance the service life of hollow steel for rock drill stem,the odd number side section shape hollow steel has been designed. Compared the tensile,compressive and bending resistance of ortho-six,seven,eight and nine side polygon hollow steels,it indicated that the odd number side hollow steels have better…
Velocity and temperature distribution of molten steel in mold for slab with nozzle submerged depth 150-450 mm have been simulated by using software CFX4.3 and a new method to give the velocity at inlet of mold. Results showed that with increasing nozzle submerged depth, the basic pattern of flow and temperature Held o…
The effect of slag basicity(CaO/SiO2- 1.0~3. 1),TFe(5.0%～20.0%),MgO(1.7%～12.0%), Cr2O3(8.0%~30.0%)in slag on magnesia-calcia lining of an 120 t VOD unit has been studied by using scanning elec- tron microscope analyzing the energy dispersive spectrum of reaction layer of magnesia-calcia brick.Results showed that the s…
A mathematical model of solidification process of electro-slag remelting (ESR) ingot under the condition with electromagnetic stirring ( EMS) has been established, and the ESR solidification process of steel 15Mn with spinning EMS has been simulated and analyzed by using Visual Basic language. Results show that under…
The effect of cooling rate,reduction,original austenite grain size and strain rate of0.05C-0. 13Nb steel af- ter single pass-reduction 40% with 2 s-1at 1000 ℃ or two pass-reduction 40% with 2 s-1at 1000℃+ reduction 40% with 5 s-1at 980 ℃ on structure and microhardness HV has been studied by Thermecmastor-Z thermal sim…
The high temperature tensile and compressing plasticity of austenite stainless steel 15Mn-22Cr-0.56N and effect of hot rolling process on structure and mechanical properties of steel have been studied by thermal simulated test and single pass 20%~60% deformation hot rolling test. Simulated steel results showed that th…
The solidification process and structure of high alloy steel Vanadis4(V4)- 1.5C, 8.0Cr, 1.5Mo, 4.0V have been investigated by laser scanning confocal microscope,X-ray difraction,SEM,electron probe micro analyzer,en- ergy dispersive X-ray spectrometer and differential scanning calorimetry. Results showed that the matri…
The infuence of ingredient of refining slag(47～64CaO,13～23SiO215～25Al2O35～10MgO,0~ 8CaF2CaO/SiO2=2.0~4.5) on oxygen content and inclusions in 0.95C-1.50Cr CCr15 bearing steel has been tested and studied by MoSi2electrical resistance furnace with MgO crucible. It was found in test that with increased refining slag basi…
The adding nitrogen processes by added nitrided ferrochrome (56. 2%Cr, 7. 33% N) with (0. 1 ~0. 6) x 105Pa argon or nitrogen atmosphere in 200 kg vacuum induction furnace for melting nitrogenous stainless steel Crl3 (0. 04% ~0.06%N), Cr23Nil9 (0. 22% 〜0.28%N) and Cr22Ni9 (0. 15% ~0. 19%N) have been tested and studied.…
The thermodynamic conditions of formation of MgO.Al2O3in alloy steel (0. 42C, 1. 15Cr, 0. 20Mo) with liquid steel being in equilibrium with slag (CaO-SiO2-Al2O3-MgO) has been tested and studied, and the diagram of MgO- MgO.Al2O3-Al2O3three phases equilibrium and transformation relation has been obtained. Results showe…
The three-dimension morphology of sulfide in 320 mm×300 mm concasting billet of steel 38MnVS5 has been observed and analyzed by using scan electric microscope. The results indicated that the morphology of sulide changed from spheroidic in billet surface to elongated in centre of billet,and the morphology of sulfide in…