Materials Literature
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The effect of 0.52～1.00 Ni on corrosion fatigue properties of 2.000 MPa grade medium carbon spring steel NHS ( 0.44~0.45C,1.95~2.08Si,0.68~0.70Mn,0.90~0.92Cr,0. 14~0. 15V) has been studied by using accelerated corrosion(5% NaCl salt spray)test and rotating bending fatigue test. Results indicated that with increasing t…
The bar products of high C chromium bearing steel CCr15 are produced by 70 t Consteel EBT EAF-LF (VD)-CC process at Egang Co,Wuhan lron and Steel.The results showed that with controlling EAF end carbon ≥ 0.25%,using high basicity slag refining,so that[S]≤0.004%,T[O]0.0008%～0.0012%,the rating of A and B series inclusio…
The cast bloom size for U75V heavy rail steel is 280 mm×380 mm,and the heavy rail products are produced with 14 passes rough rolling(BD1)- medium rolling(BD2)and CCS 6 passes finishing rolling(UR1ER,UR2UR3EF,UF).The interlamellar spacing of pearlite in heavy rail steel at different pass was measured by scanning electr…
Typical hollow forgings-electro-slag remelting (ESR)alloy steel roll sleeve with inner diameter 560～880 mm, outer diameter 670~1200 mm and length 1300～1780 mm is usually produced by ≥2 t ingots. Based on the ensuring product quality, as compared with traditional forging process, it is available to decrease by 2 proced…
The steel T27(0. 10~0. 16C,0. 15~0.25Cr,0.025～0.045Al)for railway belongs in peritectic steels which was produced by 45%～60% hot metal + scrap-50tEAF-LF(VD)-caster flow sheet at special steel plant,Lai Steel. With EAF charging hot metal≥45%,adjusting oxygen supply,ensuring end carbon 0.08%～0. 10%,partly re- placing si…
The effect of inserting depth (0 - 20% depth of bath to surface) and diameter (0. 4 ~0. 7 of ladle bottom diameter) of snorkel on mixing time of bath has been studied by water model of 1/6 of 110 t CAS ladle. Results showed that with increasing depth and diameter of snorkel the circulated flow in snorkel increased and…
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…