Materials Literature
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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…
A new die steel W4Mo3Cr4VRE(0.78～0.88C,3.50～4.50W,2.50～3.50Mo,3.80～4.40Cr, 1. 10~1.60V,0.15～0.25RE)was smelted by using high speed steel filings of grinding DRI(sponge iron 0.44C- 4.62W-3.27Mo-2.20Cr-0.98V)with definite amount scrap of high speed steel turnings(0.87C-3.50W- 1.30Mo- 1.50Cr- 0.60V)in a 250 kg induction…
The finite element simulation of stress and strain of 230 mm slab with casting rate 1.0 m/min and 3 different roller ways layout-single-point,four-point and continuous straightening have been carried out by elastoplastic finite element method. The results showed that the equivalent Von Mises stress and horizontal stre…
The medium carbon alloy steel Cr-Ni-Mo was melted by a 50 kg vacuum induction furnace, and the mechanical properties of test steel-maximum load and reduction of area at 600～1400 ℃ have been measured by Gleeble-3800 test machine. The test results showed that brittle region(reduction of area ≤60%)of the medium carbon Cr…
Based on established a model for changing of MnO content, it was obtained that with increasing apparent rate constant k, flux-steel interfacial area and reacting time, the MnO content in flux increased. The initial (MnO) and initial [Mn] influenced MnO content in flux. The test results showed that during steel 16Mn 4)…
Dynamic continuous cooling transformation(CCT)curves and structure transition of non quenched-tempered steel 34Mn2VN(0.30~0.34C,1.20～1.70Mn,0.014～0.018N,0.07～0. 12V)at 950℃ with average strain rate 2 s-¹and 15% strain, then cooling with 0.1～45 ℃/s different rate have been studied by Cleeble-1500 thermal simulation mac…
With 50 kg vacuum induction furnace melted ingot,breakdown at 1150 ℃ and two stage control rolling, 12 mm plate finishing rolling at 830 ℃,then relaxation for 27 s,water cooling at 720 ℃ with cooling rate 30~35 ℃/s, the ultra-low-carbon bainite steel-0.023C,1.63Mn,0.52Cu,0.25Mo,0.055(Nb+Ti),0.0011B had compound struct…
The φ5.0~22.0mm wire coils of 0.35C high strength cold heading steel SCM435 with short-time annealing were produced at Ma'anshan Iron and Steel by hot metal pretreating -50 t top and bottom combined blown converter melting-65 t LF refining -6 strand 140 mm×140 mm billet concasting -SMS high speed wire coil mill contro…
Because the sulphur content in steel NVA32(0. 12~0. 18C,1.30～1.60Mn)increases to 0.020% at 210 t BOF melting end point from original 0.005%,it shall be added 1000 kg binary synthetic slag CaO-CaF₂ and added 200 kg aluminium during BOF tapping and added Si-Mn alloy and Si-Al-Ba alloy to decrease sulphur content in stee…
Single pass reduction deformation experiment of a Ti-IF （interstitial atom free） steel - 0. 009C, 0. 017Si, 0. 13Mn, 0. 012P, 0. 013S, 0. 05Ti, 0. 025Als with deformation rate 0. 1, 1 and 20 s-1at 750 °C and 850 °C has been carried out by Thermecmastor-Z thermal simulation machine. The curves of work hardening rate -…
The test results showed that the volatilization rate of block pure molybdenum oxide(MoO₃)in heating period from 600 ℃ to1100 ℃ for 5 min was 30%,which of powder was up to 40%.As CaO reacts with MoO₃ to form CaMoO₄ to decrease the activity of MoO₃,the added CaO could depress the volatilization of molybdenum oxide. With…
The prediction model of end point temperature of molten steel refining in a 40 t ladle furnace has been developed bya modified artificial neural network calculation method. Compared with traditional Back-Propagation (BP) network calculation method, the modified artificial calculation method can increase prediction eff…
The isothermal tempering embrittlement test of 2. 25Cr-lMo alloy steel (% ： 0. 15C, 2. 32Cr, 0. 95Mo, 0. 011S,0. 009P,0. 006 8As,0. 003 5Sb,0. 007 9Sn,0. 01V) for hydrogenation reactor with 146. 7 MPa applied stress at 468 ℃ for 125 h and 400 h has been carried out. Based on the relation curves of temperature and impa…
The test results with electron backscattered difraction(EBSD)and scanning electron microscope(SEM) study and mechanical properties examination show that the structure of microalloying X70,X80 and X100 pipeline steels consists of acicular ferrite,granular bainite and a little lower bainite,and with decreasing effective…
The φ350 mm heavy forging products of 17-4PH precipitation hardening stainless steel were produced by EAF-VOD process melting and pig iron mold bottom casting φ320 mm electrode of 17-4PH steel(≤0.04C,16.20~ 16.50Cr,4.50~4.70Ni,3.30～3.40Cu,0.25～0.40Nb),then remelted to 2.5 t(φ510～550mm)ESR ingot and forged by 800 t hyd…