最新刊期
卷 29 ， 期 1 ， 2008
- 摘要：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 fracture and bending resist- ance than that of the even number hollow steels. The numerical simulation of drawing forming process of ortho-seven- side polygon hollow steel with roling drawing has been carried out,the results showed that the forming shape met the require- ment of technical standard,and the distribution of stress and temperature was uniform,it shall be available for manufacture of odd number side hollow steel stem.关键词：钎钢;奇数边中空钢;拉拔;数值模拟3|0|0更新时间：2026-01-21
- 摘要：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 matrix of steel V4 consis- ted of martensite and retained austenite with main carbides MC and M7C3.The Carbide VC with shape of pole,stick and block was distributed at grain boundary.The crystallization process L→γ first occurred during solidification of the steel to precipitate primary γ phase,with increasing γ phase the alloy elements continuously were enriched in remained liquid,with liquid reaching eutectic,composition,the eutectic reactions,CL→γ+MC and L→γ+M7C3ocncfuorcrld in seoqsuccee.关键词：Vanadis4钢;组织;凝固过程;激光扫描共焦显微镜2|0|0更新时间：2026-01-21
- 摘要：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 condition without EMS the simulated results are agreed with experiment results; and under the condition of applied magnetic field the heat transfer is reinforced in liquid and the metal pool shape goes to plain, which is beneficial to eliminate the defects of ESR ingot such as macro segregation and shrinkage cavity, and available to promote the crystal nucleus developing to equiaxed grain.关键词：电渣重熔; 电磁搅拌;凝固;温度场;数值模拟2|0|0更新时间：2026-01-21
- 摘要：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 commercial software Fluent and using numerical simulation method. Results showed that the amount of entrapped and absorbed ambient medium could obviously decreased as centre jet flow was protected by high temperature and low-density concomitancy flow and the attenuation of ve- locity of centre axis jet flow was slowed down to markedly increase the length of core zone.关键词：Numerical Simulation;Low Density Concomitancy;Turbulence Jet2|0|0更新时间：2026-01-21
- 摘要：The converter combined blowing process was simulated by water model with 800 mm height and 118 mm bath depth. The effect of combined blowing operation parameters on size and space distribution of slag droplet dispersed phase has been studied by using parameter |M8|- proportional relationship between frequency occurrence of dispersed phase and its size, and parameter |K8|-degree of homogeneity of dispersed phase, and the concerned experimental formulas were got. Results showed that with top blowing rate 20 -40 m3/h and bottom blowing rate 0 〜1 m3/h, to increase top, bottom blowing rate was favourable for uniform distribution of slag droplet dispersed phase.关键词：Water Model for Combined Blowing of Converter;Disperse Phase;Size Distribution;Space Distribution3|0|0更新时间：2026-01-21
- 摘要：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 showed that the MgO.Al2O3could formed in steel as [Al] was 0. 000 1% and [Mg] was N2 x IO-6% . With test liquid steel being in equilibrium with slag, the [Mg] was 0. 000 4% ~ 0.000 5% and [Al] was 0. 004 5% ~ 0.006 0% which was in theory- calculated MgO.Al2O3formation zone led to formation o£ main inclusion MgO.Al2O3in steel.关键词：合金结构钢;镁铝尖晶石;热力学;平衡2|0|0更新时间：2026-01-21
- 摘要：The mechanical properties and inclusions of hollow steel 55SiMnMo added 0.018% 120 nm Al2O3nano- powder in earlier stage of reduction penod and 0.002% nano-powder during ingot casting have been studied. Results showed that with added 0.02% Al2O3nano-powder the yield strength of forged and air-cooled steel 55SiMnMo increased by 13.9% and impact toughness at ambient temperature increased by 70.8%;by field emission SEM observation the most of Al2O3nano-particle became non-spontaneous nucleus of non-metallic inclusions and the most inclusions in steel were fined by adding nano-powder,the size of inclusions was 300nm~3 μm.关键词：55SiMnMo中空钢;Al2O3纳米粉;力学性能;非金属夹杂物2|0|0更新时间：2026-01-21
- 摘要：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 the optimum hot plasticity zone was 1000~1150 ℃;and the hot rolling test results showed that the optimum rolling parameters of steel 15Mn-22Cr-0.56N was 40% deformation at 1000~1050 ℃ by which the steel could get higher strength and toughness.关键词：Austenite Stainless Steel 15Mn-22Cr-0.56N;Hot Plasticity;Rolling Process;Mechanical Properties6|0|0更新时间：2026-01-21
- 摘要：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 simulation test ma- chine.Results indicated that with increasing cooling rate the granular bainite gradually increased,of which the content was up to93% as cooling rate was to 5 ℃/s,and the HV value obviously increased,while cooling rate was more than 5 ℃/s the morphology of bainite island structure was changed and the HV value increased little; with decreasing original austenite grain size and increasing reduction the HV value decreased; but the effiect of strain rate on HV value was not appreciable.关键词：0．05-0．13Nb钢;热变形;组织;HV值2|0|0更新时间：2026-01-21
- 摘要：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 deep inserting snorkel (20% depth of bath to surface) the flow field in ladle varied distinctly and the circulated flow in snorkel fbimed obviously. The experimental formula for expressing the effect of bottom gas amount Q and depth of inserting snorkel H on mixing time(T-T0)/T=3.13Q-0.66(H/HL)1.56is obtained by free factors analysis.关键词：CAS精炼;水模型;浸罩深度;流场;混匀时间2|0|0更新时间：2026-01-21
- 摘要：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- tallization temperature of alloy have been studied by Thermomacmaster-Z thermal simulation machine test and microstructure observation. Results showed that the G3 alloy had large resistance of deformation and narrow hot deformation temperature range,and with increasing strain rate,the hot ductility decreased such as for φ10 mm×140 mm sample the tensile strain rate was 100 mm/s,the available temperature for deformation was1130~1260 ℃ but as the tensile strain rate was 200 mm/s the available temperature for deformation was 1130～1220 ℃.关键词：Corrosion Resistance Alloy CH536B;Thermal Simulation;Dynamic Recrystallization;Hot Ductility5|0|0更新时间：2026-01-21
- 摘要：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 increased from before revamping 254500t to 873400 t,tap-to-tap time decreased from 107 min to71 min,electric power consumption decreased from 547 kWh/t to 213 kWh/t,coefficient of utilization of transformer increased from 3142 t(MVA ·a)to 10783 t/(MVA ·a)to get a available steelmaking process at Daye Special Steel and obtain better economic and technology effect.关键词：60t电弧炉;高效化;热装铁水;强化供氧5|0|0更新时间：2026-01-21
- 摘要：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℃ in1~4 pass there was not cracking on billet surface but continuously rolled at 950~770 ℃ in 5~8 pass the serious surface cracking of billet occurred. The SEM analysis results indicated that inclusion in steel was mainly manga- nese sulphide - iron sulphide compounded inclusions.The steel billet cracking has been effectively avoided by controlling breakdown with1~8 pass at 1150~1060 ℃.2|0|0更新时间：2026-01-21
- 摘要：The effect of hot metal charging rate on electric power and oxygen consumption per ton steel,tap to tap time and melting cost of an 100 t shaft arc furnace at Anyang Steel was analyzed and studied. The oxygen supply intensity for this arc fumace can reach up to1.6 m3/(t·min)by using arc fumace wall USTB coherent oxygen supply technology. The practice effect indicated that the coherent oxygen supply technology could meet the requirement of high hot metal char- ging rate melting,and under equal hot metal charging rate condition the smelting electric power consumption could reduced by 25 kWh/t and the smelting cost could decreased by 100 yuan/t.2|0|0更新时间：2026-01-21
- 摘要：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. Results showed that with added nitride alloy in nitrogen atmosphere the yield of nitrogen was more than 80% , while with added nitride alloy in argon atmosphere the yield of nitrogen only 10%. With increasing nitrogen pressure in furnace, controlling suitable adding temperature and adding smaller size nitride ferrochrome, the yield of nitrogen was up to 100%.3|0|0更新时间：2026-01-21
- 摘要：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 temperature at 780～800 ℃ and cooling rate before phase transformation 1℃/s.2|0|0更新时间：2026-01-21
- 摘要：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 slag basicity and TFe content in slag were the important factors for magnesia-calcia lining erosion; with increasing slag ba- sicity(CaO/SiO2≥3)and decreasing TFe content in slag(≤15%),the lining erosion decreased obviously; and as MgO content was4%～12%,Cr2O3was 15%～30%,the effect on lining erosion was minor.2|0|0更新时间：2026-01-21
- 摘要：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 increased from 18.8% to36.2%,the total inclusion amount decreased from8.53 mg/10kg to4.68 mg/10kg and the percentage of ratting units ≤1.0 of defects centre porosity,segregation,shrinkage cavity,centre cracks and midway cracks was up to 98%.As concasting stiring current was 350~400 A for medium carbon steels and concasting stiring current was 250 A for low carbon steels,the percentage of ratting units ≤1.0 of casting bloom intemal defects was respectively up to93% and 90%.关键词：方坯;连铸;电磁搅拌; 冶金质量2|0|0更新时间：2026-01-21
- 摘要：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 serious segregation zone was laminar or laminar + elongated. The spheroidic sulfide formed by peritectic reaction,and the elongated sulfide was e- quilibrium eutectic reaction products. With higher alloy elements content the sulfde grew quick due to supercooling, led to elongated sulfide transforming to laminar sulfide.2|0|0更新时间：2026-01-21
- 摘要：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 - concasting flow sheet have been examined and analyzed. Results showed that end point oxygen content in steel was 350×10-6after added deoxidizer and alloying the oxygen content decreased by 42%,with ladle argon stiring the oxygen content was further de- creased and finally the average oxygen content in billet was ≤25×10-6the nitrogen content in steel increased from 20× 10-6at converter end point to 40×10-6in billet; the inclusion content decreased by about 50% by adding deoxidizer, al- loying and argon stiring,and the inclusion content in billet was ≤45×10-6the size of most inclusions was ≤10 μm, and maximum inclusion was 20 μm.关键词：转炉;Q235A钢;钢包吹氩;气体;夹杂5|0|0更新时间：2026-01-21
- 摘要：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 melied by VIM-VAR proccss,and the oughmess of steel G50(AKu286~88J,KIc130～132 MPa . m1/2)was obviously higher than that(AKu270~74J,KIc112~118 MPa . m1/2)of steei G50 melted by VIM-VAR process.关键词：超高强度钢G50;VIM-VAR;EAF-VOD-VAR;夹杂物;韧性4|0|0更新时间：2026-01-21
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