最新刊期
卷 42 ， 期 6 ， 2021
- 摘要：A compressible and non isothermal three dimensional VOF model for 260 t converter is established. The characteristics of interaction process between the multi hole supersonic jet and the converter bath are studied and the profile change of interface between the jet and the molten steel is clarified. The mechanism of metal droplet splashing is revealed and the size of the cavity is analyzed quantitatively. The results show that the blowing process has instantaneity, the gas liquid interface becomes unstable and causes splashing with the process of blowing and splashing can coexist in the form of large metal strip and droplet. When the lance distance is 22 m and the flow rate is 53000 m3/h, the dead zone area is about 12%~15% of the bottom area, [JP]the cavity diameter accounts for about 55% of the pool diameter, and the cavity depth accounts for about 30% of the pool depth at formed during blowing. Through the analysis of industrial production practice index, it shows that the by process lance distance 2.2 m and flow rate 53000 m3/h, oxygen blowing for 15.2 min, oxygen comsumption 47.7 m3/t, the dephosphorizing rate is 83.1% and the charging materials comsumption decreases to 1115 kg/t.2|0|0更新时间：2026-01-21
- 摘要：The traditional mold flux is mainly composed of CaO and SiO2as the base material,supplemented by an appropriate amount of fluxing agent such as CaF2and the fluorine-free mold flux is to choose B2O3、TiO2and other suitable flux to replace CaF2to achieve the role of green metallurgy.In this paper,the influence laws of heat transfer of the traditional fluorine mold flux CaO-SiO2-CaF2and new fluorine-free mold flux CaO-SiO2-B2O3and CaO-SiO2-TiO2flux films are re- viewed from three aspects of basicity, chemical composition and crystallization properties of the mold flux. Summarizes the metallurgical workers in nearly a decade of fluoride and fluorine-free mold fluxs film heat transfer of research results,it is concluded that the fluorine-free mold flux silicon calcium borate and perovskite crystal mineral phases and traditional mold flux cuspidine have similar crystallization behavior,the content of B2O3and TiO2range from 4% to8% and 3% to 11% can effectively control the heat transfer,thereby reducing the occurrence of slab longitudinal cracks.2|0|0更新时间：2026-01-21
- 摘要：The hot compression of as-cast alloy Ni68Cu28Al is simulated by Gleeble 3500 thermal simulator at defonnation temperature 1 000 ~ 1 150 °C with strain rate of 0.01 ~ 10 s-1. The flow stress curves of alloy at different conditions are analyzed, the constitutive equation describing the high temperature compression deformation of alloy is established, the constitutive equation is applied to the finite element analysis software DEFORM 3D,and the hot compression process of the alloy is numerically simulated to analyze the changes of strain rate field, strain field and temperature field inside the workpiece. The results show that the hardening effect of as-cast Ni68Cu28Al alloy is very strong during deformation, and the softening effect caused by dynamic recovery and dynamic recrystallization is not obvious, the alloy does not recrystallize completely during deformation,the hot compression process of the alloy has obvious non-uniformity of deformation. Comprehensively considering, the best processing temperature of as-cast Ni68Cu28Al alloy is controlled at 1 000 - 1 100 °C , and the strain rate is about 0. 01 s-1.2|0|0更新时间：2026-01-21
- 摘要：By vacuum induction melting 08Cr9CoMo steel using MgO crucible, the pure iron is derusted and baked with other alloys, the charging ingredients are 0. 06% C, 1. 3% Co, 9. 0% Cr, 1. 5% Mo, 0. 02% La-Ce, the balance is iron,turn on the power with vacuum ≤10 Pa, controlling the vacuum 25 ~30 Pa during the melting period, controlling the liquid temperature 1 600 °C and the vacuum 10 Pa during the refining period, and refining for 20 min, adding 0. 02% La-Ce before casting, the final analysis result is 0. 022% C and 0.002 8% 0. The carbon deoxidation capacity under vacuum is calculated by thermodynamics, and it is significantly enhanced as vacuum reduces, the relationship between oxygen supply of the MgO crucible and vacuum is analyzed by thermodynamic calculation, when the vacuum is lower than 25 Pa, the crucible decomposes and supplies oxygen more significantly, when the decomposition rate of the MgO crucible is equal to the carbon deoxidation rate, the molten steel reaches the minimum oxygen content.2|0|0更新时间：2026-01-21
- 摘要：Through 3 heats IF steel of 210 t RH refining process test, the effect of titanium-adjusted time on cleanliness of IF steel in RH refining process is studied by scanning electron microscopy. The results indicate that titanium adjustment after adding aluminum for 2,4 and 6 min, the average N content in molten steel at RH end is 26. 7 x 10-623. 6 x 10-6and 27. 4 x 10-6respectively. When the oxygen blowing amount for heating,the oxygen consumption is 30 〜40 m3and the average initial oxygen content in liquid of RH is 579 x 10-6,the T[O] is 70. 3 x 10-6at the RH end； When the oxygen blowing amount for heating, the oxygen consumption is 75 ~ 90 m3and the average arrival oxygen of RH is 669 x 10-6the T[O] is 109. 2 x 10-6at the RH end. The T[O] at the RH end shows an increase trend with the increase of oxygen activity before adding aluminum. The quantity density of inclusions with 5μm equivalent diameter in steel is 9. 32 /mm2when adjusted Ti alloy after adding aluminum 6 min, it is lowest.2|0|0更新时间：2026-01-21
- 摘要：The effect of coil temperature 572～648 ℃ and cold rolling reduction 65%~75% on properties of the low carbon aluminum killed steel SPHC(/%:0.04C,0.03Si,0. 14Mn,0.027Al)annealed property at 700 ℃ has been studied. The results show that at the same cold rolling reduction,with the increase of coiling temperature,the strength of steel basically presents a downward trend,the elongation relatively increases,and the n and r values basically show a downward trend; at the same coiling temperature,with the increase of cold rolling reduction,the strength basically presents a downward trend,the elongation first increases and then decreases,and the n and r values basically show first increases and then decreases downward trend. By comparison,the best performance of 3 mm SPHC steel plate annealed at 700 ℃ can be obtained by hot rolling coiling at 620 ℃ and cold rolling deformation 70%,that is tensile strength 286 MPa,yield strength 210 MPa, elongation 43%, n-value 0.27, r-value 1.52.2|0|0更新时间：2026-01-21
- 摘要：According to low consumption of scrap consumption in semi-steel smelting converter at Panzhihua Steel caused by insufficient heat source of semi-steel, by calculating the heat balance of the converter,the theoretical scrap consumption under different semi-steel conditions and the corresponding relationship between the end-point carbon,temperature and scrap consumption are obtained.By charging silicon in semi-steel and using carbon during blowing for thermal compensation and adopting technical measures of optimized slag charging system,reducing tapping temperature,the carbon content at the end-point of molten steel has increased from 0.048% to0.068%,BOF tapping temperature reduced from 1658 ℃ to 1638℃,in the case of a lower material consumption of per ton steel,the dephosphorization rate increased by 1.1 percent- age point on average,and the scrap consumption increases from original 38.9 kg/t钢to 68.7 kg/t钢as well.4|0|0更新时间：2026-01-21
- 摘要：he morphology of carbides and the thermoplasticity of high speed steel can be improved by inoculating with rare earth. Test and batch production results show that by 20t MIF+25tLF+25tVD+4tESR process,as Al 0. 12% in steel in VD process adding 0. 1% lanthannm-cerium mixed RE alloy and using 6% REO2slag series in ESR process,the RE content in M42 steel is 0.027%～0.038% stably to obviously improve inclusions morphology and hot plastisity of steel.2|0|0更新时间：2026-01-21
- 摘要：The technological process of C70S6BY steel for automobile engine connecting rod is 130 t BOF-LF-RH- CCM-Heating-Rolling. The content of S and N in steel(0.064%～0.068%Sand 136×10-6～142×10-6N) can be accurately controlled by using1.5~2.0 low basicity CaO-SiO2-Al2O3-MgO slag system in LF refine,nitrogen driving in RH and for 5～10 min circulation after pump withdrawal. The microstructure of the steel is pearlite and a small amount of fer- rite by slow cooling in pit after rolling,the non-metallic inclusions in the steel are mainly MnS and composite inclusions.Of 1050℃ 30 min air coling steel,the tensile strength is 995~1018 MPa,the yield strength is 586~611 MPa,the elongation is 11.5%～13.0%,the reduction of area is 22%~24%,and the HB brinell hardness number is 285~301. All indexes meet the requirements of breaking connecting rod.3|0|0更新时间：2026-01-21
- 摘要：By 120 t converter-LF refining-continuous casting-controlled rolling and cooling process,the 750L (Rm≥ 750 MPa)beam steel of 8 mm high strength automobile is succes fully developed. The results show that through 750L steel Nb-Ti composite microalloying(/%:0.074C,0. 11Si,1.51Mn,0.020P,0.002S,0.042Als,0.033Nb,0. 109Ti), combined with control rolling and cooling(finish rolling reduction≥40%),that of produced 750L steel strip, the tensile strength 782～810 MPa, elongation≥17.5%, grain size11.5～12.5 rating and impact energy ≥90 J, all technical indexes satisfy the requirements of standard.2|0|0更新时间：2026-01-21
- 摘要：The aim chemical composition of JB-J6 steel(/%:0.01C,2. 1Si,0.25Mn,0.018P,0.025S,16Cr) is designed, and by VOD refining technology, LF refining process ( binary basicity slag control in0.9~1. 1), protecting pouring process (superheat degree 30~50 ℃,casting speed 0.9 to1.2 m/min, secondary cooling water rate 0.85 to0.95 L/kg) and rolling temperature1100～1180 ℃,the Tisco soft magnetic ferrite stainless steel JB-J6 wire has been successfully produced, each property meets the requirement of user.8|1|0更新时间：2026-01-21
- 摘要：The high-strength wear-resisting steel HNM450 to meet the complex working conditions of the coal mill has been developed. Its tensile strength is 1727 MPa,elongation after fracture is 14.5%,average HBW hardness number is 522,and impact energy at -20℃ is 38J,it has good strength,plasticity and low temperature toughness.The comparative test results of corrosion and wear simulating the actual working condition of the coal mill show that the corrosion and wear resistance of HNM450 products at 200 ℃ high temperature,pH=5 in the weak acidic humid environment and at 200 ℃ high temperature,pH=9 in the weak alkaline humid environment is obviously better than that of HARDOX450 steel. HNM450 steel has been used in the manufacture of coal mills for downstream users,realized the domestic substitution of imported HARDOX450 steel.3|0|0更新时间：2026-01-21
- 摘要：The process of developed C70S6BY non-quenched and tempered hot-rolled round steel is 80 t top-bottom combined blowing converter-LF+VD refining-240 mm×240 mm bloom continuous casting-Φ60 mm round steel continuous rolling-slow cooling-finishing and non-destructive testing process. The Al2O3-CaO-SiO2slag with basicity4～8 has been used, LF refining time is 45~60 min; after LF, the[S]≤0.010% and [O]≤0.001%; sulphur alloying is carried out after VD,[S] is controlled at 0.063%~0.065%.Before VD tapping,100～150m of magnesium-containing cored wire is fed, and the yield of Mg is 11% to17%, and the ratio of magnesium to sulphur content is approximately 1.56%.The superheat of the tundish liquid is 15~30 ℃,and the casting speed is 0.9 m/min. After normalizing, the tensile strength and yield strength of test steel are 957 MPa and 563 MPa. The material elongation and reduction of area are 12% and 21%.After the magnesium modification treatment, the percentage of sulphide inclusions with length-width ratio 1~2 reaches more than 55%.3|0|0更新时间：2026-01-21
- 摘要：With sampling analysis on defects of Q355 series steel medium plate defect by ultrasonic inspection and heat-transferring simulation for slab solidification process, it is disclosed that the biconical liquid core appearing at slab solidifying front and C/Mn/H gathering in this zone are the cause of the medium plate two side ultrasonic inspection defect. Through process improvement and strict control, the RH vacuum degassing time ≥20 min, the whole process of continuous casting protecting, and hydrogen content of steel in mold ≤2 x 10-6and superheat of continuous casting less than 30 °C ,the center carbon segregation of slab is better than 1.0 rating, combining slow cooling of slab and medium plate, the qualification rate of medium plate inspection is 99. 6% .2|0|0更新时间：2026-01-21
- 摘要：The microstructure evolution and the hardness change rule of GH2036 alloy Φ150 mm bar solution treatment at 1120~1240 ℃ are studied by optical microscope and SEM and HB hardness testing device. Studies have shown that there are two types of rich Cr and Nb-V carbide in the forging microstructure of GH2036 alloy after forging air cooling, most of carbides are backdissolved and the grain size is basically uniform after 1220 ℃solution treatment. The HB hardness number of the alloy is reduced with the increase of heat treatment temperature, but the HB hardness number increases from 185 to 193 at temperature increasing from 1160 to1200 ℃, this is mainly due to the large amount of carbides solving back to matrix.6|0|0更新时间：2026-01-21
- 摘要：The microstructure and hardness of precipitated hardening die steel 0Cr3Ni3MoCuAl with solution-treated at 860~1010 ℃ for 35 min and aging treated at 450~560 ℃ for 3 h are tested and studied.The results show that when the solution treatment temperature is 950 ℃,the holding time is 35 min and air cooling to room temperature,the HRC hardness number is up to 39.5,the structure is granular bainite and low carbon lath martensite and a small amount of residual austenite.When the aging-treated at 500 ℃ for the holding time 3 h and air cooling to room temperature,the HRC hardness number is up to 44.1 and the microstructure is tempered bainite.3|0|0更新时间：2026-01-21
- 摘要：The flowsheet process of U20Mn2SiCrNiMo bainitic rail steel is 150 t BOF-LF-VD-280 mm×380 mm cast bloom-rolling,finishing at 930～980℃,air cooling -340℃ 4 h,air cooling,double tempeing.The microstructure of hotrolled(end rolling at 930～980℃ air cooling)and tempered(320 ℃once-and double-tempering)of U20Mn2SiCrNiMo steel is composed of bainite, martensite and retained austenite.Mechenical properties test results show that the optimum tempering process of U20Mn2SiCrNiMo steel rail is 320℃4 h air cooling+320℃4 hair cooling,double tempeing,its yield strength is 1242 MPa,tensile strength 1393 MPa,HBW hardness 417,elongation 15.0%,reduction of area 60%,impact absorption work Ku2is 98 J,and longitudinal residual stress of rail bottom +180 MPa.2|0|0更新时间：2026-01-21
- 摘要：S43932 stainless steel cold rolled plate with a thickness of 1.0 mm is welded with heat input of 88 、101、 132 and 188 J/mm by tungsten inert gas welding,and the micro-morphologies and phase constitutes of the weld zone are investigated.By the systematic analysis of the tensile properties of welded specimens when perpendicular to and parallel to weld seam,and with notch weld seam and the weld seam Erichsen cupping test results,it is found that when the heat input is 101 J/mm,the welded joint has optimum matching of tensile and forming performance.However, when the heat input larger than 101 J/mm,the tensile strength and Erichsen cupping value of the welded joint decreases drastically. The formation of small grains and the precipitation of Ti-riched(Nb,Ti)(C,N)phase in the weld zone lead to good mechanical properties of the welded joint.2|0|0更新时间：2026-01-21
- 摘要：The microstructure evolution and hardening behavior of CH2696 alloy with aging hardening by different heat treatment scheme are studied. The results show that the supersaturation of CH2696 alloy matrix increases with the increase of solid solution temperature. In 1100 ℃ 2 h solution-treated CH2696 alloy the γ′phase precipitates adequately in 780 ℃ 16 h aging process, and the hardness increases significantly. The low temperature at 650 ℃ 16 h aging treatment plays the role of supplementary aging, it HBW hardness number is 350.3|0|0更新时间：2026-01-21
- 摘要：It is needed of refractory and anti-seismic rebar steel to maintain at 600 ℃ for more than 1 h,the high temperature yield strength can not be lower than the normal temperature yield strength of 2/3. In this paper, mechanical proper- tis of refractory and anti-seismic Cr-Mo-Nb steel at 20 ℃ and 600℃ are studied. The results show that the developed 0.21%C,0.40%Si,1.25%Mn,0.32%Cr,0.40%Mo,0.015% Nb steel, at 20 ℃, the yield strength is 400～520 MPa, strength-yield ratio is greater than1.25, at 600 ℃,the yield strength is 316 MPa, the ratio of high temperature yield strength to room temperature yield strength reaches 0.71,and the high temperature yield strength is 18 MPa higher than the 2/3 value of the standard requirement, which meets the requirements of refractory rebar steel.4|0|0更新时间：2026-01-21
- 摘要：The structure and mechenical properties of Φ52 mm 45MnVTi steel finished rolling at 917～922 ℃ and water-cooling-self-tempering with 680～830 ℃have been tested and researched.Results show that the microstructure of asprepared steel consists of ferrite and pearlite,with the decrease of self-tempering temperature,the yield strength and tensile strength of steel gradually increase,and toughness increases at first and then decreases. When the range of self-tempering temperature is 750 to 770 ℃,the microstructure of steel products is fine ferrite and pealite, and the test steel average value of tensile Strength 841 MPa,yield Strength 547.5 MPa,impact energy 50.5 J with an optimal match between the strength and toughness of steel and pearite lamellar spacing 2.39 μm,to meet the use requirements.4|0|0更新时间：2026-01-21
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