最新刊期
卷 41 ， 期 3 ， 2020
- 摘要：Based on the Taigang 409 L steel casting production process and the parameter of the slab continuous cast¬er machine, influence of submerged nozzle structure on the molten steel flow behavior in the mould and the surface slag entrapment defect of [200 mm x (1060 〜1240 mm) ] casting slab are studied by means of water model experiment and industrial experiment. The results show that the nozzle structure currently in use ( side hole 48 mm x 70 mm, nozzle up dip 15° ) causes severe fluctuation of the liquid lever in mold and heavy entrapment slag on the surface of casting slab. With the condition of no-change nozzle structure, the problem of slag entrapment is impossible to be solved by using nozzle up dip 5° or 10°. The nozzle with side hole size 32 mm x52 mm can effectively solve the slag entrapment on steel409 L surface at small section [200 mm x (900 - 1100 mm) ] or low casting speed (0. 7 ~0. 9 m/min). The nozzle with inner diameter Φ60 mm the average wave height is between 3. 5 mm to 4. 5 mm and entrapment slag decreases from original 36.5% to 0.8% ,the submerged nozzle not only can be applied for present section [200 mm x (900 ~ 1320 mm) ] and casting speed (0.7 ~ 1.1 m/min) but also the casting slab quality can be improved.3|0|0更新时间：2026-01-21
- 摘要：Based on the software Fluent,the flow state and velocity distribution of hot metal in the 100 t iron ladle KR desulphurization with impeller diameter 2.8 m and height 0.75 m,and iron height 3.1 m are numeric-simulated. Through the comparative analysis on the flow field and turbulent kinetic energy with impeller diameter 0.7 ~ 1.1 m,immersion depth 1.00-1.34 m,and stirring speed 60 〜140 i/min,the best process parameters are 120 r/min of stirring speed, 1.34 m of immersion depth and 0.9 m of impeller diameter. Through the process practice, the desulphurization rate of hot metal can reach up to more then 96%.2|0|0更新时间：2026-01-21
- 摘要：According to application of gas supply system of bottom blowing for 120 t converter at Angang Steel, the BOF bottom blowing control model has been established by PID control arithmetic method to realize the rapid, accurate and stable control of gas flow in gas supply pipeline, and meet the requirements of the production process, which could keep the bottom blowing element under stable ; good shape and air permeability and not easy been blocked during the converter service period. With the bottom blowing control model, equipment and technology optimized, the end-point [%C] • [%O] is reduced from 0.00316 to 0.00273, the end-point T. Fe content in slag is reduced by 1.69% , the economic benefit of a ton steel is 12.2 yuan /t to achieve the effect of improving quality and reducing cost.4|0|0更新时间：2026-01-21
- 摘要：The phase diagram of S32760 (022Cr25Ni7Mo3WCuN) super duplex stainless steel during solidification process is determined by Thermo-Calc thermodynamic calculation software, and the solidification mode of S32760 duplex steel is FA (Ferrite-Austenite). By changing the content of austenite and ferrite fanning elements and the different chemical compositions to determine the hot working properties、 Cr2N and ct phase precipitation temperatures, the hot working temperature range of S32760 is enlarged with increasing the content of austenite forming elements C、N、Ni and Mn, and reduced with increasing the content of ferrite forming elements Si、Cr and Mo, however W has no effect on hot working performance. According to the thermodynamic calculation, the optimal chemical composition (/%：0.022C, 0.30Si, 0.80Mn, 25.60Cr, 6.20Ni, 0.54Cu, 3.50Mo, 0.54W, 0.27N) is determined. The optimal thermoplastic temperature of duplex steel S32760 is 1195;℃, the precipitation temperature of Cr2N phase is1050℃andthe precipitation temperature ofσphase is 1020 ℃;, and the hot working range is 145°C , which has been verified by subsequent production practice.关键词：Thermo-Calc热力学计算;S32760超级双相钢;化学成分;40%奥氏体;Cr2N;σ 相4|0|0更新时间：2026-01-21
- 摘要：For the 55SiCr valve spring steel with strict service condition,its deoxidation,desulfurization and inclusion change are studied by laboratory experiments under a low oxygen condition by adding SiCaBa alloy into the molten steel. The results show that SiCaBa alloy has the effect of deep deoxidation and desulfurization, as well as refining the inclusion size. By adding 0.48 kg/t steel of SiCaBa alloy with 49. 8% Si-25. 6% Ca-11. 1% Ba and a proper amount of refining slag with Fe203content less than 1% ,the T[0] and [S] can respectively decrease to 11 x 10-6and 8 x 10-6.5|0|0更新时间：2026-01-21
- 摘要：The 25MnBM track plate steel is produced by 50 ton EAF short process. The control technology of TiN inclusions and the effect of RE on non-metallic inclusions in 25MnBM of steel are studied. The amount and size of TiN inclusions are greatly improved by reducing the nitrogen content of steel below 70 X 10-6and optimizing the continuous casting process. The effect of RE on non-metallic inclusions in 25MnBM track plate steel is studied. Test results show that, after adding 0.20 - 0.25 kg/t RE into steel, the total area of non-metallic inclusions can be reduced, the maximum inclusion size and the average inclusion size decrease, which plays a better role to purify steel.关键词： 25MnBM, Non-metallic Inclusions, RE, TiN2|0|0更新时间：2026-01-21
- 摘要：In order to develop low alloy ultra-high strength steel with super high strength and good toughness, a 15 mm CrNiMo-CrNi3Mo-CrNiMo triple-layer clad ultra-high strength steel is developed by 30MnCrNiMo steel billet and 33MnCrNi3Mo steel ingot, the process consists vacuum combined welding, high temperature rolling, quenching and low temperature tempering heat treatment. The bonding degree and mechanical properties are tested by flaw detection, tensile, impact, cold bending and hardness tests. Microstructure and the impact fracture of triple-layer clad ultra-high strength steel are analyzed by means of optical microscope and scanning electron microscope. Results show that the triple-layer clad ultra- high strength steel produced by current process has good bonding properties and can satisfy the GB/T 7734-2015 I demand of flaw detection. The comprehensive mechanical properties of clad steel plate are fine, and there is obvious transition zone in hardness of the joint surface. Both the structure at bonding site and matrix structure are tempered martensite structure.2|0|0更新时间：2026-01-21
- 摘要：The free cutting 22CrMoHS gear steel (/% ：0.19 〜0.25 C,0.80~1.00 Mn, W0.025 P,0. 040 ~0. 060 S,l. 00 〜1.40 Cr,0. 35 -0.45 Mo) is developed by Suzhou Steel Group. The range of sulfur content in steel is 0.040% ~ 0. 060%. With controlling end point carbon of electric furnace 0.05% ~ 0.12% , beginning refining slag basicity R 4 ~ 5 and (Al203) 25% ~35% ,end of refining slag basicity R 3 ~4 and ( Al203) 25% ~35% at LF, after VD feeding calcium wire to control the calcium content in steel 0.0015% 〜0.0025% ,secondary cooling water 0. 81 1/Kg,and casting speed 0.75 ~0. 80 m/min, the sulfide in the steel is mainly spherical, and the spheroidization ratio of sulfide inclusions is up to 90% to greatly improve the cutting performance of steel.关键词：易切削齿轮钢22CrMoHS;S含量, 硫化物形态4|0|0更新时间：2026-01-21
- 摘要：The recovery rate and distribution of rare earth elements with the condition of feeding rare earth wire in liquid in stainless steel continuous casting mould are studied by industrial test and numerical simulation. The results show that feeding rare earth wire into the mould has 85% rare earth recovery rate, but the content of rare earth near the solidified shell is relatively high and the distribution of rare earth is inhomogeneous (RE 0. 059% 〜0. 073% ) , which is due to the high concentration and inhomogeneous distribution of rare earth in mould liquid at early solidification period. Therefore, the influence of solidification transformation on the distribution of rare earth should be considered in the simulation or industrial production. In order to avoid the segregation of rare earth elements, the matching of rare earth wire diameter, wire feeding speed and continuous casting parameters should be paid attention to.2|0|0更新时间：2026-01-21
- 摘要：The 260 ton top blown converter in Anshan Iron and Steel Group Corporation is taken as the research object to carry out new double-structure oxygen lance melting commercial test. The key metallurgical parameters of six typical continuous heats are analyzed and discussed, and the results are compared with those of traditional oxygen lance nozzle. Results show that the inclination angles of the big and small nozzles for the new double-parameter oxygen lance are designed as 12° and 17° respectively, and the flow rate of the big nozzles accounts for 60% , the average oxygen blowing time of the new oxygen lance is approximately 1 min shorter than that of the current oxygen lance when the composition of molten iron, tapping composition and smelting steel are the same. The iron and steel charge consumption per ton of steel decrease by 20. 3 kg, and the average oxygen supply intensity increases by 0.23 m3/( t • min).2|0|0更新时间：2026-01-21
- 摘要：The longitudinal cracks exist at the surface of heated 150 mm x 150 mm continuous casting billet of steel 55(/% ：0.52 ~0.60C,0.17 ~0.37Si,0.50 ~0.80Mn,≤ 0・035P, ≤0.035S). the subsurface crack defects of eating billet are analyzed by metallographic microscope. The result indicates that the defect is caused by the strong non-nomogneous secondary cooling and excessive harmful element Pb enriched at the grain boundaries. The optimization process of the spray system of the second cooling and reducing the harmful element Pb in steel is carried out. It improves the cooling uniformity and grain boundary strength of casting billet. The result shows the defects of casting billet have been effective controlled. The qualification rate of the first inspection of rolled products increases from 45% to 93%.2|0|0更新时间：2026-01-21
- 摘要：Compare with the three-step method, through the study of smelting and continuous casting of High-Nitrogen stainless steel 10Cr21 Mnl6NiN, the two-step smelting and continuous casting technology has been optimized, the adding nitrogen rate is raised from 5 x 10-6~ 10 x 10-6/min to 20 x 10-6~ 30 x 10-6/min in later stages of LF, the LF refining time is shortened from 390 min to 240 min, the CCM steel waiting time is reduced from 4 h to 2 h ； it solves the problem of slag spilling during the nitrogen adding；it also avoids the billet buckling during continuous casting,the breakage rate of No. 1 & No. 2 casting strand reduces from 100% to O,the equipment accident rate decreases from 66. 7% to 0,to achieve 100% 2- heats sequence casting. The practice shows that the billet casting without closely spaced rolls can produced High-Nitrogen stainless steel even though with only one five-high withdrawing and straightening machine.关键词：高猛高氮不锈钢10Cr21Mnl6NiN;增氮;溢渣;翘头;方坯连铸2|0|0更新时间：2026-01-21
- 摘要：According to the requirements of 200 mm extra thick 12Cr2MolR steel plate for hydrogen chemical industry i. e.P ≤0.007% ,Si≤0. 1% , brittleness index J≤100X≤10x10-6by the electroslag remelting technology of 120 t BOF-LF-VD-continuous bloom and the heat treatment process control of 300 mm thick plate quenching machine, the extra thick 12Cr2Mo1R steel plate with thickness of 200 mm is successfully developed. The steel plate has good comprehensive mechanical properties and internal quality to meet the requirements of design technical conditions.2|0|0更新时间：2026-01-21
- 摘要：The flatness defects of high strength hot rolled wide strip steel AG700L after uncoiling are analyzed in detail. The influences of strip shape and temperature distribution after finishing rolling are discussed, and the influences of the ratio of upper and lower water flow, side spray, cooling methods, edge masking on uncoiling plate and optimization measures are also analyzed. The results show that the main reason of the flatness defects after uncoiling is due to release of the compressive stress caused by the temperature drop of strip edge. The flatness defects could be effectively controlled by optimizing the ratio of upper and lower water flow to 1 ： 1.35 and the angle of side spray, increasing the pressure of side spray to 2.0 MPa, improving the type of cooling and using the edge masking.2|0|0更新时间：2026-01-21
- 摘要：The effect of welding current 70A, 80A, 90A on the microstructure and mechanical properties of steel 40CrNiMoA weld joint is investigated. With the increase of welding current, the appearance quality of the welding seam is better. With the increase of welding current, the temperature of molten pool and the austenite grain size increase, which lead to coarsening of martensite. The microstructure of the weld is martensite and very small amount of residual austenite. The hardness of welding seam is much higher than that of base metal, and the hardness fluctuates greatly. The hardness of the heat affected zone (HAZ) increases gradually from base metal to weld metal. The longitudinal stress at weld center is compressive, while the external compressive stress gradually decreases. The longitudinal stress at the boundary of welding color zone is tensile stress, and the maximum tensile stress is found at this point. The transverse stress of weld center is tensile stress, and it gradually increase outward. The maximum transverse tensile stress is obtained at the boundary of welding color zone, and with increasing the welding current and heat input, the toughness of the material reduces, the ferrite in the structure increases, and the welding residual stress is the cause of brittle fracture. The optimum welding current intensity of 40CrNiMoA homogeneous electrode plate butt welding process is 80 A.2|0|0更新时间：2026-01-21
- 摘要：The effect of different carbon, chromium and molybdenum contents on mechanical properties of six kinds of cold heading steels (/% ：0.19C,0.36C,0.19C-0.96Cr,0.39C-0.98Cr,0.19C-0.91Cr-0.21Mo and 0.37C-0.98Cr- 0.22Mo) at 650 ~ 1200℃had been studied by using GLEEBLE-3500 thermal simulation machine. Results reveal that： the third brittle region of all of the steels is obvious in the temperature range 650 ~ 850 ℃.The starting temperature of the third brittle region moves to higher temperature with the carbon content decreasing or chromium element adding. Addition of chromium deteriorates the ductility and promotes the third brittle region expanding. Addition of molybdenum in the chromium alloyed cold heading steels improves the ductility of the third brittle region.关键词：C;Cr;Mo;冷镦钢;高温力学性能2|0|0更新时间：2026-01-21
- 摘要：In order to avoid or reduce the surface cracks of 320 mm X 280 mm casting bloom of Nb-Ti microalloying of medium-carbon-boron steel(%/:0.35C,0.04Si,0.87Mn,0.010P,0.007S,0.27Cr,0.031Alt,0.03Nb,0.030Ti,0.0018B,0.0046N) ,the high temperature mechanical properties of the bloom are studied,and the microstructure near tensile fracture and impact fracture is observed. The results show that in the range of 600 to 1250℃, the reduction of area of the test steel at 600 °C is 54.4% ,and the that at other test temperature points is higher than 60 %. The I brittle zone of the test steel is higher than 1200℃ and HI brittle zone is 750 ~ 850 °C , and at 850 ~ 1200 °C the tested steel has better hot plasticity. The plasticity of tested steel is relatively low at 800 °C , but the tensile fracture is still dominated by dimpled morphology. The surface quality of continuous casting bloom is good in actual continuous casting production with casting speed ≤1.0 m/min and straightening temperature at 950℃6|0|0更新时间：2026-01-21
- 摘要：The microstructure and mechanical properties of controlled rolling and controlled cooling 0. 31% Ni and 0. 88% Ni two Nb-Ti microalloyed NiCr steel are investigated. The results show that granular bainite, upper bainite, acicular ferrite, polygonal ferrite and a little of pearlite in marine steel are obtained by controlled rolling-cooling. Controlled rolling and control! cooling result in the refinement of the feirite grain and the increase of M-A islands. Both steels have high tensile strength,yield strength,elongation and hardness,and the mechanical properties of 0. 88Ni- 0.32Cr steel are higher than those of 0. 31Ni- 0.33Cr steel. The impact energy of longitudinal direction all of the marine steels exceeds 200 J,and that of 0.88Ni- 0.32Cr steel exceeds 300 J at _80℃. 0. 88% Ni is optimum of containing nickel of steel. This is attributed to the ferrite grain refinement strengthening, M-A islands compound strengthening, precipitation strengthening and dislocation strengthening due to controlled rolling and controlled cooling. Nickel effectively improves low-temperature impact toughness of marine steel.2|0|0更新时间：2026-01-21
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