最新刊期
卷 38 ， 期 3 ， 2017
- 摘要：The serious shrinkage cavity defect in 7. 85 t electrode of alloy NS1402 (/%: 0.01C, 0.15Si, 0.34Mn, 0.004P, 0.004S, 22.33Cr, 40.07Ni, 3.22Mo, 2.29Cu, 0.87Ti, 0.11Al, 30.6Fe) melted by 40t EAF+VOD for ESR forms easily in solidification process. By using commercial software CAD, GEOMESH and MeshCAST a model of the electrode filling and solidifying has been established to get the simulated diameter of center shrinkage cavity being 248mm, as compared with measured value the relative error is 4.6%. Results show that as the electrode is located upside down, the diameter of shrinkage cavity decreases by 32.2% ; with increasing the length of insulation board the shrinkage cavity reduces ,and with increasing the length of insulation board by 200mm, the shrinkage cavity below hot top is basically eliminated.关键词：NS1402合金;7.85t电极棒;缩孔;数值模拟;优化2|0|0更新时间：2026-01-21
- 摘要：The value of slag resistance in ESR stable melting condition with different electrode immersing depth is obtained by simulation using MHD ( magneto-hydrodynamics) module of Software Fluent, and the mathematical model of electrode immersing depth is established by relating slag resistance with electric power scheme. In condition of ESR stable smelting of 2.3t ingot at special steelwork, the model calculated value of electrode immersing depth is 14.4mm, as compared with situ measured value 14mm, the relative error is small. With the present electric power scheme- 58V and 9000A for bearing steel G20CrNi2Mo, the minimum slag amount for maintaining normal remelting is 24.3kg/t; the reasonable process for 2.3t ESR ingot is voltage 58V, current 9000A, slag amount 30kg/t and electrode immersing depth 14.4mm.关键词：电渣重熔;数学模型;电极插入深度;电渣阻值;Fluent软件;应用2|0|0更新时间：2026-01-21
- 摘要：The production process of tested non-oriented electrical steel 50W350 (/%: 0.002C, 2.66Si, 0.25Mn, 0.012P, 0.002S, 0.760Als, 0.762Alt) is hot-metal pretreatment, adding 300kg lime in tapping of an 100t BOF, controlling end [C]≤0.05% and tapping liquid temperature 1640〜1650℃ , CAS treating for 5min, RH blowing oxygen to decarburize, adding 99.0% Al-Fe alloy 6.69kg/t and 70% Si-Fe alloy 15.7kg/t in RH refining process, in whole process shielding-atmosphere casting 230mm slab, and using special carbon-free basic shielding agent. Analysis results show that at end CAS treatment the number of inclusions in steel is 306.26 piece/mm2in cast slab that decreases to 145.12 piece/mm2and the ≤3μm inclusions make up more than 90 percent of the total amount of inclusions; in steelmaking process the main inclusions are high-aluminum inclusions, some single Al2O3inclusions exist in liquid at end argon blowing and in ladle ,in tundish and cast slab the Al2O3combines with other inclusions to form complex inclusions in steel；besides the AIN inclusions are found in liquid in ladle and in cast slab； the total amount of large scale inclusions in cast slab is 6.20mg/10kg, the 140〜300μm inclusions make up about 60 percent of total large scale inclusions, and a small amount of large scale inclusions containing Na and K exists in slab.关键词：100tBOF-CAS-RH-230mm板坯连铸;无取向电工钢50W350;夹杂物2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of tested enamel steel TC330 (/%: 0.066C, 0.02Si, 0.66Mn, 0.008P, 0.005S, 0.029Ti, 0.032Al, 0.0020O, 0.0050N) is KR hot metal pretreatment desulfurization-180t BOF-LF-220mmx995mm slab casting- continuous rolling, end rolling at 840~900℃ and coiling at 600~660℃.The simulated temper rolling tensile test on specimen of 2.12mm hot-rolled sheet with 0~5% engineering strain has been carried out to study the influence of temper engineering strain on structure and hydrogen storage property of steel TC330. Results show that simulated temper rolling may increase hydrogen traps in hot-rolled enamel steel to enhance the hydrogen storage property of steel；with increasing engineering strain, the hydrogen storage property increases, as the engineering strain is about 2% , the hydrogen storage property meets the requirement.关键词：2.12mm热轧板;搪瓷钢TC330;平整;组织;氢渗透;贮氢性能2|0|0更新时间：2026-01-21
- 摘要：By using steel plates with radiation-proof material coating welding on conventional ladle exterior shell and lid, a new ladle with vacuum shell is got to reduce heat loss, and the effect of pressure in vacuum chamber (50~105Pa) on temperature reduction of 1873K 500kg liquid steel and the comprehensive thermal transmission mechanism in vacuum chamber are studied by using vacuum thermal insulation theory. Results show that as the absolute pressure in chamber of ladle shell and lid is respectively 50Pa and 105Pa for 30min, the temperature drop of liquid in ladle is respectively 8K and 37K, and the conversion convection additional factor value at 105Pa is 200 times as much as that at 50Pa； the thermal conductivity of insulated layer of conventional ladle is 11 times as much as that of vacuum shell ladle with vacuum chamber absolute pressure 50Pa, and the thermal conductivity of working layer refractory materials of conventional ladle is 116 times as much as that new ladle with 50Pa. Therefore, the new ladle with lower pressures in shell has obvious thermal insulation effect.关键词：钢包;热损失;真空壳;压力;热流;绝热2|0|0更新时间：2026-01-21
- 摘要：By calculation on thermodynamic equilibrium of Fe-Al-Ca-O-S system in calcium treatment process, the digrams of equilibrium curves of [ Al]-[O] , [Al]-[Ca] and [Al]-[S] in each equilibrium condition at 1873K are obtained ,and the effect of each component on modification of inclusions is systematically analyzed. It is found by study that in condition of 0.02%~0. 03% [Al] in F-grade high strength ship plate steel, in order to insure full accomplishing modification of inclusions, the [O] in steel should control less than 25X10-6with forming 12CaO·7Al2O3in liquid the [Ca] is 15.24x10-6~19.97x10-6and with forming 3CaO·Al2O3in liquid the [Ca] is 70.87x10-6~ 92.88x10-6and with lower temperature of liquid it is available to form CaS and inhibit MnS clustered precipitation. The results of commercial production of F-grade high strength ship plate steel DNV F40 (/%: 0.092C, 0.41Si, 1.56Mn, 0.015P, 0.002S, 0.032Al, 0.035Nb, 0.010Ti, 0.080V) by 120t BOF-LF-VD-slab casting flowsheet show that with LF refining slag ingredient/% : 24.9Al2O355.6CaO, 7.7MgO, 8.0SiO2and 1.24TFe, aluminium content in steel 0.03% and oxygen content in steel 0.0010% before adding calcium, and per heat feeding pure calcium wire 150m(0.21kg/m) , the inclusions in steel modified to spheroidal calcium aluminate inclusions from Al2O3before adding calcium.关键词：F-级高强度船板钢DNVF40;BOF-LF-VD-CC流程;钙处理;热力学计算;夹杂物变质2|0|0更新时间：2026-01-21
- 摘要：According to double film theory the kinetics model of blowing nitrogen alloying in steel liquid during stainless steel refining is established. By using silicon-molybdenum bar furnace the effect of nitrogen blowing time (0~70 min), nitrogen partial pressure (N2：Ar = 2 : 1, 1:2 and 1:1) and temperature (1773~1833K) with constant pressure (101kPa) , constant temperature 1833K and constant flow rate 0.3L/min on nitrogen alloying of stainless steel 316L(/%: 0.031C, 0.57Si, 1.00Mn, 0.921P, 0.004S, 16.13Cr, 10.12N, 2.12Mo, 0.028N) has been studied. Results show that with increasing nitrogen blowing time and nitrogen partial pressure the nitrogen content in steel increases；with increasing nitrogen flow rate the blowing time for nitrogen content in liquid up to saturating value decreases；with decreasing liquid temperature the dissolvability of nitrogen in steel increases, and the suitable temperature of liquid is 1500°C. The 120t VOD commercial pilot production of stainless steel 316L show that by blowing nitrogen alloying during VOD vacuum period with nitrogen flow rate 42x3m3/h the nitrogen content in steel may be up to 0.04%.关键词：316L超低碳奥氏体不锈钢;吹氮合金化;动力学;VOD2|0|0更新时间：2026-01-21
- 摘要：The examination and analysis on thickness, structure and composition of surface residual oxide scale of Φ14mm and Φ16mm coii of spring steel (/%：0.58C, 1.66Si, 0.78Mn, 0.006P, 0.004S) have been carried out by using optical microscope and scanning electron microscope. Results show that with eutectoid reaction of Si in spring steel and FeO to form fayalite (2FeO·SiO2) produced pinning effect on oxide scale and higher cooling speed of coil after rolling and thicker decarburization layer of coil lead to difficultly remove the oxide scale by picking process. With decreasing heating furnace soaking temperature to 1050℃;from original 1150℃ , heating time no more than 2h, controlling residual oxygen content in furnace ≤2% , decreasing finishing rolling temperature from original 920℃ to 870℃ and end rolling temperature from 880°C to 840°C to avoid occurring full decarburization layer to lighten and avoid to form fayalite ( 2FeO·SiO2) , descaling water pressure ≥14MPa and decreasing average cooling speed from 1.9°C/s to 1.6°C/s to make partial FeO transformation, expanding and cracking, the picking effect markedly improves. Results show that after process improvement the picking defect ratio of oxide scale decreases from original 2.91%~3.58% to 0.69%~1.65%.关键词：弹簧钢盘条;氧化铁皮酸洗残留;光学显微镜;扫描电镜;铁橄榄石;脱碳层2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of pilot-produced steel 80MnCr (/%: 0.79~0.81C, 0.92~0.97Mn, 0.26~0.32Si, 0.009~0.017P, ≤0.005S, 0.92~0.97Cr, 0.06Mo, 0.03~0.05Ti, 0.027~0.032Al, 0.0004~0.0012O) is BF-70t BOF-LF-VD-Φ450mm Round bloom casting-rolling to Φ90mm bar. With the process measures including controlling BOF end [P]≤0.015% and end [C]≥0.12% , pre-deoxidizing with 1.5kg/t steel cored aluminium at tapping, deoxidation by feeding aluminium wire in LF, refining slag basicity N4, after VD feeding calcium wire, mold-EMS and end-EMS in casting, the rating units of inclusions in steel are heavy series 0 and thin series ≤0.5, the rating of macrostructure are central porosity ≤1.5, general porosity ≤0.5, central segregation ≤0.5 and ingot square-segregation zone 0； and the qualified rate of steel products by ultrasonic nondestructive measuring is up to 93.07%.关键词：80MnCr磨球钢;70t BOF-LF-VD-CC流程;低倍组织;非金属夹杂;超声波探伤5|0|0更新时间：2026-01-21
- 摘要：Effect of chromium content (0.15%~0.27% ) in hot metal on dephosphorization rate, yield of Cr and Mn, and mechanical properties of steel HRB400 has been tested and studied. It is obtained by production practice that the optimum Cr content in hot metal is 0.18%~0.25% and the suitable slag (Cr2O3) is 2% , with reasonable controlling slag ingredient (/%：45.84CaO, 16.10SiO28.81MgO, 1.60Al2O33.48P2O51.55Cr2O313.23TFe, R2.84) the BOF dephosphorization rate of liquid is 80.33% and the yield of Cr is 71.35% , BOF end [Cr] is more than 0.13% , the Si and Mn content in steel may decrease respectively 0.02% and 0.03% , it is available to replace partial Si and Mn by residual Cr to decrease the production cost.关键词：60t转炉;含铬铁水;冶炼工艺;实践5|0|0更新时间：2026-01-21
- 摘要：The iron ladle injecting dephosphorization process is adopted to supply quality low phosphorus hot metal for a 70t AOD to melt 400 series stainless steel and replace the EAF melting link at stainless steel works, finally the new 1-step stainless steel steelmaking process is realized. The production practice shows that the initial hot metal [P] is 0. 20% , after iron ladle injecting dephosphorization treatment the hot metal [P] is 0.001%~0.010% , the hot metal [C] ≥3. 2% and temperature ≥1320°C , it is wholly to meet the requirement for AOD steelmaking 400 series stainless steels, as compared with original 70t EAF-AOD flowsheet, the production cost reduces greatly.关键词：铁水罐喷吹脱磷;AOD一步法;400系不锈钢;成本2|0|0更新时间：2026-01-21
- 摘要：The Φ2.51mm cold-drawn rod of ferrite stainless steel 0Cr13 (/%: 0.03C, 0.43Si, 0.65Mn, ≤0.030P, ≤0.030S, 12.80Cr) is cold-drawn from Φ5.50mm hot-rolled coil annealed at 860°C for 2h by 5 and 7 passes. The effect of cold-drawing deformation, distribution of draught and cold-drawing passes on structure and properties of the steel is tested and studied. Results show that as total draught is more than 61.3% , the obvious fibrous structure occurs in steel；during cold-drawing process with increasing the draught, the of tensile strength of steel increases in three-stages, i.e. fast, slow and fast increasing；in first and second drawing passes, with equal draught the work-hardening of steel is more serious；with total draught 79.2% , the tensile strength of steel rod cold-drawn with 5 passes is high by 20MPa than that with 7 passes ； the suitable draught for beginning two passes is that first pass 35.1% and second pass 10.5% ; comprehensive considering from specific production condition, as compare 7 passes process the 5 passes process is more suitable to produce the Φ2.51mm products of steel 0Cr13.关键词：0Cr13铁素体不锈钢;冷拔工艺;组织;性能2|0|0更新时间：2026-01-21
- 摘要：The conditions of thermodynamics and kinetics for molybdenum trioxide reduced by main elements C, Si, Mn and Fe in BOF liquid are analyzed and the adding method of molybdenum trioxide during BOF steelmaking process is discussed. And the commercial production of steelmaking medium carbon cold-heading steel SCM435 (/%：0.35C, 0.22Si, 0.67Mn, 0.003S, 0.012P, 0.97Cr, 0.20Mo) is carried out in an 80t BOF by molybdenum trioxide to replace ferromolybdenum. Results show that the molybdenum trioxide in BOF has excellent reduction condition；in order to prevent evaporation of molybdenum trioxide, it is adding mix with inhibitor lime to insure the yield of molybdenum. The commercial pilot production show that by using molybdenum trioxide the average yield o£ molybdenum is up to 96.65% , the cost of tonnage steel decreases by 5.1 yuan, it meets the requirement of production.关键词：三氧化钼替代钼铁;还原;80t转炉;热力学分析;应用2|0|0更新时间：2026-01-21
- 摘要：With using the theory of mold lubrication effect and by theory calculation on relation between mold oscillation parameters and liquid friction force and mold powder consumption, it is obtained that with increasing mold oscillation frequency the consumption of mold powder increases and with increasing the mold oscillation offset value the friction force of liquid in mold decreases, The application results of 160mmx160mm cast billet of cold-heading steel SWRCH35K show that with increasing the mold oscillation frequency from 160c/min to 190c/min, the consumption of mold powder increases from 0.35kg/t to 0.39kg/t, with increasing the mold oscillation offset value from 0.20 to 0.25, the friction force of liquid in mold decreases obviously to improve the surface quality of casting billet.关键词：160m X160mm铸坯;冷撤钢;结晶器振动;保护渣消耗量;结晶器润滑效果;表面质量2|0|0更新时间：2026-01-21
- 摘要：The metallurgical flowsheet for tested steel 5Cr5WMoSiV ( HYRH12, /%: 0.53C, 0.30~1. 10Si, 0.35Mn, ≤0.025P, ≤0.010S, 5.30Cr, 1.30Mo, 1.20W, 0.50V) is 3t induction furnace-780kg ESR- annealing-110mm square billet forging-Φ42. 5 mm rolled bar-Φ14mm rolled products. The effect of 0.03%~1.10% Si and 1010~1070°C quenching +510〜550°C tempering treatment on metallurgical quality, structure and mechanical properties of steel 5Cr5WMoSiV has been studied. Results show that the Si is obvious to promote the precipitation of carbides in steel and markedly to increase the hardness of steel; in steels containing 0.3% , 0.7% and 1.1%Si, the toughness and strength of 0.7%Si steel are lowest, but the toughness and bending strength of 0.3%Si steel is highest；the HRC harness value of 1.1%Si steel quenched at 1060~1080°C is up to 64. As service for cold-rolling mill middle roll, the suitable Si content in steel 5Cr5WMoSiV is 1.0%~1.2% , the recommended heat treatment process for steel 5Cr5WMoSiV is quenching at 1030~1070°C and tempering at 520~540°C.关键词：5Cr5WMoSiV钢;Si;碳化物;硬度;冲击韧性;强度4|0|0更新时间：2026-01-21
- 摘要：The steelmaking flowsheet of tested bearing steel GCr15 (/%: 1.00C, 0.20Si, 0.39Mn, 0.015P, 0.005S, 1.50Cr, 0.003Ti, 0.015Als) is pre-desulphurized hot metal-100t BOF-LF-RH-200mmX200mm billet casting. The main process characteristics are adding 1.2kg/t aluminium for pre-deoxidation in BOF tapping, using white slag operation in LF refining with initial slag main ingredient (/%: 22Al2O356CaO, 10SiO25MgO), RH 67Pa for 25min and shield casting in cast process. Analysis results of two heats malting show that the oxygen and nitrogen content in liquid at end RH are lowest respectively 7X10-6~8x10-6and 24x10-6~26x10-6the size of majority inclusions in steel is 3~8μm, and the number of inclusions in steel at unit area is lowest at end RH, and the main nonmetallic inclusions in cast billet are Al2O3-CaO; with condition of high basicity refining slag the calcium aluminate easily reacts with magnesiumaluminum spinel, with slag basicity 2~3 the small amount of MgO-Al2O3occurs and with slag basicity more than 4 the MgO-Al2O3series inclusions don't occur, besides with condition of high basicity the MgO content in MgO-Al2O3-CaO series inclusions is able to decrease.关键词：100t BOF-LF-RH-CC流程;轴承钢GCr15;夹杂物;尺寸;成分;演变2|0|0更新时间：2026-01-21
- 摘要：The tested steel 0Cr17Ni4Cu4Nb (/%: 0.016~0.017C, 0.31~0.35Si, 0.79~0.85Mn, 0.009~0.012P, 0.008~0.010S, 15.29~15.43Cr, 4.10~4.15Ni, 3.34~4.92Cu, 0.25~0.27Nb) is melted by a 25kg vacuum induction furnace and forged to Φ18mm bar. The 3.34%~4.92% Cu content on phase transformation point of steel 0Cr17Ni4Cu4Nb, mechanical properties and structure of steel oil-quenched at 1040°C for 1h and oil-cooling aged at 460~610°C for 2h is tested and studied by mechanical properties measurement and structure analysis. Results show that with increasing Cu content in steel the effect of Cu content on Ac3is not obvious but the Ac1decreases in some extent, and the Mspoint of steel moves up while the Mfpoint of steel comes down；with higher Cu content in steel the strength and hardness of steel is higher, but plasticity of steel is slightly lower；with control the Cu content in steel being minimum to middle of standard permissible variations, it is able to meet the mechanical properties requirement of specification, i. e. with aged at 460~500℃ the steel Rm≥1315MPa, Rp0.2≥1175MPa, A≥10% and Z≥40%.关键词：0Cr17Ni4Cu4Nb马氏体沉淀硬化不锈钢;Cu含量;力学性能;富Cu相2|0|0更新时间：2026-01-21
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