最新刊期
卷 37 ， 期 6 ， 2016
- 摘要：The simulated CSP process tested Cu-bearing high magnetic induction oriented (Hi-B) steel (/% : 0. 06C, 3. 38Si, 0. 14Mn, 0. 013P, 0. 003S, 0. 37Cu, 0. 019Als, 0.0087N) is melted by laboratory 15 kg vacuum induction furnace, cast to 60mm x 120mm slab and hot-rolled by 5 passes to 3. 95 mm plate with finishing rolling temperature 870 °C. The effect of direct water-quenching (after rolling water-quenching at 870℃ ) and stepped cooling ( after rolling water-quenching at 870℃ to 580℃ then air-cooling) process on precipitation of inhibitors at surface layer and center of hot-rolled plate has been studied. Results show that the main inhibitors precipitated in hot-rolled plate are Cu2S spherical particles with some MnS etc ； the amount of inhibitors precipitated at surface layer of hot-rolled plate is less than that precipitated at center of plate, but the average size of inhibitors is larger than that at center； and the size of precipitated inhibitors in steel plate by stepped cooling process is larger than the size of precipitated inhibitors in steel plate by direct water quenching process.关键词：热轧板;含铜高磁感取向硅钢;组织;抑制剂;冷却工艺3|0|0更新时间：2026-01-21
- 摘要：The metallurgical flowsheet for steel 18CrNiMo7-6 (/%: 0. 17C, 0. 57Mn, 0. 24Si, 0. 012P, 0. 003S, 1.70Cr, 1. 49Ni, 0. 28Mo) is 60t EAF-LF-VD-2.1t ingot. The variation of amount, size and ingredient of inclusions in steel after EAF aluminium pre-oxidation, LF aluminium shot and silicon-carbide mix deoxidant diffusion deoxidation (LF initial slag ingredient /%: 57 ~ 60CaO, 20. 5 ~ 22. 0Al2O39. 9 ~ 11. 3SiO28. 8 ~ 10. 6MgO, 0. 7 ~ 1. 1FeO, 0. 7 ~ 0.9MnO) , VD and soft blowing has been analyzed by sampling. Results show that during refining process the amount of inclusions decreases by 16. 67% , the amount of >10μm inclusions decreases by 50% and the ≥30μm inclusions basically are removed from liquid ； during refining process the main formed-inclusions are magnesium-aluminium-calcium compound inclusions and CaS, MgS and MnS etc sulfide; the main inclusions in finished products are Mg-Al oxides and main sulfide is MgS with minor MnS and CaS etc sulfide. The further optimized steelmaking process is to control the formation of small and medium size inclusions.关键词：18CrNiMo74齿轮钢;60t LF-VD精炼;非金属夹杂物演变;分析4|0|0更新时间：2026-01-21
- 摘要：By using JMatPro software and according to the 0. 70C steel coil (/%：0. 67C, 0. 17Si, 0. 50Mn, 0. 010P, 0. 010S, 0. 10Cr) produced at steel works, the effect of C (0. 65% ~ 1. 00% ), Si (0. 20% ~ 0. 55% ), Mn(0. 50% ~ 1. 45% , Cr (0. 10% ~0. 75% ), S (0. 010%~0. 070% ) , P (0. 010%~0. 060% ) and austenite grain ratting (5. 0 ~ 8. 0) in high carbon steel rod coil on martensite formation critical cooling rate (CCRMf) has been simulate to get the predict high carbon steel CCRMfexpression: CCRMf/(℃·s-1) =4. 088 -9. 98 x [C]/% -3.58 x [Si]/% -5.12[Mn]/% - 0. 001 [P]/% +23. 45 x [S]/% -7.42 X [Cr]/% +2 x GmGm-austenite grain size rating. Results show that with increasing the C, Mn, Si and Cr content in steel the CCRMfdecreases, with increasing the S content in steel and original austenite grain size rating the CCRMfincreases and the effect of P on CCRMfis minor； the effect of C and Mn on CCRMfis largest； and the measure value of martensite formation critical cooling rate ( CCRMf) of the 70C steel is 8. 51 ℃/s, and its calculated value is 8. 79℃/s with error 0. 28 ℃/s. It is suggested that during high carbon steel casting process the key point is to control C and Mn segregation and to fine austenite grain size during rolling process for decrease of formation of martensite structure.关键词：高碳钢盘条;马氏体;临界冷却速率;JMatPro软件;数值模拟2|0|0更新时间：2026-01-21
- 摘要：With established calculated spread model for test medium and heavy plate rolling process, the predicted calculation on rolling load for steel Q345 (/% : ≤0.20C, ≤1.60Mn, ≤0.55Si) in each rough rolling pass by 10 passes rolling from 210 mm casting slab to 48 mm plate has been carried out and the effect of test spread model and Besse spread model on medium and heavy plate rolling load is analyzed. Results show that in medium and heavy plate initial 2 and 3 pass and last 9 and 10 pass the predicted precision of rolling load calculated by test spread model is higher, its relative error is 0. 26% ~0. 68% , in 4 ~ 8 passes the predicted precision of rolling load calculated by Besse spread model is higher, its relative error is 0. 33%~11. 79% , and for the two models all the relative error in first pass is 18. 00%.关键词：Q345钢;宽展模型;轧制压力;中厚板2|0|0更新时间：2026-01-21
- 摘要：In order to reduce the rejection rate of tundish tailing slab, prevent the slag entrapment of liquid in tundish in tailing slab decreasing casting speed process,the effect of casting speed change during tailing slab casting process on turbulence slag entrapment of liquid in a 80 t tundish for No3 slab caster at steelworks has been studied,and the optimization of process of decreasing tailing slab casting speed is carried out by using fluid dynamics software FLUENT. The optimization scheme to decrease the tundish tailing slab casting speed is defined by analysis on the turbulent kinetic energy-time tracking curves in remain time course after each casting deceleration. Based on the original scheme the casting heel increases from 8 t to 10 t,the duration of casting at each casting speed shortens and the final casting closing-up operation increases from 0. 1 m/min to 0. 2 m/min to reduce the possibility of tailing slab slag entrapment and decrease the production cost, the time of tundish tailing slab casting duration saves by 266. 8 s and the amount of saving liquid is 5. 08 t. After using the optimized operation at 300 mmx2000 mm No3 slab caster the total amount of rejected tail slab per month decreases from 576.4 t to 139. 1 t.关键词：80t中间包;300mm板坯;尾坯;卷渣;数学模拟;优化效果6|0|0更新时间：2026-01-21
- 摘要：The simulation research on liquid flow field, temperature field and inclusions moving trace in tundish for two strands slab casting with 3 kinds of structure-(a) turbulence inhibitor and wall + dam (original structure) , (b) turbulence inhibitor, wall + dam and channel filter and (c) turbulence inhibitor, wall and channel filter has been carried out by using geometric similarity 0. 29 ： 1 water model and mathematical model. Results show that in tundish with original structure (a) the plug flow area is relatively small and the dead area is rather large； by adding channel liquid filter (b) the short circuit flow basically disappears, the dead volume in tundish decreases by 6. 83% and the average resident time of liquid increases from 287. 04 s to 373. 76 s, it is available to remove the inclusions from liquid and the effect of filter on drop in temperature of liquid is not obvious ； by using the filter to replace the dam (c) the effect of optimization is particularly obvious, that is the average residence time of liquid in tundish increases from 287. 04 s to 404.26 s, the peak time increases from original 95. 4 s to 190.8 s and the dead volume decreases from 36.10% to 8.76% .关键词：63t中间包;板坯连铸;水模型;停留时间分布(RTD)曲线;通道式钢液过滤器;数值模拟2|0|0更新时间：2026-01-21
- 摘要：Based on analysis on MnS in 016 mm rolled products and in 150 mm x 150 mm casting billet of sulfur-bearing gear steel QT20CrMo (/%：0. 20C,0. 020S,0.020Al,0. 95Cr,0. 20Mo) to get the factors to occur non-qualified rating of A-type inclusions (Anne >3 rating and Aeuaret. >2. 5 rating) in steel, it is obtained that the large size MnS inclusions occurring in central zone of casting billet are source of non-qualified rating A-type inclusions in rolled products and the serious center segregation is main reason of formed large size MnS inclusions in central zone of casting billet. With increasing secondary cooling water rate from 0. 37 L/kg to 0. 59 L/kg, the billet central carbon segregation index decreases from 1. 12 ~ 1. 44 to 0. 93 ~ 1. 23, the sulfur segregation index decreases from 1. 28 ~ 1. 70 to 1. 01 ~ 1. 31 and the size of max network MnS decreases from 2 000μm to 1 000μm. As a result the qualified rate of rating of A-type inclusions in steel QT20CrMo rolled products is up to 100% , and the ratio of ≤2. 0 rating of A-type thin inclusions increases from 25. 0% to 97. 0%.关键词：含硫齿轮钢QT20CrMo;150 mm X 150 mm铸坯;A类夹杂物;中心偏析;二冷比水量2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet for angle steel Q420B for tower (/% : 0. 12~0. 17C, 0. 15 ~ 0.35Si, 1.25 〜1.60Mn, ≤0.035P, ≤0. 035S, 0. 06~0. 09V) is 60 t BOF-LF-220 mm x 290 mm bloom casting-section steel rolling. The surface cracks and inclusions occur at partial batches of finished tower anger steel products after pickling and the analysis results show that the depth of cracks is up to 1 mm with inclusions, oxidation and decarburization phenomenon. With the process measures including decreasing the basicity of mould shielding powder from 0. 97 to 0. 79 and increasing its viscosity from 0. 236 Pa·s to 0.450 Pa·s, increasing the straightening temperature casting slag from 900 to 1 000 and decreasing the secondary cooling water rate from 0. 9 L/kg to 0. 7 L/kg, the qualified rate of casting bloom increases from 93% to 97% and it is available to avoid the formation of crack of angle steel.关键词：Q420B铁塔角钢;表面裂纹;成因分析;保护渣粘度;二冷比水量4|0|0更新时间：2026-01-21
- 摘要：The metallurgical process flowsheet for DY105 steel wire (/%： 0.90C, 0. 22Si, 0. 24Mn, 0.012P, 0. 003S, 0. 002Ti, adding RE 0. 10) is 40 t EAF- LF- VD- 3t ingot- breakdown 180 mm x 180 mm billet-rolled to Φ6. 5 mm coil- 500℃ lead bath quenched- Cold Drawn. The phenomenon of fracture of DY 105 steel occurs in cold drawing process, and it is obtained by analysis that partial needle-shaped martensite structure and appreciable B-type and TiN inclusions in fractured wire are main reasons to produce cold drawn fracture of wire. With the process measures including modifying Al wire deoxidation to Al wire + Al shot + C powder deoxidation, increasing soft blowing time from 15 min to 20 min, improving rare earth elements adding method and increasing Φ6.5 mm steel wire lead bath time, the phenomenon of wire fracture of the steel in cold drawn process is avoided.关键词：DY105高碳钢丝;冷拔;断裂;钢水脱氧;铅浴淬火5|0|0更新时间：2026-01-21
- 摘要：The production process flowsheet of tube bloom for 12Mn4V, 37Mn, 26CrMo48V etc steels is 150 t EAF- LF-VD-Φ210~310 mm round bloom casting. Due to the factors including argon shielding no-close etc, during 150 t ladle to 26 t tundish process the increment value of nitrogen content in liquid △N fluctuates largely, the largest △N is up to 65 x 10-6. With using the measures including improving shroud cleaning implement, increasing mechanical arm counterbalance, improving tight tough touch of ladle flow mouth and shroud, and maintaining argon flow rate 120 L/min and pressure 0.05 MPa, the increment value of nitrogen content in liquid from ladle to tundish is stably less than 5 X 10-6and the nitrogen content in casting tube bloom is 30 x 10-6~60 x 10-6.关键词：管坯;26 t中间包;钢水氮含量;长水口;氩气;保护浇注3|0|0更新时间：2026-01-21
- 摘要：The production flowsheet for developed casting round bloom of steel P11 (/% : 0. 08 ~ 0. 14C, 0. 65 ~ 0. 85Si, 0. 40 ~0. 60Mn, ≤0. 010P, ≤0. 010S, 1. 10 ~ 1. 30Cr, 0. 46 -0. 60Mo, ≤0. 015Alt) is KR metal pretreatment- 70 t top and bottom combined blown converter- LF- VD- round bloom casting process. With using the measures including controlling the elements content /% : 0. 09 ~ 0. 11C, 1.15~1. 20Cr, 0. 07 ~ 0. 08P, 0. 002 ~ 0. 005S and 0. 008 ~ 0. 015Als, controlling tundish liquid temperature (1538 ±5) ℃ , casting speed 0. 70 ~ 1. 05 m/min, secondary cooling water ratio 0. 35 ~0. 40 L/kg, strengthening temperature ≥900 °C and temperature of slow cooling pit furnace ≥500 ℃，the examination results show that the surface quality of casting bloom is qualified with rating of shrinkage cavity ≤0. 5 and rating of central porosity ≤1. 0, the P content in steel is 0. 007% ~ 0. 008% and the S content in steel is 0. 002% ~ 0. 005% , so the steel has better flowing accelerating corrosion (FAC) resistance at service temperature.5|1|0更新时间：2026-01-21
- 摘要：During refining process of steel 1Cr13 etc 400 series stainless steels in a 60 t AOD unit with direct charging hot metal, due to adding large amount of materials including ferrochromium alloy, slag-forming addition and return scrap, the required heat accounts for 15% 〜40% of the total heat of bath, that seriously restricts smooth refining and improving liquid quality. The effect of 60 t AOD lance level (1.5 ~ 3. 5 m) on CO post-combustion ratio, the effect of silicon content (1 % ~6. 5%) in ferrochrome on lime consumption and comprehensive supply of heat and the effect o£ baking time (0. 5 ~ 4. 5 h) on alloy temperature are studied by commercial production practice. Results show that with controlling 60 t AOD oxygen lance level at 3 m the CO post-combustion ratio increases to 20% ； with 4% silicon content in ferrochrome the comprehensive work efficiency is maximum ； and the time of alloy baking for 2 ~ 3 h is optimum.关键词：60 t AOD;热补偿;二次燃烧;合金烘烤;工艺实践3|0|0更新时间：2026-01-21
- 摘要：Combined with BOF ultra-low sulphur steel development experiment and production practice, the distribution of sulphur content in raw material for BOF is analyzed to get the sulphur content in hot metal with quantity of slag, scrap and lime makes up more than 70% of the total sulphur content in BOF charging. The effect of 150 t BOF top and bottom combined blowing converter [C] [O] products on end slag (FeO) and the effect of blowing time (0 ~ 15 min) , slag comprehensive basicity R(2 ~4) , ( FeO) ( 15% ~ 25% ) and BOF liquid end temperature ( 1640 ~ 1700 °C) on slagsteel sulphur partition ratio Ls= (S)/[S] are studied. Results by 20 heats non-oriented silicon steel AGW600 production show that with controlling BOF end [C] [O] products within 0. 002 8, binary slag basicity 3. 2 ~ 3. 7, BOF liquid end temperature 1675 ~ 1710 ℃ and ( FeO) in slag no more than 20% , the slag-steel sulphur partition ratio Lsis up to 7. 0, the liquid end [C] and [S] are respectively 0. 025% ~0. 048% and 0. 002 4% ~0. 005 7% and the steel products [C] and [S] are respectively 0.0012% ~ 0. 0029% and 0.002 2% ~ 0. 0047%.关键词：超低碳钢;超低硫;150t转炉;炼钢;工艺实践2|0|0更新时间：2026-01-21
- 摘要：Based on the finite element method the distribution of thermo-mechanical plastic strain of high carbon steel (0. 73% ~0. 77%C) casting slab during soft reduction process has been simulated and calculated by using ANSYS software ,the effect of reduction in height- 2 mm + 2 mm, 3 mm + 3 mm and 2 mm + 2 mm + 2 mm at defined segments on plastic strain of reduction sector and location is analyzed and the simulated results are verified at casting worksite. The results show that the plastic strain simulated values coincide with the measured values ； during hot deforming process the equivalent strain at center of slab is max, that at surface flows, and the equivalent strain at 1/4 of slab thickness is min； with increasing the reduction in height and reduction rate the thermo-mechanical plastic strain increases, and the reduction mode with 3 mm +3 mm has better reduction effect. Pilot production results show that compared with soft reduction 1. 5 mm + 1.5 mm + 1.5 mm at three segments (6#sector, 7#sector and 8#sector) before optimization, the slab center segregation and center porosity are respectively 2. 0 rating, with soft reduction 2. 2 mm +2. 3 mm at two segments (6#sector and 7#sector or 7#sector and 8#sector) after optimization, the slab center segregation and center porosity are respectively 0. 5 rating, it is obviously improving the quality of macrostructure of casting slab.关键词：高碳钢;230 mm连铸板坯;轻压下;热-机械塑性应变;冶金质量3|0|0更新时间：2026-01-21
- 摘要：The tested stainless steel 409L (/% : 0.01C, 0. 82 ~0. 86Si, 0. 26Mn, 0.002 ~0.006S, 0. 034 ~0.041P, 11.44 ~ 11. 51Cr, 0. 24 ~0. 27Ti, 0 ~0. 09Ce) is melted by a 10 kg vacuum induction furnace, forged to 30 mm x 30 mm square billet, cold rolled to 2 mm plate and annealed at 1100 ℃ for 5 min. The effect of Ce on structure annealed at 900℃ for 30 min and on thermal fatigue performance between 900 °C and ambient temperature in steel 409L has been studied. Results show that as the steel contains 0. 03%Ce, the annealed grain of steel 409L is fined and the thermal fatigue performance is best, as the Ce content in steel further increases, the annealed grains coarsen and the thermal fatigue performance of steel gradually decreases. With adding RE element Ce the TiN and TiN-Al2O3compound inclusions basically eliminate and the fined spherical titanium-nitrogen compound inclusions bearing Ce and Al-O-Ti compound inclusions bearing Ce form, and adding excessive Ce, the amount of inclusions at grain boundary increases led to decrease the thermal fatigue performance of steel.关键词：409L不锈钢;Ce;退火组织;热疲劳性能3|0|0更新时间：2026-01-21
- 摘要：The metallurgical flowsheet for steel DL05 is hot metal- PB desulphurization treatment- BOF- argon blowing- RH- 200 mm x 200 mm blooms casting-rolled to Φ6. 5 mm rod products. The effect of produced 256 heats steel DL05 chemical composition on electric conductivity ratio is analyzed, it is obtained that with increasing total content of elements in steel or increasing Mn content in steel the electric conductivity ratio decreases, but with increasing the total content elements (except Mn) the electric conductivity ratio of steel increases not obviously, therefore the effect of Mn content in steel on electric conductivity ratio is greatest. And improving the cleanliness of steel is available to improve the electric conductivity ratio of steel. With optimizing the chemical composition original control range o£ steel DL05- /% : ≤0.10C, ≤0. 10Si, ≤0. 35Mn, ≤0. 030P and ≤0. 030S to the control range- /% : ≤0. 02C, ≤0. 03Si, ≤0. 12Mn,≤0. 025P and ≤0. 015S, and effectively controlling the cleanliness of steel during RH refining, the 256 heats examination results show that the percentage of heats of electric conductivity ratio ≥16% increases from original 63. 25% to 93. 75%.关键词：DL05电缆钢;BOF-RH;导电率;Mn;化学成分2|0|0更新时间：2026-01-21
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