最新刊期
卷 38 ， 期 6 ， 2017
- 摘要：Based on thermodynamics on dephosphorizing oxidation reaction, the dephosphorizing equilibrium tempera ture of semi-steel by the C-P-Fe coupling action and the dephosphorizing equilibrium temperature of BOF end liquid by the P-Fe action are studied, and the temperature control model for "dephosphorization window" of double slag process is put forward. And the dephosphorizing test of 46 heats 45t top and bottom combined converter double slag process is carried out to obtain the effect of first turning-down temperature of liquid and BOF end temperature on dephosphorization rate and phosphorus distribution ratio. By theoretical calculation and process test analysis it is obtained that with present hot metal/% : 4.41C, 0.41Si, 0.19Mn, 0.128P, 0.034S, 1250~1300℃,and end liquid/% : 0.08C, 0.01Si, 0.06Mn, 0.0090P, 0.017S, 1600~1660°C and relative process conditions, by the first turning-down temperature of liquid being controlled between 1400℃ and 1440℃ and the BOF end temperature being controlled between 1610℃ and 1650℃ the dephosphorization rate in first turning-down period is up to 62.1% , the end dephosphorization rale of liquid is up to 93.9% , and the end phosphorus content in liquid decreases from original 0.0090% to 0.0078% .关键词：顶底复吹转炉;双渣工艺;脱磷热力学;一次倒炉钢液温度;终点温度;控制模型2|0|0更新时间：2026-01-21
- 摘要：The electroslag-remelting (ESR) test on steel Cr13Mn4Mo by 70CaF2-30Al2O3slag series has been carried out. The total oxygen content, sulfur content and amount, size and morphology of inclusions in Ф55mm electrode and Ф120mm (36kg) ESR ingot are analyzed and measured by SEM/EDS, oxygen-nitrogen determinator and carbon-sulfur analyzer, and the thermodynamic analysis on MnS inclusions precipitation process in steel is carried out. Results show that by ESR the total oxygen content in steel decreases from 0.0121% to 0.0044%, sulfur content in steel decreases from 0.010% to 0.002% , as compared with electrode the number per mm2of inclusions in ESR ingot decreases from 855 to 257 and the size of inclusions in ESR ingot decreases obviously which are about 1μmAl2O3and compound inclusions with Al2O3core surrounded by MnS at outside. Thermodynamic calculated results show that in test conditions there is no single MnS formation that agrees with SEM/EDS analysis results.关键词：电渣重熔;Cr13Mn4Mo不锈钢;夹杂物演变;MnS;二次枝晶臂2|0|0更新时间：2026-01-21
- 摘要：The steelmaking flowsheet of tested casting bloom of steel Q420C (/%: 0.18C, 0.34Si, 1.40Mn, 0.013P, 0.011S, 0. 066V, 0.018Als, 0.0110N) is 80t BOF-LF-CC process. The hot ductility of casting bloom of steel Q420C at 600~1400°C is tested by using Gleeble-1500D thermal simulator and the morphology of fracture and structure of steel is analyzed by optical, scanning- and transmission-electron microscope to study effect of the solidification segregation and precipitates on hot ductility of casting bloom. Results show that of steel Q420C the I brittle zone is >1250~1350°C and the Ⅲ brittle zone is 700~1050 °C , and at 1050~1250℃ the steel has better ductility with reduction of area more than 60%, Commercial pilot production results show that with controlling Als content in steel 0.015%~0.020% , properly decreasing ratio of secondary cooling water to 7~8t/h at feet roller zone, 5.5~6.5t/h at Ⅰ zone and 14±1t/h at support roller zone, and controlling straightening temperature of casting bloom ≥1050℃, the cracking ratio of rolled products decreasing from original 45.3% to 4.6%.关键词：V-微合金化钢Q420C;热塑性;析出物;断口形貌6|0|0更新时间：2026-01-21
- 摘要：The commercial pilot production and analysis on replacing partial lime in slag by limestone in 60t BOF steelmaking at Tangsteel have been carried out. Results show that of heats with limestone replacement ratio 7%~33% the energy consumption saving is 1.45~6.90kg standard coal per ton steel by estimated calculation；with replacing partial lime by limestone the average end [P] is 0.02% and average dephosphorization rate is up to 83.13%；with tapping liquid temperature increasing the dephosphorization rate in heats replacing partial lime by limestone decreases that meets the law of thermodynamics；and compared with CaO charging amount 51.99kg per ton steel of heats by lime slagging, the CaO charging amount is 51.67kg per ton steel slagging by limestone to replace partial lime which shows no-obvious silicon volatile phenomenon.关键词：60t顶底复吹转炉;石灰石替代部分石灰;脱磷;造渣;炼钢;渣量2|0|0更新时间：2026-01-21
- 摘要：Of tested Ti-IF steel (/%：≤0.0035C, ≤0.03Si, 0.08~0.20Mn, ≤0.025P, ≤0.015S, 0.05〜0.07Ti, 0.030~0.055Als, ≤0.0040N) the BOF end [C] is 0.03%〜0.06%, end [O] is 0.0030%~0.0060% , the lime and top slag modification agent containing aluminium are added during lapping process, and the ingredient of RH end slag is/%: 53.38CaO, 7.05FeO, 1.01MnO, 31.4Al2O35.7MgO, 0.3P2O50.022S. The analysis results by sampling in RH refining process show that by adding top slag modification agent to control 8% (FeO+MnO) and CaO/Al2O3=1.7, it is available to remove the inclusions in steel；the oxygen content in liquid decreases continuously during refining process, in casting slab the oxygen content is 0.0014% and the nitrogen content is 0.0015%；at finishing decarburization the main inclusions in steel is MnO, at finishing deoxidation by aluminium the main inclusions in steel is Al2O3and after alloying modified to Al2O3and Al-O-Ti compound inclusions；and in slab casting the above-mentioned inclusions are removed effectively but the TiN inclusions precipitated in slab solidification process.关键词：300t-BOF-RH-CC流程;Ti-IF钢;夹杂物;衍变行为2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet for cold-drawn tube of steel 25Mn(/%: 0.24C, 0.25Si, 0.87Mn, 0.016P, 0.011S) is hot-metal pretreatment-90t EAF-LF-VD-Φ250mm round bloom HCC-piercing-hol rolling to Φ197mmx17mm tube-cold rolling to Φ185mmx13mm tube. The mottled spots delect of internal surface of steel 25Mn cold-drawn tube is analyzed by using optical microscope, scanning electron microscope (SEM) , energy spectnam meter and electron probe analyzer. Results show that the mottled spots defect is warped skin and concave pitting；the warped skin defect is caused by aggregated CaO-Al2O3-(MgO) compound inclusions which deformation is different from base steel and the aggregated growing up of Al2O3-MnS-CaS compound inclusions fall off in cutting process to form concave pitting. With optimizing the original aluminium deoxidizing process to silico-calcium alloy deoxidizing process, decreasing the refining slag basicity from original 6.76 to 2.26, increasing the refining slag (MgO) from 5.33% to 7.23% and decreasing the ( Al2O3) from 26.05% to 12.76% to modify the brittle inclusions in steel to silicate inclusions with better ductility, therefore the internal mottled spots defect of internal surface of steel 25Mn cold-drawn tube is eliminated.关键词：25Mn钢;Φ185mmx13mm冷拔管;麻点状缺陷;复合夹杂;硅钙线脱氧;精炼渣碱度2|0|0更新时间：2026-01-21
- 摘要：After revamping 45t AOD unit at TiSCO in 2004, due to decreasing of AOD furnace volume ratio with new furnace shell the steel spitting is serious in earlier refining period led to larger loss of metal and alloy. With the measures including in earlier decarburization period at prerequisite to insure basic basicity of slag, the amount of lime decreases from original 20% to 10% and the adding times of lime increases from original 5 times to 8 times, and in decarburization later period the nitrogen (argon) and oxygen flow rate decrease respectively from original 2040m3/h and 1020m3/h to 1800m3/h and 1000m3/h, the spitting in AOD refining process decreases obviously, the consumption of ferrosilicon decreases by 0.6 kg/t, the yield of metal increases from 96.7% to 98.4% and the refining time reduces by 3min.关键词：45tAOD;奥氏体不锈钢;精炼过程喷溅;工艺改进;金属收得率2|0|0更新时间：2026-01-21
- 摘要：Production practice at steel works shows that the surface quality of hot-rolled strip with thickness less than 9mm is better but the surface iron scale of hot-rolled strip with thickness more than 9mm is thick easily to come off during uncoiling process and press-in surface led to dent defect, and its structure is loose easily to absorb moisture from air led to rust spot and mottled spot defects. The oxidation process, forming mechanism in process and forced condition in uncoiling of iron scale are analyzed, and the control technology of iron scale thickness and structure is put forward. The results pilot production of 9.5mm hot-rolled strip coil of steel SPHC (/%: 0.02〜0.06C, ≤0.10Si, 0.20~0.50Mn, ≤0.035P, ≤0.035S, ≤0.01Alt) show that with the process measures including decreasing heating temperature from 1200℃ to 1180 °C , increasing outlet temperature and rolling speed of finishing rolling respectively from 860°C and 5.0 m/s to 880°C and 6.5 m/s, decreasing coiling temperature from 600℃ to 520℃ , and single-stocking of coil, the scale thickness of steel strip decreases from original 10.093~18.94μm to 6.613μm, the iron scale come off phenomenon is no-occurrence at production situ and the surface dent defects of strip after pickling decreases markedly.关键词：低碳钢SPHC;9.5mm带卷;氧化铁皮;控制技术2|0|0更新时间：2026-01-21
- 摘要：The effect of single roll soft reduction (6~20mm) and reduction position (1#〜6#roll) on central carbon segregation and macrostructure of 180mmx180mm casting billet of high carbon steel SWRH92B (/%: 0.71C, 0.22Si, 0.64Mn, 0.010P, 0.006S) has been tested and studied. Results show that as solid fraction fs is 0.45~0.63 the soft reduction is available to decrease central carbon segregation of casting billet, and as the solid fraction fs is more than 0.82 the shrinkage cavity of billet can not be eliminated and the central carbon segregation can not be decreased； in condition of soft reduction 6~20mm, with increasing reduction the central carbon segregation decreases from 1.15 to 1.04, and the cracks occur easily in billet as the soft reduction is more than 15mm；compared with weak secondary cooling ( water ratio 0.65L/kg) and the ultra weak secondary cooling ( water ratio 0.40L/kg) is more favorable to control central carbon segregation；by comprehensive analysis it is obtained that with casting speed 1.3 m/min, mold stirring 300A and 5Hz, and secondary cooling water ratio 0.40 L/kg, the central carbon segregation and macrostructure of steel SWRH72B 180mmx180mm casting billet are better by single roll soft reduction 15mm at 5#roll.关键词：高碳钢SWRH72B;180mmx180mm铸坯;碳偏析;单辗轻压下;低倍组织3|1|0更新时间：2026-01-21
- 摘要：According to the phenomenon of occurring bainite and martensite in structure of Ф6.5~12mm coil of steel SCM435 rolling in winter season led to higher cracking rate of wire and rod, the analysis on continuous cooling transformation curves of austenite measured by Gleeble-1500 hot simulator and morphology of structure according with cooling rale 0.5~30°C/s has been carried out to get the cooling rate for forming structure of ferrite + pearlite being ≤0.5°C/s；by measuring the cooling rate of Ф6.5~12mm coil of steel SCM435 and observing the corresponding structure, it is found that the temperature of coil leaving insulation cover is ≥600°C with cooling rate 0.8〜4℃/s led to the structure of steel being ferrite + pearlite and partial bainite and martensite. With adjusting loop laying temperature and Stelmor Z1〜Z3 cooling roller speed in wind cooling line for Ф6.5~12mm coil of steel SCM435, the temperature of coil leaving insulation cover is ≤550℃ and the austenite structure of steel is transformed completely into ferrite + pearlite, as a result the cold-heading cracking rate of coil decreases from original 20% to less than 3%.关键词：SCM435钢;盘条;冷锹开裂;CCT曲线;冷却速度;铁素体+珠光体;贝氏体;马氏体3|0|0更新时间：2026-01-21
- 摘要：According to the issue of high phosphorus content in liquid with great fluctuation at end-point of converter, the difficult points for control of deep dephosphorization of liquid and the influence factors on dephosphorization are analyzed ,and to use the deep dephosphorization process scheme of “double slagging catch carbon method” is proposed. With the dephosphorization measures including optimizing slagging, oxygen supplying, bottom gas blowing and lance level and end point control, the results of 9 heats of steel 34CrMo4 steelmaking shows that the dephosphorization rate of liquid is up to 84.6% , the end slag-steel phosphor partition ratio Lp is up to 90.1 to realize the stable control on converter liquid end [P]≤0.006% , and with using the technology measures of skateboard and reformed top slag to reduce rephosphorization, the ability of batch steelmaking low phosphorus steel with phosphorus content less than 0. 010% is qualified.关键词：200t顶底复吹转炉;半钢冶炼;干法除尘;转炉脱磷;工艺实践3|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of Ф6.5~20mm coil of cold-heading steel SWRCH35K is 120t LD-LF-180mmx180mm billet casting-rolling. The effect of composition, structure, surface quality of casting billet, inclusions in steel and rolling process on cold-heading properties of steel SWRCH35K (/%: 0.35~0.37C, 0.11~0.14Si, 0.71~0.72Mn, 0. 016~0.023P, 0.005~0.007S, 0.023 ~0.030Alt) has been analyzed to get the main reasons to cause coldheading cracks are cold-heading steel coil surface crack defects and near surface large scale inclusions. By using the measures including increasing amount of pre-deoxidizing aluminium pig in LD tapping from 120~150kg to 160~180kg, increasing LF end slag basicity from 3.0 to 3.5 and decreasing ( FeO+MnO) from ≤1.5% to ≤1.2% , decreasing supperheating extent of liquid from 20~40℃ to 20~35°C and increasing finish rolling temperature and finishing temperature respectively from 940°C and 860℃ to 950℃ and 880℃，the cold-heading cracking rate of steel decreases from 18.60% to 5.80%.关键词：120tLD-LF-CC-轧制流程;SWRCH35K钢;冷锹开裂;分析;工艺优化2|0|0更新时间：2026-01-21
- 摘要：The electrodes of tested Incoloy825 alloy (/%: 0.01C, 0. 21Si, 0.41Mn, 0.007S, 0.019P, 22.33Cr, 39.08Ni, 3.04Mo, 2.14Cu, 1.17Ti, 0.17Al) are melted by 3t medium frequency induction furnace + 3t AOD, and the 280mmx325mm withdrawing blooms (/%: 0.01C, 0.21~0.23Si, 0.40Mn, 0.005S, 0.023~0.024P, 22.48~22.50Cr, 39.10~39.13Ni, 3.05~3.07Mo, 2.14~2.15Cu, 1.00~ 1.10Ti, 0.15~0.18Al) are remelted by ESR process. The test results show that during ESR bloom withdrawing process of Incoloy825 alloy, due to Ti burning loss the TiO2content in slag increases continuously and the viscosity of slag also uninterrupted increases led to difficult separation of slag and steel. By improving ingredient of slag for withdrawing bloom ESR, using (/%) 57CaF215CaO, 5MgO, 15Al2O35SiO23TiO2slag series and controlling electrode melting rate 680kg/h and adding aluminium shot 0.43 kg/t in ESR process to control Ti burning loss, the surface quality of casting bloom of Incoloy825 alloy improves obviously.关键词：耐蚀合金;Incoloy825;280mmx325mm坯;抽锭电渣重熔;表面质量2|0|0更新时间：2026-01-21
- 摘要：The production process of Ф5.5~15mm wire rod of stainless steel 0Cr13C is 60t medium frequency induction fumace-90t AOD-LF-180mmx180mm billet casting-continuous rolling. The surface “exposed crystal” defect of wire rod of steel 0Cr13C (/%: 0.021C, 0.32Si, 0.35Mn, 0.030P, 0.004S, 12.10Cr) is analyzed by optical and scanning electron microscope to get the defects take its source at mixed crystal due to (a) large overheating extent of casting liquid and small secondary cooling water rate led to larger dendritic inter-planar spacing of ferrite in casting billet and (b) higher temperature in heating furnace led to abnormal growth of ferrite grains in steel. With the process measures including decreasing overheating extent of liquid in tundish to 30℃ from 50℃ , decreasing casting speed of billet to 1.0m/min from original 1.2m/min, improving electromagnetic stirring to 280A-6Hz from original 150A-3Hz, increasing secondary water cooling rate to 0.33L/kg from 0.19L/kg and reducing casting billet heating temperature to 1020℃ from original 1080~1130℃，the surface “exposed crystal” defects of wire rod are avoided.关键词：0Cr13C不锈钢;线材;混晶;表面缺陷;工艺改进2|0|0更新时间：2026-01-21
- 摘要：The 3.5mm hot-rolled plate of stainless steel 06Cr13 (/%：0.03C,0.45Si,0.22Mn,0.020P,0.002S, 12.20Cr) cold-rolls down to 0.375mm cold-rolled sheet by 11 passes. The effect of 800~925℃ annealing on texture ingredient and mechanical properties of stainless steel 06Cr13 cold-rolled sheet has been studied by using CCT-AV-Ⅱ simulation continuous annealing unit. Results show that with increasing annealing temperature the amount of {111} fiber texture being favourable for deep drawability increases, while the sum of amounts of {001}<110> ,{114}<111> ,{112}<110> , {112}<111> and {110}<110> texture being unfavourable for deep drawability decreases；as annealing at 875°C , difference between{111}<110> and {111}<112> texture ingredient is largest and the uniformity of {111} fiber texture is poorest；and the obvious anisotropy of strength and elongation of stainless steel 06Cr13 cold-rolledtor sheet annealed at 875℃ occurs. Based on comprehensive analysis the suitable annealing temperature for stainless steel 06Cr13 cold-rolled sheet is (850土10)℃.关键词：06Cr13不锈钢;冷轧板;退火温度;织构;力学性能2|0|0更新时间：2026-01-21
- 摘要：The production process flowsheet of tested steel 16MnT (/%: 0.14~0.15C, 0.27〜0.30Si, 1.40Mn, 0.008~0.010P, 0.003~0.004S, 0.020~0.025Nb, 0.10V, 0.002〜0.08Ti, 0.025~0.027Al, 0.0043~0.0053N) is 60t EAF-LF-VD-5.8 t ingot casting-Ф190~250mm forging- normalizing at 920℃. Examination results show that the impact energy of forged-normalized 0.08%Ti steel 16MnT at -20°C is 6~16J, it is lower than the value of standard requirement-34J. The analysis results obtain that large amount TiN and along grain boundary precipitated phase Nb-Ti ( C, N) exist in 0.08%Ti steel and the fracture of steel at -20T is typical brittle fracture along grain boundary, and the structure of forged product section is non-homogeneous, at surface it is sorbite while at centre of section it is ferrite+pearlite. With decreasing the Ti content in steel to 0.002% and controlling the 1.5m distance between forgings during normalizing wind-fog cooling process, the impact energy of forged product of steel 16MnT at -20℃ increases to 132~288J.关键词：Ti;微合金电机轴用钢16MnT;锻材;正火工艺;低温冲击性能4|0|0更新时间：2026-01-21
- 摘要：According to the phenomenon of segregation and conglomeration of carbides in annealed steel 3Cr17Mo (/%: 0.25C, 16.5Cr, 0.60Mn, 0.60Si, 1.0Mo, 0.020P, 0.005S) , the orthogonal experiments and discrete data analysis on effect of pre-cooling heating temperature (870~960°C., oil-cooling to 450℃),pre-cooling times (1~4) and holding time (1~4h) on structure of steel have been carried out to study the effect of repeated pre-cooling heat treatment on spheroidizing structure of steel 3Cr17Mo. It is obtained that 900~910℃ double pre-cooling heat treatment is available to decrease the time of heat treatment and get structure with uniform and fine carbides. The test results show that as compared with normal annealing process-860°C for 4h, furnace cooling to 500℃ , air cooling, the spheroidizing carbides in steel with double 900~910°C. for 30min, oil-cooling to 450℃+ annealing at 730℃ 2h and furnace cooling to 400°C air cooling is more uniform and fine, its comprehensive mechanical properties improve obviously.关键词：马氏体不锈钢3Cr17Mo;碳化物球化组织;预冷热处理;等温球化退火2|0|0更新时间：2026-01-21
- 摘要：The tested steel M54 (/%：0.28~0.32C, ≤0.10Si, ≤0.10Mn, ≤0.005S, ≤0.008P, 9.5~10.5Ni, 6.6~7.4Co, 1.8~2.2Mo, 1.1~1.5W, 0.7~1.3Cr, 0.04~0.16V) is melted by 5.8t vacuum induction furnace +2.2t vacuum consumable electrode furnace, and forged to Ф170mm bar products. The Ф5mm test specimens cut at 1/2R of forged bar are treated by solid solution treatment at 1075°C for 90min, air cooling and at 1060℃ for 75min, oil cooling + deep-cooling treatment at -73 for 120min + aged treatment at 400~600℃ for 300min, air cooling. The effect of aging temperature on mechanical properties and structure of secondary-hardening ultra-high strength steel M54 is studied and analyzed by optical and scanning electron microscope etc. Results show that tested steel M54 aged at 520°C for 300min has excellent comprehensive mechanical properties-tensile strength 2040MPa, impact energy 62J and fracture toughness 110MPa·m1/2with aging at 560°C the morphology of intergranular fracture occurs in steel and the impact energy KU2and fracture toughness KICof the steel decrease respectively to 26J and 80.6MPa·m1/2and with increasing aging temperature to 600°C the impact energy KU2and fracture toughness KICof tested steel increase respectively to 56J and 131MPa·m1/2.关键词：超高强度钢M54;时效温度;二次硬化;力学性能;复合夹杂物2|0|0更新时间：2026-01-21
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