最新刊期
卷 32 ， 期 6 ， 2011
- 摘要：The test of pre-desulfurization technology7 of a 300-t top and bottom combined argon blowing ladle has been carried out by using a water model with geometric similarity 1 ：5. 75 water model. Results show that with same total gas flow, as compared with single blowing the top and bottom combined blowing could effectively increase the pre-slagging speed, and as flow rate of top-bottom argon blowing is 50 ： 50, the stirring condition is best ； based on the water model test results the top-bottom combined argon blowing installation for the 300 t ladle is established to realize the liquid pre-slagging desulfurization, the liquid average desulfurization ratio is 22. 29%, after refining the average end [S]is 0. 004% and the (FeO + MnO) decreases to 3. 48%.关键词：300t钢包顶底复吹氩;预成渣脱硫;水模型2|0|0更新时间：2026-01-21
- 摘要：According to the studied object of a 34-t tundish for slab concasting at steel works and based on geometric similarity principle, the 1: 3 water test model has been established and the test carried out according to orthogonal table L16(45). Test results show that relationship between primary and second for four factors in order of precedence is distance between gas box and dam, depth of dam, gas blowing rate and distance between dam and long nozzle； with optimum parameters-gas blowing rate 450 L/h, depth of dam 110 mm, distance between gas box and dam 235 mm and distance between dam and long nozzle 195 mm, the average residence time is up to 360 s, the volume fraction of dead zone decreases to 11. 47%, the volume fraction of piton zone increases to 21. 95% and the comprehensive score is up to 100. 48.关键词：中间包;底吹气;水模型2|0|0更新时间：2026-01-21
- 摘要：A water model of 1: 4 scale has been established to simulate the liquid flowing in the 210 t RH unit, and to study the effect of argon blowing rate (1 000 ~ 1 400 L/min), snorkel insertion depth (125 ~ 175 mm) and blowing argon hole number (4-6) on mixing time of liquid. Results show that to define the argon blowing rate needs to comprehensively consider the effect of each factor； it is not available to mix liquid as the snorkel inserts too depth ； it is available to get an ideal mixing time with lesser number of upper argons blowing hole and increasing the number of lower argons blowing hole ； and the optimum process parameters are argon blowing rate 3. 87 m3/h, snorkel insertion depth 120 mm, upper argon blowing hole number 4 and lower argon blowing hole number 6. The constrained nonlinear optimization question is solved by matlab tool to calculate and get regression equation minimium value of mixing time- 27. 02 s.2|0|0更新时间：2026-01-21
- 摘要：The wear curve of work roll is obtained by measuring CVC work roll wear condition in CSP line at steel works. On this basis with considering main factors to influence roll wear, the work roll wear model suited to CSP line is established and the key parameters of model are defined by MATLAB software overall situation optimized calculating-method. Calculated results by the model show that relative error between regression wear curve area and real wear curve area is 3. 78%, the correlation coefficient between measured value and calculated value is 0. 932 8, so the model is available to predict the roll wear online.2|0|0更新时间：2026-01-21
- 摘要：A coupled thermal-mechanical model including dynamic heat exchange between mold and bloom solidified shell is established by using Marc software, and the effect of radius of mold comer on thermo-mechanical behavior of bloom local shell and mold including temperature, stress and strain distribution has been analyzed. Results show that for bloom with cross section 280 mm x 380 mm the available radius of mold comer is 17. 5 ~ 20 mm, as the radius of mold corner is lower than that value the temperature gradient in local zone with 10 ~ 20 mm distance from bloom corner is larger that is unfavorable to homogeneously develop bloom shell； as the radius of mold corner is larger than that value, the greater contact normal force between mold and bloom shell leads to starlike cracks on strand.2|0|0更新时间：2026-01-21
- 摘要：At present the application of high strength steel increases obviously in body mass reduction solution scheme of car design to decrease the body mass by more than 20% , but is still lower 由an the index where using aluminium or aluminium-magnesium alloy to decrease the body mass by 40% , The future design idea for steel car body is the goal to decrease the body mass by 35% in the way of development of third generation high strength steels, new body parts manufacturing process and forming design. The characteristics of high strength steels, the body mass reduction solution scheme and selection of materials, and the grades, chemical composition, properties, application progress and forecast of high strength steels are presented in this paper.关键词：High Strength Steel;Car Body;Progress of Application5|0|0更新时间：2026-01-21
- 摘要：Steel TGM2A-S (/% : 0. 85C, 0. 27Si, 0.24Mn, 0. 026P, 0. 007S, 3. 98Cr, 4. 76Mo, 6. 09W, 1. 83V, 0. 12Nb, 0. 03RE) is a new developed high-speed steel for taps based on high-speed steel TGM2A with adding micro niobium and rare earth elements. The advanced production process flow sheet for steel TGM2A-S is 25 t EAF-30 t LF-VD (microalloying) -cast ingot (700 kg) -double heating forging (85 mm square) -continuous rolling (Φ8 mm) -cold drawing (Φ6.6 mm) -manufacturing taps (M6). Results show that the 0 and N content in steel TGM2A produced by original process- 3 t medium frequency induction furnace-ESR (280 kg ingot) -double heating forging (85 mm square) -continuous rolling (Φ8 mm) -cold drawing (Φ6. 6 mm) -manufacturing taps (M6) are respective 35. 4 x 10-6and 123. 6 x 10-6while the 0 and N in steel TGM2A-S produced by advanced process are respectively 15. 7 x 10-6and 87. 7 x 10-6. The cutting service life of taps manufactured by steel TGM2A-S increases by 20% as compared with that by steel TGM2A and the rating of grain size of quenched steel TGM2A-S is 10. 5 while that of quenched steel TGM2A produced by ESR flow sheet is 10.关键词：TGM2A-S高速钢;Nb微合金化;丝锥;使用寿命4|0|0更新时间：2026-01-21
- 摘要：The effect of casting speed (2. 8 ~3. 0 m/min), secondary cooling water flow rate (0. 83 -1.8 L/kg) and final electromagnetic stirring (0 - 400 A, 6 Hz) on phosphorus segregation in cross section of 130 mm x 130 mm casting of steel 82B (/% ： 0. 79 〜0. 81C, 0. 21 ~0. 24Si, 0. 81 〜0. 83Mn, 0.012 -0.016P, 0. 005 ~Q. 008S, 0. 25 〜 0. 30Cr) has been studied. The results show that the maximum segregation of phosphorus in billet is at the juncture of column crystal and equiaxial crystal but not at solidification center； with increasing secondary cooling water flow rate, decreasing casting speed and increasing intensity of final electromagnetic stirring, the maximum phosphorus segregation ratio decreases obviously-2|0|0更新时间：2026-01-21
- 摘要：According to transverse corner cracks occurred on 200 mm casting slab of V or V-Nb microalloying low carbon auto frame steels produced at Pangang Steel, with coniprehensive-optimized casting process parameters including decreasing the ratio heat flux between nan'ow side and broad side of slab in mold from original 0. 90 ~ 1. 10 to 0. 75 ~ 0. 85, decreasing the mold powder viscosity from 0. 20 Pa • s to 0. 16 Pa • s, stabilizing the casting speed and working condition of caster, the casting slab transverse corner crack defects significantly reduce and the hot rolled coil lines and peeling defects caused by the transverse corner cracks of slab are eliminated, therefore the percentage of changing criterion or reducing to lower grade caused by surface defects of auto frame steel hot rolled coil decreases to 0 from original 30%.2|0|0更新时间：2026-01-21
- 摘要：HRB400 high strength reinforcing steel (% ： 0. 19 ~0. 25C, 0. 40 ~0. 60Si, 1. 20 ~ 1.50Mn, ≤0.040P, ≤0. 040S) is melted by 120 t BOF-ladle argon blowing-120 mm x 120 mm billet casting process. In order to improve the comprehensive mechanical properties of Φ 12 ~22 mm ribbed bar of hot-rolled HRB4CX) steel the three kinds of microalloying process tests i. e. adding 5 kg/1 MnSiN + 0. 4 〜0. 9 kg/t FeV, 10 kg/t MnSiN + 0. 25 ~ 0. 40 kg/t FeNb and only adding 0. 40 ~0. 75 kg/t VN have been carried out during steelmaking. The pitting temperature of billet is 1 150 ~ 1 250 °C, the finishing rolling temperature for reinforcing steel bar is ≥950 °C, reduction of each pass in rough rolling ≥30% and reduction of each pass in finishing rolling ≥15%, fanning cooling after rolling. Results show that the available adding amount of FeV or VN is 0. 5 kg/t and that of FeNb is 0. 3 kg/t; with microalloying by V or Nb, the grain in steel is finer obviously and each property of reinforcing steel meets the requirement of standard.2|0|0更新时间：2026-01-21
- 摘要：Application effect of roll-type electromagnetic stirring (400 A, 1 ~ 16 Hz) in secondary cooling zone of (200 - 300) mm x (1 200 〜2 300) mm slab caster for steel Q345B, Q550D and Q345E at Baotou Steel is presented. Production practice results show that with same continuous casting process the internal quality of casting slab is improved obviously by using final electromagnetic stirring process, i. e. the average central equiaxial crystal ratio increases to 30. 3% from original 9. 7%, the central carbon segregation index reduces to 1. 01 from 1. 17 and the average A-type central segregation ratio decreases to 0. 6% from 5.1%.关键词：二冷区;辊式电磁搅拌;板坯连铸;铸坯内部质量4|0|0更新时间：2026-01-21
- 摘要：The 280 mm x 380 mm cast bloom temperature of steel U75V for heavy rail in walking beam reheating furnace has been traced and measured by using Thermophil STOR measure system (black box) at steel works, and the data are treated by Origin software to get the curves of cast bloom heating temperature, temperature increasing speed and difference of temperature between bloom surface and center etc. Results show that the average heating temperature of cast bloom is 1 220 °C , as heating time in furnace is more than 180 min, the control temperature in soaking zone should decrease by a- bout 20 °C； the effect of water-cooling beam in furnace on temperature of bloom bottom surface is obvious, therefore the control temperature of lower section in soaking zone is higher 20 °C than that of upper section ； at current heating condition, it meets the requirement of heavy rail production that temperature differential between center and surface of finished heating bloom along the thickness direction is less than 20 °C and the cast bloom temperature is more than 1 200 °C.4|0|0更新时间：2026-01-21
- 摘要：Flow sheet for X80 pipeline steel (basic composition /%: 0. 09C, 0. 42Si, 1. 85Mn, 0. 022P, 0. 005S, 0. 06Als) is KR metal desulphurization pretreatment-300 t top and bottom combined blowing converter-ladle argon blowing- LF-RH-250 mm x 2 150 mm slab casting process. The main steelmaking and refining optimizing processes are controlling converter tapping slag amount ≤4 kg/t, using (%) 55 ~60CaO, 7 ~ 12SiO3, 25 - 30Al2O3refining slag series to control LF refining slag CaO/Al2O3= 1.7 ~ 1. 9, CaO/SiO2二 4. 5 ~ 6. 0 and ( FeO + MnO)≤ 1. 0%, pre-forming slag at ladle argon blowing station with top and bottom argon blowing, RH vacuum ≤66. 7 Pa and feeding 0. 8 kg/t calcium wire after RH treatment. Results show that carbon-oxygen product-[C] [0] at converter endpoint decreases to 0. 002 44 from original 0. 002 84, after refining ( FeO + MnO) is 0. 913%, T [0] is 0. 001 3% and rating of inclusions in products is 1. 0.2|0|0更新时间：2026-01-21
- 摘要：The effect of magnesium oxide (/c/c: 97. 60MgO, 1.34CaO), Calcium Oxide (/% ： 98. 70CaO, 0. 55MgO) and alumina-magnesium) oxide (/c/c: 85. 57Al2O3,11. 36MgO, 2. 47CaO) crucible of 200 kg and 500 kg vacuum induction furnace on oxygen and sulfur content in melted nickel base alloy Inconel 690 (/% ：0. 01 - 0. 03C, 27. 0 ~ 31. 0(2r, 7. 0 ~ 11.0Fe) has been studied and analyzed. Results show that the oxygen content in alloy melted with alumina- magnesian oxide crucible is lowest i. e. (10 - 15) x 10-6[O]： with (50 - 60) x 10-6[S]; the sulfur content in alloy melted with calcium oxide crucible is lowest i. e. 10 x 10-6[S] with (27 - 48) x 10-6[O]. the sulfur content and oxygen content in alloy melted with magnesium oxide crucible are higher i.e. (50 〜60) x 10-6[S] and (24 ~ 35) x 10-6[O].2|0|0更新时间：2026-01-21
- 摘要：In thermal cvcle condition, strength, plastic modulus and reduction of area high strength weathering steel Q450NQR1 200 mm x 1 35O_ nim casting slab (/%: 0. 05 - 0. 10C, 0. 30 〜0. 50Si, 0. 80 〜1.00Mn, ≤0. 020P, ≤0. 008S, 0. 20 ~ 0. 40Cu, 0. 15 〜0. 35Ni, 0. 40 - 0. 60Cr) with heat tensile strain rate 5 x 10-3s-1at 700 〜1 000 °C have been studied and measured by using Gleeble-1500D thermo-mechanical simulator. Results show that with decreasing temperature the plastic modulus (hardening coefficient) and strength of casting slab increase, the change rate of strength of slab with temperature obviously alters at 800 °C; the reduction of area of slab at 925 ~ 700°C is ≤60% ； in order to ensure the quality of slab, during straightening process the surface temperature of slab should be controlled ≥950 °C.关键词：高强耐候钢Q450NQR1;铸坯;热回复;高温力学性能2|0|0更新时间：2026-01-21
- 摘要：The hot compression test of 12 mm hot rolled sheet of 2507 super duplex stainless steel (/% ： 0. 022C, 0. 58Si, 25. 35Cr, 7. 17Ni, 4. 05Mo, 0. 28N) with strain rate 0. 01 ~ 10 s-1at 1 000 〜1 150 °C has been carried out by using MMS-200 thermal-mechanical simulator. Test results show that at definite strain rate, with increasing deformation temperature the peak stress of 2507 super duplex stainless steel decreases: and at definite deformation temperature, with increasing strain rate the peak stress increases. Based on the constitutive equation for hot deformation, the calculated hot compression average apparent stress exponent n= 3. 25, and hot deformation activation energy Q = 460 kJ/moL According to test dada a hot deformation equation for 2507 super duplex stainless steel at corresponding deformation condition is established.关键词：超级双相不锈钢;热变形;真应力-真应变;激活能4|0|0更新时间：2026-01-21
- 摘要：The production flow sheet for Nb-Ti microalloying pipeline steel X65 (/%: 0. 07C, 1. 60Mn, 0. 35Mo) is 130 t top and bottom combined blown converter-ladle argon blowing-LF-RH-250 mm X 1 500 mm slab casting-continuous rolling to 30mm plate-control cooling process. The effect of beginning rolling temperature (890 ~940 °C) in II rolling passes, cooling temperature (780 ~ 850℃) and cooling speed (8 ~ 20 ℃/s) after rolling on tensile properties, drop-weight tear test (DWTT) performance and structure of X65 steel heavy plate has been studied. Results show that with beginning rolling temperature 940 ℃ in II rolling passes and cooling speed 20 ℃/s after rolling the main structure in X65 steel heavy plate is acicular ferrite and granular bainite, the tensile strength and yield strength of plate are respectively 665 ~ 695 MPa and 495 〜520 MPa and the DWTT fibre structure ratio of plate is about 92% to meet the requirement of standard.4|0|0更新时间：2026-01-21
- 摘要：The effect of 0. 26% ~0. 95% Al content on structure, texture and magnetic performance of 0. 5 mm cold rolled sheet of 2. 2% Si non-oriented silicon steel has been studied by a 25 kg vacuum induction furnace smelting, and forging-rolling in laboratory. Results show that as 0. 26% ~0. 81% Al, with increasing Al content in steel the grain size of annealed finished sheet increases while iron loss of sheet decreases, and as Al content in steel is more than 0. 81 %, the grain size of sheet decreases while iron loss increases, but there is no obvious regular for the effect of Al content in steel on magnetic induction performance of silicon steel sheet. The suitable Al content in 2. 2% Si non-oriented silicon steel sheet is 0. 48% ~0. 81%.2|0|0更新时间：2026-01-21
- 摘要：The test ultra-low carbon austenite stainless steel 316L (/%: 0. 010 〜0. 013C, 17. 50 〜17. 67Cr, 10. 10-10. 60Ni, 1.89 〜2. 02Mo, 0. 020 - 0. 201 N) is melted by a 200 kg vacuum induction furnace and hot rolled to 15 mm steel plate by 550 mm mill. The structure and impact toughness of steel 316L heat treated at 1 050 T for 40 min, water cooling, then at 750℃ for 25 ~ 100 h, air cooling has been studied. Results show that with increasing ageing time the impact energy of steel 316L decreases ； with same ageing time the impact energy of 0. 201% N high nitrogen steel 316L is lower than that of 0. 020% N low nitrogen steel 316L, with ageing at 750 ℃ for 100 h, the impact energies of high and low nitrogen steel 316L are respectively 40 J and 150 J ； the main precipitates in low nitrogen steel 316L are 3 ~5 μm carbides dispersed distributed at grain boundary and in grain and the main precipitates in high nitrogen steel 316L are 100 〜200 μm carbo-nitride and σ- phase distributed along grain boundary.2|0|0更新时间：2026-01-21
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