最新刊期
卷 36 ， 期 3 ， 2015
- 摘要：The steel 25 CrMpVNi is produced by 120 t EAF-LF-RH degassing-φ600 mm round bloom casting process with adding Al to pre-deoxidize during EAF tapping, and get [ Al ] s 0. 030% and adding lime slagging for pre-refining, adding aluminium shot at surface of refining slag (/% : 53 - 57CaO, 10 -13SiO227 -28Al2O36 - 9MgO, 0. 09 - 0. 10MnO) for diffusion deoxidation during LF refining. The RH degassing refining results show that at end RH process the T[O] decreases from begining RH 0. 0013% - 0. 001 5% to 0.0005% ; TCa in steel decreases From 0.001 9% to 0.000 9% - 0. 001 7% ； the inclusions transform from MgO· Al2O3to ( MgO) z ( CaO) x ( Al2O3) y and into ( CaO)x (Al2O3)y, finally the amount of spinel type solid, phase inclusions decreases rapidly, the amount of calcium aluminate type liquid phase inclusions increases first and then decreases, and the number density of inclusions in steel decreases from 6. 7/mm2to 2. 7/mm2.关键词：120 t EAF-LF-RH-CC流程;RH脱气;超低氧高铁车轴钢;夹杂物;尖晶石2|0|0更新时间：2026-01-21
- 摘要：The effect of parameters including adding amount (650 〜950 kg) of desulfiirizer (/% ： 80. 55CaO, 0. 04S, 0. 01P, 4. 34SiO26. 06CaF20. 05H2O) , stirring time (7 ~ 11 min) , stirring impeller rotating speed (90 〜110 r/min) and submerged depth of impeller (850 ~ 1 150 mm) on efficiency of KR desulphurization of 115 ~ 117 t hot metal (0. 03% ~ 0. 06% S, 1 250 〜1 350 ℃ ) has been statistic-analyzed and studied by using response surface method ( RSM), and a equation of regression model is obtained. Results show that with using the optimized parameters- adding amount of desulfurizer 820 kg, stirring for 9 min, rotating speed of stirring impeller 101 r/min and submerged depth of impeller in bath 985 mm, with hot metal KR desulphurization the predicted value of efficiency of desulphurization is 91. 99% , while the real measured value is 90. 18% , the relative error is 2. 0% ； with optimized desulphurization process the consumption of used desulfurizer decreases and the first qualified rate of metal increases from original 88. 35% to 95. 88%.关键词：铁水预处理;KR脱硫;脱硫效率;响应曲面2|0|0更新时间：2026-01-21
- 摘要：The progress of research on Mn, Si, Cr, Mo and Al content in high carbon chromium bearing steel, and heat treatment process including martensite quenching-tempering, bainite austempering, bainite-martensite and martensitebainite quenching, as well as nanometer-structured bainite steel for bearing are presented in this article. The nano-structured bainite with high strength, high plasticity and high impact toughness is developed in recent decade, the steel with special structure-nanometer ultra fine bainite ferrite lath and carbon-rich residual austenite film in steel has excellent wearing and contact fatigue properties, so the nano-bainite bearing steel has better application prospect.关键词：高碳铬轴承钢;成分设计;热处理;纳米贝氏体;进展4|0|0更新时间：2026-01-21
- 摘要：The 100 t RH vacuum refining unit is equipped with RH-WPB water-cooling top lance powder injection system, the set of powder inject system has one-time largest injection volume 2 000 kg with theory max injection rate 250 kg/min and using injecting powder desulfurizer 80CaO/20CaF2. The RH-WPB treated results on steel 14Mn5V, steel 30CrMnSi and steel 27CrMo27VS show that after RH powder injection treatment the sulphur content in liquid decreases respectively from 42 x 10-628 x 10-6and 39 x 10-6to 28x 10-615 x 10-6and 22 x 10-6it has obviously desulphurization effect.关键词：RH真空精炼;喷粉系统;喷吹罐;喷吹速度;脱硫率5|0|0更新时间：2026-01-21
- 摘要：The production flowsheet for anchor steel CM690 is hot metal pretreatment-80 t BOF-LF-RH-200 mm x 200 mm billet casting-rolling to φ50 mm round bar process. The products analysis results show that during acid etching process the string cluster MnS and TiN inclusions with around banded rich carbon structure in steel CM690 (/% : 0. 29C, 0. 21 Si, 1. 58Mn, 0. 017P, 0. 012S, 0. 017Ti) are corroded to form capillary crack defect, and the rich carbon bainite and pearlite also corroded gradually. With controlling RH end [ S] 0.004% ~ 0.007% , decreasing [N] from original 55 x 10-6~ 70 x 10-6to 40 x 10-6~50 x 10-6decreasing liquid superheating extent from 25 ~ 40 ℃ to 25 ~ 35 °C , controlling casting speed 1. 3 m/min and increasing secondary cooling water ratio from 0. 35 L/kg to 0. 40 L/kg, the capillary crack defects in steel products are basically eliminated.关键词：CM690锚链钢;发纹;MnS;TiN;带状组织2|0|0更新时间：2026-01-21
- 摘要：The statistics and regression analysis on the effect of diameter of ESR ingot (Φ250 mm ~ Φ400 mm) and reduction ratio (11. 10 ~92.46) of high speed steel M2 (/% : 0.85 - 0.90C, 5.8 - 6.2W, 4. 6 - 5.0Mo, 3.8- 4.4Cr, 1.75 -1.95V) on non-uniformity of carbide in steel products (Φ26 mm - Φ120 mm) have been carried out, and a regression equation to predict the rating of non-uniformity of carbide in products is established. Results show that as reduction ratio is less than 20, with increasing reduction ratio the non-uniformity of carbide in steel decreases markedly, while as reduction ratio is more than 20, with increasing reduction ratio the non-uniformity of carbide in steel decreases lesser； with same reduction ratio the rating of carbide non-uniformity in smaller diameter steel forged and rolled products is smaller.关键词：高速钢M2;电渣重熔;锭型;压缩比;碳化物不均匀度5|0|0更新时间：2026-01-21
- 摘要：Based on classical theory for oxygen lance design it is obtained of oxygen lance nozzle with 5 holes for 180 t converter the diameter of inlet 55 mm, the diameter of throat 37. 2 mm, the diameter of outlet 50. 8 mm, the length of contracting section 44. 6 mm, the length of expanding section 97. 2 mm and the length of throat 5 mm ； with using CFD fluid imitation software to simulate the injecting fluid field of oxygen lance with 13°- 17° nozzle at same environmental temperature ,it is obtained for 180 t converter the optimum nozzle angle is 15°its injecting fluid has stronger immersion ability and larger effective impact area.关键词：180 t转炉;氧枪;喷孔夹角;数值模拟;优化2|0|0更新时间：2026-01-21
- 摘要：With the process measures including using arc furnace heels operation, controlling EAF end [ C ] ≥ 0. 10% , LF refining white slag time ≥30 min, using hardenability calculated model to micro-adjusting the elements content in liquid, controlling tundish liquid overheating extent 15 ~30 °C , mold, strands and end electromagnetic stirring, the oxygen content in pilot production of Φ110 mm ~ Φ150 mm gear steel 22CrMoH (/% : 0.20-0.22C, 0.26- 0.28Si, 0.73-0.75Mn, 0.007-0.012P, 0.001 -0.004S, 1.05-1.09Cr, 0.37-0.39Mo) is 8x10-6-10x10-6the rolled products J15△HRC value ≤4, the rating of inclusions ≤1. 0, and the rating of macro-structure ≤1. 0.关键词：22CrMoH齿轮钢;110 t EAF-LF-RH-CC流程;淬透性带宽;氧含量;试制3|1|0更新时间：2026-01-21
- 摘要：The flowsheet for steel SPHC (/% : ≤0.08C, ≤0. 05Si, 0. 10 ~0. 30Mn, ≤0, 025P, ≤0.025S, 0. 020 ~0. 045Al) is hot metal pretreatment- 150 t top and bottom combined blown converter- LF- double strand slab casting process- 1 780 mm hot continuous rolling process. By analysis on nozzle blocking substance it is obtained that the main ingredient of blocking substance is Al2O3and high melting point (1 750 ℃ ) CaO·2Al2O3inclusion, the outlet of blocking substance is piled up alumina with loose structure, the middle layer is net type alumina and the inner layer is decarburized zone of nozzle materials. With the process measures including controlling converter end [C] > 0. 04% , adjusting feeding calcium wire amount to increase the liquid average calcium-aluminium ratio from 0. 03 to 0. 06, increasing soft argon blowing time from 6 ~ 8 min to 8 ~ 10 min and preventing liquid secondary oxidizing in casting process, the results of 48 heats steel SPHC production show that the nozzle blocking accidents are averted.关键词：SPHC钢;浸入式水口结瘤;Al2O3夹杂物;钙处理;工艺改善2|0|0更新时间：2026-01-21
-
Heat Treatment Process of 245 mm Heavy Plate of Steel S500Q-Z35 for Seat Ring of Hydro-Power Station
摘要：245 mm plate of steel S500Q-Z35 (/% : 0. 13C, 0. 25Si, 0. 007P, 0. 001S, 0.010Al, 0. 39Cr, 0. 92Ni, 0. 44Mo, 0. 02Nb, 0. 01Ti, 0, 54Ceq) is produced by KR desulphurized hot metal-120 t BOF-LF-VD-42 t ingot castingrolling-heat treatment process. According to principle of control of grain growth, the measuring CCT curves and critical thickness, as well as process test are carried out, it is obtained that with pre-quenching process-rapidly heating to 930 ℃ for 2. 0 min/mm, quickly cooling to 670 °C , the sub-critical quenching-rapidly heating to 880 ℃ for 2. 4 min/mm, with circle water + gas stirring cooling to ambient, and tempering treatment at 620 ~ 630 ℃ for 4 min/mm, air cooling to 400 ℃ and flatting, the surface structure of 245 mm heavy plate of steel S500Q-Z35 is sorbite, the structure in other parts is tempered bainite + ferrite, it has better comprehensive mechanical properties and has better properties of plate Z-direction.关键词：S500Q-Z35钢;245 mm特厚板;亚温淬火;力学性能2|0|0更新时间：2026-01-21 - 摘要：The amount and distribution of inclusions in casting slab of ultra-low carbon steel ( ≤0. 01% C) processing in 210 t ladle with and without adding modifying agent (/% : 38 ~43Al, 20~30Al2O327 ~ 31 CaO, ≤6SiO2≤6MgO) to ladle top slag have been examined and analyzed, and the effect of modifying agent on oxygen equilibrium between steel and slag and inclusions in casting slab is studied by thermodynamic analysis. Results show that the ingredient of refining slag sample for ladle top slag without adding modifying agent is (/% ) 25. 55 ~ 39. 68CaO, 8. 51 ~15. 14SiO26. 34 ~ 27.09MgO, 5. 92 ~6. 54Al2O317. 32 ~22, 24FeO, 3. 86 ~7. 35MnO, and ingredient of refining slag sample for ladle top slag with adding modifying agent is (/% ) 34.36 ~ 40. 43CaO, 7. 69 ~11.47SiO26. 42 ~7. 31MgO, 8.31 ~ 25. 54Al2O311.94 ~ 20. 78FeO, 2. 17 ~ 2. 63MnO； with using ladle top slag modification treatment, the actual activity coefficient a(FeO)in slag is less than that in equilibrium with dissolved oxygen in steel led to oxygen diffusion from steel to slag through the interface of metal-slag, thus to lower the activity of oxygen in liquid, obviously improve the cleanliness of liquid and decrease the amount and size of inclusions in casting slab, and markedly reduce the nozzle clogging occurrence. Besides, although the decrease of a(FeO)in slag is small, whereas the activity of oxygen in liquid decreases significantly.关键词：顶渣改质;杂物;超低碳钢;氧活度;水口堵塞2|0|0更新时间：2026-01-21
- 摘要：The structure and mechanical properties o£ test steel (/% : 0. 22C, 1. 46 ~ 1. 66Mn, 0. 45 ~0. 58Si, 0. 011 ~ 0. 013S, 0. 010 ~0. 012P, 0. 014 ~ 0. 047V, 0. 040 ~0. 044N) melted by vacuum induction furnace cast to 10 kg ingot, forged to 25 mm x 25 mm billet, heat-treated at 870 °C for 40 min, air cooling and natural aged for 180 days are observed and tested. Results show that after natural ageing the grains in high nitrogen steel 20MnSi is fined with grain diameter 0. 8 ~ 6 μm and banded structure disappearing, due to V ( CN) precipitation its yield strength increases by 25 ~ 93 MPa, tensile strength increases by 17 ~ 157 MPa, elongation increases from original 9% ~ 15% to 26. 0% ~31. 5% ； and after natural ageing the brittlement zone in test steel disappears.关键词：20MnSi钢;高氮;钒;时效;组织;力学性能3|0|0更新时间：2026-01-21
- 摘要：The flowsheet of Φ11. 8 mm cold drawn spring steel (/% : 0. 58C, 1. 77Si, 0. 79Mn, 0. 15Cr, 0. 015P, 0. 005S) is 80 t LD-LF-VD-hot rolled Φ12 mm coil-cold drawing process. The metallographic, mechanical and structural analyses on fracture of spring during coiling spring show that the surface quality of hot rolled products and mechanical properties of cold drawn spring steel are better； the large nonmetallic inclusions with size more than 20 μm in steel and the surface scratch during cold drawing process are causes of fracture of spring during coiling manufacture; the control of large inclusions produced in steel and the improvement of cold drawing lubrication process to avoid deep scratch are available to prevent occurrence of fracture.关键词：60Si2MnA弹簧钢;卷簧断裂;夹杂物;表面质量2|0|0更新时间：2026-01-21
- 摘要：With using hot wire method to get the mould fluxes continuous cooling transformation (CCT) and time-temperature transformation (TTT) curves and using polarizing microscope combined with X-ray diffraction analysis, the effect of fluorite content (8% ~ 16% ) on crystallization properties of thin slab casting mould fluxes with basicity 1. 0 has been studied. Results show that with increasing fluorite content by each 2% , the average critical cooling rate increases by 2. 5 ℃. ； at same cooling rate with increasing fluorite content in mould fluxes, the mould fluxes crystallization temperature raises and the crystallization rate increases, they are favourable to improve the interfacial thermal resistance, control the heat transfer of slag film and decrease the forming of surface crack of casting slab; as the fluorite content is more than 14% , large amount of crystalline mineral cuspidine forms in slag film, for the steel grades with higher casting lubricating requirement ,it should be to control the fluorite content in fluxes no less than 14%.关键词：保护渣;萤石含量;连续冷却转变;时间-温度转变;结晶率5|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of Φ 16mm product of spring steel 60Si2CrVAT (/% : 0. 58C, 1.76Si, 0. 66Mn, 0. 010P, 0. 005S, 1. 15Cr, 0. 15V) is BOF-LF-VD-22Q mm x300 mm bloom casting-rolling-annealing process. The main manufacturing process of spring for railway freight train is punching machine unloading-medium frequency induction heating- hot coiling spring-residual heat quenching ( 890 ~ 870 °C , oil cooling) -530 °C tempering in electric resistance furnace-grinding-shot blasting-pre-compression process. The cause of fracture of Φ16 mm K6 spring with 620 000 times in fatigue test (standard requirement ≥3 000 000 times) is analyzed. Results show that the hurt at point-contact between spring supporting ring and effective ring led to stress concentration is main cause of earlier fatigue fracture, while the abnormal lower bainite existing at local region of spring is disadvantage for spring fatigue life. With improving spring manufacturing process including insuring supporting ring size and controlling spring quenching temperature, preventing local point contact at spring fatigue test, the test fatigue life of spring of steel 60Si2CrVAT is up to ≥3 000 000 times.关键词：60Si2CrVAT钢;铁路货车用弹簧;疲劳断裂;点接触;应力集中;下贝氏体2|0|0更新时间：2026-01-21
- 摘要：The σ-phase precipitation rule in four kinds of typical ultra-low-carbon dual phase stainless steel 00Cr21Ni2Mn5N, 00Cr22Ni5Mo3N, 00Cr25Ni7Mo3N and 00Cr27Ni7Mo5N solid-solution-treaded at 1 050 ~ 1 120 °C and aged at 500 ~ 1 100 °C and the effect of σ-phase content on pitting corrosion potential of four kinds of ultra-low-carbon dual phase stainless steel are analyzed and studied by Thermo-Calc thermodynamic calculation, metallurgraphy and electrochemical method. Results show that with increasing ageing temperature the a-phase precipitation amount increases at earlier and decreases later, and with chromium-molybdenum content (/% ) in ultra-low-carbon dual phase stainless steel increasing progressively in order of 20. 98-0. 03, 22. 41-3. 16, 25. 30-3. 46 and 26. 69-4 74, the peak amount of σ- phase precipitation increases progressively in order of 4. 9% , 22. 5% , 27. 0% and 40. 5% , while the σ-phase complete dissolution temperature increases in order of 660 °C , 950°C, 1 060 °C and 1 100 °C ； the more amount of σ- phase precipitation, the lower the pitting corrosion resistance of ultra-low-carbon dual phase stainless steel, and the corresponding Eb100value to σ- phase precipitation peak of four kinds of steel is in order of -94. 0 mV, 100. 1 mV, 260. 2 mV and 117. 7 mV.关键词：超低碳双相不锈钢;Cr;Mo;σ-相;析出行为;点蚀电位2|0|0更新时间：2026-01-21
- 摘要：The precipitated phases in Ф47 mm x 8 mm cold rolled tube of heat resistant steel TP310HCbN (/% : 0. 07C, 0. 39Si, 1. 20Mn, 25. 05Cr, 20.40Ni, 0.42Nb, 0.266N) solid-solution-treated at 1 120 ~ 1 160 °C then rupture test at 700 °C for 0 ~19 570 h are analyzed by the test method including SEM, TEM, energy spectrum analysis and hardness test. Results show that as the heat resistant steel TP310HCbN rupture test with 95 ~220 MPa at 700 °C for 0 ~ 1 000 h, with increasing test time, the hardness HV value increases from 237 to 255 , as that for more than 1 000 h, the hardness value is no change； with increasing test time, the intragranular precipitates in steel change from granular type to rod type, and there is a lot of wormlike NbCrN precipitates which interacts with dislocation ； the extrapolated rupture strength of produced test heat resistant steel TP310HCbN at 700 ℃ for 100 000 h is 63. 65 MPa to meet the requirement of standard.关键词：TP310HCbN耐热钢;Ф47 mmx8 mm管;析出相;持久强度2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet for low alloy high Strength steel Q345E (/% ： 0. 12 ~ 0. 15C, 0. 20 ~ 0. 25Si, 1. 40 ~ 1. 50Mn， ≤0. 010P, ≤0. 005S) is 80 t top and bottom combined blown converter- LF- RH- Φ450 mm bloom CC-Φ110 mm bar continuous rolling process. The effect of reduction ratio ( 10. 33 ~ 20. 25) , beginning rolling temperature (1 120 ~ 1 080 ℃ ) and cooling mode (0. 2 ℃/s air cooling and 0. 5 ℃/s wind cooling) on V-notch impact energy of steel at -40 ℃ has been commercial-tested. Results show that with increasing reduction ratio, decreasing beginning rolling temperature and increasing cooling speed the impact energy of steel at -40 ℃ obviously increases; and with using reduction ratio 16. 74, beginning rolling at 1 100 °C and 0. 5 °C/s wind cooling process, the steel Q345E has fine and homogeneous structure and its impact energy at -40 ℃ is 40 J.关键词：风电法兰用钢Q345E;控冷控轧工艺;组织;低温冲击功2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet for test 250 mm x 250 mm square bloom of EA4T steel for axle (/% : 0. 23C, 0. 32Si, 0. 70Mn, 0. 014P, 0. 010S, 0. 18Mo, 0. 03V) is 60 t EBT EAF- LF- VD- 8. 4 t ingot casting- rolling- annealing process. The effect of 880 - 920 °C oil quenching and 600 - 650 °C tempering, process on structure and mechanical properties of the steel is tested and studied. With 920 °C +600 °C , 920 °C +650 °C and 880 °C +640 °C quenching-tempering treatment, the structure of steel is respectively martensite, sorbite + martensite and martensite + bainite； the mechanical properties of steel EA4T treated by 880 °C +640 °C quenching-tempering process are Rp0.2-525 MPa, Rm-720 MPa, .A5-23% , U-5 mm longitudinal impact energy- 68 - 82 J and cross-sectional impact energy- 65 - 86 J, and its structure and mechanical properties all meet the requirement of standard EN13261.关键词：250 mm x 250 mm方坯;EA4T车轴用钢;淬-回火处理;组织;力学性能2|0|0更新时间：2026-01-21
- Technical support is provided by Beijing Founder electronics co., LTD 鄂ICP备2022000839号
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
- Total Visits：35684
0