最新刊期
卷 31 ， 期 5 ， 2010
- 摘要：The solubility of nitrogen in solid stainless steel 304, 304L, 301S and 301L (γ-phase) and in melts of austenite stainless steel has been calculated by using thermodynamic analysis method to get computational model for solubility of nitrogen in the steels, and the experimental research on nitriding behavior in four austenite stainless steels has been carried out by 1 kg MoSi electric resistance furnace with 33-100 kPa at 1520 ~1580 ℃. Results show that the solubility of nitrogen in y- phase in solid austenite stainless steels is highest; in cooling and solidifying process at normal pressure there is a transformation process from liquid phase, δ-phase to γ-phase; the nitrogen content in austenite steel shall decrease if supersaturated nitrogen to 8- phase in melt of stainless steel precipitates as gas bubble, so it is available to melt high nitrogen austenite stainless steel by using quick cooling at normal pressure or pressurized casting.关键词：Austenite Stainless Steel;Nitroge Solubility;Themodynamic Calculation;Nitriding Experiment2|0|0更新时间：2026-01-21
- 摘要：Based on practical production data of steel ZG06Cr13Ni4Mo refining by 40 t VOD at Heavy-Duty Machinery Co, Ansteel, and according to conservation of energy and mass and principle of thermodynamics, a process model for steelmaking stainless steel with VOD has been established by using analysis method of system engineering and analyzing on VOD refining process with four level of operation, chemical reaction, metallurgy and thermo-chemical computation. The process model includes metallurgical model and thermal model, with input of variables including charging amount, ingredient and temperature of each material, the predicted data of output including yield and ingredient of each material can be obtained conveniently. Results of VOD production show that the VOD refining oxygen demand, end analysis and temperature of liquid can be predicted by the process model, its relative error is less than 5%.关键词：VOD;Stainless Steel;Process Model2|0|0更新时间：2026-01-21
- 摘要：The effect of location and number of gas permeable brick and bottom argon supply rate on mixing time of liquid in a 90 t ladle furnace at steelworks has been tested and studied by using water model with 1：2.5 geometric resemble scale. Results show that the optimum ladle furnace gas permeable brick is located under dumping area of high level charging hopper, the slag material and alloy is directed adding at bare area to get higher melting rate and alloy yield； and the mixing time o£ liquid in ladle is shortest with bottom gas blowing rate 23. 89 L/min, it is available to deep desulphurization of liquid steel.关键词：Ladle Furnace;Bottom Blowing Process;Mixing Time;Water Modelling2|0|0更新时间：2026-01-21
- 摘要：The numerical simulation on distribution of temperature field,stress field and displacement field of copper mould wall with 10 mm thickness for casting liquid of 0.2% C steel has been carried out by using finite element analysis software ANSYS/thermal,with comparison to get the safety of serious service part of mould wall at conditions with various heat exchange coefficient. Results show that the peak temperature of mould hot surface is 525 K and the peak temperature of mould cold surface is 475 K; the deformation of outside wall round corner of mould is 0.789 mm it is larger than that of inside wall; the max equivalent stress and max strain occur at inside wall round corner at which liquid contacting air,and are respectively 218 MPa and 0.002079. The temperature,deformation and stress of mould all meet the requirement of concasting safety.关键词：Mould;Finite Element Analysis;Temperature Field;Stress Field2|0|0更新时间：2026-01-21
- 摘要：A computer simulation analysis on heat treatment process (electromagnetic induction heating for 55 s, air cooling for 8 s, wind cooling for 42 s then air cooling to ambient) of heavy rail end of steel U71Mn (% : 0.65 -0.76C, 0.15 ~0.35Si, 1.10~1.40Mn, ≤0.030V, ≤0.025Ti) has been carried out by using finite element method and computer graphics theory to dynamically display the distribution of temperature and structure in rail end at any time. Simulation results show that at the cooling condition the quenched structure of cross section of rail end is fine lamella pearlite (sorbite + troostite) without martensite and bainite structure to meet the experimental results.关键词：Heavy Rail;End Quenching;Temperature Field;Phase Transformation;Computer Simulation2|0|0更新时间：2026-01-21
- 摘要：According to similarity theory, the bubble behavior in single snorkel refining furnace has simulated by u- sing a scale 1 ：4 water model for an 80 t single snorkel refining furnace at steel works, and the effect of gas blowing rate (2~10 L/min) and plug diameter (15~30 mm) on bubble behavior and mixing time is analyzed. Water simulation results show that with increasing gas blowing rate the mixing time decreases, but as gas blowing rate >6 L/min, the mixing time has no obvious change ； at equal gas blowing rate, with increasing plug diameter the mixing time decreases. Based on water model experimental study, the pilot production of ultra-low carbon steel by an 80 t single snorkel refining furnace has been carried out. Results show that within decarburization time for 18 min in single snorkel refining furnace the carbon content in steel may decrease to 10 x 10-6at the condition of using 4 kg/t desulphurizing agent the sulphur content in finished steel is (20 - 30) x 10-6and the average desulphurizing rate is 49% ; the average argon blowing intensity is 4 L/(t • min) of a single snorkel refining furnace, it is 25% that of a RH unit with same capacity关键词：Single Snorkel Refining Furnace;Water Model;Bubble Behavior;Metallurgical Effect2|0|0更新时间：2026-01-21
- 摘要：The representative chemical composition system and properties of steel rails for freight transport and passenger traffic are summarized and analyzed. The key technologies of rails for railway manufacturing flow sheet including melting, continuous casting and hot rolling, and the now progress of the technologies at home and abroad are presented to put emphasis on analysis of characteristics and key technologies for manufacturing rails for railway by using universal mill. The present production status and quality level of domestic rails for railway including development of chemical composition system and manufacturing technologies are analyzed.关键词：Rail;Universal Rolling;Production Equipment;Manufacturing Process2|0|0更新时间：2026-01-21
- 摘要：According to the present status of research and development of high strength non-quenched and tempered cold heading steel at home and abroad, the chemical composition, characteristics of process, structure and mechanical properties of 800 ~ 1200 MPa high strength non-quenched and tempered cold heading steels are analyzed and discussed. The high strength non-quenched and tempered cold heading steel should has high strength and excellent cold-forming property, of which the strength and hardness of hot rolled products should be controlled in a suitable range. The steel grade can get better structure and mechanical properties by using low carbon high manganese and micro-alloying steel series with thermal-mechanical control rolling process.关键词：Non-Quenched and Tempered Cold Heading Steel;Chemical Composition;Structure;Mechanical Properties;Research and Development2|0|0更新时间：2026-01-21
- 摘要：Key words:Bloom of Heavy Rail Steel,Numerical Simulation,End Position of Solidification,Soft Reduction,Center Porosity关键词：Bloom of Heavy Rail Steel;Numerical Simulation;End Position of Solidification;Soft Reduction;Center Porosity5|0|0更新时间：2026-01-21
- 摘要：The N80-1 oil casing pipe steel (36Mn2V, % : 0.34-0.38C, 0.25-0.40Si, 1.45-1.70Mn, ≤ 0.020P, ≤ 0.015S, 0.01 -0.04Al, 0.11-0.16V, (Sn + Sb + As + Pb + Bi) ≤ 0.035, [O] ≤ 35 x 10-6[N] ≤ 80 x 10-6[H] ≤ 2.5 x 10-6is melted by 80t top and bottom combined blown converter-LF-VD-Φ210 ~ 270 mm round bloom casting process. With process measures such as catch carbon and reblow practice, controlling end [C] , controlling rephosphorization W0. 008% at tapping, and using basicity 3.2-4.0 refining slag, the P content in steel is 0.012%-0.019% , S is 0.003%-0.005%, while [O] (11 -22) x 10-6[N] (39 ~76) x 10-6and [H] (1.5-2.1) x 10-6and the analysis, structure and properties of steel are all meeting the requirements of consumer and standard API Spec 5CT.关键词：Converter;N80-1 Oil Case Pipe Steel;Process Practice2|0|0更新时间：2026-01-21
- 摘要：Charged weight for the 70 t arc furnace is 80-81 t including direct reduction iron hot briquette (HBI) 14.6-15.2 t and hot metal 23-27 t, its tapping liquid amount is 77-78 t, electric power consumption 316 ~ 324 kWh/t, oxygen consumption 29.7-33. 0 m3/t and tap-to-tap time 48 ~54 min. Steelmaking practice shows that HBI is a substitute for quality scrap, it is available to improve dephosphorization and de-carbon reaction, decrease oxygen consumption 1.3-3.2 m3/t, but with increasing every 1% charge of HBI the electric power consumption increases 3. 5 kWh/t, therefore it is not suitable charging HBI only with scrap, as charging 30% hot metal and 10% HBI the steelmaking process is optimization.关键词：70 t Arc Furnace;HBI;Electric Power Consumption;Metallurgy Quality2|0|0更新时间：2026-01-21
- 摘要：The bearing steel GCr15 is produced by pretreated hot metal (0.050% P, ≤0.005% S)-150 t BOF catch carbon blowing LF (RH) - 350 mm x 470 mm bloom casting-800 mm bar-rod continuous rolling mill process at Benxi Steel. Operation practice results show that the higher oxidative state of liquid at condition of high lance height is favorable to remove the phosphorus in steel and realize high [C] at tapping, i. e. BOF end [C]- 0.41%-0. 67% and [P]-0. 013%- 0.017% ； the tundish [C] is 0.96%-0.98% , [P] 0. 014%-0.020% and [S] 0.002%-0.005% ； and the chemical composition and metallurgical quality of steel meet the requirement of standard.关键词：150 t BOF;Bearing Steel GCrl5;Catch Carbon Operation3|0|0更新时间：2026-01-21
- 摘要：With decreasing rolling speed, increasing reduction in rough rolling passes especially in last passes, the quality of macrostructure of continuous rolling Φ30 ~45 mm round products of bearing steel GCr15 rolled from 150 mm x 150 mm casting billet increases obviously i. e. occurred ratio of residual shrinkage hole decreases to 0 from 26%〜46% before improvement of rolling process, qualified ratio of ultrasonic detection is 100% , rating of general porosity is 0 ~1 and rating of center porosity is 1-1.5.关键词：Bearing Steel GCr15;Continuous Rolling for Bar Products;Residual Shrinkage Hole;Reduction in Pass;Process Improvement2|0|0更新时间：2026-01-21
- 摘要：The key technology for production of lead free-cutting steel is to control the yield of lead, the homogeneity of lead in liquid, the lead vapour pollution on environment, the surface quality of billet and smooth casting. Both controlling lead and increasing castability of steel SUM24HSL (% : ≤0.11C, 1.0-1.5Mn, ≤0.05Si, 0.04-0.09P, 0.26-0.42S, 0.25-0.32Pb) produced by 100 t EAF-LF-CC process has been studied. Results show that with adding lead 3.5-4.0 kg/1 (size 2-3 mm) at 1620-1640 °C , adding speed 50-60 kg/min, argon blowing rate 420-480 L/min, the yield of lead is 75%. Smooth casting and qualified metallurgical quality are insured by combined mold vibration parameters, suitable mold flux, casting temperature and shield casting technology.关键词：Lead;Free-Cutting Steel SUM24HSL;Billet Continuous Casting7|0|0更新时间：2026-01-21
- 摘要：The production process flow sheet for 198 〜308 mm heavy plate of developed die steel 718 ( % : 0.32〜0.40C, 0.30~0.50Si, 1.00~1.50Mn, ≤0.016P, ≤0.005S, 1.50~2.00Cr, 0.40-0.50Mo, 0.80~1.20Ni, 0.020-0.045Al) is 90 ~ 100 t EAF-LF-VD-40 t ESR (950 mm x 2 000 mm slab) -rolling (control cooling) -heat treatment. Examination results show that the P content in steel is 0.009%~0.012% , the S content is 0.001%~0.003% , and the gases contents are (45~60) x 10-6[N], 1.5 x 10-6[ H] and (13~18) x 10-6[O] ； the average value of HB hardness is 317~352 with structure of tempered bainite + minor tempered sorbite to meet the requirement of workability and surface quality for various dies.关键词：Die Steel 718;Heavy Plate;Production Process;Structure;Hardness3|0|0更新时间：2026-01-21
- 摘要：Based on analyzing the effect of calcium treatment on inclusion modification and combined commercial pilot production of pipeline steel X80 (%： ≤0.08C, ≤1.85Mn, ≤0.060Als) in steelworks, the limits of calcium content required for modifying Al2O3to low-melting-point calcium aluminate and the limits of sulphur content to avoid single phase CaS precipitation are analyzed and calculated by using the metallurgical thermodynamics principle, and after RH treatment of liquid containing ≤0.002% S and 0.025%~0.035% Al and calcium treated by feeding Ca-Si wire according finishing [Ca]Tot= (40 ~50) x 10-6calculation, the examination of inclusions in liquid of tundish and in casting billet has been carried out. Results show that the average [Ca]Totfor test heats of pipeline steel X80 is 41 x 10-6and [S] is 23 x 10-6that are within the limits calculated by theory, and the most inclusions in calcium treated steel are compound inclusion CaO- CaS-Al2O3to get better result of calcium treatment.关键词：Inclusion;Modification;Pipeline Steel;Calcium Treatment2|0|0更新时间：2026-01-21
- 摘要：Development of structure o£ microalloying medium-carbon steel (% : 0.32 -0.38C, 0.001-0.010B, ≤0.05Als) controlling rolling and cooling with deformation at 760-820 ℃. and initial cooling at 750-840 °C has been studied by hot compression test by Gleeble-1500 thermal simulation machine. Results show that the average ferrite grain size decreases with decreasing deformation temperature and increases with increasing initial cooling temperature, and with decreasing deformation temperature the percentage of ferrite increases and the spheroidizing trend of pearlite is more obvious ； the optimum process parameters are deformation temperature-790 ℃ and initial cooling temperature-840 ℃. to get maximum ferrite volume percentage- 64.5% that is far more than that 54% in general medium-carbon steel. The definite BN particles at grain boundary are available to improve the plastic deformation of B steel.关键词：B Microalloying Medium-Carbon Steel;Hot Compression Test;Structure Development2|0|0更新时间：2026-01-21
- 摘要：The effect of austenizing time (30 - 100 s) at 850 °C on structure and mechanical properties of 1 mm sheet of DF78O cold rolled dual phase steel (% ： 0.15C, 1.80Mn, 0.08Ti, 0.04Al) has been studied by using continuous annealing simulation machine. Results show that with conditions of austenizing at 850 X., cooling to 460 °C with 24 Y/s, retention for 12 s then cooling to ambient temperature with 7 Y/s, the martensite content in steel and tensile strength of steel could be controlled by change austenizing time: with decreasing austenizing time the martensite is continuously banded distribution and with prolonging austenizing time the continuity of banded martensite is weakening； as austenizing for 30, 45 and 100 s, the martensite content in the dual phase steel is respectively 13. 7% , 21. 6% and 15. 6% , and the tensile strength of steel is respectively 800, 840 and 805 MPa.关键词：Dual Phase Steel;Austenizing Time;Martensite;Tensile Strength2|0|0更新时间：2026-01-21
- 摘要：The growth behavior of austenite grain of secondary hardening ultra-high strength steel AF1410 (% : 0.165C, 14.10Co, 9.83Ni, 1.92Cr, 1.05Mo) heating at 800 ~ 1200 °C for 5 - 180 min has been studied. Results show that with increasing heating temperature and holding time the average austenite grain size of steel AF1410 increases, and the austenite grains coarsen seriously at temperature more than 1100℃at different heating temperature; the relation between average austenite grain size of steel and holding time corresponds to Beck equation ； the math model for austenite grain growth of steel AF1410 has been established, with heating at 800〜1200 °C the average activation energy for austenite grain growth of the steel is 220.2 kJ/mol, and the relation between its average austenite grain size and heating temperature conforms to Arrhenius-type equation.关键词：Secondary Hardening Ultra-high Strength Steel AF1410;Austenite;Grain growth2|0|0更新时间：2026-01-21
- 摘要：The 0.5-2.5 mm cold rolled sheet of test magnetic pure iron is rolled by 350 mm four high reversing finishing mill from 3.5-4.5 mm hot continuous rolled plate of magnetic pure iron (% ： 0.005C, 0.50 Al). Results show that the optimum annealing temperature for the magnetic pure iron sheet to get smaller coercive force is 850〜900 °C , the heating and cooling speed of annealing has no obvious influence on the coercive force ； with increasing cold-rolling deformation from 28.6% to 88.9% , the coercive force of pure iron sheet annealed at 900 ℃. increases from 29.8 A/m to 73.5 A/m, therefore the optimum cold rolling deformation to get smaller coercive force is ≤45%.关键词：Cold Rolled Magnetic Pure Iron Sheet;Coercive Force;Deformation;Heat Treatment3|0|0更新时间：2026-01-21
- 摘要：The effect of long-term aging at 620 ℃ on structure and mechanical properties of a new ferrite heat resistant steel 1Cr11Co3W3MoVNbNB (%： 0.10C, 11.08Cr, 3.20Co, 2.54W, 0.52Ni, 0.15Mo, 0.09Nb, 0.21N, 0.014B) oil-quenched at 1100 °C + high temperature tempered at 720 ℃. has been studied by using X-ray diffraction method, optical, scanning electron and transmission electron microscope. Results show that with aging at 620 ℃ for 2000 h, the aging time isn't obvious effect on the mechanical properties of the steel at ambient and at 620 °C ; during aging the main precipitated phases are M23C6Nb(CN) and M3B2and the structure of steel is stable and the lath sub-structure has not changed obviously; The elements Mo, W and V in solid solution mainly precipitate into precipitated phase in aging process and the elements Nb and B mainly precipitate in high temperature tempering and in initial period of aging.关键词：Ferrite-Heat-Resistant Steel;Long-Term-Aging;Structure;Mechanical Mroperty2|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