最新刊期
卷 44 ， 期 4 ， 2023
- 摘要：By establishing three-dimensional physical and mathematical model of gas-liquid flow in 180 t RH including vacuum chamber， immersion tube and ladle ， using VOF two-phase flow model and FLUENT software numerical simulation ， the influence of side-blown argon nozzle arrangement and gas flow rate on gas-liquid two-phase circulation flow in RH is studied. The effects of jet flow rate and upper and lower spacing on the void fraction of the outlet section of the riser， the outlet velocity of the riser and the downcomer and the circulating flow rate are analyzed as the jet holes arranging in a single layer and in a double-layer staggered arrangement. The results show that argon rises along the wall in the upward tube and carries the molten steel upward. The gas content in the cross section of the tube increases gradually along the direction of movement， and the gas content reaches the maximum at the outlet section. The smaller the void fraction of the outlet section of the riser is， the larger the central velocity of the outlet section of the riser and the outlet section of the downcomer is， the larger the circulating flow is， and the shorter the mixing time is. The double-layer arrangement of the jet pipe， reducing the spacing and increasing the blowing volume are beneficial to the improvement of the circulating flow rate and the shortening of the mixing time.关键词：RH Vacuum Refining;Nozzle Layout;Air Blowing Volume;Circulating Flow Rate2|0|0更新时间：2026-01-21
- 摘要：Super austenitic stainless steel （SASS） has been developed widely for industries like marine， environmental protection， chemical industry and other harsh conditions. Due to the higher degree of alloying， the solidification segregation is more serious during solidication process ， and the precipitation phases is many and complex. In this paper， the microstructure composition and evolution law of precipitated phase of super austenitic stainless steel S31254 during solidification were analyzed with thermodynamic calculation software Thermo-Calc， as well as the function of major alloying elements Mo、Cr、Ni、N during solidification and their influence on microstructure evolution， the effect of Mo-Cr element interaction on the evolution of coagulation phase organization. The results indicate that the liquidus and solidus phase line temperatures of this steel grade is 1 394.4 ℃ and 1 358.6 ℃ respectively. The equilibrium solidification path is L → γ ， and non-equilibrium solidification path is L → L1+γ→L2+γ+δ→γ+δ+σ. Mo segregation is the main cause of the σ precipitation， and the content of Mo in the liquid phase of δ and σ phases precipitation is 8.5 % and 11.3 % respectively.关键词：Super Austenitic Stainless Steel;Thermodynamic Calculation;Solidification Segregation;Precipitated Phase4|0|0更新时间：2026-01-21
- 摘要：In order to improve the problems of low oxygen supply intensity and long smelting cycle of 210 t large converter in a domestic steel plant， the parameters of the currently used six-hole oxygen lance nozzle were optimized and the jet dynamics characteristics were defined by numerical simulation. The results showed that： When the lance position was less than 1.5 m， the change of axial velocity did not change significantly with the Angle. When the lance position was more than 1.5 m， the decrease of axial velocity increased with the increase of the nozzle Angle. The coalescence behavior of jet was obviously improved with the increase of dip Angle. The effective kinetic energy of the jet decreased rapidly with the flow of the jet， when the lance position was 1.5 m， it only accounted for about 20% of the initial kinetic energy， and then the kinetic energy attenuation slowed down， and the kinetic energy loss was only about 5% when it reached 2.7 m. The optimized design parameters of the six-hole oxygen lance of 210 t converter are as follows： inclination Angle 15.5°， Mach number 2.06， throat diameter 45.89 mm， outlet diameter 61.14 mm. The industrial test results show that the optimized oxygen lance can reduce the oxygen blowing time by 43 s and increase the dephosphorization rate by 11.4%.关键词：210 t Converter;Six-hole Oxygen Lance;Jet Flow;Numerical Simulation;Industrial Applications2|0|0更新时间：2026-01-21
- 摘要：The new type of water-cooled mold casting ingot mold system consists of an adjustable ingot mold， a water-cooled copper bottom plate， an insulation cap， and a control system. The size of the water-cooled mold casting is inversely calculated from the size of the material used to produce a thick plate with laminar tear resistance， and a 4-factor 5-level orthogonal test simulation is conducted by using Anycasting software， to determine the optimal ingot mold size under the current water cooling control system （wide surface taper 0.75%， narrow surface taper 0.45%， narrow surface arc radius 1 500 mm， insulation cap height 500 mm） and follow up the cooling process 2 to 8 h after casting. Use the method of adding a separator to the center of the water cooling mold casting to divide the ingot into two parts to achieve one mold double ingots， similar to the directional solidification method， to make the center segregation and loose defects exist on the surface of the billet， making it easier to clean and improve the quality of the billet， And it can make the penetration effect more effective during the rolling process， so as to achieve the purpose of producing laminated tear resistant extra thick plates.200-400 mm plate produced by the said method， internal quality meets the standard JB / T 4730.5-2005 class I and plate with layered tear resistance Z35 performance.关键词：New Type of Water-cooled Mold Casting;Extra Thick Plate;Layered Tear Resistance;Z-direction2|0|0更新时间：2026-01-21
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Thermodynamic Simulation of Solidification and Precipitation of Cast Duplex Stainless Steel CD3MWCuN
摘要：The phase transition during equilibrium solidification and cooling process，non-equilibrium solidification segregation and the raw of phase transition of cast duplex stainless steel CD3MWCuN are investigated by FactSage 8.2 thermodynamic calculation software. The calculation results indicates that the phase transition path of equilibrium solidification and cooling are asfollows Liquid→Liquid+δ-Ferrite→Liquid+δ-Ferrite+Austenite→Liquid+δ-Ferrite+Austenite+Nitrogen→δ-Ferrite+Austenite+Nitrogen→δ-Ferrite+Austenite→δ-Ferrite+Austenite+Cr2N→δ-Ferrite+Austenite+Cr2N+M23C6→δ-Ferrite+Austenite+Cr2N+M23C6+Sigma→Austenite+Cr2N+M23C6+Sigma→Austenite+Cr2N+M23C6+Sigma+Laves→Austenite+Cr2N+M23C6+Sigma+Laves+ε-Cu→Austenite+Cr2N+M23C6+Sigma+Laves+ε-Cu+α-Ferrite→Austenite+Cr2N+M23C6+Sigma+Laves+ε-Cu+α-Ferrite+Pi→Austenite+M23C6+Sigma+Laves+ε-Cu+α-Ferrite+Pi.The intermetallic phases precipitated during the equilibrium transition are Sigma phase and Laves phase，in which the Sigma phase is rich in Cr and Mo， but poor in Ni and W without N， while the Laves phase is rich in Cr、Mo and W， and poor in Ni and Cu. The non-equilibrium solidification phase transition path based on the Scheil-Gulliver cooling model are as follows：Liquid → Liquid+δ-Ferrite → Liquid+δ-Ferrite+Austenite → Liquid+δ-Ferrite+Austenite+Cr2N → Liquid+δ-Ferrite+Austenite+Cr2N+M23C6→Liquid+Austenite+Cr2N+M23C6+Sigma→Liquid+M6C+Sigma.The main precipitated phase is Cr2N during the non-equilibrium solidification process ，the alloy element Fe is negative segregation， Cr、Ni、Mo、W、Cu、N and C are positive segregation，among which the elements Cr、Mo and W are very serious in the residual liquid phase at the end of solidification.关键词：Cast Duplex Stainless Steel CD3MWCuN;Thermodynamic Calculation;Solidification and Phase Transition;Segregation;Precipitated Phase3|0|0更新时间：2026-01-21 - 摘要：In order to control the serious loss of Ti element during electroslag remelting of NiCrMoV alloy steel， the effect law of different slag systems on the chemical composition of ESR ingot， the number， composition， and size distribution of inclusions in electroslag ingots were investigated through laboratory experiments and thermodynamic calculation. The results showed that the content of total oxygen in ESR ingots obviously increased after electroslag remelting and it was increased from 15.1×10-6 in consumable electrode to （31.3-42.1）×10-6 in ESR ingots. The number density of inclusions was increased to 6.54-15.95 PCS/mm2. However， the content of nitrogen was almost unchanged. When the slag systems 70%CaF2-30%Al2O3 and 55%CaF2-25%Al2O3-17%CaO-3%MgO were adopted， the Ti loss in ESR ingots became serious and the inclusions were mainly Al2O3. Furthermore， the Ti loss in ESR ingots could be controlled when a certain amount of TiO2 was added to the slag. The types of inclusions were mainly composed of Al2O3， Al2O3-CaO-TiO2， and other oxides. The content of TiO2 in inclusions was obviously increased. Besides， the mechanism of stabilizing Ti content in ESR ingots by adding TiO2 to the slag was revealed through thermodynamic calculation. Based on the cleanliness of ESR ingots after electroslag remelting， the composition of the appropriate slag system （50%CaF2-25%Al2O3-17%CaO-3%MgO-5%TiO2） was determined.关键词：NiCrMoV Alloy Steel;Electroslag Remelting （ESR）;Slag System;Cleanliness;Thermodynamic Calculation2|0|0更新时间：2026-01-21
- 摘要：The effects of deoxidation of SiCa （71%Si-28%Ca） and SiCaBa （52%Si-14%Ca-14%Ba-1.82%Al） alloys on the inclusions denaturation and total oxygen content of 304N stainless steel were studied experimentally. With the addition of SiCa or SiCaBa alloy， the MnO in the inclusions disappeared and was modified to CaO-Al2O3-SiO2-MgO-（BaO） system， and the plasticity of the inclusions was enhanced. The number density of inclusions decreased from 350 to 170 number/mm2， the size increased from 0.8 to 2.7 μm， and the area percentage was 0.05% for SiCa treatment comparing to no deoxidizer treatment， but the total oxygen content did not decrease significantly. After SiCaBa alloy treatment， the melting point of the inclusion was further reduced， and the plasticity was further enhanced. The number density of inclusions was reduced to 155 number/mm2 and the size was increased to 3 μm with an area ratio of 0.049%. And the total oxygen content was further reduced from 111×10-6 to 36×10-6. Moreover， SiCaBa alloy was added at 15 min after the addition of refined slag， compared with the test results after 30 min， the results showed that the number density of inclusions further decreased to 70number/mm2， the diameter decreased to 3.4 μm， with the least number of inclusions and optimal denaturation among several deoxidtation treatments . The total oxygen content was reduced to a minimum of 73% of the original steel sample， resulting in the highest cleanliness of 304N stainless steel after smelting.关键词：SiCa Alloy;SiCaBa alloy;304N Stainless Steel;Inclusions4|0|0更新时间：2026-01-21
- 摘要：In order to improve the problem of nozzle clogging and poor continuous castability of 55Cr3 spring steel with aluminum deoxidation during continuous casting， the evolution of inclusions precipitation in different adding value of calcium lines are discussed and industrial test are carried out. The experimental results show that the light calcium treatment of 55Cr3 steel by reducing the length of the calcium line from 100 m to 50 m， to control the calcium content of the molten steel to about 0.001 7% and the oxygen content to about 0.002 6%， on the overall， the melting point of the average composition of inclusions at 1 600 ℃ is close to the liquid phase line， the area density of CaS inclusions is less than 0.7 pcs·mm-2， the problem of nozzle clogging has been improved， the average number of successive pouring heats has been increased from 5-6 to 8-10 heats， and the qualified rate of inclusions grading result is above 98 %， and the light calcium treatment technology has achieved better results.关键词：Calcium Treatment;55Cr3 Spring Steel;Thermodynamic Calculations;Industrial Tests;Inclusions;Number of Continuous Casting Heats3|0|0更新时间：2026-01-21
- 摘要：Through the laboratory water mold experiment, the best way to add desulfurizer is spray suction type，during production process by measures like adjusting the Angle of the desulphurization spray gun to be close to 90°, the relative height of the spray gun to be 500 mm, the injection point of the desulphurization agent to be within 1/2 radius, the particle size of the desulphurization agent to be no more than 2 mm, the injection speed to be 130-150 kg/min, the powder/gas ratio to be 75 kg/Nm3, and the high-speed stirring time to be 4-6 minutes, etc,it solves the problems of low desulfurization efficiency caused by pipe clogging, splashing and unstable desulfurization yield in the actual production process, and gives full play to the advantages of desulfurization by spraying. Compared with the batch adding (gravity)method, the saving desulfurizer can reach about 25%.关键词：KR Desulfurization;Desulfurization by Powder Spraying;Cost Decreasing and Efficiency Increasing2|0|0更新时间：2026-01-21
- 摘要：In order to explore the problems and improvement methods of the current production process of 37Mn5 steel for oil casing smelting in a steel mill， in this paper the whole process sampling analysis of two consecutive heats in the industrial production of the steel plant， including metallographic specimen， oxygen and nitrogen rod and refined slag sample， was conducted. After optimization and improvement， the final conclusions are as follows：（1）secondary oxidation occurs in different degrees in the LF refining and VD calcium treatment stage， specially feeding calcium line stage reaction is more violent ， which is easy to cause the secondary oxidation of the liquid steel and increasing of Ds inclusions. By optimizing the refining deoxyoperation， the amount of calcium line feeding is reduced from 1.4-1.7 m/t to 0.95 m/t， and all kinds of inclusions are grade ≤1.5， and the qualified rate is 100%；（2） the composition analysis of refining slag shows that the residue components in the ternary phase diagram are all outside the liquid phase region， which results in poor melting performance and poor liquidity of the refining slag. By increasing SiO2 in the slag from to 9%-12%， Al2O3 to 25%-30%， and controlling the binary alkalinity at 5-8， it can improve the melting and fluidity of the slag， strengthen the coverage capacity of the slag， and effectively prevent secondary oxidation；（3） compared to the VD stage， the oxygen and nitrogen content in the tundish casting stage is basically stable， but the number of inclusions has been increased to a certain extent， and the growth rate of the inclusions is far higher than the endogenous rate of the inclusion， therefore， the source is from slag rolling， the smooth casting of the tundish shall be kept， at the same time to avoid the occurrence of dropping off slag phenomenon of the ladle.关键词：37Mn5 Steel;Whole Process Analysis;Petroleum Casing Steel;Process Optimization;Slag System Optimization2|1|0更新时间：2026-01-21
- 摘要：In order to study the LF refining slag system suitable for high cleanliness and high carbon steel， the influence of refining slag alkalinity （R），（CaO）/（Al2O3） on the melting point of the refined slag was calculated by FactSage thermodynamic software， and the most suitable refining slag composition was obtained. According to the thermodynamically calculated refining slag composition， the calcium-aluminum ratio of the original slag system was reduced， and the optimized slag composition was used for the 65Mn steel industrial test. The results show that the optimized refining slag components mass fraction are CaO 52%-58%， Al2O3 28%-33%， SiO2 8%-12%， MgO 5%-7%， R=4-6， （CaO）/（Al2O3）=1.5-2. Using this slag system for industrial tests， T.［O］ can reach 7×10-6-13×10-6 after LF process T.［O］ can reach 6×10-6-12×10-6 after RH process. The mass fraction of dissolved oxygen in the basically controllable steel is within 10×10-6， The Class B thin inclusion grades in the 65Mn steel coil are not more than 1 grade， which meets the requirement of high quality steel.关键词：65Mn Steel;LF;Refining Slag;Total Oxygen;Thermodynamic Calculation2|2|0更新时间：2026-01-21
- 摘要：Aiming at the sags and longitudinal cracks of 15CrMoG rectangular billet， the melting temperature， alkalinity， viscosity and other technical parameters of protective slag were designed. By adjusting the alkalinity of the protective slag from 0.85 to 1.15， the melting point from 1 132 ℃ to 1 200 ℃， and the viscosity from 0.67 Pa·s to 1.4 Pa·s， the crystallization rate of the protective slag was increased， the thickness of solid-state slag film was increased， the thermal resistance was improved， and the heat transfer was uniformly stabilized. At the same time， the melting rate of the slag was optimized from 70 s to 32 s， vibration parameters were controlled， non-sinusoidal vibration bias slope was increased， slag consumption was increased， and lubrication was improved. The surface sags and longitudinal cracks of the billet were eliminated by optimizing the physicochemical parameters and vibration parameters of the slag. The proportion of defective casting billet finishing treatment was greatly reduced， which reduced the grinding work of casting billet and improved the metal recovery rate.关键词：15CrMoG Steel;Sags;Longitudinal Cracks;Protective Slag2|0|0更新时间：2026-01-21
- 摘要：With the gradual improvement of the system science system， the iron and steel production mode has undergone a transformation from the empirical mode to the scientific production mode due to scientific innovation and development， the iron and steel industry with the characteristics of the process system can apply the system engineering approach to think and analyze as a whole， with the technical means of systems science to abstract the complex electric arc furnace steelmaking process description， the complex involving multiple states of matter and energy states of the electric arc furnace The abstraction of the steelmaking process into a unit system with material and energy transformation as constraints， a comprehensive understanding of the energy and material transformation process in the electric arc furnace steelmaking production， the constraints additional process timing factors， you can establish a process model for the simulation of the production process， for the actual working conditions of the electric arc furnace smelting process system analysis and abstraction， to be able to establish a process control model with process operation as the control factor， for the actual production of furnace charge It can analyze the key process factors affecting the technical and economic indexes， solve the problem of "synchronization" of target temperature and carbon content， and achieve the production effect of shortening the smelting cycle of single furnace by 2 minutes.关键词：Electric Arc Furnace Steelmaking;Systems Engineering;Process Optimization2|0|0更新时间：2026-01-21
Smelting and Solidification
- 摘要：With the development of high-speed trains， the requirements for performance of trains are getting higher and higher， especially the performance of brake discs in braking systems.This paper studied the forged steel brake disc material， the comparative tests of different quenching and tempering temperatures were performed；The results show that quenching temperature increase resulted in the strength rising， which could reach more than 1 100 MPa， on the contrary， the impact energy values show a downward trend. With consideration of the matching degree of strength and toughness， 890-920 °C is selected as the appropriate quenching temperature range. At 650℃， the strength and toughness match is better， and the tensile strength and yield strength can reach 1 274，1 204 MPa， and the impact power is up to 43 J. Considering comprehensively， it is recommended to choose the intermediate temperature of 650 ℃ as the appropriate tempering temperature.关键词：High-Speed Trains;Brake Disc;Quenching Temperature;Tempering Temperature2|0|0更新时间：2026-01-21
- 摘要：The effect of quenching cooling method on the mechanical properties of 20Cr1Mo1VTiB steel bar after overall heat treatment was studied through microstructure test methods such as mechanical property test， scanning electron microscope （SEM）， transmission electron microscope （TEM）， and electron backscattered diffraction （EBSD） . The results show that when quenching water cooling after austenitizing treatment 1 h at 1 040 °C， good strength and low-temperature impact toughness can be obtained. When quenching water cooling， the strength does not change much， but the low-temperature toughness decreases sharply. When the quenching cooling rate continues to decrease， the low temperature impact toughness performance continues to deteriorate. After austenitizing treatment， the cooling method changes from water cooling→ oil cooling→ air cooling → furnace cooling， the transformation process of the matrix structure is slatted bainite→ granular bainite + slatted bainite→ granular bainite →α ferrite. When tempering at 700°C， the precipitated phase of the slatted bainite is finely dispersed， and M3C carbides with a certain orientation and continuous distribution are precipitated from the granular bainite M/A island. The slower the quenching cooling rate， the larger the M3C phase size and the higher the degree of aggregation along the edge of the M/A island. The deterioration of impact toughness performance caused by the decrease of quenching cooling rate from water cooling to oil cooling is mainly caused by three factors， which are the widening of bainite slats， the decrease of the proportion of grain boundaries at large angles， and the continuous distribution of M3C carbides in the M/A fraction of the granular bainite tissue. The continuous distribution of M3C carbides providing a low-energy channel for crack growth is the main reason for the rapid decline of low-temperature impact toughness.关键词：High Temperature Bolting Steel;Quenching Cooling Method;Low-temperature Impact Toughness;Granular Bainite;M3C Carbides3|2|0更新时间：2026-01-21
- 摘要：In the carburizing process of gear steel， AlN is often used to control the growth of austenite grains. however， the large amount of AlN precipitation will deteriorate its thermoplasticity and crack sensitivity， and AlN remelts during high temperature carburizing at 1 050 ℃， the pinning effect is weakened . By designing steel grades at different AlN concentration product （［%Al］［%N］） and Zr microalloying， to study the effect of AlN and Zr microalloying on the growing behavior of thermoplastic and carburization grains of 20 Cr gear steel. The results show that： for 20Cr series gear steel， increasing the AlN concentration product will deteriorate the hot ductility and make the plastic trough （750-900 ℃） to move to the high temperature zone. However， the low AlN concentration product or Ostwald ripening phenomenon during carburizing process will weaken the grain boundary pinning effect of AlN. Therefore， it is more appropriate to control ［%Al］［%N］ in steel at the lower limit between 2.9×10-4-5.1×10-4. In addition， the Zr in gear steel will preferentially precipitate coarse ZrN during the solidification process， resulting in a decrease in the amount of AlN precipitation and weakening the effect of pinning grain boundaries. Therefore， it is necessary to control the content of N elements to avoid the influence of coarse high temperature precipitation phase on AlN.关键词：Gear steel;AlN;Hot Ductility;Grain Size;Zr Microalloying3|1|0更新时间：2026-01-21
- 摘要：Microstructure and properties of Φ457 mm×70 mm 12Cr1MoVG steel pipe （/% ： 0.13C， 0.21Si， 0.56Mn， 1.07Cr， 0.31Mo， 0.20V， 0.008P， 0.004S， 0.02Ni， 0.004Cu， 0.012 4Al） after 1 000 ℃ normalizing plus using water mist accelerated cooling and 740 ℃ tempering were studied by means of microstructure observation， tensile test ， impact test at room temperature， hardness test and high temperature durability test. The results showed that the microstructure consisted of ferrite and bainite， with the volume of bainite accounting for 65%， and the grain size of 7-5 grade. Yield strength was 416 MPa， tensile strength was 575 MPa， impact energy at room temperature was 206-244 J， brinell hardness was 187HBW. The endurance strength under 575 ℃×105 h was 86 MPa. It lasted 51 480 hours at 575 ℃/100 MPa unbroken. After 27 198 hours， it cracked under 575 ℃/120 MPa， and the crack originated from grain boundary creep pores， no serious spheroidization was found in the bainite matrix surrounding. The structure stability was excellent.关键词：12Cr1MoVG Steel Pipe with Thick-wall;Microstructure and Properties Control;Bainite;High Temperature Endurance Strength6|0|0更新时间：2026-01-21
- 摘要：The deformation resistance test of a new type of longitudinal variable section weather-resistant bridge steel with different Nb content was carried out by Gleeble 3800 thermal simulation tester. The deformation stress curves of the steel were measured at different deformation parameters， such as deformation rate of 1， 5， 10 s-1， deformation temperature of 750-1 000 ℃ and deformation amount of 50%. The microstructure changes of the test steel under different thermal deformation parameters were studied by means of metallographic microscope， scanning electron microscope and transmission electron microscope. According to the test results， the influence principle and main reason of deformation parameters and Nb content on the deformation resistance and microstructure of longitudinal variable section were analyzed. The results show that when the content of Nb ≥0.03%， the deformation resistance of steel plate increases significantly， and the microstructure is obviously refined. The addition of certain Nb element can increase the recrystallization temperature of steel plate above 50 ℃， so that LP weather-resistant bridge steel can be rolled in the high temperature range of deformation temperature between 850 ℃ and 950 ℃， so as to better guarantee the profile and comprehensive properties of LP steel plate. It provides a theoretical basis for the trial production of LP steel plate.关键词：Weather-resistant Bridge Steel;Longitudinal Variable Cross-section;Nb Content;Deformation Parameter;Deformation Resistance;Microstructure3|0|0更新时间：2026-01-21
- 摘要：In view of the brittleness and difficulty in rolling of 6.5% Si high silicon steel at room temperature， ordinary silicon steel hot rolled plate （≤3%Si） is used to cover the high silicon steel （6%-8%Si） billet， and produce 0.3 mm thickness high silicon steel strip by hot rolling， warm rolling and high temperature annealing. It is found that the hot-rolled high silicon steel by pack rolling has a brittle-ductile transition in the range of room temperature and 280 ℃， the elongation increases significantly at 280 ℃， and the fracture morphology exhibits a large number of toughness nests， manifested as plastic fracture. According to the real-time monitoring of the process parameters， it can be seen that the average rolling force of the pack-hot-rolled 6.5% high silicon steel during warm rolling at 550-600 ℃ is related to the plate thickness， roller gap， material hardening degree， rolling temperature and other factors. The reduction rate first increases and then decreases with the thickness reduction. The reason for the reduction is related to the saturation of rolling load and the proximity of rolling thickness to the target thickness. The ratio of the cladding layer to the core layer of the warm-rolled-finished plate is 1/5. Warm rolled plate with a thickness of 0.3 mm was annealed at high temperature， and the high-frequency iron loss P0.2/10k of finished plate is 78.8 W/kg， presenting excellent magnetic properties， which is significantly lower than that of the ordinary silicon steel with 3% Si.关键词：6.5%Si High Silicon Steel;Pack Rolling;Mechanical Properties;Magnetic Properties2|0|0更新时间：2026-01-21
- 摘要：The dynamic high temperature ductility test shows that 16MnCr5 steel does not appear brittleness in the second brittle zone （900-1 200 ℃）， and the optimum deformation temperature is 800-1 050 ℃. The plasticity decreases between 600 and 750 ℃， corresponding to the third brittle zone.The continuous cooling transformation experiment shows that when 16MnCr5 steel is cooled at speed between 0.5-3 ℃/s， uniform ferrite and pearlite structure can be obtained； When the cooling speed is more than 5 ℃/s， bainite appears. The structure transformation of 16MnCr5 steel continuous casting billet cooled to 600 ℃ has just been completed or has not yet been completed， therefore the temperature of hot charging should be lower than 600 ℃ as far as possible. After 16MnCr5 wire rod is rolled， close the insulation cover for slow cooling， which is conducive to subsequent processing.After rolling 16 MnCr5 steel wire rods， the insulation cover is closed for slow cooling， which is used in the production of Φ30 mm large size 16 MnCr5 steel wire rod. The microstructure is F + P with grain size about 7.5， hardness about 80HRB， and uniform microstructure， which can meet the requirements of downstream customers for drawing and cold heading.关键词：16MnCr5 Steel;High Temperature Thermoplasticity;CCT;Hot Charging3|0|0更新时间：2026-01-21
Forming and Phase Transition
- 摘要：In view of the special working conditions of 350 ℃ high temperature， 17 MPa high pressure and multiple cycles of steam huff and puff in thermal production wells， the mechanical properties of TP110H during the first steam injection and multiple cycles of injection and production are studied. The test shows that TP110H generates thermal stress up to 764 MPa during thermal injection， and the material generates a small amount of plastic strain and stress relaxation effect. The string stress of 15 rounds of steam huff and puff is basically stable， and the strength and elongation at room temperature are basically unchanged before and after the experiment. The high-temperature yield strength at 350 ℃ decreases by about 50 MPa， the tensile strength decreases by about 13 MPa， and the elongation after fracture decreases by about 2%.关键词：Thermal Production Well;Steam Huff and Puff;Casing Pipe;Stress Relaxation4|0|0更新时间：2026-01-21
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