最新刊期
卷 41 ， 期 1 ， 2020
- 摘要：CALPHAD method is used to study and optimize the composition of Ni-based GH3128 alloy and the law of precipitate phase. The results show that the main harmful precipitated phase in GH3128 is phase μ and its principle chemical composition is (NiCr)3( WMo)2. With the increase of W, Mo and Cr content, the precipitated amount of phase μ increases. But addition of 17%Cr induces the transformation of phase μ into phase σ resulting in the decrease of phase μ precipitation decreases. With C content increased, the amount of carbide precipitation increases, not only can also lead to decrease of precitated amount of γ’ phase, but as C content lower than 0.02% , to prompte phase μ precipitated at 700℃ . As the elements of Al and Ti increase, although the amount of γ’ phase precipitation increases, the a phase is also precipitated. Therefore, Through GH3128 Ni-based alloy composition optimization (/% : 0.032C, 20. l0Cr, 8.02W, 7.92Mo, 0.72A1, 0.62Ti,0.30Fe,0.005B,0.06Zr,0.05Ce,0.35Mn,0.43Si) , it can make the alloy at the working temperature above 900℃; without harmful phase and harmful a phase precipitation amount is reduced.关键词：GH3128 合金, CALPHAD;析出相;热力学模拟计算2|0|0更新时间：2026-01-21
- 摘要：The ingredient and phases of solid phase slag without remelting liquid slag air cooling and with liquid-slag reaction remelting slag, air cooling of slag 70% CaF2-25% Al2O3-5% CaO for ESR of electrothermal alloy steel 0Cr21A16NbRE with normal remelting process (A =2800 A,V =30 V) are studied,and the burning loss of RE elements in liquid is analyzed. The results show that without remelting air cooling slag has not RE elements it locates in CaF2-CaO • 2Al2O3-CaO • 6A12O3sub-triangle. The solid phase slag with liquid-slag reaction can be divided into five layers with different colors, difierent phase, the content of CaF2on the top is highest and decreases layer by layer, A12O3increase simultaneously ,RE oxide is found in layers and at the middle and bottom its content is higher, (Ce,La)x( A102) y is major RE oxide phase in slag, which density is high. It is obtained by calculation that slag oxidability is stronger in the middle and bot¬tom of slag,RE element in steel is oxided here. Increasing the Y2O3amount in slag is favourable to increase the RE element Y content in ESR ingot.关键词：电渣重熔, 电热合金, 化学反应, 相;热力学4|0|0更新时间：2026-01-21
- 摘要：The single-pass compression experiment of Q345GJC steel ( /% : 0.16C, 0.36Si, 1.37Mn, 0.026Nb ) is carried out by Gleeble-2000 thermal simulator, the deformation resistances of tested steel with strain rate 0.1 ~ 1 s-1and true strain 0.8 ~ 1.2 at 900 ~ 1150℃; has been measured, and the influences of difierent process parameters on dynamic recrystallization and deformation resistance of tested steel are analyzed. The activation energy of dynamic recrystallization in peak state and steady state determined are respectively 245. 448 kj/mol and 166. 994 kj/mol, and the mathematical model of high temperature deformation resistance of tested steel is established. The model has good curve-fitting performance, its expected values close to the actually measured ones.关键词：高层建筑用钢Q345GJC, 动态再结晶, 变形抗力;热模拟试验;数学模型2|0|0更新时间：2026-01-21
- 摘要：Hot compression tests of DIN 1. 2738 die steel for plastic (/% ：0. 35 ~0. 46C,0, 20 ~ 0.40Si, 1.30 ~ 1.60Mn,L 80 ~2.20Cr,0.90 ~ 1.20Ni,0.15 ~0.23Mo) are carried out by a Gleeble-3800 thermal-mechanical simulator to get stress-strain curves of steel at 850 ~ 1250℃ with strain rate 0. 01 ~30 s-1. Based on the hot deformation data,the peak stresses of steel, the strain-compensated constitutive equation and hot processing maps are established. Suitable hot deformation parameters are also identified by analyzing the processing maps. The results show that the hot deformation activation energy of DIN 1.2738 steel is 354. 21 kj/mol. Adopting the established strain-compensated constitutive equation, the flow curve can be predicted accurately. The suitable hot deformation parameters for DIN 1.2738 steel are： (1) temperature between 950 ℃ and 1150 ℃，strain rate between 0.01 s-1and 0.7 s-1(2) temperature between 1170℃. and 1200 ℃, strain rate between 0. 01 s-1and 1 s-1.关键词：DIN 1.2738塑料模具钢;热变形;本构方程;加工图2|0|0更新时间：2026-01-21
- 摘要：In order to adapt the application requirement for deep well and extradeep well, a combined strength and low temperature impact toughness of TG22 hot rolling steel pipes casing is developed by design of chemical composition and optimization of rolling process. The results indicated that the designed chemical composition is Fe-0. 24% C-0.20% Si-1.30% Mn-0.020% Nb, the target temperature in the heating furnace is 1170 °C and the intermediate slab thickness is 46 mm, the finishing rolling temperature is 830 with coiling at 570℃ , the mechanical properties of strip are Rel 506 ~ 554 MPa、 Rm 654 ~685 MPa.A5029% 〜35%、Rel/Rm 0.75 ~0. 82 and KV2( - 10℃) 45.5 -63.6 J.关键词：Chemical Design, Hot Rolling Process, TG22 Hot Rolled Steel Strip, Mechanical Properties 2|0|0更新时间：2026-01-21
- 摘要：Nitrogen can deteriorate intergranular corrosion, low temperature impact toughness, notch sensitivity and soldering properties of low carbon 400 series stainless steel. Therefore, reducing the nitrogen content under the premise of low consumption and high efficiency has become an important issue in AOD smelting. Combined the production test, by exploring the application of regression analysis in the control of argon-denitrification process and combined with the thermodynamic calculation of denitrification to analyze the production data of AOD, it is determined by the fitting equation that the switching point of nitrogen to argon is at blowing nitrogen 450 m3the normal blowing argon amount of 410S stainless steel in AOD is controlled at 1550m3and the blowing argon amount of low carbon 430 stainless steel in AOD is generally con¬trolled at 2050m3to get controlled [N] below 0.0090% and reduce of argon consumption.关键词：低碳400系不锈钢, AOD;氮氩切换点2|0|0更新时间：2026-01-21
- 摘要：Tempering of the holding time after different temperature of clad steel plate for saw blade steel has been carried out, the hardness of cladding plate and hase plate and the microstructure evolution are measured and observed. The results show that the lath martensite in substrate steel Q345 coarsens gradually during tempering, but the characteristics of lath can be retained after tempering at higher temperatures. However,the acicular martensite in cladding plate steel 45Mn2V degrades faster than that in substrate steel, so the characteristics of acicular could not be observed after tempering at 400℃ ., which results in the decreasing of hardness of cladding plate steel 45Mn2V after tempering is larger than that of substrate steel Q345. Therefore,the tempering temperature of the clad plate should not exceed 400℃. On the other hand,because of the high carbon content, the precipitation of carbides in steel 45Mn2V cladding plate is faster and more during tempering, so high hardness can still be maintained after tempering for 8 hours,while the Q345 substrate plate has obviously softened. Therefore,the optimum performace of steel can be got by oil quenching at 860 ℃ for 5 min and tempering at 360 ~ 390℃ for 6 h.7|0|0更新时间：2026-01-21
- 摘要：The 12 mm steel plate (0.09C,0.28Si, 1.12Mn,0.020P,0.006S,0.58Cr,0.25Ni,0.32Cu,0.045Nb, 0.030Ti) for the bogie frame of high-speed train was successfully developed by hot metal pretreatment -260 t BOF-LF-RH- 170 mm slab casting-rolling process and TMCP (finished rolling at 850℃ fast cooling to 720℃ ,air cooling). It shows excellent low-temperature impact toughness (impact energy at -60℃ 166 ~ 255 J) , and all properties meets the requirements of YB/T 4684-2018. The microstructure consists of a large amount of polygonal ferrite and a small amount of pearlite. The atmospheric corrosion resistance index I is 6.3 ~6.7,and the relative corrosion rate of the steel plate is 54.7% com¬pared with Q345B by 72 h periodic alternate immersion and dry corrosion test. The surface of the rust layer is very dense. The atmospheric corrosion resistance of the steel plate is excellent.关键词：高速列车转向架构架用钢, 低温韧性;周期浸润, 耐大气腐蚀3|1|0更新时间：2026-01-21
- 摘要：The 1215 free cutting steel is successfully developed by 120 t converter-120 t LF-180 mm x 180 mm billet casting high-speed wire rolling flowsheet. The key control point is converter tapping steel C ;0.05% , converter end temperature 1630 ~1660 °C , refining free oxygen control target 50 x 10-6~ 55 X 10-6and binary slag basicity 2.5 ~ 3.0. The composition design is 0.05% 〜0.07% C, 1.20% 〜1.35% Mn, and 0. 340% 〜0. 360% S. On this process conditions ,the morphology and content of sulfide in steel are controlled reasonably. The Mn/S is beneficial to the rolling and improving cutting performance of free cutting steel. The superheat of molten steel is controlled within 25 〜40℃ and the casting speed is 1.2 m/min. It shows that accurately predicting the end-point oxygen content to determine the amount of deoxidizer added, and reasonable control of the oxygen content of different processes are the key to achieve stable quality control of wire products.2|0|0更新时间：2026-01-21
- 摘要：The occurred surface crack of products rolled from 0380 mm high carbon steel ball steel continuous casting round bloom has been statistcally analyzed. The results show that there is a longitudinal crack on the surface of the continuous casting round bloom after shot peening, which is mainly caused by the uneven cooling of the molten steel in the mold. By adjusting the taper of the crystallizer copper tube from 0.45%/m to 0.63%/m,the 1 300 °C viscosity of mold slag is reduced from 0. 60 Pa • s to 0. 50 Pa ・s,and the flux rate of the mold shield slag at 1300 °C is adjusted from 36s to 49s,secondary cooling water ratio decreasing from 0. 30 L/kg to 0.25 L/kg,the four-sided cooling of the second cooling section is changed to eight-sided cooling, the surface longitudinal cracks of the large-size steel ball steel billets and rolled materials are effectively reduced,and the surface inspection qualified rate of the rolled material increases to more than 95%.2|0|0更新时间：2026-01-21
- 摘要：For the problem of nozzle blockage in the production of sulfur-containing steel (0. 10% ~ 0. 21% C, 0. 010% ~0. 050%S) in a steel plant, a comprehensive analysis of the steel samples and nozzle plugging samples of each key process has been carried out by SEM and EDS. The results show that the inclusions with particle size less than 10 fim in each process steel are more than 94% , the number of inclusions per unit area decreases first and then increases with the process flow. The types of inclusions are mainly CaS, CaO-MgO, MnS, MgO-Al2O3Al2O3CaO~Al2O3CaO, CaO- MgO-Al2O3composite inclusions; the nozzle plug is mainly composed of FeO, Al2O3, MgO • A12O3CaO • Al203CaO • 2Al2O3. With blowing a certain amount of coke powder to the molten steel before EAF the tapping ； controlling the refined slag (FeO) ≤l.50% , basicity 2.0 ~4.0 and taking appropriate calcium treatment and staged argon blowing operation； to control the feeding speed of the sulphur wire in the range of 50 ~150 m/min； and cleaning the tundish and using special slag for sulfur-containing steel etc process measures, the nozzle blockage decreases, the sulfide rating is ≤3, the secondary oxidation of liquid reduces, and the casting accident is avoided.2|0|0更新时间：2026-01-21
- 摘要：Ingot mold for forging rolling composite is a kind of ingot mold with. high efficiency, low cost and wide application. Based on the experience of ingot production at factory and the design principle of ingot mold, the parameters such as ingot taper, aspect ratio, cap volume ratio and ingot mold thickness are designed, and a 5. 5 ~7 t ingot mold for forging and rolling composite is developed. The production practice shows that the ingot mold with design parameters of 3. 8% ta¬per, 2. 0 ~ 2. 5 height-width ratio ( adjustable cap opening) , 12. 5% cap-volume ratio, upper thin and lower thick wall thickness (upper 150 mm, lower 175 mm) has obvious effect on improving ingot quality and the forging yield increases from original 83. 0% to 85. 0%.2|0|0更新时间：2026-01-21
- 摘要：Nail-shooting technique is applied to measure shell thickness of 240 mm x 240 mm bloom of steel 35CrMoA ,20CrMoA, GCrl5 and 60Si2MnA produced by the continuous caster. Length of the liquid core and solidification coefficient are calculated by using the solidification law. The electromagnetic stirring position of F-EMS at different drawing speeds is calculated by the solid phase ratio of 0. 70 and 0. 75 for the 240 mm x 240 mm bloom. The relationship between solidification coefficient of continuous casting machine and each process parameter is analyzed. The process optimization measures are： changing the electric stirring position, and modifying the F-EMS position to install according to high carbon steel GCrl5 and 60Si2MnA, and adjusting the casting speed value of four steel of 35CrMoA, 20CrMoA, GCrl5 and 60Si2MnA to 0. 80, 0. 81, 0. 78 and 0. 80 m/min. The quality of billet is improved greatly after the process improvement, i. e. qualified ratio of center segregation rating ≤0.5 increases from original ≤40% to 100% and that of center porosity rating ≤1.5 increases from original ≤50% to ≥90%.关键词：射钉法, 240 mm x 240 mm方坯连铸,&末端电磁搅拌, 综合凝固系数2|0|0更新时间：2026-01-21
- 摘要：The production process of steel 32Cr3MolV round bloom（/%:0.33～0.36C,0.20～0.50Mn,0.20～0.40Si,3.00～3.20Cr,0.30～0.45Ni,1.00～1.20Mo,0.19～0.22V,≤0.008P,≤0.005S,≤0.10Cu,≤0.01 Al）is 110 t EAF-LF-VD-Φ700mm round bloom CC. With control of EAF end [C]≥0.08%、[P]≤0.004%, LF end slag/% : 50~60CaO,10~15SiO215 -25A12O3≤6MgO,ΣFeO+MnO≤0.8% ,after VD [H] ≤1.3 x 10-6bloom whole CC process shield casting,casting speed 0.2 m/min,superheating temperature controlled in 18 〜30℃ ,using M-EMS, S-EMS, F-EMS etc technological measures, the Φ700 mm CC round bloom of 32Ci3Mo1V has been successfully produced. The results show that the surface quality of round bloom is fine with rating of center porosity 1.0, centerline shrinkage ≤1.5 , centerline crack≤ l. 5 ,and center defect size less than 100mm all to meet the requirements of standard.关键词：Steel 32Cr3MolV, Casting Roll Shell Steel,Φ700 mm CC Round Bloom, 110t EAF-LF-VD-CC, Production Practice 4|0|0更新时间：2026-01-21
- 摘要：The effect of finishing rolling temperature (880 〜935℃) on the actual grain size of hot rolled medium carbon boron steel 40B has been studied. With start rolling at 990 〜1010℃ , the different finishing rolling temperatures are achieved by controlling the rolling rhythm of round steel. It is verified that decreasing finishing rolling temperature is beneficial to improve the actual grain sizeΦ32mm hot rolled medium carbon boron steel. Through experimental production and analysis of the longitudinal metallographic structure in the radius 1/2 of the head, middle and tail of round steel, it is found that the actual grain size of hot rolled medium carbon boron steel is the smallest and uniform as the finishing rolling temperature is in the range of 880 〜890℃.4|0|0更新时间：2026-01-21
- 摘要：The cold rolling with 10% ~60% deformation and tensile tests of 3 mm hot rolled plate of saving in nickel high nitrogen austenitic stainless steel Mn17Cr19N0.6 produced by induction furnace-electroslag remelting are carried out. The microstructure changes in the cold deformation process of high nitrogen austenitic stainless steel are studied by metallographic observation and XRD phase analysis. It is concluded that in the process of cold rolling, with the increase of the deformation, the shape of the grain in the test steel is from lump to flat elongate, and the slip from single slip to cross slip, and the twinning band will eventually be cut and broken. The microstructure of the test steels with different cold rolling deformation is single austenite phase, and there is no other phase. There is no martensitic transformation in the cold deformation process. Therefore, no phase transformation strengthening occurred during cold rolling of test steel, and the deformation strengthening is main in the cold rolling process, the tensile strength of the test steel increases from 1045 MPa by 10% deformation to 1880 MPa by 60% deformation. Therefore, special materials with different strength levels and single austenite structure can be prepared by cold deformation.2|0|0更新时间：2026-01-21
- 摘要：The effect of solid-solution temperature 750 - 1050 ℃ on impact property and hardness of 00Nil4Cr3Mo3Ti new maraging steel has been studied, the morphology of impact fracture and microstructure of unaging tested steel are observed by SEM. The results show that as solution temperature of steel is below 900 ℃, with increasing solution temperature the undissolved Laves phase in matrix gradually dissolves and impact properties increase with the increase of solution temperature of imaging and 510℃ 5h aging. As solution temperature is higher than 900 °C , the impact property of solid solution increase with the increase of solution temperature, the impact energy of steel solid-solution treated increases from 215J at 900 ℃. to 226J at 1050℃ . solution treated, but the aging impact property decrease with the increase of solution temperature, the impact energy of steel solution +510℃ 5 h aged decreases from max 62J solution treated at 900℃. to 25J solution treated at 1050℃关键词：马氏体时效钢00Nil4Cr3Mo3Ti,&固溶处理,&时效处理,&冲击性能, Laves相2|0|0更新时间：2026-01-21
- 摘要：Tested typical duplex stainless steel grades S32707 ( 022Cr27Ni7Mo5N)、S32750 ( 022Cr25Ni7Mo4N)、 S32205(022Cr23Ni5Mo3N) and S31803(022Cr22Ni5Mo3N) are sampled from produced billet,and by various heat treatment, hot working and hot piercing process as well as chemical composition adjustment, the effect of microstructure and pro¬duced process on hot working performance has been studied. The results show that the phase ratio and phase precipitation are closely related to the temperature of hot piercing and solution treatment and cold forming annealing, and the precipitation speed and amount of second phase in S32707 far exceed S32750, S32205 and S31803 duplex stainless steel grades. For S32707 duplex stainless grades, lowering Cr(≤27% )and N(≤0.4%) content, increasing Mo (4% ~5%Mo) content ,properly controlling the heating rate(2 ~2.5℃/min) and finishing rolling(forging) temperature(≥1060℃.) and paying attention to the effect of reheating and tube billet drilling could improve hot working ductility and prevent cracking.关键词：特超级双相不锈钢 022Cr27Ni7Mo5N(S32707), 热穿孔, r 相;终轧(锻)温度, 成品固溶处理3|1|0更新时间：2026-01-21
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