最新刊期
卷 39 ， 期 5 ， 2018
- 摘要：The thermo plastic and thermo deformation characteristics of SUP13Cr5Ni2Mo alloy were studied by using Gleeble-3800 thermal simulation test machine, and the hot processing maps were established. The results show that： In the range of 900 ~ 1 300°C, the alloys have good thermoplastic ；The suitable processing of initial in a temperature range between 1 100 ~ 1 200 °C through hot processing map analysis, and the deformation microstructure sample is fine and uniform by using this parameters.2|0|0更新时间：2026-01-21
- 摘要：Based on heat transfer theory, friction analysis theory, and thermal elastoplastic analysis theory, SolidWorks 3D modeling software was used to establish a 60 kg/m heavy rail model. Thermal structural coupling finite element analysis of cooling process after heavy rolling with ANSYS Workbench, reveals the distribution and variation of temperature field, stress field and strain field. The results show that the overall temperature distribution of the heavy rail is the highest in the rail head temperature, followed by the waist temperature, and the lowest temperature at the rail bottom. The cooling process of the heavy rail experience the bent rail base-bent rail head-bent rail base-bent rail head, until the final cooling heavy rail still maintained the trend of turning to the rail head ； overall, stress at both ends of the heavy rail is less than that at the middle section, the rail bottom stress is greater than the rail head stress, and the rail waist stress is the minimum.2|0|0更新时间：2026-01-21
- 摘要：The ingot shape has certain influence on the defects such as porosity and shrinkage in the solidification process of ingot. Based on body height 2 075 mm long and slim shape (B) and 1 885 mm short and thick shape ( A) two kinds of 7 t ingot, by casting simulation analysis of temperature field, solidification fraction, analyses the effect o£ solidification time and center loose shrinkage cavity, 7 t (B) center is 970 mm long and slim ingot ontology high temperature liquid phase, closed area, and the body center loose loose rate more than 20% of the area is about 180 cm37 t (A) short thick steel ingot only had A few minor loose insulation cap, basic no ontology. In this paper, 7 t steel ingots are recommended to be designed with 7 t(A).关键词：7t钢锭;凝固过程;疏松;钢锭设计2|0|0更新时间：2026-01-21
- 摘要：The effect of remaining slag operation (remaining slag fraction 1/3 ~ 2/3 slag amount) of BOF steelmaking steel SCM435 on lime adding amount, remaining slag heats of equilibrium basicity and end slag basicity is tested and studied, and the points for attention in slag remaining operation are summarized. As the 80t BOF remaining slag operation is put into practice, the remaining slag rate is up to 68. 9% , the ratio of P content ≤ 0. 015% in product increases from original 49. 3% to 62. 2% , and the lime consumption decreases by 4. 5 kg/t, and the iron loss in slag decreases by 230 kg.4|0|0更新时间：2026-01-21
- 摘要：Principle and feature of combined blowing process of lime to magnesium for desulfurization of hot metal are briefly introduced, and the effect of ratio of lime to magnesium powder 2. 0 ~ 3. 5 ： 1, 3.5 ~ 5. 0 ： 1 and 5.0 ~ 6.5：1 on end sulfur in metal, resulphurization rate, iron loss and temperature drop in blowing process, desulphurization time and 120 t BOF steelmaking results are commercial-tested. It is obtained that with using the ratio of lime to magnesium powder 3. 5 ~5. 0 ： 1, the resulphurization amount is less than 0.003 5% , the iron loss is less than 26 kg/t, temperature drop is less than 18 ℃ and the yield of steel liquid is more than 87% , so the production cost decreases markedly.2|0|0更新时间：2026-01-21
- 摘要：Xichang company's steelmaking plant adopts duplex steelmaking process which includes vanadiuniextrac- ting and steelmaking. In the process, vanadium extracting reduces the total heat. After vanadium extracting, the product is called semi-steel. Compared with normal hot metal, semi-steel causes lots of steelmaking problems such as heat lack and low quality steel slag, for its low carbon and silicon and manganese and temperature. All of those mentioned limit plant's scrap metal and pig iron consumption. Through exploration and study, the total scrap ration is smoothly raised from 2% ~ 6% to 7% ~ 10%. Meanwhile, the converter refractory brick and steel clearness are safe. The plant's scrap ration takes a leading position in the steelmaking plants using V-Ti hot metal.关键词：钒钛铁水;半钢冶炼;废钢消耗;终点控制3|0|0更新时间：2026-01-21
- 摘要：Because the thickness of flat bloom is thin. In theory, there is no problem of narrow - face bulging. But in real production this happens all the time. Through the research and analysis, it is found that when the spacing between the wide surface clamping roller is too large, A bulge will appear. When the casting billet of the drum is passed through the next pair of wide-face clamping rolls, due to the torsion deformation of the blank shell, it can cause obvious bulge in narrow side. When the high carbon steel is casting, if the secondary cooling ratio is not timely, it is possible to cause the bulging in narrow surface of the flat bloom and produce the middle crack in the triangle area. By analyzing the problems of two steel mills, the corresponding solutions are given, which can serve as a reference for the design and maintenance of similar continuous casting machines.2|0|0更新时间：2026-01-21
- 摘要：The steelmaking flowsheet of gear steel 8620RH ( K) (/% ： 0.18 ~0.22C, 0. 17 ~0. 26Si, 0.70 ~ 0. 90Mn,≤0.025P, 0.015 ~ 0.025S, 0.4 ~0.6Cr, 0.4 ~0.7Ni, 0.15 ~0.25Mo, 0.015 ~ 0.045A1, ≤0.0100N) is 60 t BOF-LF-VD-300 mm x360 mm casting bloom. The BOF end residual elements and tapping amount of steel, alloying adding amount in refining process, adding N method in VD process and carbon segregation of casting bloom in original process have been analyzed, it is obtained that the main causes of hardenability band width AHRC 4 〜5 being on low side in end-quench test are BOF liquid tapping amount not stable, higher superheating temperature extent of liquid in tundish, lower qualified rate of internal controlled compound of liquid and higher casting bloom carbon segregation index. With using the process measures including stabilizing BOF charging and tapping amount, blowing nitrogen to increase nitrogen in liquid in LF, idle hot ladle adding covering plate, controlling tundish liquid supeiheating temperature 15 ~25 ℃., and optimizing casting electromagnetic stirring parameters, the qualified rate of internal-controlled end-quenched hardenability of steel 8620RH(K) increases from original <60% to 82.93%.3|0|0更新时间：2026-01-21
- 摘要：In order to study the desulphurization efficiency during LF refining ship plate and low carbon steels, every affecting factor is studied, the calculation results showed that only the initial sulfur content below 0.027% sulfur quantity in liquid steel could be removed below 0. 01% within 35 min which is LF average processing period； when controlling the slag (FeO + MnO) quantity below 0. 5% , basicity at 4, and MgO at 20% an 12% respectively, desulfurization efficiency is best； sulfur quantity is removed below 0.010% , then controlling dissolved oxygen in steel below 16 x10-6sulfur quantity is removed below 0. 003% , then controlling dissolved oxygen in steel below 5 X 10-6the slag quantity is controlled at 15 〜20 kg/t - steel, controlling the gas flow rate at 0. 6 ~0. 8 m3/min suitably; sulfur quantity decreased fastest in the first 20 mins,it could be controlled below 0. 010% in steel, then it decreased gradually, if sulfur quantity is removed to 0. 005% , refined processing time is more than 30 min usually.3|0|0更新时间：2026-01-21
- 摘要：The reasons for the slug nodulation of 42CrMoA alloy steel (/% ：0.28 〜0.45C,0. 17 〜0.37Si,0.50 ~ 0. 80Mn, ≤ 0.020P,≤ 0.020S,0.90-1.20Cr, 0.15 ~0.25Mo, Cu≤0.20, Ni≤ 0.30, 0.015 ~0.035A1) melted by 120 t BOF and the submerged nozzle were analyzed. The results showed that the main nodule nodules were Al2O3and CaO·2Al2O3aluminates with high melting point. By controlling the end point carbon of converter in 0. 18% to 0. 28% , the dissolved oxygen content of the molten steel in converter is less than 200 x 10-6the parameters of calcium aluminum (0.020% ~0.030% Al； 0.001 5% ~0.003 0% Ca) at the end point of refining, and the casting technology of continuous casting are implemented, the nodulation of 42CrMoA junction steel stopper and the nozzle of the converter is solved.2|0|0更新时间：2026-01-21
- 摘要：Facing the quality problems of low pass rate and crack defects on the surface of the Φ44 mm metal rolling 45 with sulfur(/% ：0.42 ~ 0. 50C,0.17 ~ 0. 37Si,0. 50 ~ 0. 80Mn, ≤ 0.035P,0. 035 ~ 0. 045S) , the analysis is that the defects are caused by defects in the 150 mm x 150 mm casting billet. The crack defects are found on the surface of the slab and analyzed by metallographic microscope. The result indicates that the defect is caused by the strong cooling of the small R of crystallizer copper tube and the poor heat transfer and lubrication effect of the shielding flux and the asymmetrical secondary cooling. The process optimization of the crystallizer copper tube and the shielding flux and the second cooling is carried out. It improves the cooling heat transfer of the mold and the cooling effect of the secondary cooling section and the cooling uniformity of casting billet. The result shows the defects of casting billet have been effective controlled and the qualified rate of rolled material has been greatly improved.关键词：含硫45钢;铸坯;表面裂纹;结晶器铜管;保护渣;二次冷却2|0|0更新时间：2026-01-21
- 摘要：Effect of the non-electromagnetic stirring ( non-EMS) and the EMS with 6 Hz and 50 ~ 200 A in 1 t electroslag remelting (ESR) process on solidification structure o£ alloy GH4169 (/% : 0.04C, 0.21 Si, 0.05Mn, 52. 85Ni, 19. 80Cr, 5.20Nb, 3.05Mo, 0.55Al, 1.02Ti) has been studied. Results show that the EMS may obviously fine grains of alloy, increase ratio of equiaxed crystal and decrease spacing between secondary dentritic arms ； but as stirring electric current intensity is >100 A, the eutectic structure in ESR ingot increases to reduce the plasticity of ingot; as the current intensity is 50 A with frequency 6 Hz, the ratio of equiaxed crystal is max and the spacing between secondary dentritic arms is minimum, the Laves phase content in center of ESR ingot is lowest and the alloy with minor eutectic structure to get excellent plasticity of alloy.关键词：GH4169合金;1t电渣锭;电磁搅拌;凝固组织;二次枝晶间距;Laves相3|0|0更新时间：2026-01-21
- 摘要：In order to optimize the metallurgical efifect of calcium treatment for DC01 produced by CSP process, the composition of the nozzle nodulation, the evolution and the characteristics of inclusions in steels treated by Ca and CaAl cored wire was analyzed by SEM + EDS, influence of Al on the yield of calcium was discussed. The results show that the nozzle nodulation are mainly composed of incompletely modified calcium aluminate, Al2O3andMgO· Al2O3. Variety of Al amount in steel has little influence on vapour pressure and yield of calcium. In the same conditions of feeding speed and adding amount of Ca cored wine, the amount of residual calcium and calcium yield were higher in the steel treated by Ca cored wire compared with CaAl cored wire, inclusions modification effect is better.2|0|0更新时间：2026-01-21
- 摘要：This research investigated 8.0 mm thick high strength weathering steel Q550NQR1 with relatively low -40℃ low temperature impact value, and multiple pearlite segregation bands were observed in core microstructure, although the segregation bands are narrow and discrete, the quantity is numerous and ratio reaches 5. 8% ; through test, the segregation band in core microstructure has little effects on mechanical performance of tested steel, which is considered to be resulted from the effects of fine grain strengthening and precipitation strengthening by Nb-V micro alloying； however, the interface of ferrite and pearlite is relatively weak, which facilitates generation and extension of crack, as well as the pearlite segregation band likely leads to increase of ductile-brittle transition temperature thereby deteriorating low temperature impact toughness of tested steel. The improved technologies that increasing heating temperature and assuring enough heating time, increasing cooling rate in laminar cooling section as well as controlling the contents of Nb and V were adopted to conduct rolling, and for the final product, grain refinement achieves, pearlite segregation band vanishes, mechanical performance satisfies requirement and the surplus is appropriate, as well as -40℃low temperature impact average value increases 84.3 J.关键词：高强耐候钢Q550NQR1, 珠光体偏析, -40℃, 冲击韧性, 铌;钒2|0|0更新时间：2026-01-21
- 摘要：The microstructure and mechanical properties of V-Ti,Nb-V-Ti microalloyed non-quenched and tempered steel were investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy. The results show that the impact toughness can reach 50 J when rolling ratio is greater than or equal to 10 in the Nb-V-Ti microalloyed non-quenched and tempered steel. While the similar impact toughness is achieved when the rolling ratio reach and more than 15 in V-Ti non-quenched and tempered steel. According to the same rolling ratio, it can be found that impact toughness of Nb-V-Ti microalloyed steel is better than V-Ti non quenched and tempered steel. Niobium addition could raise the coarsening temperature of austenite, effectively inhibit quick growth of austenite, and reduce the grain size and space of pearlite lamellar. The rod cemenite gradually transformed into granular of spherical cemenite. Additionally, Nb could promote the precipitation of fine-dispersed carbides in V-Ti alloyed non-quenched and tempered steel. Therefore, after non-re- crystfdlization region deformation, the Nb-V-Ti alloyed steel could obtain the fine dual phase structure with ferrite and pearlite, and the relatively 900 ℃ temperature large deformation could further improve the strength and toughness of Nb-V- Ti non-quenched and tempered steel.关键词：微合金非调质钢, 铌;未再结晶区;大轧制比3|0|0更新时间：2026-01-21
- 摘要：The tested 316 steel (/% : 0.04C, 0.36Si, 2.OOMn, 0.009P, 0.024S, 17.74Cr, 11.74Ni, 2.56Mo) is melted by a 30 kg vacuum induction furnace and the tested adding nitrogen-saving nickel 316 steel (/% : 0. 04C, 0.25Si, 1.86Mn, 0.012P, 0.021S, 16.90Cr, 8.18Ni, 2.64Mo, 0.36N) is melted by nitrogen filled at ambient pressure and adding nitriding alloy, forged and rolled to 4 mm strip and solid-solution treated at 1 100℃ for 1 h. The erosion rate and the morphology of surface of steel erosion-tested are characterized and analyzed by electronic balance, SEM and homemade slurry erosion wear-erosion device. Results show that with increasing erosion impact angle the erosion rate of both tested austenite stainless steel increases and appears to rise-fall-rise, two peaks of erosion rate occur at erosion impact angle 45° and 90° and the max erosion rate occurs at 90°; with increasing velocity and time of erosion impact the erosion rate of both steels increases. At same conditions of erosion, the adding nitrogen-saving nickel 316 austenite stainless steel has better wear-erosion performance and lower erosion rate.关键词：增氮节镍型316奥氏体不锈钢;冲蚀;磨损率2|0|0更新时间：2026-01-21
- 摘要：The controlled rolling and cooling test was conducted on V-N-Cr microalloyed low carbon steel. There are three cooling mode, including cooling with furnace, cooling with insulation quilt, and air cooling, and the microstructure, mechanical properties and fracture morphology of three kinds of cooling system were analyzed. The results that show the fine polygonal ferrite and acicular ferrite multiphase structure were obtained in air cooling steel plate. The grain size of ferrite is 5 to 8 pim. Acicular ferrite consists of interwoven laths with width of 1 to 3μm. The tempering occurred in polygonal ferrite and acicular ferrite, and small dispersed carbides were precipitated due to the slow cooling rate in cooling with furnace and cooling with insulation quilt. Under three kinds of cooling conditions, the yield strength ≥585 MPa, tensile strength ≥ 694 MPa, elongation ≥ 27% , and 1/2 sample impact toughness at -60 °C ≥36 J are obtained. The comprehensive mechanical properties is better than GB requirements of Q550F grade. Fine grain strengthening, precipitation strengthening, and microstructural strengthening were the main ways to strengthen the steel. The impact fracture are composed of dimples, exhibiting toughness fracture mode. The grain refinement and acicular ferrite formation caused by controlled rolling and cooling effectively resist the propagation of cleavage cracks, enhancing the low temperature toughness.3|0|0更新时间：2026-01-21
- 摘要：The tested and studied steel Cr22Mo (/% ： 0.005C, 0.40Si, 0.20Mn, 0.020P, 0.010S, 22.0Cr, 1.0Mo, 0.41 Cu, 0. 14Nb, 0.19Ti, 0.012 0N) is produced by 90 t BOF-VOD-LF-200 mm slab casting-hot rolling to 5.0 mm plate-annealing and cold rolling to 1.5 ~ 0.5 mm sheet with cold rolling reduction 70% ~ 90% , and the cold-rolled sheet is annealed at 1 000 °C. The effect of cold rolling reduction on structure, texture and mechanical properties of steel Cr22Mo is studied by optical microscope, X-ray diffractometer (XRD) and universal tensile testing machine. The results show that with increasing cold rolling reduction the structure of cold-rolled and cold-rolled-annealed sheet is finer, the intensity of recrystallized texture {111}increases, average plastic strain ratio r value increases and the plane anisotropy △r decreases, and the increase of cold rolling reduction markedly improves the fbimability of cold-rolled annealed sheet of steel Cr22Mo.关键词：超纯铁素体不锈钢Cr22Mo;组织;成形性;织构;冷轧压下率2|0|0更新时间：2026-01-21
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