最新刊期
卷 42 ， 期 2 ， 2021
- 摘要：The inclusion detection methods such as sample electrolysis and ASPEX scanning electron microscope were used, the change law of type and size of nonmetallic inclusions in molten steel and cast slab of impact zone and pouring zone before and after using tundish channel filter has been studied. The results show that the submerged nozzle is not blocked after using the filter；the filter has good removal effect on inclusion particles larger than 30um. In terms of total number of inclusions ,the impact zone inclusions > billet inclusions ; the pouring zone inclusions,this is because the molten steel partial inclusions in pouring zone float up and absorb by the filter, and the Al203number of unit area in the pouring zone is significantly reduced compared with the impact zone, indicating that the filter has best removal effect on Al203series inclusions ； the size distribution of most inclusions is below 10um. After using the filter, the number of inclusions per unit area in the pouring zone is less than that in the impact zone by 23. 3%. Reasonable process parameters of tundish: molten steel flow rate 5.38 t/min,and distance between filter and long nozzle is 1200 mm.2|0|0更新时间：2026-01-21
- 摘要：The precipitation mechanism of AIN in high magnetic induction oriented silicon steel during the soaking process is systematically analyzed by the method of combining thermodynamics and kinetic calculations. The calculation results show that, at the soaking temperature of high magnetic induction oriented silicon steel, AIN in the α+γ two-phase and has the thennodynamic precipitation conditions. With uniform nucleation, grain boundary nucleation and dislocation nucleation three kinds of mechanisms, the critical nucleation size of AIN is in the same order of magnitude and decreases with decreasing temperature. At the same temperature, the critical nucleation work of AIN grain boundary nucleation is the smallest and the relative nucleation rate is the largest, that is, grain boundary nucleation is easier to occur. The fastest precipitation temperatures for uniform nucleation, grain boundary nucleation and dislocation nucleation of AIN in a phase and 7 phase are 1203 K, 1303 K, 1243 K and 1213 K, 1305 K, 1233 K, respectively. AIN mainly nucleates at grain boundaries at soaking temperature.7|0|0更新时间：2026-01-21
- 摘要：The research results show that the coarsening temperature of austenite grains of 23MnNiMoCr54 link-chain steel is 900℃ ,in order to avoid “mix grain phenomena" occured, the opitmum austenitizing temperature of steel is 850 ℃ for 30 min. Austenite grains grow exponentially with the increase of heating temperature from 850℃to 1100℃ for same holding time. The relationship between the average austenite grain size and holding time conforms to Beck model at the same heating temperature,the grain growth index (n) first decreases and then increases with increase of temperature. The austenitic grain growth model D=2.105 xl03t0.138exp( -5.18 x 104/RT)。 for 23MnNiMoCr54 link-chain steel at 950 ~ 1250 °C is obtained by fitting in Arrhenius formula.2|0|0更新时间：2026-01-21
- 摘要：Cleanliness in GCrl5 bearing steel produced by 120 t BOF-LF-RH-CC process investigated results show that the inclusions dominated in steel are Al203. MgO spinel and Al203-MgO-CaO type after LF refining and the Al2O3• MgO spinel is almost disappeared and the inclusions in steel are mainly liquid calcium aluminate after RH treatment. T. 0 content decreases to 5. 3 X 10-6after RH treatment and Al2O3• MgO spinel regenerates in tundish liquid during casting, and the ≥20um calcium aluminate inclusions are not found in liquid at end RH and tundish, and in casting bloom.2|0|0更新时间：2026-01-21
- 摘要：In order to develop magnesium-containing resulfurized free-cutting steel, the formation and evolution of inclusions are investigated by high temperature simulation experiments and thermodynamic calculations. The effect of sulfur addition on the inclusions in liquid after magnesium treatment and mechanism are specially discussed. The experimental results show that the addition of sulfur causes the transformation of magnesium inclusions in liquid steel along the path of MgO（1）一 2MgO • SiO22（s）^ MgO-SiO2-MnO(1). The results of thermodynamic calculation show that as a sufficient amount of sulfur is added to the molten steel, the [ Mg] in liquid is determined by the equilibrium of [ Mg]-[ S] instead of [ Mg]- [0] . When [ S] ≤0. 12% , the equilibrium [ Mg] exceeds 0.00078% and the equilibrium product is MgO； as 0. 12% ≤ [S] ≤0. 46% , the equilibrium [Mg] is in the range of 0.000 15% ~0.00078% and the equilibrium product is solid solution (2MgO • SiO2) and (Mg,Mn)S; as [S] >0.46% , the equilibrium [Mg] is lower than 0.00015% and the equi¬librium product is liquid inclusions (MgO-SiO2-MnO) and (Mg,Mn)S.3|0|0更新时间：2026-01-21
- 摘要：The wear-resistant steel NM360 (/% : 0. 10 〜0. 15C, 0. 50 〜1. 50Mn, W 0. 001P, 0.008S, 0. 20 〜 0. 50Mo ,0.015 ~ 0. 03Nb,0.018 ~ 0.15Ti, ' 0.035Als, 0,001 2 ~ 0.003 0B, w 0.008N, W 0.000 3 H, W 0.0030) 32 mm plate for vibration wheel of roller are designed and developed. After quenching at 900℃ . + tempering at 200 ℃, the structure of steel is tempered martensite with tensile strength 1 150 ~ 1 182 MPa,elongation 15% - 17. 5% ; impact energy 150 ~226 J surface HBW brinell hardness value 385 -402. With cold bending diameter 32 mm,and bending center angles 45°, 90°, 150° and 180° ,the bending test is all qualified. After welding with GM120 welding wire, the tensile strength of the welded joint is 1 052 MPa,the impact energy of the weld is 58 ~63 J,and the HV hardness value of the weld is 390 ~396.关键词：NM360钢;振轮;焊接性;冷弯性2|0|0更新时间：2026-01-21
- 摘要：B7 steel Φ22 mm hot-rolled rod is fractured in cold of drawing, the fractured rod is tested by chemical composition , fractography, microstructure and energy spectrum analysis. The tested results indicate that the segregation of alloy elements Mn and Cr results in that martensite exists at the center of rod caused drawing fracture. By optimizing the rolling process of reducing the coiling temperature from 905 ~915℃ to 840 ~ 850 °C and extending the holding time from 285s to 420s, martensite at the center can be effectively reduced to eliminate cold drawing rod fracture phenomenon.关键词：B7钢盘条;冷拔断裂;成分偏析;吐丝温度12|5|0更新时间：2026-01-21
- 摘要：The amount o£ molten iron for high carbon liquid tapping is 2.9% higher than the conventional process by theoretical calculation. The dephosphorization law at initial smelting period of BOF is studied, The results show that at the first stage with control of ( FeO) 15% ,slag basicity 1.8 to 2. 2 and bath temperature 1400 ~ 1450 t ,then the average dephosphorization rate up to 75% at initial smelting period of BOF. The oxygen blowing system, feeding system and bottom blowing system of smelting process are optimized, that the end-point carbon content can be increased from original 0. 07 % to 0.21% , and the end-point phosphorus content can be reduced from original 0.016% to 0.011%.关键词：120t 转炉;高碳出钢;双渣;脱磷2|0|0更新时间：2026-01-21
- 摘要：In order to meet the tensile strength Rm≥540 MPa and -40℃ V type impact energy ≥ 120 J requirements on Q420qE steel plate for bridge structure, the design with 0.05 〜0.11C and Nb-Ti microalloying is adopted. The deep desulfiirization mode, LF + RH refining and electromagnetic stirring etc processes are used to ensure the good quality of 300 mm x2010 mm cast slab by using TMCP (thermomechanical control process) technology and rolled plate stacked cooling, of developed Q420qE steel 18-26 mm plate, the yield strength is 446 -580 MPa, the tensile strength is 577 ~ 727 MPa, the elongation is 19.0% ~28.5% , and the impact absorption work at -40℃ is 129 - 287 J to meet the requirements of national standards3|0|0更新时间：2026-01-21
- 摘要：The ingredient of main inclusions in 38CrMoAl steel by 120 t BOF-LF-RH-CC process is A12O3and CaS. The CaS content decreases and the A12O3content increases with the time of refining. By calcium treatment experiments, it is obtained that the inclusions of 38CrMoAl steel could not be modified by calcium treatment, on the contrary, more CaS inclusions could be obtained by calcium treatment, leading to nozzle clogging during continuous casting of 38CrMoAl steel. The results of industrial experiments show that a good casting is obtained when the sulfur content after LF refining is controlled at 0.001% ~0.002% and no calcium is added after RH degassing.关键词：38CrMoAl钢;钙处理;CaS;水口结瘤4|0|0更新时间：2026-01-21
- 摘要：During rolling steel AISI1008 for claw machine in rolling line of steel bar,the mixed crystal phenomenon occurs. The ferrite grain size rating at the edge, 1/2 radius and center of Φ50 mm rolled bar is respectively 3,8 and 8. Through metallographic and electron microscopic examination of round steel, the finite element simulation of finish rolling temperature and equivalent strain is carried out by using Deform software. It is found that the cause of coarse grain size at the edge of round steel is related to the low finish rolling temperature and the large equivalent strain during rolling. With improvement measures to increase the finish rolling temperature from 820°C to 880°C, ,the uniformity of section grain size of round steel is successfully improved.关键词： Steel AISI1008, Mixed Crystal, Finishing Rolling Temperature, Equivalent Strain, Finite Element Simulation 2|0|0更新时间：2026-01-21
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Application of Environmental Protection Fluorine-Free Slagging Agent in Steelmaking at Pangang Group
摘要：The reaction mechanism of refining slagging of aluminum deoxidized steel at Pangang Group Xichang Steel and Vanadium Co Ltd has been studied. According the theoretical analysis, the refining slag must be high alkalinity, high CaO activity, high melting rate and low melting temperature, therefore a new fluorine-free refining slag agent is proposed, its main ingredient is (/% ：17 CaO ,45 A12O35Na2O/ MgO,5SiO2). The slagging agent has been applied at Xichang steel vanadium Co Ltd, the amount added in the LF process is controlled at about 0. 5 ~ 1.0 kg/t steel and good results have been achieved. The effect of submerged arc of new fluorin-free refining slag agent is good, the slag melting speed is fast, the time of slag formation about M3A35 some steel grades is only 3min,the ladle etching is obviously better than that using fluorite slag and the refractory material at the slag line has no obvious corrosion.关键词：环保;精炼;化渣剂;无氟2|0|0更新时间：2026-01-21 - 摘要：According to depth drill bit steel ]8CrNi3MoA's technical requirements and steel properties, three heats steel 18CrNi3MoA round bars are produced by process of 40t EAF (end [ C] ≥0. 05% , [ P]≤0. 003% , tapping temperature ≥1630℃) -LF fining (refining slag basicity 3. 0 ~4.5)-VD ( ≤70, Pa,≥ 25 min)-argon shield 1.52 t ingot-casting- ingot homogenization treated at (1250 ± 10) ℃ for 15h-forging billet Φ140 mm at 780 -810℃ forging to Φ110 mm-full annealing. The chemical constituents satisfied the technical requirements,oxygen content in forgings 12.0 x 10-6~ 13. 5 x 10-6non-metallic inclusions rating≤1 , rating of banded structure is 2, austenitic grain scale is 8.5 ,and mechanical properties test satisfiy the technical requirements.关键词：潜孔钻头;18CrNi3MoA钢;生产实践;力学性能;氧含量;晶粒度2|0|0更新时间：2026-01-21
- 摘要：Valve steel NCF3015 Φ280 mm x 1700 mm electrode (/% ： 0. 03 ~0. 08C, 13.5 〜15. 5Cr, 30 ~ 33.5Ni, 1.7-2. 1A1, 2.4 ~2.9Ti, 0.65 ~0. 80Mo, 0.65 ~0.80Nb, 0.002 - 0.006B) is remelted into Φ340 mm 0. 80 t electroslag ingot with full coaxial inert gas shielding. Under the conditions of full argon protection with ternary premelted slag 70CaF2-15Al2O3-15CaO and a melting rate 4 kg/min, the amount of burning loss of Al and Ti and the change of Si and S removal rate in the process of gas valve steel NCF3015 electroslag remelting are tested, and the mechanism is explained. The results show that Al is the main burning element relative to Ti, the average burning loss of Al is -0. 071% , and the average burning loss of Ti is -0.035% ; and the burning loss of Al and Ti gradually decreases from the bottom to the top of electroslag remelted ingot. Compared with the burning loss rate of conventional electroslag remelting ,argon protection has a significant effect on reducing the burning loss of Al and Ti, The burning loss of Al and Ti causes a slight increase in Si content at the initial stage of remelting. The slag system has a certain desulfurization effect, with an average desulfurization rate of 36.7 % .关键词：电渣重熔;氩气保护;气阀钢NCF3015;钛烧损;铝烧损;硅烧损2|0|0更新时间：2026-01-21
- 摘要：The effect of heat treatment process on metallographic structure and mechanical properties of SA-738Gr. B steel plate has been studied. And the factors led to instability of tensile test performance in delivery state and low tensile strength after SPWHT are analyzed. At the same time, technological measures to improve the stability of steel plate SA- 738 Gr. B have been worked out. The test results show that steel plate SA-738Gr. B quenched at 915 ~935 ℃ and tempered at 675℃ ,and simulated post-welded heat-treated (SPWHT) has excellent mechanical properties to meet the using requirement.关键词：热处理工艺;金相组织;模拟焊后热处理;抗拉强度2|0|0更新时间：2026-01-21
- 摘要：The 1900 MPa Ti microaUyed ultra HSLA steel (/% ：0.34C,0.70Si, 1.50Mn,0.012P,0.004S,0.08Ti, 0. 002 0B,0. 004 ON) is developed by 200 kg vacuum induction furnace and 550 mm slab mill. The results show that with first stage starting and final rolling temperature respectively at 1180 °C and 1030 °C in austenite recrystallization zone, and with second stage starting rolling temperature at 920 ~ 950 °C and final rolling temperature at 850 ~ 890 °C in austenite nonrecrystallization zone,then quenching at (900 ± 10)°C and tempering at 200 〜230°Cthe plate precipitated phase is (Ti, Mo)C,the grain size rating is 10,the structure is tempered martensite,with the mechanical properties are Rm 1930 〜1985 MPa,A 10% ~ 12.5% , -40 T Kv2200 ~ 230 J.关键词：1900MPa级超高强钢;控制轧制;淬火加低温回火;析出相;力学性能2|0|0更新时间：2026-01-21
- 摘要：The propertes and microtnicture of high-speed axle steel DZ1 and DZ2 with Ni contents 0. 20% ,0. 80% and 1. 20% are studied by using metalloraphic microscope and SEM etc. The results show that with Ni content increasing from 0. 20% to 1. 20% , the tensile strength and yield strength of the steel increases respectively from 710 MPa to 759 MPa and from 535 MPa to 608 MPa； the impact toughness of steel at 20 ℃ and -40 ℃. impact toughness is inproved, especially at -40 ℃, the transvese impact energy of steel increases from 87 J of 0. 20% Ni contents to 136 J of 1. 20% Ni contentsand the longitudinal impact energy of steel increases from 94 J to 179 J； the temperature of steel's tough-brittle transition decreases from -30℃ to - 100 ℃. The high-speed railway axle steel structure of 3 kinds of composition is Bainite + tempered martensite structure, and the bainite volume increases with the increase of Ni content, and steel microstructure became finer and more uniform after the increase of Ni content.2|0|0更新时间：2026-01-21
- 摘要：The 250 mm casting slab of steel Q355D bearing 0. 14% ~ 0. 18% C and 1.40% ~ 1.60% Mn is hot-rolled by the controlled rolling process. The results show that the microstructure of rolled plate is fine and uniform by rough rolling at 1050 - 1130℃ , finishing rolling at 920℃ and final rolling at 880 ℃ , and the final cooling below 670℃ , the properties of the 70 mm and 80 mm thick plate can meet the requirements of Q355D steel grade and the Z25 reduction of area (RA) is 58% 〜64% to meet the requirement of Z25 directionRA≥25%.关键词：低合金钢Q355D;厚板;控轧控冷;力学性能;组织2|0|0更新时间：2026-01-21
- 摘要：The effect of three kinds of process quenching + lamellarizing ( quenching from intercritical temperature) + tempering (QLT) , quenching + tempering( QT) , double normalizing + tempering ( NNT) on low temperature toughness of 5 mm 9Ni steel plate has been studied. The results show that the steel plate with NNT has good ductility at low temperature ,good plate shape and 8. 0% reverse austenite content by using double normalizing and tempering process. Through industrial trial production, the -196 ℃ charpy absorption energy of 5 mm 9Ni steel plate with 3. 3 mm thickness specimen is 40 J； and that with the 2. 5 mm thickness specimen is m27 J.关键词： 5mm 9Ni Steel Plate, Reverse Austenite, - 196 °C Charpy Absorption Energy 2|0|0更新时间：2026-01-21
- 摘要：With the process measures including composition controlling by 180 t LD with top-bottom blowing and Ti microalloying by LF, continuous casting into 230 mm slabs and heating at 1200 ~ 1250℃, rapid cooling after controlled rolling, coiling at 500 ~700 ℃ ,Shanxi Taigang Stainless Steel Co Ltd has successfully developed 2 mm hot-rolled enamel steel sheet for water heater tank (/% : ≤0.14C, ≤1.20Mn. ≤0.030P,≤0.025S ,≤0.l0Ti). The results show that the steel sheet after simulated enamelling at 850 ℃ for 10 min still has high strength (Rm 366 MPa) and good formability ；the hot-rolled grain is uniform and fine, and there is no obvious change in grain size after enamel, and there are a large number of second phase particles dispersed precipitation ； for commercial produced enamel steel after single-sided enamel ,it shows good scale explosion resistance and can meet the application requirements of making water heater tank.关键词：热水器内胆;热轧;搪瓷钢;析出相2|0|0更新时间：2026-01-21
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