最新刊期
卷 40 ， 期 4 ， 2019
- 摘要：Hot compression deformation of steel 34CrMo4H with strain rate 0.1 ~ 10 s-1at 800 ~ 1200 ℃ has been tested and studied by using Gleeble-3800 thermo-mechanical simulator to analyze in hot deformation of this steel. The relationships between flow stress and strain rate, as well as flow stress and deformation temperature were studied. Results show that the flow stress increases with the increase of strain rates and decreases with the increase of temperature, and as the strain rate is 0. 1 s-1the feature of dynamic recrystallization occurs obviously on flow stress curves of steel. The hot deform activation energy of steel 34CrMo4H is 395.45 kJ/mol.3|0|0更新时间：2026-01-21
- 摘要：Oxide Scale of wire plays a role to protect wire from rust, but it also needs to be removed easily when pickling. The thickness of iron scale and its phase structure are the main factors affecting the removal or adhesion of iron scale. The effects of finishing rolling temperature and spinning temperature on the phase structure of φ12 mm SCM435 scale were studied by testing and analyzing the thickness and phase structure of oxide scale under different rolling conditions. The results show that with the increase of finishing temperature or spinning temperature, the oxide scale thickness of SCM435 wire increases, and a thicker oxide scale (about 20 micron) will be formed in a short time between 800 ℃ and 900 ℃. Because of the oxidation selectivity of Cr, the iron oxide scale has a high FeO ratio when the Rnishing temperature is above 870 ℃ and the spinning temperature is above 810 °C. However, when the spinning temperature is higher than 860 ℃ , the change of phase structure tends to slow down, and the ratio of FeO does not change much.8|0|0更新时间：2026-01-21
- 摘要：Evolutionand formation of Ti-bearing inclusions in AISI 321 stainless steel in ignoring casting process was investigated. The industrial test results show that titanium oxidation occurs after Ti addition in LF process and the proportion of Ti2O3in the average inclusions compositions increased along with the smelting process. The TiN inclusions observed were pure TiN and TiN with core MgO and MgO·Al203or with minor core TiOx-MgO-Al2O3. Moreover,the stable diagram of Ti- Al-0 and Ti-N in the liquid steel and precipitation of TiN during solidification were also calculated by thermodynamic software Factsage.2|0|0更新时间：2026-01-21
- 摘要：Based on the analysis of the key influencing factors of H2S corrosion resistant steel plate ( wass fraction/% ：0.16C,0.32Si,1.25Mn,0.018Al,0.0007S,0.007P) in failure process,the mechanism of H2S corrosion failure and the method of improving the corrosion resistance of H2S are illustrated by comparing the influence of inclusion and banded structure on H2S corrosion performance. The results show that MnS inclusion and continuous banded structure are the key factors that lead to the corrosion cracking of H2S, and the HIC corrosion performance can be obviously improved as the banded structure is changed by continuous-intermittent twice 880 ℃ as 60 min normalized treatment and the Length crack sensitivity is 0.关键词：H2S;MnS夹杂, 带状组织, 正火处理10|0|0更新时间：2026-01-21
- 摘要：The production process flowsheet of wind power gear ring of steel F42CrMo4 is hot metal-100 t EAF-LF- VD-Φ500 mm CCM-slow cooling-forged to Φ2000 ~ 3900 mm ring forgings. The analysis on sampling at wind power gear ring defect region by ultrasonic positioning shows that the main causes for some batch of wind power gear ring of steel F42CrMo4 unqualified by detection test are aluminum oxide inclusions and porosity defects of casting bloom. With the process measures including controlling EAF end carbon >0. 15% , the end point of LF was fed with 0.5 kg/t calcium wire, and after fed with calcium, argon was blown soft >10 min, after VD the argon blowing rate increasing to 2 X30 L/min from original 2x25 L/min, and controlling liquid super-extent 10 ~ 18 ℃，the nitrogen, hydrogen and oxygen content in steel decrease respectively from ≤80 x 10-6≤ l. 5 x 10-6and≤ 20 x 10-6to ≤ 75 x 10-6≤ 1.2 x 10-6and ≤ 15 x 10-6and the detection qualified rate of forgings increases to more than 98.95%.4|0|0更新时间：2026-01-21
- 摘要：Inconel 690 alloy is widely used in steam generator heat transfer tubes in nuclear power plants. It usually u¬ses the vacuum induction furnace smelting consumable electrode,smelting cost is high. In this study,the thermodynamic analysis and reduction process of Inconel 690 alloy melt were discussed, and it was considered that the consumable electrode meeting the standard requirements could be produced by the arc furnace + argon oxygen refining furnace smelting process. The practice shows that the process is feasible, the chemical composition of the consumable electrode meets the requirements, and the gas content is low. For the production of the product opened up a low cost, high efficiency smelting process.2|0|0更新时间：2026-01-21
- 摘要：Vertical continuous casting is used to produce 304L stainless steel in a domestic plant, but edge cracks are easy to form in the rolling process. By means of chemical composition analysis, microstructural observation, energy spectrum analysis and high temperature mechanical properties testing, the structure fracture morphology and inclusions at the edge cracks of steel were studied. The results show that the structure of hot rolled 304L plate is austenite and ferrite. The crack passes through the two-phase structure and results in the compression deformation of the structure. The CaO-SiO2-Al2O3- MgO composite inclusions are contained and the inclusions contain Na and K elements. Finally, it is found that the mould powder entrapped in the production process is the cause of edge cracks in hot rolling plate.关键词：304L不锈钢;边裂;保护渣2|0|0更新时间：2026-01-21
- 摘要：In the reduction period of AOD production stainless steel slag has a high melting point when the binary basicity is above 2.0,More than 15 kg/t fluorite was added to complete the slag melting. The mechanism of slag reduction in AOD was analyzed, and the effect of slag reduction without fluorite at different alkalinity was tested. The results show that, the results show that it is feasible to rely on the low-basicity technology for the primary reduction of slag, but the secondary reduction should be added, that is, the basicity of the primary reduction of AOD slag should be controlled at 1.7, and lime and fluorite should be added for the secondary reduction and desulfurization after slag pouring to prevent the carburization caused by ladle erosion caused by steel peroxidation. At the same time, in order to eliminate the carburization of lime and maintain good activity, the reduction o£ secondary adding lime was controlled at 2% 〜4%.2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of non-quenched and tempered steel 49MnVS3 (/% ：0.47C,0.39Si,0.90Mn,0.016P,0.050S,0. 22Cr,0.09V,0.015Ti,0.011Al,0.02Ni) is pretreated hot-metal-60 t top and bottom combined brown converter-LF-VD-220 mm x300 mm bloom casting-contronled rolling and cooling, study the effect of contronled rolling and cooling process on microstructure and properties of non-quenched and tempered steel 49MnVS3. Test parameters of φ110 mm rolled products: heating temperature of 1150 - 1250℃,start rolling temperature 1050℃ and finishing temperature 850 ℃ ,70 Y/min cooling speed after rolling,cooling start temperature of 850 ℃, and the end temperature 500 ℃.Ilie results showed that the grain size of the test furnace was improved by 0.5 ~ 1.0 and the banded structure was reduced by 0.5 ~ 1.5, the hardness, strength and plasticity are improved, and a good match of strength and toughness is obtained.关键词：控轧控冷;非调质钢;工艺参数;强韧性2|0|0更新时间：2026-01-21
- 摘要：In the process of producing 410S stainless steel by Xinggang one-step method ( dephosphorization station + 60 t AOD + LF) , the tap-to-tap cycle of AOD is much larger than that of continuous casting machine pouring and dephosphorization station and the lower part of continuous casting nozzle etches seriously. It is impossible to realize continous-con- tinuous casting, which seriously affects the operation rate of continuous casting machine and the consumption of overall steel materials. Increasing the number of single-in-one continuous casting furnaces is beneficial to reduce the number of tundish used, increase the operating rate of the continuous casting machine, reduce the consumption of steel materials, reduce the consumption of auxiliary materials for continuous casting machines and energy media. By reasonably increasing the proportion of cold-returned scrap into the furnace (3.5 t/heat) , selecting the appropriate silicon content 3.5% to shorten the tap-tap cycle of the 410S stainless steel AOD to 71 minutes, the continuous casting machine adopts the split-pack water inlet quick change, so that the continuous casting 6 heats were raised to 12 heats.2|0|0更新时间：2026-01-21
- 摘要：The magnetic properties of non-oriented electrical steels are closely related to the cleanliness level. In order to achieve reasonable control of oxygen in non-oriented electrical steel smelting process,the change of carbon and oxygen content were analyzed, the critical carbon content at the end-point of BOF and αFeOin slag were also calculated. The results show that with the decrease of end-point carbon content, the end-point oxygen content increases and fluctuates widely. The ideal carbon content in tapping should be controlled at 0. 03% ~0. 05%. It is required that the content of T. Fe in slag should be ≤ 24% and the end-point carbon content should be higher than 0.031%. Ladle botton argon blowing can effectively reduce excess oxygen and decrease carbon-oxygen product in molten steel. According to production data, the ideal carbon and oxygen content should be controlled at 0.025% ~0. 035% and 500 X 10-6~650 X 10-6before RH refining, and the end-point carbon content of BOF should be controlled at 0.03% ~0.04%.2|0|0更新时间：2026-01-21
- 摘要：The microstructure, impact performance and fracture morphology of 42CrMo steel after pre-heat treatment (annealing,quenching, tempering) and treatment of quenching from dual phase range + tempering at high temperature ( also referred to as quenching from critical range + tempering) were observed and analyzed by means of metallographic micro¬scope , hardness tester and scanning electron microscope. The results show that the residual ferrite is uneven in distribution between tempered sorbite when the preparatory heat treatment is tempering, whereas the residual ferrite is small and even when the preparatory heat treatment is quenching and hardening and tempering. The hardness difference of sub-heat treatment is very small when different preparation heat treatment is used. After sub-temperature treatment, the impact performance of 42CrMo steel is higher than that of conventional hardening and tempering. When pre-heat treatment is hardening and tempering, the impact energy after sub-temperature treatment is the largest, and it can be seen from the fracture morphology. The cracking area and crack fiber expansion area of hardening and tempering account for a larger proportion than annealing and quenching. Therefore, the hardening and tempering treatment is more suitable as a preparatory heat treatment for the 42CrMo steel.2|0|0更新时间：2026-01-21
- 摘要：The addition of molybdenum in stainless steel can greatly improve its pitting resistance. However, the addition of molybdenum in medium-high chromium ferritic stainless steel promotes the formation of chromium-rich or molybdenum-rich precipitates in the structure, which can reduce the pitting resistance of the material to a certain extent. So the development of a suitable heat treatment process is an important part of the production of molybdenum-containing ferritic stain¬less steel. This paper takes the 0Crl7Mo2S as an example, the effects of different heat treatment temperature 750 〜1050℃ on the microstructure , mechanical properties and precipitates of the material.Material Index Heat Treatment Process, Mo-Containing Stainless Steel, Metallurgical Structure, Precipitate Phase.关键词：热处理;含钼不锈钢;组织;析出相6|0|0更新时间：2026-01-21
- 摘要：The effects of different heat treatment temperatures on the mechanical properties, microstructure and corrosion resistance of 316L/Q370qE were investigated by means of scanning electron microscopy (SEM) , hardness tester, universal testing machine and salt spray box. The experiment can be concluded that the diffusion zone width of the three samples is widened with temperature increasing at heat treatment temperatures of 400 °C, 700°C and 1100 °C. The shear strength at the interface of 316L/Q370qE composite board is greater than 385 MPa, which is greater than 210 MPa required by specifications. The 316L side is dominated by pitting in the salt spray environment, and the Q370qE side is dominated by uniform corrosion. The annual corrosion rate is the lowest at 400 Y and the highest at 700°C.3|0|0更新时间：2026-01-21
- 摘要：Based on electromagnetic stirring (EMS) in the electroslag process fbr bearing steel GCrl5,the effects of EMS on the superalloy solidification structure and chemical composition are analyzed. The result is as follows: Electromagnetic electroslag can signiHcantly improve the heat transfer condition of ingot solidification process, reduce the formation of network carbide in steel GCrl5 ingot. At the same time, because of the effect of electromagnetic stirring, the segregation index of main elements such as C and Cr in the ingot is stable less than 1.03. When the stirring current is 50 A to 2(X) A, the frequency is 6Hz. , there is no net carbide in the center of the ingot, and the carbon segregation index is 1.02.2|0|0更新时间：2026-01-21
- 摘要：Concerning the phenomenon of high residual Cr in steel bar,the influence of the mass fraction of Cr,Mn alloy elements on the mechanical properties and microstructure of HRB400 test steel bars in laboratory conditions is studied. The relationship between mechanical properties and the content of pearlite, and the microstructure of precipitated particles was also analyzed by transmission electron microscopy. The experimental results are as follows. At low, medium and high Mn content of 1.15% ,1.25% and 1.35% respectively, the yield strength and tensile strength of test steel bars raised with the increase of Cr. Cr played a certain strengthening role,which can reduce Mn addition. The content of pearlite raised with increasinhg Cr from 0.1% to 0.3% ,the average grain size was 8 ~9,Meanwhile,Cr-Fe-Mn composite alloy cementite and Cr carbide have been precipitated from steel. The microstructure and mechanical properties of the reinforced rebar with 0.125% _0.135%Mn,0.20% Cr meet the requirements of international standard. Based on the test results and the current price of alloying elements, the cost per ton of steel can be reduced by about 20 yuan.2|0|0更新时间：2026-01-21
- 摘要：Effect of Nb-V addition (Nb 0 ~0.072% , V 0.09% ~0.12% ) on austenite grain growth behavior of high-carbon steels (0.70% ~0.73%C) in 900 ~ 1200℃ is studied, and the continuously cooled transformed curves of steel are investigated by Gleeble-3800 thermal-mechanical simulator, and the influence of cooling rates on microstructure and hardness of steel is investigated using optical microscope and hardness tester. The results show that with increasing Nb and V content in steel the austenite grain size is fining and grain grown tendency of the steel is smaller, and CCT curves move to the lower right, and the formation and end point of bainite and martensite shift towards low cooling rate, the end point decreases from 8 Y/s to 3 P/s,and the hardness of sample increase with increase of Nb/V content.关键词：高碳钢, 铌;钒;连续冷却相转变;组织3|1|0更新时间：2026-01-21
- 摘要：Descaling property of oxide scale of welding wire ER70S-6 was studied by twisting test and by scanning electron microscopy. It was found that, silicon rich layer with iron-silicon oxide Fe2SiO4(2FeO· SiO2) and FeO as the main component just outside of the matrix is difficult to be eliminated completely by mechanical bending and abrasive belt grinding, and thus to deteriorate copper plating effect and welding performance of the wire product. With measures including impeding diffusion of oxygen into the silicon-rich layer by increasing the temperature of the heating section to 985 ℃;and soaking section to 1110℃ in heating furnace, to promote disproportionation reaction of FeO by establishing the thermal insulation wall and by established thermal insulation corridor around the PF line, to decrease the indentation of oxide scale to the matrix by shortening the roll change time of the finishing mill for 3 h, increasing thickness of oxide scale by reducing the spinning speed to 90 m/s and increasing the spinning temperature to 930 ℃, the effect of mechanical descaling of oxide scale is improved. The peeling form of oxide scale changed from the powder to the lamellar, the intermittent blackening of semi-finished product disappeared, the average thickness of the copper plating layer increased from 1.45μm to 3.6μm, and the surface brightness was significantly improved through the process optimization.2|0|0更新时间：2026-01-21
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