最新刊期
卷 43 ， 期 4 ， 2022
- 摘要：Taking Q460 steel (/% ：0. 17C,0. 35Si, 1. 5Mn, 0. 020P, 0.020S,0. 020Nb, 0. 075V) 3 250 mm x 150 mm wide slab as the research object, the solidification heat transfer model is established by ANSYS software, and the effects of casting speed, specific water rate and superheat etc process parameters on the solidification process of slab are studied. The simulation results show that when the casting speed increases by 0. 10 m/min, the surface temperature of slab at the straightening section increases by 36. 5 ℃ , the slab temperature increases by 50℃，the shell thickness decreases by 2. 4 mm, and the liquid core length increases by 1. 2 m； with increase of superheat of 1 ℃, the center temperature of upper surface of slab at the straightening point increases by 1. 73 °C and the length of the liquid core is extended by 0. 11 m； therefore, the casting speed is the key to quality of slab. Production application shows that by 3 250 mm x 150 mm slab cast speed 1. 20 ~ 1. 25 m/min, with superheat 15 〜20 ℃,the temperature of slab surface at straightening section is more than 950 ℃,to decrease the rating of center porosity and segregation and obviously increase surface quality.3|0|0更新时间：2026-01-21
- 摘要：The hot plasticity of S32750 dual phase steel (/% ：0. 20C,25. 50Cr,7. 05Ni,3. 50Mo,0. 28N) casting and solid-solution condition columnar zone and equiaxed zone at 1 000 ~ 1 200℃ is studied by Gleeble thermal. The results obtained elongation and reduction of area of the steel at 1 100 - 1 150 °C are best. With the analyzed by SEM, the S32750 steel is brittle fracture at 1 000 〜1 050 ℃,tough fracture at 1 050 ~ 1 150 ℃. and intergranular failure at 1 150 - 1 200 ℃. And the crack of S32750 steel is along interphase at 1 000 ~ 1 050 ℃ , and along intergranular boundaryat 1 150-1 200 °C. The optimum thermoplastic temperature of S32750 steel is determined to be 1 150-1 200 ℃ by integrating the thermal simulation test.4|1|0更新时间：2026-01-21
- 摘要：The evolution of inclusions in the refining process of EH36 steel produced by the route of "120 t BOF-LF- RH-260 mm slab CC” has been researched. Through sampling and testing of each working procedure in situ, in combination with inclusions thermodynamic calculation, the variations of inclusion types and size are analyzed. It is found that the number density of inclusions in steel gradually decreases , but the number density of >5μmlarge particle inclusions gradually increases during the refining process of MLF—>RH—>tundish". The main types of large particle inclusions are MnO- SiO2series oxide and CaO Al2O3series calcium aluminate, such as 3 CaO·Al2O312CaO ·Al2O3and CaO・Al2O3. During the refining process, CaO · 6Al2O3and CaO ·2Al2O3are formed first when the Ca content in steel is low, and the main inclusions of 12CaO , 7Al2O33CaO , Al2O3are formed with Ca content increasing in steel.2|0|0更新时间：2026-01-21
- 摘要：Based on the mechanics of materials and the elastic-plastic theory, the various bending load-deflection curves are studied on different steel grade, heat treatments and conditions in industry. The results show that the second stage of the bending load-deflection curves of steels can be simply treated as an linear relationship in the actual straightening deformation range and the straightening theorem of steel fr = K·(f - fm ) is deduced, which accurately describes the relationship between the residual plastic bending deflection and the total bending deflection after bending. When straightening according to the straightening theorem, the straightening process can be controlled easily and directly, and the straightening quality and efficiency are raised. Particularly, the efficiency of press straightening can be increased by 30 ~ 80 times. This straightening theorem fills the gap that there was no direct calculating formula of residual plastic bending deflection after bending before in the straightening field and enriches the current straightening theory and it has important scientific significance to promote the development of straightening technology and the design and manufacture of straightening equipment.2|0|0更新时间：2026-01-21
- 摘要：The evolution of inclusions in gear steel 18CrNiMo7-6 produced by 70 t EAF + LF + RH process is systematically analyzed and studied by means of whole process sampling and ASPEX test. The test results show that sampling after adjusting the composition during LF refining the removal rate of inclusions with size 1 ~ 10 μm is 89% , with > 10 μm is 97% , from adjusting the composition during LF refining to the end of soft blowing, and the removal rate of size 1 ~ 10 μm inclusions reaches 54% removal rate of inclusions > 10 μm is 66% , and the inclusions > 20|im are basically removed. The inclusion completes the transformation from Al2O3 →Al2O3 ·MgO →Al2O3· CaO.关键词：70 t EAF + LF + RH;18CrNiMo7-6齿轮钢, 夹杂物;ASPEX分析3|0|0更新时间：2026-01-21
- 摘要：In order to reduce the center carbon segregation of SWRH82A steel 150mm x 150 mm cast billet, the experiments with different continuous casting processes including casting speed (1. 9 ~ 2. 3 m/min), water ratio in secondary cooling zone (0. 75 ~ 1.24 L/kg) , degree of liquid superheat (25 - 28 °C ) , mold electromagnetic stirring intensity (300 ~ 350 A) and end electromagnetic stirring intensity (300 ~ 470 A) have been carried out. The results prove that when the casting speed is 1. 9 ~2. 0 m/min, the liquid superheat is about 25 °C , the water ratio is 1. 01 L/kg,the mold electromagnetic stirring intensity is 350 A/3 Hz, and the end electromagnetic stirring intensity is 400 A/7 Hz, the billet center carbon segregation index can be large improved decreasing from original 1. 21 to 1. 05.关键词： SWRH82A钢;150 mm x 150 mm小方坯; 中心碳偏析2|0|0更新时间：2026-01-21
- 摘要：The main process technology of 120 t BOF-LF-VD-350 mm x430 mm cast bloom-150 mm x 150 mm rolled billet flow sheet produced ML45Mn2 steel Φ16 mm and Φ 18 mm wire rod is using refining slag with basicity of 1.5 ~2.0, 52 ton tundish, electromagnetic stirring, light and heavy reducing, initial rolling at 1 010 ~ 1 070 °C , finishing rolling at 820 ~ 850 °C,coiling at 780 ~ 820 °C, and cooling rate 0.15 ~ 0.4 °C/s. The test results show that of ML45Mn2 steel hot rolled wire rod, the average tensile strength is 797 MPa, the average reduction of area is 50.3% ,1/4 of the cold heading is qualified, the metallurgical structure is pearlite + ferrite, the average section hardness value is 92.5HRB, the band structure is 1.5 ~ 2.5 to meet the technical requirements.关键词：冷镦钢;ML45Mn2;控轧控冷10|3|0更新时间：2026-01-21
- 摘要：The cold heading cracked samples and Φ 12 mm hot-rolled wire rods of SWRCH35K steel are inspected by optical microscope. Analysis results show that the reason for cold heading cracking is full decarburized layer exist on the surface of hot-rolled wire rod, led to decrease of strength, resulting in stress cracking of the surface layer during the cold upsetting process. By decreasing billet heating temperature from original 1 000 〜1 150 °C to 950 〜1 050 °C , controlling air-fuel ratio 0. 4 ~0. 6, and decreasing billet total heating time from original 95 ~212 min to 95 ~ 158 min, the full decarburized layer of SWRCH35K steel hot-rolled wire rod is effectively eliminated, and the cold heading cracking in the production process of bolts and nuts is avoided.关键词：冷镦开裂螺栓、螺母;SWRCH35K钢;完全脱碳层;加热工艺10|3|0更新时间：2026-01-21
- 摘要：By analysis on structure of low carbon Nb-V micro-alloying CB890QL steel with control-rolling from 305 mm x315 mm mediate bloom by continuous rolling speed 0. 6 ~0. 8 m/s at 950 ~ 1 028 °C , it is obtained that the dynamic recovery of the tested steel is mainly in rolling process, with the rolling speed of 0. 8 m/s, as the rolling temperature is reduced from 1 028 X. to 950 °C , the grains of steel are refined continuously, and there is also a big difference in grain size. With the rolling speed 0. 6 m/s in Φ 200 mm steel, the grain size does not change linearly with the decrease of temperature. When the continuous rolling temperature is 980 °C and the rolling speed is 0. 6 m/s, the fine and uniform microstructure of test steel can be obtained.2|0|0更新时间：2026-01-21
- 摘要：The GCr15 steel production flow steel is 120 t BOF-LF-RH-CC process. As adding 200 kg aluminum block at BOF tapping for strong deoxidation and controlling the aluminum content 0.030% ~ 0.045% in steel in LF process, at end LF the main inclusions in steel are MgO ·Al2O3and the MgO.Al2O3inclusions are removed during RH degassing and the calcium aluminate inclusions are main inclusions in steel after RH. However, but MgO·Al2O3inclusions are formed again in the tundish steel. Due to the existence of Al-MgO and C-MgO reactions in LF refining process, the MgO ·Al2O3inclusions could be formed again after LF refining in high carbon aluminum deoxidized GCr15 bearing steel. However, when just adding 40 kg aluminum block for preliminary deoxidation in the BOF tapping process, the amount of MgO·Al2O3inclusions in steel significantly decrease after LF refining, and the regeneration of MgO.Al2O3inclusions in tundish steel could be prevented. In addition, adding low titanium and low aluminum ferrosilicon in the LF refining process instead of adding in tapping process effectively control the amount of MgO · Al2O3inclusions in steel.2|0|0更新时间：2026-01-21
- 摘要：TiN inclusions are one of the main reasons for wire breakage during drawing or twisting of C82DA cord steel. The 110 t BOF-LF-150 mm x 150 mm CC smelting process is used to produce C82DA steel. The research on the precipitation conditions of TiN, TiN inclusions can be reduced by decreasing the Ti and N content in molten steel. By means of controlling the amount of going down slag from converter, using alloys and slag materials with low titanium content, and controlling the amount of ladle residual slag, it can reduce the titanium content in molten steel. By shortening the BOF tapping time ≤4 min, maintaining the tap hole to avoid loose flow and trickle, optimizing the continuous casting nozzle, etc., it can reduce the nitrogen addition amount, Ti and N content of C82DA steel can be controlled to ≤ 2X10-6and ≤50 x 10-6respectively, to obviously decrease the TiN inclusions in steel.2|0|0更新时间：2026-01-21
- 摘要：By metallographic microscope, electron microscope etc. analyzing, it is obtained that surface serious decarburization of the C70S6 steel surface seriously causes the connecting rod expansion-broken bits dropping out, and internal quality defects. By optimizing the content of Al, V, and P, the ferrite constituent in steel decreases from orignial 5. 5% 〜8. 6% to 2. 7% 〜4. 8% ,and by using measures including continuous casting superheat reduced from≤35 ℃. to 30 ℃，casting speed reduced from 0. 80 ~0. 90 m/min to 0. 65 ~ 0. 75 m/min, electromagnetic stirring current at the end increased from 200 A to 300 A； coating the cast billet before rolling, air-fuel ratio in the high temperature section of the heating furnace reduced from 0. 7 ~ 0. 8 to 0. 5 ~ 0. 6, heating temperature increased to 1 200 ~ 1 250 °C ； and increasing cooling rate after rolling, the segregation of C in the center of the C70S6 steel is reduced to 0. 99 ~ 1. 04, the depth of the surface decarburization layer is ≤ 0.50% d, the grain size rating is 5. 5 ~ 6. 0, and the ferrite content is ≤5.0% , successfully solved the problem of bits dropping in batches of connecting rods.3|0|0更新时间：2026-01-21
- 摘要：4 ~ 100 mm 17Mn plate damping steel plate (/% ： 0. 02C, 0. 08Si, 17.53Mn, 0.014P, 0. 002S, 0.005Als) was developed and produced by Ansteel, with properties of yield strength 311 -407 MPa, 15 〜100 mm plate -20 °C V-notch impact energy 113 ~ 144 J, the tensile strength of welded joint 651 ~654 MPa, and-20°C V-notch impact energy 66 〜84 J after welding. The microstructure of the 17Mn damping steel is residual austenite and e martensite, and its damping property is tested using a dynamic mechanical thermal analyzer. Under the condition of double cantilever strain scanning at 30°C and 50 Hz, the damping values of the different thickness damping steels are greater than 0.02. At 100 Hz, the damping values of damping steels of different thicknesses are all greater than 0.05, and the damping values are higher than those of traditional low-alloy structural steels Q235 and Q345 (0.008 and 0.010 ~0.013).2|0|0更新时间：2026-01-21
- 摘要：The 2311 die steel 16 ~ 80 mm plate is produced by KR desulfphrization-130 t BOF-LF-RH-300 mm cast slab-rolling-580 -610 °C tempering process. The results show that for 2311 steel (/% : C 0. 38 ~0.42, Si 0.25 ~0. 35 , Mn 1.30 ~ 1.50, P≤0.020, S≤0.005, Cr 1.80 ~2.00, Mo 0.17 ~0.25, Als 0.015 ~0.045) , through alloys rational division in converter-LF-RH process, the composition hit rate of the molten steel in tundish can be improved; using weak cooling and low speed casting (0.70 ~0.75 m/min) , pit cooling and slow heating (10-12 min/cm) , the slab cracking can be avoided； with thermo-mechanical rolling control process (TMCP) +580 -610 °C tempering process, the thickness 16 - 80 mm steel plate with hardness value 28 ~33HRC, cross-sectional hardness deviation value W3HRC, metallographic organization of tempered bainite, and eliminating internal stress of microstructure can be achieved. Finally, the performance and microstructures of the steel plate can meet the requirements of 2311 pre-hardened die steel.447|0|0更新时间：2026-01-21
- 摘要：According to analysis on the scab defects on the surface of 10B21 boron-containing steel (/% ：0.18 〜 0.23C, ≤ l.0Si, 0.60 ~0.90Mn,≤ 0.025P, ≤ 0.020S, ≥0.015 Alt, ≥0.008B) wire rod and the surface cracks on the comers of continuous casting billet, by optimizing the composition control of steel (/% ：0.020 ~ 0.050Alt,0.03 〜0.05Ti, ≤0.0060N,0.000 8 ~0.0012B) , increasing the drawing speed to 2.3 ~2.4 m/min to ensure the through stretching and straightening temperature of the slab ≥980 ℃；by reducing the specific water strength of the secondary cooling of continuous casting from original 1.29 L/kg to 1.05 L/kg, etc, that can effectively control the comer crack on the surface of continuous casting billet, the scale defect rate is declined from the original 15% to less than 1% after the roiled wire rod.关键词：含硼冷镦钢10B21;合金成分;表面裂纹;工艺优化2|0|0更新时间：2026-01-21
- 摘要：The Φ219 mm x 20 mm seamless tube of 09MnNiD steel (/% ；0.07 ~ 0.10G,0. 25 ~ 0.35Si, 1.35〜1.40Mn,0.49 〜0.51Ni,0.020 ~O.O35A1, ≤0. 02Nb, ≤0.015P, ≤0.006S) has been produced by 20 t EAF—LF + VD→ ingot casting —► rolling Φ270 mm round billet—► cross piercing → CPE rolling tube—► online normalization. By controlling EAF endpoint [C] ≤ 0.04% and [ P] W≤ 0. 008% , LF refining [S] ≤ 0.005% ,VD≤67Pa, 15 min, ingot cast steel overheating ≤ 45 °C , cooling rate of hot rolled piercing shell 30 ~70 P/min, and steel tube normalizing at 910 °C. The test results show that the microstructure is F + P, grain size grade 10, —70 °C impact energy KV2 3257 J, tensile strength 503 〜508 MPa,yield strength 354~356 MPa,and the chemical composition, mechanical properties, nondestructive testing meet the requirements of GB 150.2-2011 standard.关键词： -70 °C 09MnNiD钢;Φ 219mmx20 mm无缝管在线常化, 晶粒细化2|0|0更新时间：2026-01-21
- 摘要：By using combination teachnology of 20 t EAF-LF-VD, 20 t argon protection ESR unit remelting, 1 250 ~1 280 ℃ high temperature homogenization treatment, 60 MN oil pressure quick forging machine multiple forging and 1 000 〜1 050 ℃ high temperature solution treatment process, the inclusion(≤0.5 rating) , structure and lateral impact energy (KV2 25 〜31 J) of produced 640 mm x 1 100 mm 4Cr5Mo2V heavy die steel are higher than the requirement in standard NADCA#207-2018 for advanced steel leave,and the isotropy of steel reaches 0.95.462|1|0更新时间：2026-01-21
- 摘要：The influence of treated time of standard treated process 980 ℃ 1 h solid solution-825 ℃ 2. 5 h stabilizing- 720 ℃ 8 h +620 ℃ 8 h aging on the structure and properties of IN706 alloy (/% ：0. 03C,41Ni,16Cr,l. 6Ti,2. 9Nb) is studied. The results show that with the increase of the solid solution treatment time (1 ~3 h) , the grain size of the alloy will be affected to a certain extent, thereby affecting the properties of the alloy； with the increase of the stabilizing treatment time (2. 5 ~5 h) , the precipitation of η increases, which leads to the reduction of strengthening phase forming elements, strength, plasticity and toughess of the alloy. Increasing the time of primary (8 ~18 h) and (8 ~36 h) secondary aging treatment will promote the precipitation of γ" and γ’ , and their morphology will also change, which will affect the properties of the alloy. But with solid solution for 1 ~3 h, stabilizing for 2. 5 ~5 h, primary aging for 8 ~18 h, secondary aging for 8 -36 h, the alloy mechanical properties all meet requirement of standard.3|0|0更新时间：2026-01-21
- 摘要：The microstructure, texture and electromagnetic properties of high-grade cold-rolled 50W300 non oriented electrical steel 2. 3 mm hot-rolled plate with normalizing at low temperature ( 820°C ) and high temperature (920 X.) are studied by means of EBSD ( electron back-scatting diffraction) detection etc analysis and magnetic property measurement technology. It is found that when the normalizing treated process is at 920 T for 2 min (45 m/min) , the iron loss of the finished electrical steel is the lowest and the magnetic induction is the highest. Under such process conditions, the grain structure of the outer layer of the electrical steel coil is rapidly decarburized. The grain growth of the subsurface layer is slow, and the grain is small and uniform. When the center layer structure is recrystallized, they are uniform in size. And the texture level reduces, the surface texture is slow, the texture in sub-surface and the central layer are similar to the cold- rolled textures, the texture ratio of the magnetic properties of electrical steel increase.关键词：无取向电工钢50W300, 2.3 mm热轧板, 常化, 组织,织构,磁性能4|0|0更新时间：2026-01-21
- 摘要：NM360-YLJ wear-resistant steel for press vibrating wheel of 360 degree roll pressing round-formed roller was designed. The results show that the optimum austenitizing temperature of steel is 870 ~910 T , carbides precipitated in multiple habitual directions are distributed on the martensite lath with a width of about 15 ~ 50 mm and a length of about 60-110mm, there are several large angle grain boundary structures in quenched martensite lath bundles, and the orientation difference distribution is mainly in 60° with martensite proportion 63. 5% ~ 66. 9% and martensite width 0. 08 ~ 6.6 μm. The properties of steel are yield strength 980 〜1 000 MPa, tensile strength 1 182 〜1 198 MPa, elongation 22% ~25% , surface vickers hardness value 363 ~379HV and low temperature impact energy at -40°C 160 to 175 J, better strength-toughess matching and roll pressing formed performance is obtained.2|0|0更新时间：2026-01-21
- 摘要：Effect of quenching and tempering process on the microstructure and mechanical properties of 40CrNiMoA steel welded joints was studied in this paper. The test results indicated that by quenching + tempering at 830 ~ 870 °C + 550 - 650 °C the 40CrNiMoA steel 3 nun plate at 90A 10V welded joint hardness difference between weld zone, heat affected zone, and base metal zone is reduced significantly, and tempered sorbite structure is formed. The higher quenching and tempering temperature, the more uniform microstructure among the weld zone, heat affected zone and base metal of welded joint, and the cementite particle grew up in structure. The 40CrNiMoA steel welded joint after oil quenching at 850°C and tempering at 600 勾 has higher strength (905 MPa) and plasticity (13. 5% ). In this case, the comprehensive mechanical properties are best.2|0|0更新时间：2026-01-21
- 摘要：The tested 00Crl8Nil0N steel (/% ：0. 018C,0.41Si, 1. 68Mn, 18. 18Cr, 10. 38Ni,0. 16N) is melted by 1 t EAF-AOD-ESR process, forged to Φ30 mm bar and solid-solution-treated at 1 050℃ . The axial high-cycle fatigue properties of 00Crl8Nil0N steel with two stress-concentration coefficients (SCs) ( smooth: Kt= 1, notch:Kt=3 ) at 200 ~ 600 ℃. are studied. The fatigue S-N curve is obtained, the fatigue limits of two SCs are calculated and the typical fracture morphologies of fatigue specimens are observed by SEM. The results show that fatigue limits of the smooth specimens decrease with increasing of test temperature, and the fatigue limits of the notch specimens are not sensitive to the change of test temperature. When SCs rises from Kt=1 to Kt= 3, the 107cycles fatigue limits of 00Crl8Nil0N steel at 200 , 400, and 600 ℃ decreases respectively from 530、506、410 MPa to 323、370、392 MPa. It shows that the 00Crl8Ni10N steel has obvious fatigue limit stress concentration sensitivity at elevated temperatures, and the stress concentration sensitivity decreases with increasing of test temperature. The fracture of the fatigue specimen is composed of three parts： the fatigue source zone, the fatigue crack propagation zone and the instant fracture zone. The fatigue originates from the discontinuous positions of the surface machined tool marks and exhibits a ductile-fracture characteristic.2|0|0更新时间：2026-01-21
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