最新刊期
卷 42 ， 期 4 ， 2021
- 摘要：Low carbon steel-high silicon electrical steel-low carbon steel three layers composite plate prepared by cladding cast has been deformed by process of hot rolling and warm rolling. The formation and evolution of cracks during the plastic process are investigated, and the effect of diffusion annealing on variation of cracks in deforming process is studied. Results show that ingot of composite could be thinned by hot rolling and warm rolling from 60 mm to 0.5 mm. The deep cracks in high silicon electrical steel generated during plastic deformation process are not affected by the processing technique essentially and their own existence attribute will always be retained in inner layer of the composite. The ordinary cracks produced in the deformation process are greatly affected by the deformed process, and the size decreases obviously. The microcracks generated in the alloy matrix around the deep crack and ordinary crack during the plastic process can be eliminated in the diffusion annealing process.关键词：低碳钢-高硅电工钢复合板;裂纹;热轧;温轧;扩散退火5|0|0更新时间：2026-01-21
- 摘要：The short-term (4 h) high-temperature oxidation behavior of 444Nb and 444NbTi stainless steel at 1100℃ is investigated by X-ray Diffraction,Scan Electron Microscopy and Energy Dispersive Spectrometer to analyze the phase, microscopic morphology and chemical composition distribution of the oxide film. The results show that the oxidation weight gain per cm2of the 444NbTi steel is twice that of the 444Nb steel, which is related to the Ti changing the defect structure of the Cr2O3oxide film. Spallation of oxide film happens to the 444Nb steel sample,it may be that the rapid diffusion of Mn promotes the diffusion of Nb to the interface between oxide film and metal matrix, and the formation of endogenous Nb oxide increases the internal stress and thermal stress of steel. There is a dendritic matrix in the oxide film of the 444NbTi steel sample,which increases the interfacial strength,and the Ti and Al undergo obvious internal oxidation.关键词：444Nb and 444NbTi Ultra-Pure Ferritic Stainless Steel;High Temperature Oxidation;Spallation of Oxide Film;Diffusion;Internal Oxidation2|0|0更新时间：2026-01-21
- 摘要：Through single pass and two pass thermal simulation experiment, the rolling process in recrystallization zone with deformation 20% ~ 50% at deformation temperature 980,1 000,1 020 °C , and with different deformation 25%~40% at 1000°C ,and interval time (1~20 s) after deformed at 1000°C is studied. And the affect of deformation process interval time, deformation temperature and deformation quantity on grain size, cleavage unit size and texture are characterized and analyzed through metallographic examination, EBSD ( Electron Backscattering Diffraction) and X-ray deffraction (XRD). The results show that microstructure grain size and cleavage unit size greatly refine with recrystallization interval time decreasing, deformation temperature decreasing in recrystallization zone and deformation increasing. When deformation temperature decreases to 980°C，more{110} glide plane can be obtained, thereby increasing toughness.关键词：再结晶区;变形间隔时间;变形温度;变形量;组织织构3|0|0更新时间：2026-01-21
- 摘要：Nb and Si diffusing rule at 1 190℃ in GH2907 (0.02C,38,20Ni,13.92Co,4. 92Nb,l. 60Ti,0.32Si) alloy ϕ508 mm 3 t ingot is studied by using optical microscope, scanning electron microscope etc. Studies have shown that the dendrite spacing of the GH2907 alloy ϕ508 mm ingot is approximately 110μm, the apparent diffusion coefficients of Nb and Si at 1190℃ are respectively D = (0.704 ±0.041) X 10-14m2/s and D = (1. 870 ±0.511) x 10-14m2/s. Theoretical calculation shows that,when Nb diffuses 44.8 ~50.3 h or Si diffuses 14.0~24.5 h at 1 190℃,the residual segregation index δiwill reach 0.02 respectively.关键词：GH2907合金;1190℃扩散;表观扩散系数;偏析2|0|0更新时间：2026-01-21
- 摘要：The cracking formation factors of steel 430F rolled bar are analyzed by scanning electron microscope, ultra- high temperature laser confocal microscope, Gleeble-3500 and other experimental equipment combined with professional image processing software, the modification effect and mechanism of each element and the high temperature mechanical properties. The results show that the control of MnS morphology in 430F steel is poor, and the tiny crack caused by long strip MnS is the main reason for cracking. Fine MnS ・ Al2O3• MgO is formed by magnesium modification and coarse MnS • (Te) is formed by tellurium modification to obviously improve the morphology of MnS, no cracks were found in the rolled products. The reduction of area of steel 430F changes obviously at high temperature, while the tensile strength changes significantly at low temperature, therefore, with increasing the starting rolling temperature of unmodified steel from 1180 °C to 1 200 ~ 1210 P and reducing the final rolling temperature from 1000 °C to 970 ~ 980 °C , the yield of products can increases from 85% to 95%.关键词：430F高硫易切削不锈钢;MnS改质;轧制参数;成材率2|0|0更新时间：2026-01-21
- 摘要：The 250 mm x 250 mm rolled billets of high-speed railway axle steel DZ2 are rolled, by EAF-LF-VD-ϕ690 mm cast bloom and EAF-LF-VD-ϕ690 mm cast bloom-ϕ740 mm ESR ingot of two processes. The macrostructure, inclusions ,carbon segregation, microstructure and mechanical properties of the blooms are studied. The results show that: compared with EAF process flowsheet, the rating of central porosity and general porosity of DZ2 steel shaft billet obtained by ESR process reduces from 0.5 ~ 1.0 to 0 ~ 0.5 grade； the size range of inclusions reduces from 2.43 ~ 25. 05μm to 1. 42 ~ 9. 32μm, and the morphology of inclusion changes from rod-shaped to spherical； the carbon content distribution on cross-section reduces from 0.256% ~ 0.269% to 0.261 % ~ 0.265% , and the carbon range difference reduces from 0.013% to 0.004% ; the yield strength and tensile strength increase by 17.5% and 13.8% , respectively, and the transverse and longitudinal impact energy at 20℃. increase by 36.2% and 17.8% , respectively.关键词：高速车轴钢DZ2;EAF-LF-VD-CC;电渣重熔;夹杂物;碳偏析;力学性能5|0|0更新时间：2026-01-21
- 摘要：Analysis results show that the center segregation of continuous casting billet is serious, easy to cause cup and cone fracture when the rod is drawn； the non-metallic inclusions in the wire rod cause the wire fracture due to the stress when the wire rod is pulled out and twisted; if the content of O and N in steel is too high, the strength and hardness of steel will increase, and the toughness will decrease； reasonable coiling temperature and cooling rate can ensure the ideal micro structure o£ the wire rod. By controlling [O]≤20 X 10-6N]≤40 X 10-6costing liquid superheating ≤25℃,, rolling billet heating at 1100~1170 ℃ and coiling at 910~93O℃ etc process measures the drawing fracture is avoided.13|4|0更新时间：2026-01-21
- 摘要：The effects of soft reduction (0 ~ 8 mm) and casting speed (0.42 ~ 0.49 m/min) of cast bloom on macrostructure and segregation of 42CrMo steel Φ195 mm rolled product are tested. The results show at present process condition that when the superheat degree of 42CrMo steel is controlled at 20 ~ 30℃ with secondary cooling specific water content 0.3 L/kg, mold and end electromagnetic stirring 100 A/l.5 Hz and 400 A/8 Hz, the casting speed 0. 49 m/min and the total soft reduction 6 ~ 8 mm, the internal quality of 42CrMo steel rolled product can be efiectively improved.关键词：42CrMo钢;中心疏松;中心偏析;轻压下;拉速2|0|0更新时间：2026-01-21
- 摘要：The mechanism of surface longitudinal cracks of 200 mm x 1 260 mm cast slab of 1.5% ~ 2.5% Al steel 20Mn23AlV has been studied. The results show that the surface longitudinal crack of steel 20Mn23AlV cast slab is related to the denaturation of mold flux. The mold flux added 5.49% Li2O can greatly improve the stability of the physical and chemical indexes of the mold flux during the casting process, and it is favourable to reduce the occurrence probability of cast slab longitudinal surface crack from 23.8% to below 0.3% .关键词：铸坯;纵裂;保护渣变性;高铝钢20Mn23AlV2|0|0更新时间：2026-01-21
- 摘要：When producing GCr15 bearing steel ϕ50 ~75 mm bar,there is center porosity in rolled bar. A numerical simulation is carried out to study the penetration of effective strain in the core of bar and optimize the rough rolling pass technology, increase the reduction of the first two passes from original 21 mm and 58 mm to 51 mm and 85 mm respectively, and reduce the third pass from 60 mm to 34 mm. Through the effective strain value gradually increases with the increase of the pass,the tensile stress in the bar becomes compressive stress after the optimized process,and the uniformity of deformation is also obtained to promote the deformation of core of casting slab be available to the closure of the center porosity. After the process optimization,the qualified rate by ultrasonic detection of bearing steel increases from original 93.25% to 96.06%.关键词：GCr15钢;粗轧;数值模拟;等效应变;中心疏松2|0|0更新时间：2026-01-21
- 摘要：The Q195 steel is produced by M120 t BOF→LF→Ca addition→160 mm x 160 mm CC” process. It was found by tracing test that the number of ≥27μm large size inclusions at test area 50 x 400 mm2in the billet is 31 and generated by LF top slag entrapped during gas stirring, calcium treatment formed CaS, submerged entry nozzle material stripped and formed endogenous large size calcium-aluminate inclusion in steel as the flow rate of argon is in the range of 300～600 L/min. The proportion of LF top slag entrapped is about 29. 1% in all the large size inclusions. As the flow rate of argon decreases from 300～600 L/min to 100 L/min, it is found that the LF top slag entrapped could be significantly decreased ,at some test area the ≥27μm inclusions number decreases to 19.关键词：120 t LF;大尺寸夹杂物;精炼渣卷渣;氩气搅拌强度2|0|0更新时间：2026-01-21
- 摘要：The measures as applying the process of Si-Ca deoxidation, controlling the total content of oxygen in the EAF molten steel and the content of Al2O3in LF slag,Control refining time ≥40 min,vacuum degassing(VD),control soft blow time ≥20 min, and protecting cast to prevent secondary oxidation of the molten steel and promote the floating o£ inclusions in the steel are adopted at Hengsteel. The number and size of Grade B inclusion Al2O3in the molten steel are reduced to improve the cleanliness of steel. Production practice shows that controlling steel [Al]s≤0.004% ,T[O] ≤0.0020% , refined final slag (FeO) ≤0.8% and alkalinity (R) between 2.0 and 3.2 in liquid of hydraulic cylinder steel are available to control Grade B inclusion. Grade B inclusions not exceeding class 1.0 is beneficial to control the production of " white spots" in the SRB process.关键词：100t EBT-LF-VD-CC;油缸;硅钙脱氧;夹杂物2|0|0更新时间：2026-01-21
- 摘要：The edge crack cause of 309L austenitic stainless steel plate in the hot rolling is analyzed by means of metallographic structure observation and thermodynamic calculation. Results test show that the hot rolling temperature of steel plate 309L (0.012% C ,0.034% N) is at 1 260℃：and large area of continuous reticular δ ferrite exists in the triangle area of slab edge. In the subsequent heating process, the ferrite content increased continuously to up 24% , which lead to the decrease of plasticity and formation o£ edge crack in rolling process. By controlling 0.015% ~ 0.025% C, and 0.04% ~ 0.05% N in steel, and slab heating at 1 150 ℃ ,the ferrite content in steel decreases to 10.7% to be available to avoid the edge crack of 309L steel plate and coil qualified rate up to 100%.关键词：309L奥氏体不锈钢板;边裂;高温铁素体;热塑性2|0|0更新时间：2026-01-21
- 摘要：Change rule the microstructure evolution and mechanical properties of 55NiCrMoV7 die steel under different quenching temperature (790~910°C) , and tempering temperature (100 ~650°C ) are studied by means of scanning electron microscopy (SEM) , hardness test, V-impact test, uniaxial tensile test combined with finite element modeling and simulation. The results show that, with the increase of quenching temperature, spherical caibide gradually dissolves into martensite matrix, martensite structure grows and coarsens, and residual austenite increases gradually； after quenching, the HRC hardness value is basically stable at 42 ~ 46, and the yield and tensile strength first increase and then decrease, reaching a maximum of 1380 MPa and 1485 MPa after quenching at 870 °C ,and the maximum value of impact toughness is 26 J after quenching at 850 °C. In different temperature tempering process, the content of martensite structure basically stable, with the increase o£ tempering temperature, the retained austenite gradually disappears, fine and dispersed carbides begin to precipitate at the boundary of martensite. Quenching at 870°C 4 h and tempering at 560°C 6 h can make 55NiCrMoV7 steel to have good comprehensive mechanical properties.关键词：55NiCrMoV7钢;微观组织;力学性能;模型2|0|0更新时间：2026-01-21
- 摘要：The influence of structure evolution and defects of 304H stainless steel wire during the cold drawing process from Φ2.6 mm to Φ0.89 mm on torsion performance of stainless steel wire are studied. The results show that when the true cold drawing strain of the steel wire is between 0 and 1.39 ,the torsion performance decreases sharply and the number o£ torsion decreases ； when the true cold drawing strain is between 1.39 and 2. 14, the torsion performance gradually rises and the number of torsion increases. With the application of strain,work hardening leads to the deterioration of plastic toughness by dislocation plugging, which is the main factor for the decrease of torsional performance, and the increase in the content of {111} //ND texture at this stage is also not conducible to the torsional performance；as the strain is further increased,and the internal grains of steel wire are refined into ultra-fine grains,leading to further increase in strength and recovery of plastic toughness,which are the main factors for the rebound of torsion performance,and the decrease of {111}//ND texture content is also available to torsion performance. However,when the true cold drawing strain exceeds 1.39,the average areal density of inclusions also increases,which hinders the further recovery of the torsional performance of the steel wire.关键词：304H不锈钢;扭转性能;晶粒取向;晶粒尺寸;夹杂物2|0|0更新时间：2026-01-21
- 摘要：The change influence of 6.9% and 13.6% two austenite contents and 0 ~ 20% pre-strain process on mechanical properties of medium manganese steel 5 mm plate is analyzed by the test method of 610℃ 5 h furnace cooling and 800℃ 20 min W. C. +625 ℃ 12 h A. C. two heat treatment and 0 ~20% pre-strain process. The amount of retained austenite in the steel is determined by X-ray diffraction analysis and its mechanical properties are measured by tensile test. Research results show that at the same pre-strain level,compared to the sample with 6.9% austenite volume fraction,the sample with 13.6% austenite volume fraction has lower yield strength by about 30 MPa,higher tensile strength about 40 MPa,lower yield strength ratio by about 0.1,higher total elongation by about 7 percentage point,and more obvious work hardening behavior. At the same austenite content,with the increasing of pre-strain,the yield strength,tensile strength and yield-strength ratio increase,the total elongation decreases. With the increasing of true strain,the work hardening behavior can be divided into four stages:decreasing (stage I) increasing (stage II) ,almost unchanged (stage III) and decreasing (stage IV).关键词：0.1C-4.98Mn中锰钢;预应变量;奥氏体;力学性能;加工硬化行为4|0|0更新时间：2026-01-21
- 摘要：Based on the hardness and microstructure of the primary cold-rolled sheet of oriented silicon steel 27Q110 recrystallization temperature annealing test, the optimal annealing temperature of decarburization annealing (primary recrystallization) of oriented silicon is determined to be 850 °C. The microstructure and texture of the oriented silicon steel 27Q110 produced at cold rolling works after decarburization annealing are detected and analyzed. Be results show that the optimum annealing temperature of decarburization of oriented silicon steel 27Q110 is 850°C,and the main γ texture is the strongest at {111}<112> .关键词：取向硅钢27Q110;再结晶;显微组织;铁损值2|0|0更新时间：2026-01-21
- 摘要：The comprehensive properties of ferrite stainless steel Y0Cr17SiS are poor in hot rolling state, which can not meet the requirements of processing and application, so it is needed to annealing treatment. The effects of annealing temperature of 750 ℃ ,800 ℃ ,850 ℃ and 900 ℃ on the microstructure and properties of Oil mm hot-rolled products of steel Y0Cr17SiS are studied. Results show that with 900 °C 2 h,air cooling annealing,the steel Y0Cr17SiS has uniform structure with out precipitates,its tensile strength is 510 MPa,elongation after fracture is 36% ,reduction of area is 65% ,and HBW hardness value is 171. It could maintain no rust for 24 h by salt corrosion fog test with 5% NaCl aqueous solution at 35 °C.关键词：铁素体不锈钢Y0Cr17SiS;退火;组织;析出相;力学性能;耐蚀性2|0|0更新时间：2026-01-21
- 摘要：The band structure in 42CrMoA hot rolled steel is observed and analyzed by scanning electron microscope (SEM) and energy dispersive spectrum (EDS). The results show that there is a serious band structure in the hot rolled structure of 42CrMoA steel and a second type of band structure such as bainite except ferrite, and the band structure is 3 rating. EDS line scan shows that segregated C and Cr elements seriously among dendrites, which is the main reason for the formation of banded structure. By controlling measure of the superheat of the molten steel in the continuous casting tundish 20 ~30℃. ,the casting speed of 0.75 m/min,the electromagnetic stirring parameter 400 A 8 Hz,and the specific water volume of the secondary cooling decreasing from 0.30 L/kg to 0.25 L/kg and end rolling temperature decreasing from 950 ℃ to 910 ℃ ,the steel banded structure decreases from 3 rating to ≤2 rating.关键词：42CrMoA钢;带状组织;枝晶偏析;改善措施2|0|0更新时间：2026-01-21
- 摘要：Effect of 0.78~0.92% Mn on structure and mechanical properties of ϕ20 mm hot-rolled coil of 0.20% carbon cold-heading steel has been analyzed and studied. End-rolling temperature of hot-rolling coil is 880 ℃,slow-cooling. Results show that with increasing Mn in steel from 0.78% to 0.92% ,the tensile strength of coil increases from 485 MPa to 508 MPa,i. e. that increases by 23 MPa；the elongation decreases from 31% to 28% ,i. e. decreases by 3 point of percentage, and the reduction of area decreases from 58% to 52% ,i. e. decreases by 6 point of percentage； the HRB hardness value increases by 4.5. The size of ferrite groups in structure of test steel reduces from 28μm to 18μm，the pearlite content in structure increases form 23% to 26% and the pearlite lamellar spacing decreases slightly;the hardenability of steel improves.关键词：Mn含量;低碳冷镦钢SWRCH22A;热轧盘条;组织;力学性能7|0|0更新时间：2026-01-21
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