最新刊期
卷 40 ， 期 3 ， 2019
- 摘要：By measuring the dilatometric curves of 15MnVB steel with cooling speed 0.05 ~20 ℃/s on Gleeble-1500 thermo-mechanical simulator, and combining with metallographic analysis, a CCT diagram of hot deformed austenite in continuous cooling transformation was obtained, and the products microstructure and hardness of the continuous cooling transformation occurring in steel 15MnVB was investigated. The results show that the microstructure of the steel consists of ferrite + pearlite,ferrite + pearlite + bainite,ferrite + pearlite + bainite + martensite and bainite + martensite at the cooling rate from 0.05℃/s to 20 ℃/s.关键词：15MnVB钢;铸坯;热模拟;CCT曲线2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of test steel T91 (/% :0.10C,0.30Si,0.45Mn,0.012P,0.005S, 8.90Cr, 0.95Mo ,0.08Nb ,0.22V) is 60 t UHP EAF-AOD-LF-VD-240 mm x 240 mm bloom casting- heating and continuous rolling. The examination results of macrostructure of unqualified steel T91 Φ90 mm products by ultrasonic flaw detection show that there are center cracks and hole in bar,by metallographic analysis it is obtained that the defects have three characteristics： (1) overheating hole and cracks； (2) axial intercrystalline cracks its source at casting bloom and (3) shrinkage cavity. With the technology measures including optimizing the casting I、U and HI zone secondary cooling water amount respectively from original 28、31 and 17 L/min to 15、18 and 10 L/min,and controlling the casting bloom heating temperature ,the equiaxial crystal ratio in casting bloom center increases from original 14% to more than 25% ,the rating of central cracks decreases from original 2.0 to less than 0. 5 ,and the unqualified ratio of steel T91 products by ultrasonic flaw detection decreases from original 5% to less than 0.2%.关键词：T91钢;60 t UHP EAF-AOD-LF-VD-CC流程;超声波探伤;中心裂纹;轴心晶间裂纹;二冷水2|0|0更新时间：2026-01-21
- 摘要：The variations of the total oxygen content, the amount, size and morphology of inclusions in three heats 0. 6% C steels were studied systematically by sampling of molten steel and slag during LF refining and continuous casting. The results show that the total oxygen content of three heats 0. 6% C steel is about 0.007 0% in start of LF refining, the total oxygen content of three heats 0.6% C steel is reduced slowly and the total oxygen content in the casting blank is reduced to less than 0. 003% during start of LF refining→ after calcium treatment→end of soft argon stirring→ tundish casting→ casting slab. In start of LF refining, the inclusions of three heats 0. 6% C steel are mainly SiO2-MnO-(Al203) inclusions, which are the deoxidized products of silicon and manganese. After calcium treatment, the inclusions in the steel are transformed into CaO-SiO2 -Al2O3-MgO whose main components are CaO + MgO 20% ~40% , SiO2 20% ~40% , Al2O330% ~50%. Due to the secondary oxidation of molten steel during tundish pouring, the total oxygen content of molten steel and the a¬mount of SiO2-MnO-( Al2O3) of the secondary oxidation products in 0. 6% C steel tundish have increased significantly.2|0|0更新时间：2026-01-21
- 摘要：Based on the analysis of the equilibrium calculation results of the converter steelmaking process, the measures to increase the scrap ratio are obtained that are reducing slag, reducing the amount of coolant and adding heating agent. The results show that,the scrap ratio can be increased by 0- 10% by reduce 1 kg/t slag,0. 19% by reduced 1 kg/t coolant, 0.27% by adding 1kg/t anthracite,and 0. 41% by adding 1kg/t clean heat agent, and the scrap ratio can be increased from 17.0% to 23. 1 % by optimized the process.6|0|0更新时间：2026-01-21
- 摘要：The structure of enameling water tank is upgraded from three-segment type to two-segment type. The manufacturing process of water tank is changed from sheet curling and stamping craft to the sheet deep drawing craft. Because of the structure change of water tank, there are much more requirements on enameling property and formability for steel sheet. Baosteel industrial data and Design of Experiments ( DOE) method are used to establish the steel designing and optimizing model, and the special deep drawing hot-rolled steel for enameling water tank is developed successfully. It has been proved by large industrial production that, the reject ratio of deep drawing parts can be controlled down the level of 0. 4% , at the same time, the enameling property is excellent.关键词：搪瓷内胆;深拉成形;热轧钢带;DOE(试验设计)2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of Φ13 mm 55SiCrA-l steel (0.55% C) is desulphurized metal-80 t BOF-LF- RH-280 mm x325 mm bloom casting- rolling. The abnormal fracture of produced 613 mm 55SiCrA-l steel occurs during cold-drawn process, and the metallographic analysis results show that there are obvious black spots in center of coil and the negative segregation occurs at the zone near center. With the process measures including optimizing liquid overheating extent (15 ~25 ℃) , secondary water ratio (0.25 L/kg), mold electromagnetic stirring current (300 A) and light reduction amount ( roller I- 1 mm, Ⅱ- 2.5 mm, Ⅲ - 3.5 mm, Ⅳ- 3. 5 mm and V-2 mm) , the distribution of carbon at cross section of casting bloom tends to uniform i. e. the carbon content range decreases from original 0.49% ~0. 63% to 0.52% ~ 0.60% , and the cold-drawn fracture ratio decreases form original 7% to 0. 5%.3|0|0更新时间：2026-01-21
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Practice of Steel 18CrNiMo7-6 Bloom by Process of 120 t BOF-LF-RH-410 mm x 530 mm Continuous Casting
摘要：The steel grade 18CrNiMo7-6 with diameter of Φ115 ~250 nun round from process route of hot metal + scrap-120 t BOF-RH- 410 mm x530 mm continuous casting-bloom heating by walking forward heating fumace-750 rolling¬annealing. Its chemical composition is (/% : 0. 15 ~ 0. 19C, 0. 25 ~ 0. 40Si, 0. 40 ~ 0. 60Mn, 1.50 ~ 1. 80Cr, 1.40 ~ 1.70Ni, 0.25 ~0. 35Mo, W0. 020P, W0. 020S,0.020 ~ 0. 040Al, 0.0100 ~ 0.0200N). Through deoxidization and alloy addition during tapping, deep vacuum degassing not less than 15 minutes, soft bubbling with Nitrogen, super heat control in tundish, casting speed of 0. 48 m/min, full process argon protection and applications of F-EMS and M-EMS, annealing after rolling etc. , the final product's macro-inclusion not more than 20 mm/dm3carbon center segregation not more than 1. 10 and grain size finer than 7, which meet the specification requirements.关键词： 410 mm x 530 mm连铸坯, 18CrNiMo7-6钢;宏观夹杂物;晶粒度2|0|0更新时间：2026-01-21 -
Effect of Control Rolling and Cooling on Hardness of Steel 38CrMoAl Coil and Optimization of Process
摘要：The production process of Φ8 ~20 mm coil of steel 38CrMoAl (/% : 0.35 ~0.42C, 0.20 ~ 0.45Si, 0.30 ~0.60Mn, ≤ 0.035P, ≤ 0.035S, 1.35 ~ 1.65Cr, 0.15 〜0.25Mo, 0.70 〜1.l0Alt) is 90 t converter-LF-VD-150 mm X 150 mm billet casting-continuous rolling. The effect of chemical composition, rolling temperature and cooling speed on structure of steel 38CrMoAl has been analyzed. With decreasing the billet heating temperature, beginning rolling temperature and coil laying-off temperature respectively from (1100±40)℃, (1 020 ± 20 )℃ and ( 900 土 15)℃ to (1 060 ± 40)℃,(980 ±20)℃ and (840 ± 15)℃ , the HB hardness scale of coil decreases from 284 〜353 to 221 〜254 obviously to decrease the wire breakage rate in cold drawing process of coil.2|0|0更新时间：2026-01-21 - 摘要：Xinggang one-step method (dephosphorization station +60 t AOD furnace +60 t LF furnace) is used in the production of 400 series free cutting stainless steel, in the early stage, in all the sulphur iron was added to the steel in the AOD to fit [S]. The alkalinity of steel slag during the AOD tapping to the upper casting process is always in the low alkalinity range (R = 1.40 ~ 1.95). The consumption of sulphur iron is large, oxygen content in molten steel is high, with the increase of the number of smelting furnaces, the lining erosion is serious, effecting AOD furnace life and billet quality and the steel slag is in a low alkalinity state for a long time, which is easy to cause the increase of [C] content in the steel (especially 430F, 430FR low carbon steel) , which is difficult to achieve multi-furnace continuous pouring. In the later stage, by optimizing the method of adding iron sulphide and the alkalinity of slag at different stages, including iron sulphide in LF late period, AOD slag basicity 2.0 ~ 2.3 and LF slag basicity 1.6 ~ 2.0, the treatment time of low alkalinity slag is shortened, the [S] element loss and the oxygen content of molten steel and the erosion of the furnace lining are reduced. The sulfur element absorption rate was increased from 62% to 75% , the sulphur iron consumption per ton of steel decreased by 2.12 kg, and defects such as subcutaneous bubbles in the slab were controlled.2|0|0更新时间：2026-01-21
- 摘要：The design idea of light-weighting with medium and high carbon components and low density elements Si and Al was adopted,and the tested high-strength armored steel was melted by a 50 kg vacuum induction. At the same time, the metallographic microstructure and pearlite lamellar spacing and mechanical property of the 06 mm wire rod were tested by means of metallographic microscope,SEM scanning electron microscopy and mechanical property testing equipment,The results show that the microstructure of the wire rod after isothermal heat treatment(600 °C insulation for 2 hours) is ferrite and pearlite mixed microstructure. The pearlite lamellar spacing is (126 ±5) nm, the yield strength is greater than 1183 MPa,the tensile strength is greater than 1 425 MPa and the elongation is greater than 10%. The mechanical properties of test steels meet the technical requirements of armoured steel for electric cables.2|0|0更新时间：2026-01-21
- 摘要：The effect of quenching temperatures on microstructure and mechanical properties of 780 MPa grade hydroelectric steel(/% ：0. 09C,0. 10Si,l.50Mn,0.009P,0.002S,0. 90Cr,0.20Ni,0.023Ti,0.004Nb,0.0010B) was investigated. The results showed that the tested steel can transform into lath bainite microstructure when the steel was quenched at different temperatures, and the average grain size of prior austenite grows from 9.1 μm to 16.6 μm with increasing quenching temperature from 910 °C to 950°C , the microstructure of the tested steel after tempering is basically maintained a lath structure after quenching. When the quenching temperature is between 910 °C and 950°C ,with increasing quenching temperature ,the strength of the tested steel increases firstly then decreases and the maximum value reaches at 930 °C ,and variation of the impact toughness and elongation of tested steel are identical compared with the strength. The optimum mechanical properties are obtained when quenching at 930°C. and tempering at 610 °C , the yield strength is 802 MPa, tensile strength 858 MPa and elongation 19% with the Charpy impact energy 238 J at -40 °C .关键词：Ti-Nb-B微合金化;淬火温度;水电用钢;组织;力学性能9|0|0更新时间：2026-01-21
- 摘要：Tested steels are melting by a 50 kg medium induction furnace and rolling to 13 mm plate. The effect of rolling temperature (1 010 ~ 1 050 ℃) of tested steel 0.15Mo,R2- 0.15MoV, R3- 0.35MoNbV, R4- 0.35MoNbVB and R5- 0.35MoNbVTiB on properties of the steels has been tested. Results show that the R3 steel (/% : 0.04C,l. 12Mn, 0.32Si,0.018P,0.023S,0. 35Cr,0.35Mo,0.025Nb,0.15V) rolled at 1 030 T has excellent comprehensive properties i. e. tensile strength 598 MPa,yield strength 514 MPa,elongation 28% ,ratio of yield-tensile strength 0. 86,the HV hardness scale before and after tempering at the temperature of 600 ℃ respectively being 215 and 204, and impact energy of steel at 0 ℃ being 124 J,and the yield strength of steel at 600 ℃ being 355 MPa with ratio of yield-tensile strength 0. 69 to meet the requirement of state standard for fire-resistant steel.关键词：Nb-V微合金化;钼;建筑;耐火钢;组织;力学性能3|0|0更新时间：2026-01-21
- 摘要：The composition, corrosion resistance and application of normal and super duplex stainless steels have been summarized, and different kinds of precipitated phases, harmful phases, pitting resistant equivalent (PRE) and effect of welding on structure and properties of duplex stainless steel are analyzed. It is obtained that with controlling alloy chemical composition adjusting pitting resistant equivalent value ； scheduling reasonable heat treatment process to control the precipitation of harmful phases and the ratio of dual phase content near to 1 ,it is able to get better corrosion, higher strength and wear-resistant duplex stainless steel.3|0|0更新时间：2026-01-21
- 摘要：A Nb-V Microalloyed Cu-Bearing high strength weathering steel (/% : ≤ 0.12C, ≤ 0. 40Si, ≤ l. 40Mn, ≤ 0.020P, ≤ 0. 010S, 0.40 ~0.45Cr, 0.25 ~0.35Cu, ≥ 0.020Al, 0.02 ~0.03Nb, 0.02 ~0.03V) with excellent comprehensive performance was developed by means of proper composition design and thermo mechanical control process ( TMCP), and its corrosion resistance was studied. The microstructure of the high strength weathering steel was composed of ferrite, pearlite and bainite, whose tensile strength reached 697 MPa, yield ratio was 0. 73, elongation was 24. 6% , and -40 ℃ longitudinal impact energy was 70. 6 J. The results of salt spray test and periodical immersed corrosion test indicted that the corrosion resistance of test steel was obviously better than Q345B, and the test steels rust layer after salt spray test by XRD analysis was mainly composed of Fe3O4α-FeO( OH) and -γ-FeO( OH) , and the relative content of Fe3O4increased with time, α-FeO(OH) changed slightly, γ-FeO(OH) decreased.2|0|0更新时间：2026-01-21
- 摘要：The steelmaking process of tested steel Q345E (/% ：0.13C,0.23Si, 1.45Mn,0.012P,0. 005S,0.045V, 0.030Nb,0.030Al) is 100 t EAF- LF- VD- Φ500mm bloom casting-Φ140mm bar rolling. By heat treatment test of steel Q345E,it is obtained that the effect of grain size rating on impact energy of tested steel at -40°C is obvious,as the rating of grain size of products is 7.0,the impact energy of steel at -40°C is only 12 ~ 16 J,and as the rating of grain size is 9.0 ~ 10.0,the impact energy of steel at -40°C. is increasing to 80 ~ 198 J. With decreasing finished rolling temperature from 960 °C to 865 ~910 °C,the rating of grain size of steel products increases from 7.0 to 8.5 ~9.0 and the impact energy of steel at -40°C increases from 12 ~ 16 J to 61 ~ 82 J to meet the standard requirement of impact energy 34 J of steel at -40 °C.关键词：Q345E钢;Φ140 mm棒材;-40 °C冲击功;晶粒度;控轧控冷2|0|0更新时间：2026-01-21
- 摘要：To study the effect of ausforming on hardenability in steel 09MnNb used for L485QS sour service pipeline, different ausforming processes were performed and the subsequent hardenabilitis and microstructures were tested. It revels that three types of microstructures could be gained when ausforming at temperature from 850°C to 1 100 °C and under deformation degree e from 0.2 to 0. 8. In the transformation of microstructures,it was a leading role of the deformatiorm temperature that acicular ferrite, thin-strip bainite and thick-lath bainite were mainly obtained respectively when the temperatures at 900°C . and below,from 950 °C to 1000 °C and at 1050 °C or higher. Increasing deformation degrees could promote transformation of acicular ferrite in unrecrystallization zone and thin-strip bainite in partial recrystallization respectively ,but in fully recrystallization zone make the lath bainite either coarsed or refined. When ausforming used of steel 09MnNb at temperatures from 950 °C to 1000°C and under deformation degree of ε ≥0.4 or above,the microstructure consisted fully of thin-strip bainite could be obtained so as a higher and more stable hardenabilities could be achieved, which may be beneficial to the properties control when tempered in following.2|0|0更新时间：2026-01-21
- 摘要：The influence of the status of billet steel, rolling compression ratio, deformation rate per pass on grain of 316 austenitic stainless steel medium plate was done in laboratory. The results explained that the total compression ratio is more than 6, the original structure of steel billet has no influence on grain size of hot rolling plate, when the total compression ratio is more than 6, the homogeneous grain in the whole thickness is obtained in condition of same billet steel heating- up temperature and deformation rate per pass. But when the total compression ratio is more than 6, the 2 grade and 7 grade duplex grain are obtained even though the deformation rate per pass is more than 30% , and when the total compression ratio is less than 10% , the grain is heterogeneous even though the total compression ratio is big enough.2|0|0更新时间：2026-01-21
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