最新刊期
卷 30 ， 期 3 ， 2009
- 摘要：A water model with linear scale 1 ; 3. 27 for a 70 t ladle RH unit has been established by using flow rale methed to measure RH circulation rate. RH circulation rate of liquid steel in real process condition and effect of parameters such as blow rate in up-gas tube, inner diameter of orifice T blowing up-gas traveling path and dipping depth of leg on RH circulation rate were analyzed to get optimizing process parameters. The commercial test of a 70 t ladle RH degassing refining showed that with blow rate 1 200 L/min in up-gas tube and inner diameter 3 mm of orifice, average [0] of bearing steel decreased by 3 X 10-6as compared that with original process ； carbon content of extra-low carbon steel might decrease to less than 0. 002% and decarburization time obviously decreased as compared with that before optimization.关键词：RH精炼;水模型;循环流量;工艺优化4|0|0更新时间：2026-01-21
- 摘要：A model of Laval nozzle has been established by definite proportion according to oxygen nozzle used in actual production. With using commercial software Fluent 6. 2, k-£ model and coupling implicit expression solution, the a- daptability of different math models in nozzle was discussed, it was obtained the RNG k-£ model was better to simulate (he shock wave in nozzle. The distribution of flow field, Mach number and pressure in the Laval nozzle with different operating mode (Po=0. 11 ~ 1. 0 MPa) were analyzed, and obtained that inhibited pressure at inlet of nozzle affected flow condition in Laval nozzle but it didn't affect the flow mode at outlet of nozzle which depended on geometry structure of nozzle.关键词：Flow Field;Shock Wave;Oxygen Lance;Laval Nozzle;Numerical Simulation2|0|0更新时间：2026-01-21
- 摘要：Based on analogy theory, the physical behavior of inclusion in liquid steel of ladle with argon stirring lias been studied by using 1; 9 water model and the effect of gas injecting time 2 ~28 min and gas flow-rate ( 1. 19 ~4. 75) x 10-2m3with different bottom blowing position on inclusion removal was tested. Results showed that most of inclusions could be removed in 8 min with smaller gas flow-rate, but with larger gas flow-rate that was In 20 min and 16 min respectively by using central blowing mode and eccentric blowing mode; by using either central or eccentric blowing mode, with increasing gas flow-rate, the inclusion removal rate increased at beginning, then decreased, and there was an optimum gas flow-rate for removal inclusions: with smaller gas flow-rate, the inclusion removal effect with eccentric blowing mode was better than that with center blowing mode, while with larger gas flow-rale the effect was opposite.2|0|0更新时间：2026-01-21
- 摘要：Test low carbon boron steel ( % ：0. 13 〜0. 21C, 0. 000 5 〜0. 003 7B) and low carbon Nb-V microalloying boron steel ( % ：0. 18 〜0. 24C, 0-0. 033Nb, 0 〜0. 050V, 0. 000 5 〜0. 002 2B) were melted respectively by laboratory 50 kg vacuum induction furnace and carbon tube furnace, and the tensile specimen and notched delayed fracture specimen were turned from φ13 mm rolled-forged rod. The delayed fracture resistance of test steels water-quenched at 950 T and tempered at 200℃ is presented by delayed fracture strength ratio R =σn( delayed fracture strength) /σc( tensile strength). Results showed that the tensile strength of 0. 000 5% B steel microalloying with 0. 028% Nb and 0. 032% V was 1 480 MPa and its R value was 0. 665 which was higher than that of 40Cr steel and 35CrMo steel queched at 880 ℃ , oil cold + tempered at 400 ℃ (both σcwere respectively 1 460 MPa and 1 530 MPa, R value 0. 583 and 0. 556).关键词：低碳微合金化;高强度硼钢;延迟断裂2|0|0更新时间：2026-01-21
- 摘要：Precipitates in Nb-Ti microalloying ultra-low carbon bake hardening steel ( % : 0. 002C, 0. 01 ~0. 02Nb, 0. 01 ~0. 02Ti, 0. 002 8 ~0.004 2N) have been studied and expressions for solution C content in test steel were established by quantitative phase analysis. Results showed that increasing calculated value of solution C content, the bake hardening BH2value increased； with increasing annealing temperature (810 ~ 850 °C ) of cold rolled plate, the BH2value increased ；and as annealed at 820 °C , the BH2value of plate coiled at 640 °C was higher than that coiled at 710 °C.5|0|0更新时间：2026-01-21
- 摘要：Main ingredients of test mould powder were ( % ) 35. 46CaO, 32. 84SiO27. 87Al2O3,3. 04MnO ,8. 48Na2O, 7. 13F, 2. 6C. Samples of mould molten slag and slag film during casting of stainless steel !Crl7 were taken to study the change of ingredients and properties of molten slag and performance of slag film. Results showed that at casting for less than 10 min, the Al2O3and Cr2O3content in molten slag definitely increased while basicity of molten slag slightly decreased ,but for more than 10 min the contents were trending towards stability: as compared to fresh slag the melting temperature and viscosity of molten slag increased of which the change of solidification temperature was minor； the melting temperature of molten slag after change ingredient was still in suitable range, although the viscosity of molten slag increased by 0. 08 Pa , s； the slag film consisted of crystal layer and glassy layer, the crystallization ratio of slag film was about 71% and the main phases of film were cuspidite crystals with minor nepheline crystals.2|0|0更新时间：2026-01-21
- 摘要：In general, the section sizes of ESR furnace ingot for heavy slabs are (mm): (400 ~ 950) x (800 ~ 3 200) with weight 5 ~ 70 t. The furnace type of ESR Furnace for heavy slabs and the process characteristics such as control of hydrogen content in steel, ingot segregation and surface quality are analyzed in this paper. At present the main power supply method for ESR furnace of heavy slabs is single-phase bi-electrode connecting in series, of which the main characteristics are operating simply and reliably less inductive resistance loss, higher power efficiency, small overheat of liquid steel and nice costal quality.关键词：大型板坯;电渣重熔炉;工艺特点2|0|0更新时间：2026-01-21
- 摘要：Thickness, uniformity and mechanical properties of slag skin are main factors to influence the surface quality of continuous withdrawing electroslag remelting ( ESR) ingot. Thin and homogeneous slag skin is a kev to get ni(*e surface quality of ESR continuous casting ingot. The effect of current density distribution in slag bath, heat transferring conditions near mold wall, slag ingredient and factors to influence the change of temperature in "high-temperature region" on thickness of slag skin are analyzed in this paper. Production test results showed that thin and homogeneous slag skin with ensuring to satisfy long slag form and appropriate mechanical properties at high temperature was obtained by controlling operating temperature and slag ingredient in order to get nice surface quality of ESR continuous casting ingot.5|0|0更新时间：2026-01-21
- 摘要：With gear steel 20CrMnTi producing by 80 t LD-LF-CC process, as [Al] s decreases from 0. 030% to 0. 015% , the production cost per ton steel shall be decreased by 25. 8 yuan. In order to un-influence the cleanliness of liquid steel, in LD tapping the slag was strictly stopped, the 2 kg/t steel-clad aluminium was added with adding high basicity slag containing ≥70% CaO and ≤5% SiO2to carry out slag washing, argon blowing and feeding aluminium wire to [ Al ] s 0. 015% , in LF refining, lime lump and AD powder ( Al + Al2O3) were added to modify slag ingredient, then feeding Ca- Si wire and soft-blowing argon for more than 10 min. Results by 5 heats test showed that with improved process, the cast billet had higher cleanliness with ( 14-15) x 10-6T [0] , 0. 012% 〜0. 015% [S] and 0. 012% -0. 018% [P].关键词：酸溶铝;齿轮钢20CrMnT;LD-LF;洁净度2|0|0更新时间：2026-01-21
- 摘要：A set of domestic dynamic soft reduction equipment was installed at No5 280 mm x 380 mm bloom concast- ing line at Baotou Steel, bv which the pilot production for heavy steels U71 Mn and U75 V has been carried out for more than one vear. Results showed that with suitable process conditions, the central carbon segregation in heavy rail steels improved obviously by using soft reduction technology: the index of central carbon segregation in cross section of bloom was ≤1.08, the fluctuation of index of carbon segregation along longitudinal central line of bloom appreciably decreased and the chenii- cal composition deviation of steel rail also decreased.关键词：Bloom Concasting;Dynamic Soft Reduction;Carbon Segregation Index;Carbon Element Deviation Index2|0|0更新时间：2026-01-21
- 摘要：Structure and properties of 3. 0 inm extra-low carbon steel strip ( % : 0. 008C, 0. 029Als, 0. 000 8 B, 0. 001 4N) hot finish-rolled by 1 880 mm hot rolling mill train in austenite region (945 ~ 848 °C ) and in ferrite region (803 - 755 °C ) , coiled at 700 °C , then cold rolled with 73% reduction and annealed have been studied and compared. Results showed that as compared with austenite region rolling, with ferrite region rolling the cold rolled steel strip annealed at 710 °C had higher elongation, plastic Strain ratio (r) and strain-hardening exponent (n) , therefore it had better deep drawability.2|0|0更新时间：2026-01-21
- 摘要：Based on fundamental process theory for modern electric arc furnace steelmaking (EAF) , the thermo chemistry calculating model and exergitic model to describe EAF steelmaking process have been established, by which the simulation of steelmaking process for a 60 t DC EAF at Daye Special Steel was carried out to carry out the energy and exergy analysis on EAF steelmaking process with charge of 100% scrap, 30% hot metal + 70% scrap, and 64. 4% hot metal + 35. 6% scrap. Results show that the melting electric energy consumption decreases obviously by charging part hot metal, but total energy utilization ratio decreases, and as considering to recover and utilize waste gas and cooling water physical exergy, the exergy of EAF steelmaking process increases slightly.2|0|0更新时间：2026-01-21
- 摘要：Bearing steel GCrl5 is produced by hot metal pretreatment- 120 t top and bottom combined blown convert- er-LF-RH-280 mm X 380 mm CC process at Pan Steel. With converter recarburization practice and slag stopping technology during tapping, controlling converter end [C]：0. 03% ~0. 07% , adding deoxidizing agent containing CaC2during tapping for pre-deoxidizing, deoxidizing by aluminium after tapping, controlling the basicity (CaO/SiO2) of LF refining slag 3. 0 ~ 5. 0, and average overheat of liquid steel in tundish = 26. 5℃ , the examination results showed that carbon segregation index was 1.08, average [0] 8x10-6[P]≤0. 015%,[S]≤0.011%，and the rating of inclusion in steel met the requirement of standard.关键词：转炉-LF-RH-CC流程;GCr15轴承钢;冶金质量2|0|0更新时间：2026-01-21
- 摘要：Effect of casting speed, super-heating degree of liquid steel in tundish on middle crack of cast blank and effec-t of mold cooling water technical parameters on shell thickness and关键词：Horizontal Casting;Steel 40Cr;Round Billet;Casting Process;Middle Crack5|0|0更新时间：2026-01-21
- 摘要：Some of cast slab of low carbon Si-Mn-B steel (% : 0. 16 ~ 0. 17C, 1. 10 ~ 1. 12Si, 1. 80 ~ 1. 85Mn, 0.001 0 ~ 0. 001 1 B) fractured in cross section after multiple conveying. The analysis on cast process, chemical coniposi- tion, structure and mechanical properties of slab showed that cast process for both fractured and un-fractured slab batch was same: for fractured slab, its S content was 0. 004% , P content was 0. 025% , middle crack rating 1. 5 and there was Irans- granular crack in structure ； for un-fractured slab, its S content was 0. 004% , P content was 0. 008% , middle crack rating 0 and the micro-crack wasn't observed in structure. The analysis results showed that higher P content in steel led to slab fracture, after multiple conveying.关键词：Low Carbon Steel;Cast Slab;P Content;Middle Crack;Fracture2|0|0更新时间：2026-01-21
- 摘要：Coarse grains occurred in the non-quenched-tempered steel 48MnV (% : 0. 45 ~0. 51C, 0. 90 ~ 1. 20Mn, 0. 05 〜0. 10 V ) produced by 100 t EAF-LF ( VD) -300 mm x 320 mm casting-continuous rolling process. As added 0. 030% 〜0. 050% Ti in steel, the rating of grain in 125 mm x 125 mm square bar rolled with 13 passes was 3 ~ 4 ； the rating of grain in Φ141 mm roun(i bar ( contained 0. 030% 〜0.053% Ti) rolled with 9 passes was 4 ~5; but as added 0. 018% ~0. 035% Ti and 0. 021 % 〜0. 029% Nb in steel, the rating of grain in Φ141 mm round bar rolled with 9 passes was 5. 5 〜6. 5 in order to obviously increase strength and toughness of steel.关键词：Non-Quenched-Tempered Steel 48MnV;Continuous Casting and Rolling;Ti-Nb;Grain Refining2|0|0更新时间：2026-01-21
- 摘要：Liquid steel flow and heat transfer-solidification process were simulated and analyzed by CFX4 4 software ,and relation between relative process parameters and immersed nozzle structure has been discussed in order to decrease carbon segregation of 300 mm X 300 mm cast bloom of bearing steel. Production practice showed that a immersed nozzle with 4 holes was used instead of original one with straight hole, the center carbon segregation rating of cast bloom decreased from 1. 0 ~ 2. 0 to 1. 0 ~ 1. 5 , and the percentage of ≤1. 0 rating of bloom with using 4 holes nozzle was 79% while that with using straight hole nozzle was only 50% .关键词：Bearing Steel;Cast Bloom;Immersed Nozzle with 4 Holes;Center Carbon Segregation2|0|0更新时间：2026-01-21
- 摘要：Parallel convex strip defect at surface of hot galvanized steel plate ( % : 0.001 5 C, 0. 004P, 0. 005S, 0. 02A1, 0. 04Ti) has been studied by SEM and EDS, and it was obtained that the defect included black spot, microcrack, conchiform pattern, scratch trace and scale. Analyzed results showed that higher Sb content in galvanizing solution to increase brittleness of galvanized layer, higher Al content in galvanizing solution and lower temperature of solution, and retaining scratch defect and un-removed scale led to formation of surface defect of galvanized plate.关键词：Hot Galvanizing Process;Plate Surface Defect;Analysis2|0|0更新时间：2026-01-21
- 摘要：Nb microalloying high strength ship plate was produced by 100 t converter-100 t LF-200 mm x 1 500 mm caster-2800 mm medium plate mill flow sheet at Anyang Steel. Production data statistic results showed that with precisely controlling chemical composition of steel ( % : 0. 13 ~0. 16C, 0. 33 ~0. 43Si, 1. 31 ~ 1.42Mn, 0. 007 〜0. 014P, 0. 005 〜 0. 018S, 0. 021 ~0. 039Al, 0. 018 -0. 022Nb) , beginning finish rolling at 950 °C , total reducing ≥50% in finish rolling, and end finish rolling at 780 ~ 850 °C , the grain size rating of 6 〜25 mm steel plate of grade AH36 was 9 ~ 9. 5, yield strength 360 ~475 MPa, tensile strength 490 〜610 MPa, 85 elongation 18% 〜36% and impact energy at 0°C 110 〜221 J.关键词：Nb Microalloying;High Strength Plate;Control Rolling5|0|0更新时间：2026-01-21
- 摘要：Test high speed steel M2 ( % : 0. 85C, 5. 92W. 4. 74Mo, 3. 86Cr, 1. 84V) was melted by 25kg vacuum induction furnace and ingot was cast bv sand mould. The effect of 0 ~ 1. 3% Al on stiucture of as-cast steel has been studied. Results showed that added 0. 6% Al was available to fine the ledeburite network and improve the distribution of carbides in steel ； while added excessive amount of Al (1. 3% ) promoted the formation of a great lot of acicular carbide eutectoid-transformed from δ ferrite in primary grain. Al promoted the M2C carbide translbrnied from curved rod-like to straight lamella-like in which the alloy element content increased. Compared with lamellar M2C, the rod-like M2C easily decomposed short rod-like and granular carbides favorably to improve the morphology of carbide in steel.关键词：Al;高速钢M2;铸态组织;M2C共晶碳化物2|0|0更新时间：2026-01-21
- 摘要：Effect of cooling rate after rolling (20 ~0. 5 °C /s) , initial pass temperature of finishing rolling ( 1 000 ~ 900 °C ) , last pass temperature of finishing rolling (860 ~750 °C ) and coiling temperature (630 ~ 500 °C ) on niicrostnie- ture of pipeline steel X65 (0. 08% C, 1. 38% Mn, 0. 032% Nb, 0. 041 % V, 50 x 10-6N ) has been studied by using Gleeble-3500 thermal-mechanical simulator. Results showed that with increasing cooling rate after rolling, decreasing reduction ratio at about 950 °C , decreasing finishing and coiling temperature, the microstructure of plate products was finer. The rolling temperature for 7. 1 mm finished plate rolled by 150 mm x 1 700 mm slab was proposed that 1 150 ~ 1 200 °C heating, rough rolling ≤1 130 °C to 35 mm, initial pass finishing rolling 950 ~ 1 020 °C , last pass finishing rolling ≤83O °C , and coiling ≤580 °C , and the mechanical properties of products met the requirement of standard.2|0|0更新时间：2026-01-21
- 摘要：Effect of phase proportion and solution temperature on structure and mechanical properties of steel 00Cr25Ni7Mo4N ( % ： 0. 007 ~0.009C, 24. 50 〜24. 84Cr, 6.92 〜6.99Ni, 3.65 〜3. 72Mo, 0. 27 ~0. 30N) melted by vacuum induction furnace (6. 5 kg ingot) has been studied. Results showed that with increasing solution temperature from 1 050 °C to 1 200 °C , ferrite content in steel increased from 48% 〜50% to 53% 〜55% ; with increasing solution temperature from 1 050 °C to 1 100 °C , the strength of steel decreased while the elongation and impact toughness of steel increased ,and with increasing the solution temperature from 1 100 °C to 1 200 °C , the strength of steel increased while the e- longation and impact toughness of steel decreased, so optimum temperature of the steel was 1 100 °C ±50°C.2|0|0更新时间：2026-01-21
- 摘要：Structure and mechanical properties of maraging steel 00Ni14Cr3Mo3Ti (% ： 0. 002C, 14. 06Ni, 3. 19Cr, 3. 06Mo, 1. 32Ti) with 750 ~ 1 050 °C solution treatment have been studied. Results showed that with ≤900 °C solution treatment the austenite grain size and strength of steel wasn't obvious change, as solution temperature was more than 900 °C , with increasing temperature the austenite grain size increased appreciably and the strength of steel presented declining trend. As solution temperature increased from 750 °C to 900 °C , with decreasing Fe2Mo phase amount in steel and completely dissolving at 810 °C , the impact energy of the steel increased from 32 J to 61 J, and as solution temperature increased from 900 °C to 1 050 °C , with austenite grain coarsening the impact energy decreased from 61 J to 26 J.关键词：马氏体时效钢00Ni14Cr3Mo3Ti;同溶处理;奥氏体晶粒;力学性能2|0|0更新时间：2026-01-21
- 摘要：Effect of Ti content (0. 35% ~ 1. 10% ) on structure and mechanical properties at ambient and 350 °C for nickel base alloy Inconel 690 (% : 0. 034 〜0. 036C, 29. 40 〜29. 68Cr, 9. 11 〜9. 22Fe, 0. 34 〜0. 36 Al, 0.004 4 〜 0. 004 5N) solid solution treated at 950 〜1 100℃ , water quenched and aged at 715 °C for 15 ~ 100 h, air cooled has been studied. Results showed that the strength (Rmand RP0.2) of 1. 10% Ti alloy was by 200 ~ 400 MPa higher than that of 0. 35% 〜0. 70% Ti alloy, the main reason of increasing strength was 3. 70% ~3. 99% γ′ strengthening phase precipitated in 1. 10% Ti allov after aging at 715 °C , while only 0 - 0. 53% γ' strengthening phase precipitated in 0. 35% - 0. 70% Ti alloy after aging at 715°C .关键词：Inconel 690镍基合金;钛含量;力学性能2|0|0更新时间：2026-01-21
- 摘要：Effect of relaxing for 30 - 60 s after finishing rolling at 850 Y before cooling in air flow on yield strength- ultimate tensile strength (YS-UTS) ratio of 12 nini plate of Nh microalloving steel Q345GJC (% : 0. 16C, 1. 37Mn, 0.026Nb) has been studied. Results showed that with increasing relaxation time the grain size and content of ferrite increased and laniellar of pearlite colony thickened to decrease YS-UTS ratio. The YS-LTS ratio of test steel with relaxing for 30 s decreased to 0. 737 from 0. 765 of original un-relaxing steel, and that with relaxing for 60 s decreased to 0. 718.关键词：YS-UTS Ratio;Steel for High-Rise Building;Grain Size;Thickness of Lamellar2|0|0更新时间：2026-01-21
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