最新刊期
卷 36 ， 期 4 ， 2015
- 摘要：According to the research prototype of a 35 t tundish for casting three-strand unsymmetrical 320 mm x 480 mm bloom of GCrl5 bearing steel, with using geometric similarity ratio 1：3 water model combined with mathematical simulation ,the effect of different baffle device on liquid flow field in tundish is studied to optimize the tundish flow field and get optimum baffle device. Results show that of original prototype tundish the residence time is smaller and the dead area volume fraction is up to 39. 68% ; adding optimized Y-type baffle the average residence time of three nozzle increases by 29. 51 s, the dead area ratio decreases by 15. 54% and each nozzle is more identical. The pilot production of GCrl5 bearing steel in situ show that after tundish optimization the T [O] in tundish liquid decreases from original 19. 3 x 10-6~26. 3 x 10-6, average value 22. 7 x 10-6to 9. 5 x 10-6~ 17. 2 ×10-6average 12. 3 x 10-6number of inclusions in casting bloom decreases from 12. 0 ~15.3/mm2to 6. 8 ~8. 4/mm2and the number of > 1. 25 μm inclusions decreases obviously.关键词：35 t;三流中间包;数值模拟;物理模拟;流场2|0|0更新时间：2026-01-21
- 摘要：The effect of Ca-Si wire and FeS adding sequence on morphology of sulfide and cutting performance of low carbon structural steel (/% ：0.16C, 0.65Mn, 0.25Si, 0.034S, 0.025P) is studied by using a 10 kg induction furnace. Based on inclusion modification treatment of nonmetallic inclusions in steel, with using Image Pro Plus analysis software quantitatively to analyze the inclusions indexes, it is obtained that with using the mode of adding Ca-Si wire first, then adding FeS, the average length of inclusions in steel is 12. 3 μm and the amount of string inclusions and amount of granular inclusions in steel are respectively 64/mm2and 41/mm2while with using the mode of adding FeS first, then adding Ca-Si wire, the average length of inclusions in steel is 9. 9 μm, and the amount of string inclusions and amount of granular inclusions in steel are respectively 52 /mm2and 53 /mm2and the cutting performance is better than that with using first adding Ca-Si wire mode. The first adding FeS then adding Ca-Si wire mode is favorable to control the morphology of sulfide in steel.2|0|0更新时间：2026-01-21
- 摘要：According to the actual production situation of an 180 t converter, based on revised Froude number as experiment similarity number, a water model with geometrical-similar ratio 10 ： 1 is established, the four holes symmetric bottom blowing test has been carried out, and with optimum bottom blowing process parameters (the bottom blowing optimum location is nozzle at the concentric circles which diameter / converter bath diameter =0. 3, and the optimum flow rate is 0. 7 m3/h with mixing time 18. 2 s) , and the test of top and bottom combined blowing jet-bath interaction has also been carried out by modifying gas rate and lance level of top blowing oxygen lance. Results show that in bottom blowing condition, with increasing top blowing process ( optimum lance level 150 mm, optimum gas flow rate 39 m3/h) the bath average mixing time decreases by 5. 6 s, the economic benefits of 180 t converter top and bottom combined blowing steelmaking process increases obviously.2|0|0更新时间：2026-01-21
- 摘要：With using three-dimensional math model established by ANSYS Fluent software the numerical simulation on flow distribution in nozzle and pool area designed for 6. 5% Si high silicon steel twin-roll 2. 0 mm thin strip casting has been carried out and according to calculated results 1/4 model of liquid flowing and heat transferring the original designed structure is optimized, that is canceling the contacted angle between flow distribution holes and pool to ensure whole cross sectional area of holes constant, modifying the flow direction of straight holes from K to X, designing 3 horizontal flow holes, i. e. double 10 mm x 12 mm holes and one 21 mm x 12 mm hole with distance between the holes- 33 mm, while changing the cross section area of oblique flow hole to 7 mm x 10 mm. The simulated results verify that optimized structure is more available to formation of solidification zone.关键词：6.5%Si钢;双辊薄带连铸;布流孔;三维;数值模拟;凝固区;优化2|0|0更新时间：2026-01-21
- 摘要：Based on published patented manufactured technologies of corrosion-resistant steels for oil country tubular goods ( OCTG) in the world from 1994, the characteristics of research and development of corrosion-resistant steels for OCTG at manufacturing enterprises and the chemical composition, key manufacturing technologies and properties of corrosion-resistant steels for OCTG including martensite, austenite, dual phase and complex phase stainless steels, low alloy steels and Cr alloy steels are summarized. The key points of research and development at OCTG manufacturing enterprises are development of the OCTG with low cost and corrosion resistance in various conditions.关键词：油井管用钢;耐腐蚀;专利;研发2|0|0更新时间：2026-01-21
- 摘要：With analysis on damage mechanism of lining of 100 t top and bottom combined blowing converter at Shuisteel and influence factors on slag melting performance, it is obtained that with containing per 1% V2O5content in slag the slag melting point drops by 27℃with adding per 1%TiO2content the hemisphere temperature of slag decreases by about 5 ℃，and as TFe content in slag is more than 20% , the range of melting temperature of slag is 1 320 ~ 1 395 ℃ . With taking the measures including hot metal fishing-slag process ； establishing converter thermal equilibrium operation mode to increase the rate of carbon-catching； using single-slag operation as Si content in hot metal is 0. 6% ~ 0. 8% and using double-slag operation as Si content in hot metal is more than 0. 8% ； establishing converter optimum converter lines and control measures ；optimizing molten steel temperature schedule and deoxidizing-alloying scheme to decrease the temperature of steel ； and adding appropriate amount of nut coke before reblowing rising oxygen lance to ensure lower FeO content in end slag arid improve effect of slag splashing for furnace maintenance, the consumption of refractory of converter steelmaking decreases to 8. 75 kg/1 and life of converter is up to 29 336 heats.5|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of 8〜10 mm plate of steel J55 for oil casing tube is hot metal pretreatment-120 t top and bottom combined blowing converter-LF refining-87 mm thin slab casting-continuous rolling process. With the process measures including based on original 0.015% ~0.025% Nb microalloying steel optimizing the composition of J55 steel for oil casing tube (/%:0.16 ~0.18C, 0.5-0.7Mn, ≤0.20Si, ≤0.025P, ≤ 0.010S, 0.03 ~0.04Cr, 0.01 ~ 0.03Ti, 0.005 ~0.010Nb) pre-oxidizing by adding 200 ~ 400 kg aluminium magnesium calcium alloy at converter tapping, deep de-oxidizing by feeding aluminium wire and calcium treating at T[O]≤20 x 10-6during refining process, slab heating at 1 100 - 1 130 ℃ , finishing rolling at 855 ~ 860 °C and quick cooling after rolling, and coiling at (610 ± 10) ℃， the properties of finished steel plate are yield strength 437 ~465 MPa, tensile strength 549 〜575 MPa, elongation 30% 〜 36%, impact energy at -20 ℃ 60 ~ 96 J, 180℃ cold-bending test qualified, and each properties of products are steady.关键词：含铬J55石油套管用钢;铌钛微合金化;120tBOF-LF-薄板连铸-连轧;控轧控冷;力学性能2|0|0更新时间：2026-01-21
- 摘要：10 heats of non-quenched-tempered steel 49MnVS3 (/% : 0.46 ~ 0.48C, 0,30 ~ 0.40Si, 0.88〜0.92Mn, 0.001~0. 014P, 0.004 ~ 0.005S, 0.09~ 0.10V, 0.19 ~ 0.22Cr) are produced by 100 t EBT DC EAF-LF- VD-260 mm x 340 mm bloom casting-Φ140 〜150 mm round bar rolling process flowsheet. With using the process measures including charging 75% hot metal, in EAF earlier period dephosphorizing to ≤0.015%P, before tapping controlling 0.20% ~0. 30% [C] , in refining adding 150 ~200 kg silicon carbide, controlling LF refining slag basicity 2. 80 ~2. 95 and ( CaO)/( Al2O3) = 1.2 ~ 1. 6, after VD feeding 1. 5 m/t calcium-iron wire and soft argon blowing for ≥15 min, the [N] , [H] and [O] of steel 49MnVS3 are respectively 130 x 10-6- 220 x 10-61.2 x 10-6- 1.5 x 10-6and 5 x 10-6~ 11 x 10-6finished products grain size is N5 rating, nonmetallic inclusions and macrostructure are all ≤ 1. 5 rating, the structure (banded orientation ≤1 rating) and the mechanical properties (Rm803 ~883 MPa, Rel517 〜590 MPa, A 16% ~21%, Aku39~59J) all meet the requirement of standard.关键词：100 t DC EAF-LF-VD-CC流程, 非调质钢49MnVS3;工艺实践5|0|0更新时间：2026-01-21
- 摘要：With using the process measures including controlling mold inlet water temperature 40℃outlet water temperature 68 ℃ ； controlling model of computer auto back feeding for shrinkage ； at end auto back feeding, changing consumable electrode to graphite electrode withing 90 s and power supply with 53 V, 3 000 A melting for 3 ~5 min, then again changing to consumable electrode and power supply with 50 V, 4 000 A for 6 min, the depth of top shrinkage cavity defect of electroslag remelting ( ESR) ingot decreases to 30 ram from original 100 mm. Production practice shows that the process operation of back feeding for shrinkage is simple and easier to do. The forged billets of remelting 210 piece tool steel 9Cr2Mo Φ 280 mm x 1 000 mm, 480 kg ESR ingot and 60 piece hot die working steel H13 420 mm x 1 400 mm , 1 500 kg ESR ingot by optimized process have not been rejected due to ingot top shrinkage cavity defect, the ingot yield increases obviously.3|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of austenite stainless steel 0Crl8Ni9 is hot metal dephosphorizing pretreatment- 75 t BOF-VOD-LF-200 mm x 1 200 mm slab casting process. The change of ingredient of 20 t tundish shielding agent (/% : 40.54CaO, 28.89Al2O37.8SiO26.32MgO, 1.84C, basicity 5.2) during continuous casting process, and removal effect of oxygen and inclusions in steel are analyzed. The results show that with using high basicity tundish shielding agent after multi-heats continuous-continuous casting the effect of shielding agent absorbing silicate type inclusions is obvious, the average oxygen content in steel decreases from 56. 5 x 10-6after LF refining to 37. 5 x 10-6in tundish and to 33.3 x 10-6in casting slab of stainless steel 0Cr18Ni9； as compared with end LF the amount and size of inclusions in casting slab decrease markedly, and the high basicity tundish shielding agent has an obvious effect on removal of larger inclusions with size more than 20μm.6|0|0更新时间：2026-01-21
- 摘要：The production flow sheet for studied 0. 80% ~0. 82% C Steel for tire cord is 80 t BOF-CAS-LF-VD-150 mm x 150 mm CC process. With adding 300 kg manganese metal and 200 kg high purity silicon during top and bottom blown converter tapping to silicon-manganese combined deoxidize, during LF refining first slagging refining slag with basicity (CaO/SiO2)2. 04 then decreasing the basicity ( CaO/SiO2) to 0. 86 and maintaining -5% Al2O3content in slag to control the plasticity transformation of nonmetallic inclusions in steel. Results show that the average total oxygen content in casting billet is 16 X 10-6and the nitrogen content in billet is controlled about 50 x 10-6during CAS ( Composition adjustment by sealed argon bubbling) process the main inclusions in steel are MnO-Al2O3-SiO2in LF and VD process, and in casting billet the main inclusions are CaO-Al2O3-SiO2-MgO series, the size of that inclusion series is smaller i. e. 2 ~ 3μmwhich distribute near the 1 400 °C low melting zone.5|0|0更新时间：2026-01-21
- 摘要：The production flowsheet for 012 ~ 32 mm bars of gear steel 20CrMo (/%:0.19 〜0.23C, 0.48 ~ 0.58Mn, 0.24 〜0.28Si, 0.009 -0.015P, 0.003〜0.012S, 0.87 ~1.08Cr, 0.17 ~0.18Mo, 0.024 ~ 0.046Als) is desulphurizing hot metal-120 t top and bottom combined blowing converter-LF-soft argon blowing-200 mm x 200 mm billet concasting-continuous rolling process. Results show that with using the process measures including controlling hot metal [S]≤0.030% , BOF end [C] 5:0.08% and end [P]≤0.012% , adding 0.6 ~ 1.0kg/t aluminium pig for pre-deoxidizing at BOF tapping, controlling LF refining slag basicity 3.5 〜5.0, casting liquid overheating extent 20 ~30 ℃, casting rate 1. 1 ~ 1. 4 m/min, beginning rolling at 1 060 ~ 1 100 °C and finishing rolling at ≤900 ℃，the total oxygen content and the nitrogen content in steel are respectively 12. 5 x 10-6〜22. 5 x 10-6and 33 x 10-6~40 x 10-6the rating of central and general porosity in rolled products is 0. 5 ~ 1. 0, the hot upset test and the mechanical properties of steel meet the requirement of standard, and the hardenability band width △J9HRC value is 3. 0 and the △J15HRC value is 4. 2.2|0|0更新时间：2026-01-21
- 摘要：According to thermodynamic calculation it is obtained that by BOF double slag method in earlier stage the optimum temperature for dephosphorization is 1 320 ~ 1 355 ℃ and the suitable basicity of slag is 1.3 ~ 1.6, and the commercial production test of 4 heats of steel DC04 by 210 t top and bottom combined blowing converter has been carried out. Results show that with the controlling measures including 60% ~80% slag amount heels by remaining slag operation, blowing for 3 ~4 min then carrying out the skimming earlier slag operation, and adding green dolomite 10 kg/t and pellet 15 kg/t ingredient of earlier slag sample being 33% ~39% CaO and 20% 〜25% SiO2(basicity L 3 〜1. 6) , in later stage secondary slagging adding lime 16 /t, pellet 15 kg/t and light-burned dolomite 10 kg/t, ingredient of later slag sample being 44% ~47% CaO and ≤15% SiO2(basicity 2. 85 - 3. 20) , during tapping by double slag method the average [P] is 0. 014% , the yield of [ Mn ] is ≤30% , and the TFe content in slag in earlier stage is 8. 0% ~ 12% , that has not appreciable influence on the TFe content in slag in later stage.2|0|0更新时间：2026-01-21
- 摘要：Change of structure in specimen cutting from casting slab of non-oriented silicon steel (/% ： 0. 001 8C, 0.76Si, 0.24Mn, 0.074P, 0.003S, 0.001 Al, 0.005 60,0.001 IN) cooling from 1 400 ℃：to 600 ℃. with 5 ~40 ℃/s rate has been observed at real-time by using a high temperature confocal microscope, and after observation the inclusions in specimen are extracted and analyzed by non-aqueous solution electrolytic method. Results show that steel cooling to the two precipitation period i. e. beginning precipitated at 987 ~ 1 020 ℃ (higher temperature) and 830 ~ 636℃(lower temperature) and finishing precipitated at 952 ~918 °C and 804 ~ 636 ℃. there are new phases respectively precipitated； in first (higher temperature) period with increasing cooling rate the beginning and finishing temperature of new phases all increase but the precipitated temperature period decreases, at second (lower temperature) period with increasing cooling rate the beginning and finishing precipitated temperature of new phases all decrease but the precipitated temperature period increases, beside at lower cooling rate the higher precipitated temperature period is favorable to sufficient precipitation of new phases, and at higher cooling rate the lower precipitated temperature period is favorable to sufficient precipitation of new phases ； with increasing cooling rate the inhibition effect of inclusions on grain growth gradually decreases, the average grain size of steel first decreases and comes down to minimum value with cooling rate 10 ℃/s, then monotonically and quickly increases. Therefore the cooling rate less than 5 ℃/s or more than 20 ℃/s should be selected to avoid forming 0.21 ~ 0.50μmMnS and AIN, as well as CuxS inclusions precipitated in cooling later stage to get better magnetic performance.5|0|0更新时间：2026-01-21
- 摘要：The hardness and structure of bearing steel GCr15 by normal continuous spheroidizing annealing at 780 °C with 15 -20 °C/h furnace cooling to 660 °C , and by isothermal spheroidizing annealing at 780 T with 30 °C/h cooling to 720 °C for 2 h then with 20 °C/h furnace cooling to 660 °C are compared and analyzed. Results show that at same annealing time condition, by using continuous annealing process the HB hardness value of steel CCr15 is 184 〜202 and the spheroidizing structure rating is 2. 0 〜3. 5, while by using isothermal spheroidizing annealing process the HB hardness value of steel GCr15 is 191 ~ 198 and the rating of spheroidizing structure is 2.0 ~ 2. 5 to get better effect.2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet for casting bloom of test low carbon cold heading steel (/% :. 0.14 ~0.20C, ≤0.20Si, 0.3 ~ 1.0Mn, ≤0.030P, ≤0.035S, 0 ~0.001 9B) is 80 t BOF-LF-280 mm x 325 mm bloom casting process. The effect of 0. 14% 〜0. 20% C and 0 ~ 0. 001 9% B on mechanical properties of the cold heading steel at 600 ~ 1 200 °C has been studied by using Gleeble-3500 thermal simulation machine. Results show that the III brittle zone of the steel is 700 ~ 900 ℃, as the C content in steel is higher the temperature of minimum plasticity of steel is lower； the boron promotes to occur of two valleys in 700 ~ 950℃ brittle zone, but as the B content in steel is up to 0. 001 9% , the elevated temperature plasticity of steel is improved. At 850 ~ 1 200 ℃ each test steel has better plasticity to be suit for larger deformation, therefore straightening and hot-working temperature should be controlled at more than 850 °C.关键词：碳, 硼, 低碳冷镦钢;连铸坯;高温力学性能2|0|0更新时间：2026-01-21
- 摘要：The thermal deformation behavior of 420 mm casting slab of 690 MPa high-strength steel for ocean engineering (/% ：0. 12 〜0. 15C,1.05 ~ 1.20Mn,0.5 ~0. 7Cr, 1. 0 ~ 2.0Ni,0. 5 ~0. 6Mo,0. 3 ~0. 6Cu,0.015 〜0.035Nb, 0. 008 〜0. 020Ti ,0. 04 ~0. 07Alt) with 20% deformation and strain rate 0. 05 ~ 5 s-1at 1 000 ~ 1 100 ℃ has been tested studied by using Gleeble 3800 thermal simulation machine to get true stress-strain curves, strain-hardening rate-deformation stress curves, thermal deformation constitution equation and dynamic recrystallization thermal activation energy of the steel. Results show that at same test temperature with increasing strain rate the corresponding deformation stress increases ； while with increasing deformation temperature the deformation stress decreases ； and the dynamic recrystallization thermal activation energy of the steel is 499 954. 0 J/mol.4|0|0更新时间：2026-01-21
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