最新刊期
卷 39 ， 期 3 ， 2018
- 摘要：The flowsheet of 236 mm x 1 350 mm casting slab of tested steel CR1030/1300MS (/% : 0. 13C, 0. 26Si, L53Mn, 0.011P, 0.002S, 0.31Cr, 0.047Als, 0.029Nb, 0.032Ti, 0.002 5B, 0.003 2N) is 260 t BOF-LF-RH-CC process. With using Gleeble3500 thermal simulation test machine the thermoplasticity curves of test slab at 650 ~ 1 300 °C has been measured and the structure of high temperature tensile specimen fracture is analyzed. The test results obtain that the two brittle zones in test steel are melting point 〜1 120 °C and 800 〜650 °C , and the better plasticity occurs at 1 120 ~ 800 °C , in this zone the reduction of area of steel is more than 85%. The fracture of tensile of steel at 900 °C. is transgranular toughness fracture and at 700 °C it is toughness and along crystal fracture. The structure near fracture of tensile of steel at 1 250 °C and 900 °C is martensite and with increasing temperature the martensite lath is coarser. The basic reason to form crack is that the proeutectoid ferrite occurs in original austenite grain boundary at 750 °C.Straightening at 1 120 ~ 800 °C is available to avoid the casting bloom forming crack.关键词：高强度钢CR1030/1300MS 236 mm x 1 350 mm连铸板坯;热塑性;断口分析2|0|0更新时间：2026-01-21
- 摘要：The thermodynamic calculation on deformation of inclusions in tested steel GS35C-A (/% : 0. 34 ~0. 35C, 0. 20 ~0. 22Si, 0. 69Mn, 0. 013 ~0. 016P, 0. 026 ~0. 045S, 0.027 〜0. 046Al, 0.000 8 - 0.001 9Ca) has been carried out, and the morphology and amounts of inclusions in steel produced by corresponding process 1[ BOF-LF ( sulphur alloying)-RH-calcium treatment-CC] and optimized process 2 [BOF-LF-RH-calcium treatment- sulphur alloying- CC] are studied. Results show that (a) with increasing [S] in liquid the balancing calcium content in steel to form CaS decreases； and in process of forming low point melting inclusions modified by calcium treatment the [Al] in liquid gradually decreases； (b) with decreasing end RH Ca and S content in liquid respectively from 0. 001 9% and 0. 045% ( process 1) to 0. 000 8% and 0. 026% ( optimized process 2) , the average continuous-continuous casting heats increases respectively from 2. 5 heats to 8 heats; ( c) before optimization by process 1 the typical inclusion in liquid in tundish consists of sulphide around magnesia aluminium spinel, while after optimization by process 2 the inclusion in liquid in tundish is calcium aluminate; and as compared with before optimization, after optimization the number of inclusions per mm2in steel at end RH and in tundish decreases respectively from 9.09 and 6.23 to 5.06 and 3.76.4|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of Ti-bearing welding wire steel GF50-G (/% : 0. 08C, 0. 83Si, 1.55Mn, 0. 014P, 0. 012S, 0. 19Ti) is 80 t top and bottom combined blowing converter-LF-160 mm x 160 mm billet casting, and the phenomenon of nozzle clogging often occurs in casting process. It is obtained by analysis of SEM and EDS on nozzle clogging deposit that the main phase in deposit is TiO2. The thermodynamic calculation of nozzle clogging deposit shows that the Al content in liquid steel-[ Als] should be controlled less than 0. 008% in order to avoid Ti-deoxidized products being reduced by [ Al] and forming aluminium-titanium inclusions. Based on production practice with increasing temperature of liquid steel in tundish from 1 542 °C to 1 550 °C , controlling [ Alt] ≤ 0. 010% , [O] ≤ 15 x 10-6before adding ferrotitanium and decreasing reoxidation of liquid steel the nozzle clogging could be prevented, and the continuous casting heats may increase from 3 ~4 heats to 8 ~ 10 heats.关键词：含钛焊丝钢GF50-G, 水口结瘤, TiO2, , ;工艺优化, 生产实践4|0|0更新时间：2026-01-21
- 摘要：Based on the production data the analysis on thermodynamics, kinetics of RH carbon-oxygen reaction and natural decarburization in 120 t RH refining process of low carbon steel QD08 (/% ： W0. 07C, 0. 15 〜0. 35Si, 0. 25 〜 0. 45 Mn, W0. 035P, W0. 035 S) has been carried out to get the optimized process for RH refining natural decarburization. The results show that with BOF end temperature ≥l650 °C , RH initial temperature of liquid ≥1600 °C , BOF end [C] 0.04% ~0.10% , end [P] ≤ 0.018% , before BOF tapping adding top slag lime 200 kg and during tapping non-adding alloy and deoxidation agent, and RH vacuum 4 ~8 kPa for 6 ~ 8 min, the liquid [C] shall decrease to ≤ 0,05%.2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of Φ108 mm x 15 mm tube shell of tested steel TP347H (/% : 0. 08C, 0. 36Si, 1. 27Mn, 0. 020P, 0.0005S, 18.l0Cr, 10.80Ni, 0.78Nb, 0.007Cu) is hot-metal pretreatment- 90 t K-OBM-S melting- VOD-LF-220 mm x220 mm bloom casting- hot-rolled to Φ110 mm tube blank- piercing to tube shell. The batches intermittent and irregular cracks at inner wall of shell occur after pickling. By examination and analysis the inner defects of shell it is defined that inner defects is double layers formed by large-external composite inclusions in base, during conical-extrusion-piercing process, the base metal produces breaking caused by uneven stress led to form inner wall cracks. With prolonging LF soft stirring time and killing time, maintaining liquid in tundish more than 20 t, increasing the quality of submerged nozzle and increasing the baking temperature of nozzle form ≥800℃ to ≥1 000℃, the rating of each type of inclusions is 0 ~ 1.0 and the rate of shell inner defects decreases form 3.41% to less than 0.01%.关键词：TP347H奥氏体不锈钢;Φ 108 mm X 15 mm荒管, 内壁夹杂物裂纹, 工艺改进2|0|0更新时间：2026-01-21
- 摘要：The effect of wire finished rolling temperature and cooling rate at I 〜HI section of Stelmor cooling line on thickness of oxide scale, ingredient and structure and flaking properties of coil of steel 72A (/% : 0. 70 ~0. 75C, 0. 15 〜 0. 35Si, 0. 35 ~0, 60Mn, ≤ 0. 025P, ≤ 0. 025S) has been studied by SEM and bending test. Results show that the descaling performance of oxide scale is mainly associated with thickness of scale, and the scale with thickness 10 ~ 12 μm has better mechanical-descaling performance ； the thickness of FeO layer is positively correlated with the descaling performance of scale, and the scale with thickness more than 9μm has better descaling performance, while the Fe3O4layer is negatively correlated with the descaling performance of scale； with increasing cooling rate the thickness ratio of FeO layer increases, with outlet wire temperature up to 910℃ , increasing cooling rate of coil at Stelmor cooling line i. e. 6 ~ 7. 5 ℃ /s at I section and 12 ~ 20 °C/s at Ⅱ section the mechanical-descaling performance of high carbon steel coil is effectively improved.2|0|0更新时间：2026-01-21
- 摘要：The metallurgical process flowsheet of produced steel SA-210A1 for high pressure boiler (/% : 0. 08 ~ 0. 11C, 0.22 ~0.24Si, 0. 72 ~0.74Mn, 0. 007 ~0.010P, 0.004 ~ 0.005S, 0.010 〜0.015V, 0.025 ~ 0.035Ti, 0. 012 - 0. 018Alt) is 55% hot metal + scrap- 100 EAF-LF-VD-Φ500 mm bloom casting-hot rolling to Φ130 mm Round bar. With the process measures including low aluminium deoxidation process- EAF end controlling [C] ≤ 0. 06% and [P] 0. 006% ~0. 010% , adding lime 12 kg/t, AD powder (/% : 10 ~ 13A1, 55 ~ 60Al2O35 - 8SiO25 ~8MgO) 3 kg/t and 70% Al aluminium cable steel 3 kg/t in tapping liquid for pre-oxidation ； using 5. 76 ~6. 06 high basicity Al2O3slag series in LF refining, feeding 0. 40 kg/t calcium wire at end of LF and sift stirring for ^10 min； super-heating extent of liquid in tundish 15 ~25 ℃，using mold and end electromagnetic stirring process in casting, casting speed 0. 31 ~0. 32 m/min and casting bloom slow cooling for "48 h, the steel SA-210A1 steel [O] is 16 x 10-6~24 x 10-6[N] is 65 x 10-6~ 80 x 10-6and [Alt] is ≤ 0. 020% , the macrostructure and nonmetallic inclusions in casting bloom and hot-rolled round bar all meet the requirements.关键词：高压锅炉用钢SA-210Al, 100 t EAF-LF-VD Φ500 mm坯连铸, 低铝脱氧工艺, 高碱度心Al2O3渣系, 生产实践2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of titanium stabilizing austenite stainless steel 321 (/% : 0. 04 ~0, 08C, 0.40 ~ 0.70Si, 0. 80~1.50Mn, ≤ 0.035P, ≤ 0.005S, 17. 0 ~ 18. 0Cr, 9.0~9.5Ni, 0,20~0.40Ti, ≤ 0.0200N) is 90t EAF45 t AOD-LF-180 mm x 1 238 mm slab casting. The "floater" in liquid of steel in mold occurs and the nozzle blocking produces in casting process. Based on analysis on TiN precipitation rule it is obtained that in order to decrease of TiN precipitation in liquid it should be controlled [N] ≤ 0.015 0% , [Ti] ≤0.25% and temperature of liquid in tundish 〜 1 500 °C. With process measures including using extra-pure Ar stirring in whole AOD process, controlling ladle slag thickness 150 mm, [O] 15 x 10-6~20 x 10-6and [N] ~ 110 x 10-6and using shielding slag with basicity 0. 75 and viscosity 0. 165 pa ·s at 1 300 ℃ , the yield of Ti increases from original 40% to 52% , the N content in finished liquid decreases from 0.014 0% to 0.010 5% , the inner diameter of nozzle at finished casting increases from original 42 mm to 50 mm, and the defect of rolled products decreases from original 3. 5% to 1. 2% .2|0|0更新时间：2026-01-21
- 摘要：Based on statistics of process data of IF steel (/% : ≤ 0.002 5C, ≤ 0. 005Si, 0. 01 ~0, 12Mn, ≤ 0. 020P, ≤ 0. 010S, 0. 02 ~0. 04Als, 0. 03 ~0. 05Ti) in steelmaking process, the effect of oxygen content in liquid at Ar station and amount of adding aluminium in RH decarburization period on T[O] , and the effect of alloys adding procedure, top slag modified treatment and shielding casting process on cleanliness of liquid are analyzed. Research results show that the measures including proper increasing the BOF end oxygen content in liquid and temperature of liquid, extending the interval time between Al and Fe-Ti addition, top slag modifying treating and shielding casting process are available to increase the cleanliness of liquid. It is obtained by commercial production that with the average temperature of liquid at initial RH refining increasing by 2. 4 °C , controlling BOF tapping slag amount to decrease the thickness of top slag layer from original 。80 mm to 60 ~75 mm as a result during RH decarburization process the adding aluminium heats decreasing by original 36% to 3% , and with top slag modification to decrease the (FeO + MnO) from original 22% to 17% and increase the continuous-continuous casting heats from 8 heats to 10 heats, the T[O] in liquid in tundish decreases form 37. 4 x 10-6to 21. 6 x 10-6to obviously increase the cleanliness of liquid.2|0|0更新时间：2026-01-21
- 摘要：The production process flowsheet of steel 45CrAlMo (/% : 0. 40 - 0.50C, ≤ 0.60Mn, 0.15 - 0.45Si, 1.30 ~ 1. 70Cr, 0.15 ~ 0. 30Mo, 0. 85 ~ 1.20Al) is 60 t EAF-LF-VD-argon shielding casting 2. 1 t ingot-forged to 120 mm x 120 mm products. The eSect of parameters of deoxidation in EAF steelmaking and LF refining process, VD degassing and continuous casting process on oxygen content and Al2O3inclusions in steel has been analyzed. With the process measures including decreasing S content in liquid at end LF from original <0, 015% to 0. 008% , modifying feeding aluminium wire to adding aluminium ingot, decreasing VD vacuum from 100 Pa to 67 Pa, modifying adding CaSi to non calcium treatment and decreasing casting temperature of liquid from original 1 585 ~ 1 595℃ to 1 570 - 1 580 °C , the macro inclusions are eliminated, the B series and D series inclusions in steel decrease respectively from rating 1. 5 to rating 0. 5, the ratio of nondestructive-testing qualified steel increases from 67% to 98% and the yield of products increases from 55% to 68%.2|0|0更新时间：2026-01-21
- 摘要：At revamping for recover production of 100 t EAF at Anyang Iron and Steel Co the original wall oxygen-fuel burners is replaced by wall three Cojet coherent jet oxygen lances. After revamping and recover production of the 100 t EAF, with charging 80 t scrap + 30 t pig iron the EAF tap-to-tap time is 55 min with power consumption 360 kWh/t and electrode consumption 1. 6 k/t; and with charging 60% scrap +40% hot metal the EAF tap-to-tap time is 50 min with power consumption 225 kWh/t and electrode consumption 1. 2 kg/t to realize EAF low cost and high efficiency running.2|0|0更新时间：2026-01-21
- 摘要：The surface net cracks of Φ 800 mm casting bloom of steel Q345E (/% : 0.15C, 0.27Si, 1. 37Mn, 0. 009P, 0. 001S, 0. 03Nb, 0. 04V, 0. 030Al, 0.008 ON) have been analyzed by metallurgy and scanning electron microscope. It is obtained that the uneven thickness of flux film in between mold wall and solid shell leads to extruding local shell, forming depression, decreasing cooling rate and forming thermal stress cracks. With increasing basicity of mold powder (CaO)/(SiO2) from 1. 03 to 1.15, decreasing melting point form 1 235 °C to 1 210 °C , and increasing viscosity at 1 300 °C from 0. 87 Pa · s to 1. 10 Pa· s, the occurring rate of surface depression and net cracks of 0800 mm casting bloom decreases from original 60. 5% to less than 0. 5%.2|0|0更新时间：2026-01-21
- 摘要：The metallurgical process flowsheet of 280 mm x 380 mm casting bloom of steel 10B21 (/% : 0. 19C, 0.05Si, 0.79Mn, 0.017P, 0. 002S, 0. 17Cr, 0.032Ti, 0.002 0B, 0.025Als) is 100 t BOF-LF-VD-GC. By using Gleeble-3800 thermo-mechanical simulator, the dilatometric curves steel 10B21 with cooling rate 0. 2 〜50 ℃/s has been measured and to combined with thermal dilation method and metallography-hardness method the continuous cooling transformation (CCT) curves are obtained. Results show that with cooling rate 0. 2 〜1 ℃/s the structure of steel is ferrite ( F) and pearlite ( P) ； the cooling rate 5 ~20 ℃/s may be the cooling rate range to form Widmannstatten (W) structure; with >5 ℃，the bainite structure (B) initially occurs in tested steel; with >10 ℃/s, the martensite structure (M) occurs in steel; with > 25 ℃/s the main structure in steel consists of B + M ； and with >50 ℃/s it is obtained M structure in steel.关键词：10B21合金冷镦钢;热模拟;动态连续冷却转变;组织2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of 300 mm x400 mm casting bloom of bearing steel GCrl5(/% ： 0.95 ~ 1.05C, 0.20 ~0. 30Si, 0. 30 ~0.40Mn, 1.40 ~ 1.50Cr) is 120 t BOF-LF-RH-CC-continuous rolling to Φ60 mm products. The effect of high-temperature diffusion time 4. 5 ~ 24 h of casting bloom at 1180 ~ 1260°C on carbide banded structure of Φ60 mm hot-rolled products has been tested. Results show that with increasing holding time the rating of banded structure of hot-rolled products decreases, and with holding time 4.5 ~6.5 h, 6.5 ~ 10 h and ≥13 h the rating of banded structure of Φ60 mm products is respectively 2.5, 2. 0 and 1. 5. It is available based on the requirement on different rating of banded structure to define the corresponding holding time.关键词：GCr15轴承钢;300mmx400mm连铸坯;高温扩散;碳化物带状4|0|0更新时间：2026-01-21
- 摘要：The tested Φ244. 48 mm x 15. 11 mm seamless tube is pierced and hot-rolled by Φ340 continuous rolling mill train from Φ360 mm casting bloom of steel 27CrMnMoV (/% : 0.27C, 0.25Si, 0.92Mn, 1.06Cr, 0.75Mo, 0.009P, 0. 003S, 0.088V). The effect of 830 ~950 °C water quenching, 880 °C. water quenching +600 ~ 680 °C 30 ~ 120 min tempering and 880 °C. double water quenching + 620 ~ 660 °C tempering on structure and properties of the steel tube has been tested and researched. The normal requirement on V150 tube yield and tensile strength is respectively 1 034 〜1 241 MPa and N1 103 MPa, and horizontal impact energy at 0°C≥80 J. Tested results shown that with once quenched + tempered at 630 〜655 °C for 60 min, the Mo and V carbides in steel precipitate to produce secondary hardening, the yield and tensile strength of steel are respectively 1 034 - 1 150 MPa and 1 103 ~ 1 225 MPa, and horizontal impact energy of steel at 0°C is 80 ~ 108 J, while with double quenched + tempered at 635 ~655 °C for 60 min the steel gets fine austenite grains by circle quenching, the strength and toughness of steel increase and improve markedly, its yield and tensile strength are respectively 1 034 ~ 1 170 MPa and 1 103 ~ 1 240 MPa, and horizontal impact energy at 0°C is 80 - 120 J. As compared with once quenching + tempering process the stability control of properties of V150 high anti-collapse casing more easily realizes by double quenching + tempering process.关键词：V150高抗挤毁套管, 27CrMnMoV钢, 两次淬火, 晶粒细化, 性能稳定性2|0|0更新时间：2026-01-21
- 摘要：The studied Cr-Co-Ni-Mo gear steel (/% : 0.05 ~ 0. 15C, 4. 2 ~ 6. 3Ni, 14. 5 ~ 16. 2Co, 4. 2 ~ 6. 4Ct, 3. 8 〜5.3Mo, 0. 8 ~ 1. 5W, 0.1 ~0.4V, ≤ 0.005S,, ≤ 0. 008P, non-adding Nb or adding 0. 01 ~0. 03Nb) is steelmaking by 200 kg vacuum induction melting + vacuum arc remelting process and rolling to Φ50 mm bar products. The testing specimen is solid-solution-treated at 1 050℃ for 1 h and oil cooling, and cold-treated at -80℃ for 2 h , then aging-treated at 560 °C for 7 h. Results show that in steel bearing Nb, Nb microalloy carbon-nitride exists at grain boundary or sub-grain boundary, it has the fine grain strengthening function, as a result with adding 0. 01% ~ 0, 03% Nb the tensile, yield strength and impact energy of steel increase respectively from non-Nb steel 1 850 MPa, 1 598 MPa and 22 J to 2 057 MPa, 1 964 MPa and 33 J.2|0|0更新时间：2026-01-21
- 摘要：The tested steel (/% : 0. 19C , 0. 17Si, 0. 44Mn, 0. 004S, 0. 007P, 0. 041 Als) is melt by a 60 kg vacuum induction furnace, forged to 120 mm x 140 mm billet, rolled to 80 mm X 80 mm billet and rolled to 4 mm X 100 mm product. The effect of finished rolled at 950 °C and 800 °C water and air cooling process on structure and properties of steel has been tested. Results show that the optimum process is beginning rolling at 1 000 °C , two passes of deformation in hot rolling, finished rolled at 800 °C, water cooling with cooling speed 32. 33 ~37. 50°C /s, best process, the performance of low carbon steel with pearlite 89% and ferrite grain size 38nm is up to rating of mushroom upsetting steel grade ML45, the mechanical properties of steel with finished rolled at 950 °C water cooling is up to steel grade ML40 and the mechanical properties of steel with finished rolled at 800 °C air cooling is up to steel grade ML30.关键词：控轧控冷, 铆螺钢;终轧温度;水冷3|0|0更新时间：2026-01-21
- 摘要：The metallurgy flowsheet of developed steel Q460D (/% : 0. 16 - 0. 18C, 0. 42 ~ 0.48Si, 1.40 ~ 1.46Mn, 0.012 ~0. 020P, ≤ 0.005S, 0.11 ~12V, 0.020 ~ 0.050A1, 0.0102 ~0.0139N) is ≥40% hot metal + scrap- 50 t EAF-LF-VD-260 mm x 300 mm bloom casting- hot rolling to 070 ~ 100 mm products. With the process measures including controlling EAF end [C] 07% and [P]≤0.015% , LF refining slag basicity ≥ 3.0, feeding Al and Ca wire, controlling Al 0. 030% ~ 0. 05% and [S]≤0.005% , and feeding manganese-nitride wire before LF tapping, the mechanical properties of steel is stable i. e. yield and tensile strength, elongation and impact energy of steel being respectively 470 - 504 MPa, 576 ~ 695 MPa, 19.0% ~ 27. 5% and 32 ~ 60 J, the qualified rate of nondestructive testing is 93. 7% , and the stability of composition and each performance of steel is high to meet the of high cleanliness, high homogeneity and high stability of properties of steel for auto axle head.2|0|0更新时间：2026-01-21
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