最新刊期
卷 34 ， 期 4 ， 2013
- 摘要：Thermodynamic calculation and analysis results show that in ordinary- pressure the reaction temperature (T) of carbon-thermal reduction for MgO is 1 854 °C, it is difficult under hot metal pre-treatment condition to realize situ desulfurization by generating magnesium from magnesite-based desulfurizer. As carbon-thermal reduction occurs at 1 250 ~ 1 300 ℃， the vapour pressure of magnesium must be less than 0. 994 kPa, moreover at 1 350 〜1 400℃, the vapour pressure of magnesium should be less than 1. 004 kPa. In thermodynamics adding aluminum powder and Fe2O3 as thermite is available to carry out the carbon-thermal reduction and accelerate the magnesium vapor generation.关键词：菱镁矿;铁水预脱硫;碳热还原温度;发热剂;热力学分析2|0|0更新时间：2026-01-21
- 摘要：In order to study the influence of the thrust/tension (0 ~ 15 MPa) on rolling process of stainless steel (Crl8Ni8, 2 mm thickness tube)/low carbon steel (0. 06% ~0. 12% C, 4>16 mm, round bar) clad rebar, a finite element model for clad rebar rolling process is established by using finite element software Msc. Marc. The influence of thrust/ tension on lateral spread and contact stress of interface of stainless steel/carbon steel clad rebar and circumferential thickness of stainless steel wall is studied by simulation, the key point is to study the thrust rolling on bonding strength of both metals. Results show that with exerting tension the lateral spread of rolling stock decreases but increases with exerting thrust with increasing thrust and decreasing tension the contact stress between clad stainless steel and core carbon steel increases. The thrust rolling is available to bond both metals and increases the bonding strength of clad stainless steel and core carbon steel.2|0|0更新时间：2026-01-21
- 摘要：Finite element simulation on rolling process for 30CrMo steel 350 mm x 450 mm casting bloom with surface 1 150 ℃ and canter 1 240 ℃ rolling to 0230 mm bar products is earned out to study effect of rolling parameters including single pass 10% ~ 30% reduction ratio, double pass reduction 50 mm-50 mm, 10 mm-90 mm and 90 mm-10 mm at total reduction 100 mm on canter density of bar. Results show that with single pass reduction ratio 20% the canter density has definite improvement, and with 30% canter density has obvious improvement ； at total' reduction ratio 100 mm, the improvement of canter density is not obvious by 50 mm-50 mm rolling process, but the improvement of canter density is most obvious by 10 mm-90 mm rolling process. The rolling results at situ are corresponding to the simulation results.2|0|0更新时间：2026-01-21
- 摘要：The deep desulphurization test on low carbon steel (/%: 0. 06C. 0. 20Si, 1. 20Mn, 0. 020Nb, 0. 015Ti) with initial (74 ~ 167) x 10-6[S] is carried out by 20% ~40% high magnesium calcium aluminate premelted slag (/% ： 5SiO2, 37CaO, 42Al2O313MgO, 3FeO) combined with 60% 〜80% synthetic slag (/%: 10SiO261CaO, 25Al2O34MgO) and adding 5 ~ 10 g/kg Al in a 10 kg induction furnace. Results show that during refining the sulfur content in liquid decreases to lowest value in 10 min, with gradually increasing oxygen activity in liquid and decreasing sulfide capacity of slag in refining process the sulfur distribution ratio between slag and liquid decreases and the phenomenon of definite resulphurization in liquid occurs ； the larger aluminum addition, lower initial sulfur content in liquid and higher sulfide capacity of slag are favorable for desulphurization reaction and to inhabit resulphurization ； the desulphurization effect of 20% high magnesium calcium aluminate +80% synthetic slag is better and with controlling refining slag ingredient (/% ) 50 ~ 60CaO, 5 ~7MgO, 28 ~32Al2O3~ 8SiO2and adding 3 g/kg Al the sulfur content in steel could decrease to 0. 001 6%.5|0|0更新时间：2026-01-21
- 摘要：With using Setsys Evolution synchronous thermal analysis system the thermodynamic process of reaction of MgO-C-S (FeS) on 3 kinds of scheme- (1 ) magnesium oxide + carbon powder + sulphur , ( 2 ) magnesium oxide + carbon powder + ferrous sulfide and (3 ) magnesium oxide + carbon powder + ferrous sulfide + aluminum powder + hematite (Fe2O3) with heating rate 10 ~25 °C/min nitrogen atmosphere at 1 350 ℃ has been tested and researched to get differential thermal-thermo gravimetric curves. Results show that the reaction temperature of MgO-C-FeS system is lower than that of MgO-C-S system, and with adding thermite in MgO-C-FeS system the reaction of system shall be moved up.关键词：MgO-C-S(FeS)反应过程;氧化镁;脱硫;热分析7|0|0更新时间：2026-01-21
- 摘要：The flow sheet of production for carbon and alloy structural steel, mooring chain steel, bearing steel, spring steel and HSLA steel at Huaigang is 80 t converter-90 t LF-100 t RH-wire feeding-Φ 380 ~Φ600 mm round bloom CC process. With 40 t tundish, auto control of liquid level in curved tube type mold, water spraying + fine spraying secondary cooling, M-EMS + F-EMS electromagnetic stirring and casting speed 0.3 ~0.8 m/min, the annual production capacity of round casting bloom is L 2 million ton. The characteristics of equipment and relative process optimum including tundish, mold, electromagnetic stirring and secondary water cooling and the improvement of round bloom metallurgical quality are presented in this article.关键词：特殊钢;大型圆坯;连铸;装备;特点;工艺实践2|0|0更新时间：2026-01-21
- 摘要：The flow sheet for production of 2 mm ribbon steel Q195L (/%, ：≤0. 08C, 0.05 ~ 0.10Si, 0.30 ~ 0.40Mn, ≤0. 035P, ≤0.035S) is 80 t converter-ladle alloying and soft argon blowing-150 mm x 150 mm billet casting ribbon steel rolling process. Analysis on edge crack ribbon steel results by using optical, scanning electron microscope and energy dispersive spectrometer show that there are FeO and reticular cracks at crack region. With the process measures including controlling the oxygen content in liquid decreasing io ≤60 x 10-6from original ≤80 x 10-6increasing argon blowing time from ≥ 3 min to ≥ 5 min, decreasing overheating extent of liquid in tundish to 15-25 ℃ from original 25 ~ 35℃ difference in temperature of both side of heating furnace ≤40 °C , decreasing distance between water cooling -nozzle and increasing reduction of first pass edging rolling by 2 ~ 5 mm, the occurrence of the edge cracks of hot-rolled ribbon steel are avoided to get nice production effect.关键词：Q195L窄带钢;边裂;沿晶裂纹;工艺实践2|0|0更新时间：2026-01-21
- 摘要：An analysis on the products of 1215 low carbon high Sulphur free-cutting steel (/%: 0. 05 ~ 0. 10C, W 0.013Si, 1.06 ~1.33Mn, 0. 051 -0.061P, 0. 24 ~0. 36S, 0.012 0 ~0. 014 0[O], 0.005Al) produced by domestic 100 t EAF-LF-CC, 80 t, 100 t and 160 t BOF-LF-CC four process production line is carried out. Results show that the control characteristic of domestic 1215 low carbon high Sulphur free-cutting steel is to control Mn/S (3. 7 - 3. 9) of steel by suitable increasing Mn content in steel and for individual flow sheet is by decreasing S content in steel to get Mn/S =4. 4； the inclusion control of inclusion in steel produced by 160 t BOF flow sheet (Mn/S =3. 8, fluctuation of MnS inclusions area and length/width ratio are comparatively smaller) is better than that by others； due to smaller segregation of elements in casting billet and suitable controlling of cooling rate after rolling the steel produced by 80 t BOF flow sheet and 160 t flow sheet has no obvious banded structure, but by 100 t EAF flow sheet and 100 t BOF flow sheet the rating of banded structure is 3 ~4.2|0|0更新时间：2026-01-21
- 摘要：The steelmaking flow sheet for boron steels such as 23 ~ 40MnB and 27MnTiB etc is 50 t EAF~LF + VD-CC process. It is available to increase the yield of boron to more than 90% by controlling EAF end [C], preliminary deoxidation by adding carbon powder, steel-cladding aluminum and silicon-manganese at tapping and before LF refining the solution oxygen in liquid ≤20 x 10-6controlling LF refining slag basicity 23. 5 and feeding aluminum wire to control LF end (FeO) + ( MnO) ≤ 1.5% and (SiO2) ≤15%, LF end [Al] ≥20%, feeding steel-cladding titanium to control [Ti] 0. 030% ~ 0. 050% and feeding cladding silicon-calcium wire to control the morphology of inclusions in steel, and before VD degassing treatment, bottom-blowing argon stirring and adding ferroboron or feeding cladding boron wire.2|0|0更新时间：2026-01-21
- 摘要：An analysis on cracking and perforation defects occurred in 230 ~ 400 mm plates rolled from 28 ~40 t ingot of low carbon steel S355JR and S355J2 (/% ： 0. 17 ~0. 20C, 0. 30 ~0. 55Si, 1.40 - 1.60Mn, W0.020P, W0.015S, 0. 020 ~ 0. 040Al, 0. 020 ~0. 030Nb) is carried out. With the optimum process measures including increasing level of operation crews, controlling ingot body and hot top casting speed according to overheating extent of liquid, controlling refining end [O] ≤ 25 x 10-6and aluminum content in steel 0. 020% 〜0. 040%, the ingot qualified ratio by nondestructive testing increases to 96. 8%.关键词：低碳钢;28 ~40 t大型钢锭;厚板;轧板开裂;穿孔缺陷;工艺优化2|0|0更新时间：2026-01-21
- 摘要：In desulphurization slag skimming process, the hot metal of different heats shall be brought into slag pot, led to freeze together and hard to break up, in view of this situation a new partitioning agent-lamination material (/%: 6 ~ 15SiO220 ~35 CaO, ≥50MgO, 5 ~ 15FeO) is developed and manufactured by using waste material in steelmaking system at No2 Steelmaking Plant. With using this lamination material not only the treatment of desulphurization slag is easier but also the yield of slag iron increases to 92% from original 10%, and the environmental pollution is lightening.关键词：脱硫渣;分层;隔断剂2|0|0更新时间：2026-01-21
- 摘要：According to existing metallurgical quality issue for production of non-quenched and tempered steel MnVS series including low yield of sulfur, poor casting characteristics and low qualified ratio of steel products in nondestructive testing, with stable sulfur wire feeding speed 80 ~ 100 m/min, using premelted refining slag, slag basicity ≥3. 0 by adding lime in refining and optimizing casting and rolling parameters etc. the average yield of sulfur is up to 84%, carbon segregation extent decreases, first qualified ratio of macro-, micro-structure and heading upsetting of products is respectively up to 100%, 99. 10% and 100%, the products quality and comprehensive properties all meet the requirement of user.2|0|0更新时间：2026-01-21
- 摘要：The production flow sheet of non-quenched and tempered steel S38MnSiV (/%: 0.41 ~0.45C, 0.55 ~ 0.70Si, 1.40~1.55Mn, ≤0.025P, ≤0.025S, 0.10 ~ 0.20Cr, 0.11 ~ 0.15V, 0.012 0 ~ 0.020 ON) is 40% hot metal + scrap-100 t EAF-LF-VD-160 mm x 160 mm ~260 mm x 340 mm CC process. With controlling arc furnace tap end [C] 0.15% ~ 0.30%, tapping [P]≤0. 012%, tapping temperature 1 640 ~ 1 680 °C, refining by high basicity slag, controlling aluminum content in liquid, after VD feeding manganese-nitride wire to control nitrogen content in liquid etc. process measure, the 8 heat steelmaking results show that oxygen content in steel- [O] x 10-6-11 x 10-6[H]1.2 x 10-61. 5 x 10-6and [N] 135 x 10-6- 180 x 10-6for the Φ140 mm round bar products rolled from 260 mm x 340 mm casting bloom with normalizing at 880℃ for 120 min, airflow cooling and tempered at 580℃ for 240 min air cooling, the tensile strength Rm is 870 ~925 MPa and the yield strength Re] is 560 - 605 MPa, its metallurgy quality all meets the requirement of standard.关键词：S38MnSiV非调质钢, 100 t EAF-LF-VD-CC流程, 工艺实践2|0|0更新时间：2026-01-21
- 摘要：The forming cause and fracture mechanism of pen-tip shaped fracture of Φ12.5 mm SWRH82B steel (/%: 0. 80C, 0. 74Mn, 0. 22Si, 0. 013P, 0. 008S) wire rod is analyzed by optical microscope, scanning electron microscope and energy dispersive spectrometer etc. to get the main causes of formation of pen-tip shaped fracture are center carbon segregation and poor network cementite. With using optimum process measures including controlling 120 t converter end [C]30. 20%, controlling [C]0. 79% ~0. 81% in LF refining process, in 150 mm x 150 mm billet casting controlling liquid over heating extent ≤25 °C, casting speed 1.5 m/min, weak secondary cooling water ratio 0. 30 〜0. 45 L/kg, mold end electromagnetic stirring 3.5 Hz and 300 A, controlling and rolling temperature 900 〜930 ℃, wire rod exiting temperature 〜750 °C with cooling speed 〜5°C/min, the average carbon segregation index of casting billet decreases form original 1. 15 to 1.08, equiaxed ratio increases from 20% to 35%, sorbite ratio increases from 85% to 90%, rating of network cementite decreases to less than 2 and the percentage of pen-tip fracture decreases from original 20% to 3%.关键词：SWRH82B盘条;笔尖状断口;网状碳化物;中心碳偏析;工艺改进2|0|0更新时间：2026-01-21
- 摘要：The production flow sheet for developed 20 mm low-cost niobium-titanium-boron microalloying low carbon steel plate (/% : 0. 06C, 0. 40Si, 1. 60Mn, 0. 010P, 0. 005S, 0. 050Nb, 0. 012Ti, 0. 002B) is 130 t top and bottom combined blown converter-LF-RH-250 mm slab casting-4300 mill rolling-direct quenching-tempering process. With end rolling ≥ 900 °C, >20 °C./s direct quenching and tempering at 500 ℃ the tensile strength Rmof the 20 mm steel plate is 855 MPa, yield strength Rp0.2771 MPa, elongation A 16% impact energy AKV2at 0 °C 217 〜238 J and impact energy 4KV2 at -40°C137 〜181 J. Tempered structure of the steel is fine bainite lath with width 0. 5 ~ 1. 0μm and there are lots of dispersed 30 ~90 nm Nb + Ti carbo-nitride precipitates.关键词：800 MPa低合金高强钢, 铌-钛-硼微合金化;钢板;直接淬火;回火;贝氏体2|0|0更新时间：2026-01-21
- 摘要：The forging of steel 30CrMoA (/%: 0. 30C, 0.21 Si, 0. 53Mn, 0. 003S, 0. 005P, 0. 98Cr, 0.22Mo, 0. 06 V) for Desander is a tubular stock with outside diameter Φ405 ~493 mm and inside diameter Φ90 - 167 mm and in specification the transverse impact energy of quenched-tempered steel at -40 °C is ≥20 J. With conventional normalizing + quenching+ tempering process: 920 ℃ normalizing (fan cooling) +880 °C normalizing (fan cooling) +860 ℃ quenching (air cooling + water cooling) +630 ~680 ℃ tempering ( air cooling) the transverse Rmof steel is 715 ~815 MPa, Rp0.2545 〜665 MPa, A 19% ~20% , Z 65% ~68% , ambient Akv36 ~ 101 J and -40 %： Akv11 ~21 J； with equilibrium phase diagram calculated by Thermo-calc software and calculated Ac3value of steel t the optimum normalizing + quenching+ tempering process has been defined that is 950 °C normalizing ( fan cooling) + 820 ℃ quenching (air cooling + water cooling) + 660 ~670 ℃ tempering (air cooling) , and with the optimum process the transverse mechanical properties of steel are Rm685 〜700 MPa, Rp0.2500 〜525 MPa, A 21% 〜22% , Z63% 〜66% , ambient Akv65 ~ 114 J and -40 °C Akv23 〜28 J, all meet the requirement of specification for the steel.2|0|0更新时间：2026-01-21
- 摘要：The 2. 9 mm hot rolled 3% Si high grade non-oriented silicon steel plate (/% ：0. 004 6 C, 3. 04Si, 0. 32Mn, 0. 49Als, 0. 004S, 0. 013P, 0. 004 2N) is produced by CSP ( Compact Strip Production) flow sheet i.e. 120 t BOF-70 nun CC-hot rolling process with end rolling at 872℃ and coiling at 683℃.The analysis results on structure and inclusions in casting slab and hot rolled plate show that the structure of slab is typical trans-columnar crystal, the structure of hot rolled plate at edge is recrystallized grain and in center of plate is fibrous structure with minor recrystallized grains ； and the main inclusions in high grade non-oriented silicon steel are A12O3AIN and Cu2S + MnS in costing slab and A12O3, AIN, AIN + MnS and Cu2S + MnS in hot rolled plate.2|0|0更新时间：2026-01-21
- 摘要：The test alloy GH706 (/% : 0.034C, 16.l0Cr, 41. 13Ni, 1.64Ti, 2.93Nb, 0.39Al) and modified alloy (/% : 0.027C, 16.30Cr, 1.79Ti, 2.05Nb, 1.21 Al) are melted by a 200 kg vacuum induction furnace and remelted to 150 kg ESR ingot, then homogenizing-treated at 1 180 ℃T for 16 h and forged to Φ15 mm rod and heat-treated at 980 ℃ for 3 h, cooling with 4 K/min to 820 °C for 2 ~ 10 h, air cooling, and at 720℃ for 16 h, furnace cooling. Results show that increasing Ai content and decreasing Nb content in alloy contribute to precipitates of γ′ phase in alloy; precipitation of η phase at grain boundary can be controlled by adjusting the time of secondary heat treatment led to the excellent strength and plasticity combination of alloy, i.e. as alloy has tensile strength level 1 200 MPa the reduction of area of alloy is near to 30%. As the secondary heat treatment process is at 820 ℃ for 2 h, the tensile strength of modified alloy at 700°C is 908 MPa and the reduction of area is up to 54. 8%.关键词：Alloy GH706, Al-Nb, 700 °C, γ′Phase, η Phase, Tensile Strength2|0|0更新时间：2026-01-21
- 摘要：Test steel 508-3 (/% : 0. 19C, 0. 26Si, 1.48Mn, 0. 009P, 0. 007S, 0. 78Ni, 0. 50Mo, 0.003Al) is melted by a vacuum induction furnace and cast to 50 kg ingot, forged at 1 150 to Φ16 mm bar, end forging ≥900℃.The effect of normalizing temperature (900 ~ 1 200 °C) and multi-normalizing process (900 〜1 200℃ 1 h-900℃ 1 h-890 °C 1 h) on austenite grain size of steel 508-3 has been studied. Results show that as normalizing at 900 ~ 1 200 °C, with increasing normalizing temperature the austenite grain size of steel coarsens obviously, the rating of austenite grain coarsens from No 6. 5 to No 3 ； with subsequent secondary normalizing at 900 °C the original course austenite grains in steel are refined to rating of No 6, then with third normalizing at 890 °C the effect of refining of austenite grains is not obvious. Multistep- normalizing treatment is available to refining the coarse austenite grains of steel 508-3, but repeating normalizing at same temperature is not obvious to refining the austenite grains in steel.2|0|0更新时间：2026-01-21
- Technical support is provided by Beijing Founder electronics co., LTD 鄂ICP备2022000839号
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
- Total Visits：35684
0