最新刊期
卷 38 ， 期 4 ， 2017
- 摘要：Tested steel 31CrMoV9 (/% : 0.28 ~0.33C, 0.30 ~0.35Si, 0.49 ~0.60Mn, 0. 011 ~0.016P, 0.027 ~ 0.031S, 2.47 ~2.60Cr, 0. 16 ~0.23Mo, 0. 12 ~0. 19V) is melted by a 25 kg induction furnace, and the effect of binary basicity 2.5 ~ 3.5 of different ingredient refining slag (/% : 46.43 - 59. 89CaO, 15.16 - 23.50Si0210 〜20Al2O36 〜 10MgO, 2 ~5CaF2) on number, size and composition of inclusions in steel 31CrMoV9 has been studied by orthogonal experiment method. Results show that the effect of binary basicity and alumina content in refining slag on inclusion content in this steel is obvious ； as the binary basicity of slag increases from 2.5 to 3.5, for per 0.3 mm2steel the average area of inclusions increases from 22.07 μm2to 25.67 μm2i. e. that increases by 16.31% and the number of inclusions decreases from 316.67/0.3 mm2to 255.00/0. 3 mm2i. e. that decreases by 19. 47% , it is available to form composite inclusions； as alumina content in slag increases from 10% to 20% , for per 0. 3 mm2steel the area of inclusions increases from 22. 57 μm2to 24. 28 μm2i. e. that increases by 7. 55% and the number of inclusions decreases from 292. 67/0.3mm2to 272.00/0.3 mm2i. e. that decreases by 7. 06% , it is available to form aluminium-magnesium spinal inclusions. With comprehensive analysis the refining slag contained 10% Al2O310% MgO and 5% CaF2with binary basicity 3.5 has better refining effect.关键词：31CrMoV9钢, CaO-SiO2-Al2O3-MgO-CaF2系精炼渣, 碱度, Al2O3, , ;夹杂物2|0|0更新时间：2026-01-21
- 摘要：The tested steel 32CrNiMoNb (/% ： 0.32C, 0. 30Si, 0. 30Mn, 0.012P, 0. 004S, 1.25Cr, 1.20Ni, 0. 36Mo, 0. 05Nb) is melted by a 200 kg vacuum induction furnace and cast to 130 mm x 135 mm billet. And in laboratory the billet is rolled to 12 mm plate by a 550mm medium-heavy mill using two stage controlling rolling and cooling and direct- quenching process. The effect of beginning rolling temperature (950°C and 1000°C ),finishing rolling temperature (900°C and 950°C ) and direct-quenching end cooling temperature (150~350 °C ) at second stage on structure and mechanical properties of tested steel has been tested. Results show that at second stage with beginning rolling at (950 土 10)°C , finishing rolling at (900 ± 10)°C and direct-quenching end cooling temperature (250 土 10)°C , the matching of mechanical properties (Rp0.2- 1 515 MPa, Rm- 1 805 MPa, A- 8% and at -40 °C impact energy KV2- 24 J) and bending performance (180° ) of plate, structure (fine martensite) and precipitated phase ( NbCN) is best.2|0|0更新时间：2026-01-21
- 摘要：Based on the principle of similarity, a water model with geometric similarity ： 3 for 120 t ladle in steel is established. The effect of argon conditions of single and double porous brick ( porous location, blowing gas rate 0. 4 ~ 2. 0 m3/h, etc) on mixing time to define ladle bottom blowing process parameters has been tested. The experimental results show that with single porous block layout as the porous block layout at bottom 0. 63R (R- radius of ladle bottom) , the mixing time of liquid is shortest ； for double porous block layout, increasing the distance between two porous block is favorable to reduce mixing time, the mixing time of double porous blocks in 180° angle and at 0. 6R is shortest； with same gas flow rate, the effect of double porous blocks is obviously better than that of single porous block.关键词：120t 钢包;底吹氩;单、双透气砖;吹气量;水模型;混匀时间2|0|0更新时间：2026-01-21
- 摘要：The lesser slag steelmaking process of 150 t BOF by using green dolomite to replace partial lime and magnesia granule is carried out at Shiheng Special Steel, and the safety of heel slag remaining operation is improved by using optimizing " slag splashing + slag adjusting" process; with reasonable slag forming schedule, blowing scheme, adding suitable slag foaming agents and controlling slagging point, the dephosphorization rate of liquid is about 60% and the slagging rate is about 50% to effectively ensure the BOF steelmaking end-point, and the each index gets optimization i. e. the consumption of lime decreases to 30. 2 kg/t from 46. 7 kg/t, the consumption of light burned magnesia granule decreases to 8. 7 kg/t from 13. 3 kg/t, the consumption of oxygen is 47. 7 m3/t and the iron and steel material charging decreases to 1072. 1 kg/t from 1075.3 kg/t to realize steelmaking with safe, lesser slag and low cost.6|0|0更新时间：2026-01-21
- 摘要：The process flowsheet for high strength steel 82B (/% : 0. 79 ~0. 83C, 0. 15 〜0. 25Si, 0. 72 -0. 80Mn, ≤0.020P, ≤0. 015S, ≤0. 15Cu, 0. 18 ~0. 30Cr) is BOF-LF-165 mm x 165 mm billet casting-hot rolling to Φ 12. 5 mm coil-cold drawing to Φ5. 05 mm products. It is obtained by analysis on cold-drawn fracture of wire rod that the factors including obvious martensite at center of wire rod and network of cementite produced by segregation, large size MgO-CaO-Al203- SiO2compound inclusions and surface defects lead to cold drawn fracture of wire rod. With the process measures including decreasing the overheating extent of liquid from original 25 ~35 °C to 15 ~25 °C , decreasing the billet casting speed from 1. 80 m/min to 1. 65 m/min, decreasing the amount of secondary cooling water from 0. 80 L/kg to 0. 65 L/kg, increasing the soft argon blowing time from 10 min to 12 min and insuring aging for 3 h at 250 ℃ after rolling, the rating of center porosity ,center segregation and shrinkage cavity of casting billet decreases respectively from 1. 5, 1. 0 and 0. 5 ~ 2. 5 to 0. 5 , 0. 5 and 0 ~ 0. 5, and the total content of inclusions in steel decreases from 0.0035% 〜0.0043% to 0.0017% ~ 0.0021% to basically avoid the occurrence of cold drawn fracture of wire rod.2|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of steel P80R flat products (/% ： 0. 15C, 0.25Si, 1. 70Mn, 0. 012P, 0.002S, 3. 01 Ni, 0. 34Mo, 1. 07Cu, 1. 10AI) is 110 t LD-LF-RH-casting 4. 2 t ingot-breakdown 150 mmx615 mm slab-rolling to 60 mm x610 mm flats. It is obtained by examination and analysis that the Ni and Cu is seriously enriched near the cracks, the Ni content and Cu content in area near cracks are respectively up to 32. 55% ~ 33. 53% and 7. 97% 〜8. 86% , and the enrichment of Cu leads to surface grain boundary oxidation to form cracks, therefore the Cu content in steel, slab heating temperature and time should be controlled. By the process measures including decreasing Cu content in steel from 1.07% to 0. 92% , Al content in steel decreasing from 1. 10% to 0. 88% , increasing Ni/Cu from 2. 7 to 3. 3, reducing heating time at 1100 ~ 1140 ℃. from 30 ~50 min to 20 ~30 min and slab peeling treating, the occurrence rate of surface cracks of mirror plastic die steel P80R flats decreases from 70% to ≤0.5%.2|0|0更新时间：2026-01-21
- 摘要：An analysis on width to thickness ratio of flat ingot at home and abroad has been carried out to get the effect of width to thickness ratio on quality of ingot. And the 60 t flat ingot with large width to thickness ratio and large water-cooling mould casting equipment are developed. The casting test of 61 t flat ingot with width 3 070 mm, thickness 1 022 mm, width to thickness ratio 3. 0 and casting temperature 1 580℃ of steel Q345B (/% : 0. 19C, 0. 36Si, 1. 39Mn, 0. 010P, 0. 003S) steelmaking by EAF-LF-VD process and rolled to 220 mm heavy plate has been carried out. Results by non-destructive testing and sampling analysis show that the quality of ingot is better； the heavy plate mechanical properties are yield strength 348 ~373 MPa, tensile strength 562 ~588 MPa, impact energy at -40 °C 40. 76 ~88・80 J, elongation 17. 00% ~28. 50% , Z direction reduction of area 33. 79% -60. 88% and rating of grain size 8 ~9 to meet the requirement of standard ； and the non-destructive testing results of heavy plate meets the requirement of JB/T4730-2005I -grade detection of defect. The commercial test shows that the technology of flat ingot water-cooling mould for large width heavy plate has the ability to provide bloom for high quality extra-heavy plate.关键词：601扁钢锭模, 锭型设计;宽厚比;特厚板;水冷模;性能2|0|0更新时间：2026-01-21
- 摘要：The process flowsheet of 1. 2 mm cold-rolled sheet of steel DC04-LQQ (/% : ≤0.003 5C, ≤ 0.02Si, 0. 08 ~0. 20Mn, ≤ 0. 015P, ≤ 0. 012S, 0. 02 ~ 0. 06Als, 0. 06 ~ 0. 08Ti,≤0.0040N) is hot metal pretreatment-250 t BOF-RH-slab casting-hot-rolling- cold-rolling- annealing at 820 -840 °C. The analysis on surface defects of deep-drawing piece of steel DC04-LQQ for filter has been carried out； the results show that the main surface defects are tongue-shaped and pinhole-shaped defects, the tongue-shaped surface defects containing O, Al, Mg and Fe etc elements are formed by Al2O3and MgO inclusions in liquid and the pinhole-shaped surface defects containing K, Na, Ca, Al and Ti etc elements are formed by entrapped mold powder in condition of large fluctuation of mold liquid surface. With the measures including increasing holding time of liquid from original 20 min to 30 min, extending the interval between adding Al deoxidizing and adding alloys from 1 ~2 min to 4 min in RH refining, optimizing tundish argon blowing scheme and revamping the tundish cover argon pipeline, and increasing the tundish argon pipe diameter from original 20 mm to 34 mm, the occurring rate of surface defects of steel for filter decreases from original 7. 78% to 2. 62% to get obvious effect.2|0|0更新时间：2026-01-21
- 摘要：With using the process measures including modifying the low basicity (2. 6) CaO-Al2O3-SiO2slag series to high basicity ( ≥5. 0) CaO-Al203-SiO2-CaF2slag series, increasing the [Als] in steel before LF refining from 0. 02% ~ 0. 03% to M 0. 06% , improving the atmosphere casting to box type Ar shielding casting and improving the 3t ingot body casting time from 6 ~8 min to 4 ~5 min, the [O] and [S] in cold-working die steel Cr12MoV are respectively [O]≤ 18 X 10-6and [S]≤ 0. 005% , and the comprehensive products yield increases from 74. 35% to 80. 12%.2|0|0更新时间：2026-01-21
- 摘要：The flowsheet of one stop process for steelmaking stainless steel at Xingsteel is hot metal dephosphorizing- slag skimmigs-AOD-LF-CCM. The effect of reducing slag basicity 1. 5 ~2. 2 on yield of manganese and the effect of nitrogen content in steel 0Crl2Mnl5NiCuN on de-nitrogen of steel by blowing argon process are analyzed, it is obtained that with controlling the slag basicity 2. 0 ~ 2. 3 the manganese yield is more than 97 % , and with blowing nitrogen in decarburizing period and reducing period, as blowing 60 〜80 m3argon in 58 t liquid after end reducing period, the nitrogen content in liquid may control between 0. 18% and 0. 25%. 60 t AOD production results show that as compared with " EAF + AOD” two step mode the total cost for production of steel 0Crl2Mnl5NiCuN by using AOD direct charging dephosphorized hot-metal one step mode decreases by 500 yuan/t.关键词：0Crl2Mnl5NiCuN不锈钢;60 t AOD; 一步法;锰合金化;氮含量控制;工艺实践2|0|0更新时间：2026-01-21
- 摘要：With 100 t LF original refining end slag (/% : 53. 8CaO, 8. 16MgO, 16. 6SiO2, 17. 45Al2O31. 44TFe, 1. 26S, ZG. 08) to improved refining end slag (/% : 51.3CaO, 6. 36MgO, 25. 0SiO26. 73Al2O32. 96TFe, 0. 76S, R2. 05) by decreasing the basicity and Al2O3content in slag, the equivalent number of inclusions in steel 65Mn (/% : 0. 63 ~ 0. 65C, 0. 19 ~ 0. 22Si, 0. 92 ~ 0. 96Mn, 0. 005 ~ 0.006S, 0. 021 ~ 0. 022P, 0.003 5 ~ 0.003 7T [O]) decreases from 18. 4 incluisons/mm2to 11. 3 inclusions/mm2and the average diameter of inclusions reduces from 8. 4 μm to 4.5 μm. As compared with original refining slag by using optimized refining slag the number of Al2O3per mm2in steel 65 Mn at LF end refining decreases from 5. 9 to 1. 7; and the Al2O3content in CaO-SiO2-Al2O3and CaO-SiO2-Al2O3-MgO compound inclusions decreases from 38. 3% ~ 44. 7% to 17. 5% ~ 28. 7% ； and the reject rate of coil due to unqualified B series Al2O3inclusion decreases from 6% to 3%.2|0|0更新时间：2026-01-21
- 摘要：Effect of factors including sulfur alloying process and slag series on casting performance of steel GS35C-A (/% : 0. 32 ~0. 39C, ≤0. 40Si, 0. 50 ~0. 80Mn, ≤ 0. 045P, 0. 015 ~0. 055S, ≥0. 020Al) has been analyzed, and the original LF (sulfur alloying)-RH-calcium treatment process is modified to optimized LF-RH-calcium treatment-sulfur alloying process. Results show that with using calcium treatment after sulfur alloying process, in casting the main nozzle blocking materials are CaS and CaO-Al2O3-CaS complex inclusions ； as using sulfur alloying after calcium treatment process the number of continuous-continuous casting heats increases from original 2 heats by using calcium treatment after sulfur alloying process to 6 heats; and with using optimized slag series (R 5. 66 ~9. 55) , before RH feeding sulfur wire the number of micro-inclusions in steel decreases by 84% as compared with original process, and the number of micro-inclusions at end RH decreases from 9. 09 inclusions /mm2to 5. 06 inclusions /mm2.4|1|0更新时间：2026-01-21
- 摘要：The effect of 0. 75% ~ 1. 54% Mn on structure and properties of 4)16 mm hot-rolled coil of medium-carbon cold-heading steel (/% : 0.45C, 0. 22Si, 0. 75 ~ 1. 54Mn, 0. 007 ~ 0. 008P, 0. 003 ~ 0.004S) has been analyzed and studied. The end-rolling temperature of hot-rolling coil is 880 X., slow-cooling. Results show that with increasing manganese in steel from 0. 75% to 1. 54% , the tensile strength of coil increases from 661 MPa to 821 MPa, i. e. that increases by 160 MPa； the percentage of ferrite in structure of steel decreases from 49% ~53% to 9% 〜13%, the pearlite content in structure increases obviously and the pearlite lamellar spacing reduces from 0.5 μm to 0.25μm ； and the hardenability of steel improves significantly, that is the hardenability coefficient o£ steel increases from 3. 19 mm to 8. 81 mm.关键词：锰含量;中碳冷镦钢;热轧盘条;组织;力学性能;淬透性4|0|0更新时间：2026-01-21
- 摘要：The designed tested steels (steel 0.45C-12. 5Cr-0. 41 Mo-0. 22V and steel 0. 85C-10. 5Cr-0. 91 Mo-0. 25V) are melted by a 50 kg vacuum induction furnace and forged to tested specimen. The effect of quenching temperature (950 ~ 1 150 ℃)，tempering temperature (once tempering at 200 ~ 400 ℃. and double tempering at 500 ~ 600 ℃)on structure, strength, elongation, hardness and impact energy of steels is tested and studied. Results show that the properties of steel 0.45C-12.5Cr-0.41 Mo-0. 22V quenched at 1 050 ℃+ double tempered at 500 ℃ are best： tensile strength 1712.3 MPa, yield strength 1 476.5 MPa, elongation 7. 8% , HRC hardness value 69. 3 and impact energy 7. 3 J. The hardness value of die steel increases by secondary hardening, but during tempering process the carbides in steel grow up with uneven distribution easily led to impact toughness of steel decreasing. The strength index of tested new stainless die steels is high than that of normal commercial die steel 42Gr3 Mo2MnVl.关键词：纸模制品;0-45C-12.5Cr-0.41Mo-0.22V不;锈钢模具;淬火;回火;力学性能2|0|0更新时间：2026-01-21
- 摘要：The 0. 5 mm cold-rolled sheet of non-oriented silicon steel (/% : 0. 003C, 0. 58Si, 0. 20Mn, 0. 010P, 0. 002S, 0. 25Al, 0.003 ON) is cold-rolled by 2. 6 mm hot-rolled plate. The effect of recrystallized grain rate in sheet annealed at 390 ~ 820 °C on magnetic performance, tensile strength and hardness of the steel has been studied. Results show that before crystallization of steel (annealed at 390 ~ 480 °C) , the effect of annealing temperature on tensile strength and hardness of steel is minor; as recrystallized grain rate is ≥70% (annealed at 560 ~820) , decreasing annealing temperature is available to effectively increase tensile strength of steel while deterioration of steel's magnetic performance is no-obvious ,but has no-effect on hardness of steel; as recrystallized grain rate is less than <70% (>480 ~<560℃) , with decreasing annealing temperature the steel's magnetic performance deteriorates sharply, but the tensile strength and hardness of steel increase obviously; as the steel anneals temperature at 560 °C with recrystallized grain rate 70% , the comprehensive properties of non-oriented silicon steel are best i. e. tensile strength Rm470 MPa, HV1 hardness value 140, iron loss P1.5/507. 5 W/kg and magnetic pole intensity 1. 70 T.6|0|0更新时间：2026-01-21
- 摘要：The effect of end-rolling at 905 ~ 930 °C , air cooling, end-rolling at 905 ~ 930 ℃，cooling to 675 ~ 707 ℃ by crossing water, and end-rolling at 845 ~ 870 ℃, cooling to 661 ~698 °C by crossing water on carbide network in Φ36 mm hot-rolled bar of bearing steel GCr15 has been tested and studied. Results show that the rating of carbide network in bearing steel GCrl5 bar air-cooling after rolling is 3, higher than requirement, the rating of carbide network in bar cooling to 661 ~707 ℃ by crossing water after rolling is 1. 5 ~ 2. 5 to meet the requirement for bearing steel GCr15 for cold working service ( rating of carbide network 2. 5) ； and the carbide network in hot-rolled products of bearing steel GCr15 may be obviously improved by finishing rolling at lower temperature and decreasing end rolling temperature.6|0|0更新时间：2026-01-21
- 摘要：The production flowsheet of developed 0. 020% ~ 0. 060% S steel XGML40Cr (/% : 0. 38 ~ 0. 44C, 0. 17 ~0. 30Si, 0.60 ~0. 80Mn, ≤0. 035P, 0. 020 ~0. 060S, 0. 90 〜1.1OCr, ≤ 0. 01A1) for drill bit at Xingsteel is 50 t BOF-LF-285 mm x320 mm bloom casting-hot-rolling to Φ12 mm wire rod. The cutting test on 0. 027% S steel XGML40Cr and 0. 006% S steel ML40Cr with cutting feed rate 0. 015 mm/r, depth of cut 0. 1 mm and cutting speed 12 〜30 mm/min has been carried out. Test results show that the cutting performance of steel XGML40Cr is better than that of steel ML40Cr, i. e. its turning chip length is 1/5 ~ 3/5 that of steel ML40Cr； the heat productivity of steel XGML40Cr during cutting process is lower than that of steel ML40Cr, its blue turning chip ratio is 10% but that of steel ML40Cr is up to 70% ； and the cutting deformation coefficient of steel XGML40Cr is lower than that of steel ML40Cr and its surface roughness ( Ra 10. 2μm) is better than that of steel ML40Cr (Ra 22. 4μm). The mechanical properties of steel XGML40Cr is about equal to that of steel ML40Cr, its mechanical properties quenched at 870 °C and tempered at 500 ℃ are tensile strength 1 082 MPa, reduction of area 70% , HRC hardness value 40 and impact energy Akv272 J.2|0|0更新时间：2026-01-21
- 摘要：The tested steel Cr22Mo 200 mm cast slab is heated at 1 150 °C for 150 min, hot-rough-rolled with 7 passes- finishing rolled with 7 passes to 4. 0 mm hot-rolled coil, annealed at 980 ~ 1 030 °C and cold-rolled to 0. 8 mm sheet and annealed at 950 〜1 020 °C. The effect of finishing rolling temperature 850 °C and 800 on structure, texture and formability of steel Cr22Mo has been tested and studied. Experimental results show that with decreasing finishing rolling temperature the structure of cold-rolled sheet fines, the recrystallized texture increases, the average plastic strain ratio r value increases and the plane anisotropy Ar value decreases, therefore the formability of cold-rolled sheet markedly improves by decreasing finishing rolling temperature.关键词：超纯铁素体不锈钢Cr22Mo;4 mm热轧板;0.8 mm冷轧板;终轧温度;成形性;织构2|0|0更新时间：2026-01-21
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