最新刊期
卷 28 ， 期 4 ， 2007
- 摘要：Test results showed that the creeps of spring of steel 44Si2CrV quenched + medium tempering and removed decarburized layer happened at room temperature as stress was higher than critical creep stress value, and the higher tensile or shear strength, the higher critical creep stress. The critical creep stress τccof steel 44Si2CrV quenched at 900 P and tempered at 500°C was 700 MPa, τccquenched at 900°C and tempered at 380 °C was 800 MPa. The plastic deformation speed was higher at creep beginning, then decreased abruptly. The creep stopped at certain stress for definite time. After loading for a long time and creep of spring stopped, as the spring was heated at 200 °C for 2 h air cooled, the free height of spring increased, and the creep of spring restarted again when it is loaded with original stress.关键词：弹簧钢;室温蠕变;临界蠕变应力;回复2|0|0更新时间：2026-01-21
- 摘要：The optimum conditions of molten steel to precipitate Ti2O3inclusion in solid-liquid dual phase region during solidification are obtained by study on thermodynamics of deoxidization of pipeline steel X100 (0. 03 ~0. 05C, 1.70 ~ 1. 90Mn, 0. 15 ~0. 25Si, ≤0. 001S, ≤0. 002P) during solidification. The results showed that control of titanium content in molten steel ≤0. 01% , aluminum content ≤0. 002% , oxygen content ≤0. 001% and nitrogen content ≤0. 004% were key factors to promote precipitation of fine Ti2O3particles at front of solidification in solid-liquid dual phase region of pipeline steel X100.2|0|0更新时间：2026-01-21
- 摘要：High temperature mechanical properties of cast billet of CCr15 bearing steel (0.98%C,1.51% Cr) have been tested by using Gleeble-3500 thermal simulation test machine to get that zero plastic temperature (ZDT)of GCr15 steel- 1400 ℃, zero strength temperature- 1450 ℃, optimum plastic temperature range of billet - 1250~950 ℃ and Ⅱ brittle temperature range-950~600 ℃. The fracture morphology of billet at plastic temperature range and brittle temperature range was analyzed by SEM. The study results show that the straightening temperature of cast billet should be controlled ≥950 ℃.关键词：GCr15轴承钢;连铸坯;高温力学性能3|0|0更新时间：2026-01-21
- 摘要：Fluid field of molten steel in mould with 900 mm height for slab continuous casting has been simulated using k-e double equation model under numerical calculation conditions by a 3 dimensional mathematical software CFD to study effect of process parameters of mould on distribution turbulent kinetic energy at liquid level in mould and impact pressure at narrow side of mould. Results showed that for cross section 220 mm x 900 mm slab mould, the molten steel in mould had better flowage condition as immersion depth of nozzle was 180 mm with exit angle 15° and casting speed 1.6 ~ 1. 8 m/min.关键词：板坯连铸;结晶器;湍动能;冲击压力;数值模拟4|0|0更新时间：2026-01-21
- 摘要：The mixing time of steel in a 130t ladle with single nozzle blowing, double nozzle blowing in right angle location and symmetry location with different gas rate was measured by established water model using conductivity method. Results showed that the mixing time with double nozzle blowing was shorter than that with single nozzle blowing and stirring effect was better than that of single nozzle blowing. As nozzle location distance from center of ladle bottom for single nozzle blowing was 0.55R(ladle bottom radius), the mixing time was shortest; and as distance between double nozzle for double nozzle blowing increased from 0.40R to 0.70R, the mixing time obviously decreased.关键词：钢包;底吹氩搅拌;水模型;混匀时间3|0|0更新时间：2026-01-21
- 摘要：The structure, impact toughness and abrasion resistance of steel HM (0.48C,5. 1Cr,2.0Mo,1.0V, 2.0W)and steel H13(0.38C,5. 1Cr,1.4Mo,1.0V) have been tested and researched. Results showed that as the con- tent of W and Mo in steel HM was higher than that in steel H13,more undissolved carbides existed in steel HM to hinder growth of austenite grain to get fine grain, the average impact value increased by 35.5% as compared with steel H13; with high temperature tempering, as more carbides dispersed precipitated from matrix of martensite in steel HM and secondary hardening was obvious, the abrasion resistance increased by 34.8% as compared with steel H13.关键词：Shearing Blade;Steel HM;Alloy Carbides;Impact Toughness;Abrasion Resistance4|0|0更新时间：2026-01-21
- 摘要：The internal stress of worfcpiece of GCrl5 bearing steel 300 mm x 220 mm cast billet during 1 ~ 4 pass of 650 mill with box pass rolling has been simulated by using finite element analysis software DEFORM and the effects of side taper and rolling temperature on stress were analyzed. Results showed that the first pass with minimum l/[(H + h)/2] value was disadvantaged to improve internal quality of steel products； the less side taper the less tensile stress (σx) at width direction ； and the fracture factor of each point during rolling at 1 050 °C. was less than that at 1 100 °C.关键词：650轧机;孔型;GCr15轴承钢;内应力;有限元分析2|0|0更新时间：2026-01-21
- 摘要：The 304L extra-low carbon stainless steel was melted by a 25 kg vacuum induction furnace. The structure evolution of as cast structure of steel after 1 pass equal channel angular pressing (ECAP) at 200 ℃ and the structure of steel with one pass ECAP of as cast structure + 1 150℃ 1.5 h, AC treatment (solid solution structure) then ECAP have been studied by transmission electron microscopy. Results showed that the main deformation mechanism for as cast structure of 304L steel during 1 pass ECAP was slipping with a small number of twinning deformation； while during ECAP of solid solution structure of 304L steel the amount of twinning deformation obviously increased, the slipping and twinning deformation produced together to fine original grain.关键词：304L奥氏体不锈钢;等径角挤压变形;组织5|0|0更新时间：2026-01-21
- 摘要：Tempered martensite can be formed at surface of bar to increase its mechanical properties by higher efficient tube type turbulent flow cooling system after hot rolling of bar products. The temperature field of Φ25 mm Q215 steel bar after hot rolling in turbulent flow process has been analyzed by the finite element analysis software MSC. Marc. Results showed that left turbulent flow system cooling for 1 s the surface temperature of bar decreased from 950.0℃ (finishing rolling temperature) to 768. 0 ℃ and the centre temperature of bar decreased to 861. 2 ℃ ； and as bar was out of turbulent flow cooling system for 3 s the surface temperature increased to 792. 6 ℃. Production application results indicated that the ultimate strength of hot rolled bar cooling by 3 zone turbulent flow cooling was up to 410 MPa while that by normal process cooling was only 310 MPa.关键词：控制轧制, 湍流冷却, 温度场, 数值模拟2|0|0更新时间：2026-01-21
- 摘要：Two dimensional models of rolling process of two-stand Steckel mill at Kunming Iron and Steel has been established using heavy reduction elastic-plastic finite element method (FEM) by finite element software MSC. Marc to simu> late the flatness of 2 mm x 1 200 mm rolled strip of steel C45(0. 43% -0. 49%C). And 3-dimension simulation of stress distribution along strip width direction has been carried out to get the effect of upper/lower roll diameter ratio on strip flatness. Results showed that as roll diameter ratio was 420/418. 5, the strip flatness was optimum.2|0|0更新时间：2026-01-21
- 摘要：The formation and transformation of inclusion in aluminium killed steel during refining have been studied with extra low oxygen steel steelmaking by 140 t LD - LF - RH - CC flow sheet. A sufficient of aluminium was added in test steel during tapping in order to as soon as decrease solution oxygen in liquid steel, and CaO-Al2O3refining slag series containing 3.00% ~ 8.42% SiO2were selected for Al203transforming to calcium aluminate inclusion. Test results showed that the transformation trend of inclusion in liquid steel during secondary refining was pure Al2O3→spinel→CaO - Al2O3-MgO complex inclusions, the transformation of inclusion in heat with slag containing 8. 42% SiO2was slower than that in heat with slag containing 3. 00% SiO2and as CaO/Al2O3of refining slag was 1. 60, most inclusions in steel transformed to low melting point CaO-Al2O3-MgO complex inclusions. The available ingredient of ladle refining slag is 55% - 60% CaO, 35% -40% Al2O35% ~10% MgO.3|0|0更新时间：2026-01-21
- 摘要：Large inclusions and ultra-fine inclusions in 304 stainless steel thin strip produced by twin roll strip casting have studied by scanning and transmission electron microscope. Results indicated that inclusions in thin strip were spheroidal compound oxide inclusions with ingredient CaO-MnO-Al203-SiO2and manganese sulphide inclusion; besides minor 50μm large inclusions, majority of inclusions in thin strip were less than 10 μm fine oxides and sulfides; in contrast to traditional concasting, size of inclusions in thin strip obviously decreased, of which number relatively increased; diameter of inclusions formed in solidification of liquid steel and finally accumulated in grain boundary was mainly less than 0.7 μm.5|0|0更新时间：2026-01-21
- 摘要：The test of desulphurizing by CaO-SiO2-MgO-Al203refining slag with basicity R (CaO/SiO2) 2-7 in a medium frequency induction furnace has been carried out by quadratic orthogonal regression test scheme to establish the mathematical model of relation between ingredient of slag and steel-slag sulfur partition ratio Lfi and examine the effect of slag basicity, slag index MI (R ： Al203) , content of CaF2MgO and FeO on sulfur partition ratio Ls. Results showed that the desulphurizing efficiency of slag with basicity R 3.5 ~5. 0 and slag index MI 0. 25 ~0.40 was better； and the optimum ingredient of refining slag was 9% CaF28% MgO, 13%Al2O3<0. 5% FeO with R =4.4|0|0更新时间：2026-01-21
- 摘要：The service temperature of inner wall of mould at normal conditions is 250～350 ℃, the mould copperplate should have better thermal conductivity and resistance to deformation, higher high temperature strength, surface precision and wear resistance. The service life of Ag-Cu and Cr-Zr-Cu is longer than that of peroxiding copper and pure copper, The effect of plate coating layer of mould is to avoid copper plate forming star-shaped crack, prevent copper permeating cast billet and increase lubrication and wear resistance of mould. At present main adopted plate coat materials are Ni+Cr,Ni-Co and developed new alloy coating materials. The characteristics and application status are analyzed in this paper.关键词：连铸结晶器;铜板;镀层3|0|0更新时间：2026-01-21
- 摘要：The outer layer of clad pipe is carbon steel such as grade B(L245),X42(L290),X52(L360),X60 (L415),X70(L485),and the inner layer is 18-8 type austenite stainless steel or ferrite-austenite dual phase stainless steel. The cladding process, anti-corosion technology of pipe outer surface, welding process of pipe and properties and ap- plication of bimetallic clad pipe are presented in this paper.关键词：碳钢-不锈钢复合管;双金属复合工艺;焊接2|0|0更新时间：2026-01-21
- 摘要：The 0.5 mm×480 mm 50W1300 non-oriented electrical steel sheet 3t (0.04～0.06C,0.82～0.96Si, 0.35~0.40Mn,0.015~0.017P,0.014~0.019S) has been researched and produced by using 40 t LD converter ·180 mm×495 mm slab concasting-continuous rolling flow sheet. The molten steel temperature was controlled between 1650 ℃ and 1670 ℃ and the oxygen content in steel decreased from72.9×10-6to 22.9×10-6by argon blowing in ladle. The electromagnetism properties and mechanical properties of pilot produced cold rolled non-orientation eclectic steel all met 50W1300 requirement of GB/T2521- 1996 being suitable for manufacturing rotor of small motor.2|0|0更新时间：2026-01-21
- 摘要：The microstructure and composition of fracture during cold drawing failure of wire coil of SWRH82B stell (0.80~0.84C,0.75~0.85Mn,0.18～0.22Cr,0.015～0.035Al) produced by 280 mm×380 mm casting slab have been observed and analyzed by scanning electron microscope and energy spectrometer. It is obtained that carbon rich con- centration,oxide-sulphide inclusion and microvoid are failure crack initiation of wire coil during cold drawing. The cold drawing quality of SWRH82B steel wire coil shall be insured by using electromagnetic stirring technology at end of secondary cooling zone to control inclusion, composition segregation and structure of casting slab.关键词：SWRH82B钢;铸坯;碳偏析;夹杂物;盘条冷拔断裂3|0|0更新时间：2026-01-21
- 摘要：The φ25～160 mm round bars of gear steel 20CrMnTiH-0.20～0.22C,0.25～0.31Si,0.93~ 1.00Mn,1.03~1. 15Cr,0.05~0.08Ti were pilot-produced by 120 t converter- 130t LF+RH-280mm×380mm bloom concasting - hot rolling process at Panzhihua Steel. The examination results showed that oxygen content in steel was (10~20) ×10-6average14×10-6), hardenability(J9J15) band width - △HRC value≤7; mechanical and structure all met the requirement of standard GB/T5216-2004.2|0|0更新时间：2026-01-21
- 摘要：With revamping such as advancing oxygen lances and using modifying process such as charging hot metal for 3 sets of 40 t arc furnace (transformer capacity 15 MVA/set)at Xincheng Special Steel, the tap to tap time of arc furnaces decreases to 60~70 min from original 3 h, electric consumption decreases to 160 kWh/t with oxygen consumption 50 m3/t, electrode consumption2.0 kg/t, and the annual output capacity of3 furnaces is up to 850000 t. The operation practice showed that the optimum economical index of 40 t arc furnace was got with 20~25 t hot metal charging per heat.2|0|0更新时间：2026-01-21
- 摘要：The longitudinal crack with 0.3 mm depth occurred in φ11.5 mm cold drawn products of low carbon high sulphur free cutting structural steel (0.07C,0.86Mn,0.06P,0.32S) to product some batches of rejection. The analysis results by sampling indicated that the rating unit of banded structure in φ14 mm cold drawing blank was up to 4 and the section reduction in cold drawn one pass was up to 32.52% which led to crack formed in cold drawing. With overheat control of molten steel during casting, finishing rolling temperature increasing to 1050 ℃ from 850 ℃ during continuous rolling of cold drawn blank, spraying cooling and 650 ℃ self tempering, the rating unit of banded structure of φ14 mm cold drawing blank decreased to less than 1.5,moreover the section reduction in cold drawn pass decreased to less than 30.5%,thereby the longitudinal crack in Φ11.5 mm Cold drawn products was avoided.2|0|0更新时间：2026-01-21
- 摘要：Main oxygen lances of a 100 t UHP EAF at Nanjing Steel are door carbon oxygen lance and wall small oxygen lances, furnace charging consists of 40 t pig iron and hot metal and 70 t scrap, and total oxygen consumption before optimization of oxygen blowing procedure is 43~45 m3/t. Optimum test results showed that in condition with constant of the amount of (pig iron + hot metal), according to different charging amount of metal to adopt different oxygen supply rate, it was available to increase overall utilization of oxygen, the average total oxygen consumption decreased to 38 m3/t.2|0|0更新时间：2026-01-21
- 摘要：The cold rolled tube φ51 mm×6 mm and φ60 mm×6 mm of T91(10Cr9MolVNb)steel piot produced by gcrap + DRI+ pig iron- 100t UHP EAF-LF(VD)-CCM(EMS) φ210 mm round billet-hot rolling tube φ89 mm×7 mm -cold rolling process at Tianjin Pipe. The continuous cooling transformation curves of overcooling austenite and mechanical properties of produced T91 steel tube were examined. Results showed that due to addition of V(0.20%)and Nb(0.09%)and control of N content in steel(0.032%),the mechanical properties of T91 steel tube at ambient and 200～600 ℃ met to requirement of standard ASME SA-213M.2|0|0更新时间：2026-01-21
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