Materials Literature
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The structure evolution of grain-oriented Si steel (%:0.04C,3. 16Si,0.50Cu) with main inhibitor Cu2S and low temperature slab reheating in 650~1050 ℃ high temperature annealing process has been studied by orientation distribution function and metallographic observation. Results show that the primary and secondary recr…
Hereditary feature of original coarse grain of steel OOCrl INil IMoTi rolled at 1 150 °C and solid-solution treated at 780 ~900 °C has been studied. Results show that there is a critical temperature Ac for the steel, at which the austenite renews nucleation and the heredity of coarse grain do not carried out; the Ac o…
The effect of gas bubble size, injection rate and blowing time on removal of hydrogen and inclusion in liquid steel during refining has been studied and analyzed by theory calculation. A large number of bubbles form in liquid steel as the argon gas injection through porous brick. Small bubbles are available to increas…
Developed status of steels for nuclear reactor pressure vessel at home and abroad is presented including re- querulent for analysis and properties, metallurgical process, heat treatment, and present situation of manufacture and application. The developed trend of steels for nuclear power station is discussed, as the s…
Water modeling test for a 25 t four-strand tundish with bottom blowing gas has been carried out by using porous plug with different performance parameters and combined with RTD curves and standard deviation analysis to study the effect of porous plug area (210 ~ 105 mm x 56 ~28 mm), 4 gas blowing location and gas rate…
According to the present status of research and development of high strength non-quenched and tempered cold heading steel at home and abroad, the chemical composition, characteristics of process, structure and mechanical properties of 800 ~ 1200 MPa high strength non-quenched and tempered cold heading steels are analy…
Effect of oxygen lance nozzles, lance level, top blowing rate and bottom blowing rate on bath mixing time, penetrating deptht impact area and splashing amount has been studied by orthogonal design test using 1： 6.35 water model for a 50 t top and bottom combined blown converter at Tang steel. Results show that as comp…
The studied steel 0Cr15Ni5WMoVNb(%:0.068C,14.54Cr,5.32Ni,0.88W,0.92Mo,0.20V, 0. 10Nb)is melted by 5 t medium frequency induction furnace+2 t vacuum electro-slag remelting furnace,then forged and hot rolled to φ45 mm bar products,and the test specimens solid-solution-treated at 1000 ℃ for 30 min +cold-treated at -70℃ f…
The X70 pipeline steel (% ： 0. 02 - 0. 05C, 0. 145 〜0. 25Si, ≤0. 015P, Wt). 002S, 1. 70 ~ 1. 80Mn, 0. 085 ~ 0. 15Nb, 0. 2 - 0. 3Ni, 0. 015 ~ 0. 040Al, 0. 01 ~ 0. 03Ti) is produced by hot metal pretreatment - 120 t converter - RH - LF - (200 ~ 250) mm x (900 ~ 1 800) mm slab concasting process. With metal manganese to…
Structure and mechanical properties of steel !Crl2Ni3Mo2VN quenched at 1 010 °C for 1 h, oil cooling and double tempered at 580 ~620 °C for 1 h, air cooling have been studied. Test results show that in tensile specimen tempered at 620 °C ,a large amount of coarsening block M23C6carbides precipitate at boundary of temp…
The numerical simulation on distribution of temperature field,stress field and displacement field of copper mould wall with 10 mm thickness for casting liquid of 0.2% C steel has been carried out by using finite element analysis software ANSYS/thermal,with comparison to get the safety of serious service part of mould…
Structure and mechanical properties of steel 20SiMn3NiA normalized at 860 ℃, oil quenched at 900 ℃ for 40 min and tempered at 180~650℃ for 90~150 min have been studied. Results show that the better tempering temperature of steel is 200~250℃,the lath martensite, fine slim rod precipitated carbide and residual austenite…
Charged weight for the 70 t arc furnace is 80-81 t including direct reduction iron hot briquette (HBI) 14.6-15.2 t and hot metal 23-27 t, its tapping liquid amount is 77-78 t, electric power consumption 316 ~ 324 kWh/t, oxygen consumption 29.7-33. 0 m3/t and tap-to-tap time 48 ~54 min. Steelmaking practice shows that…
Drill Pipe is main component part of oil drill-stem, its service environment is extremely severe and stress conditions are very complicated. The development trend of overseas drill pipe products is presented from both development of drill pipe grades and connector including ultra-high strength drill pipe, sour service…
The effect of temper rolling (0~3.3%) and natural aging on mechanical properties and bake-hardening performance of 0.7 mm ultra-low carbon bake-hardening steels plate (%:0.0030C,0.008Nb-0.003Ti,0.0030N and 0.0030C,0.012Nb-0.012Ti,0.0042N) annealed at 830 ℃ has been studied. Results show that at beginning with in- crea…
Effect of 0.09%~0. 14% C content on structure and mechanical properties of 2Mn-0.003B-0.05Ti micro- alloying steel cold drawn with 5%~50% reduction and aged at 100~500 ℃ for 2 h has been studied. Results show that with lower carbon content (0.09%~0. 12%C), the finer and uniform distributed granular bainite structure i…
The simulation of temperature field, stress-strain field and rolling force of stock during 10 passes finishing rolling process from Φ16 mm rolling to Φ5. 5 mm wire of steel 42A (0. 39% ~0. 46% C) has been carried out by analysis on heat transfer in high speed continuous rolling process at steel works and by means of e…
Hot plasticity of U71Mn steel(%:0.75C,1.20Mn) and U75V steel (%:0.75C,0.94Mn,0.05V, 0.005Al) at 700~1300℃ has been studied by using Gleeble- 1500D thermo-simulation machine. Results show that as vanadium carbo-nitride precipitates at grain boundary and inside, the hot plasticity, especially the plasticity at Ⅲ brittle…
The effect of deforming temperature 800 ~950 ℃ on structure and mechanical properties of steel 55SiCrA (% ： 0. 56C, 1. 42Si, 0. 68Cr) for auto suspension spring has been studied by Gleeble-1500 thermo/mechanical simulator and using optical, electron microscopy and mechanical property test. Results show that with incre…
The math model for erosion-corrosion of liquid steel-inclusion two-phase flow in tundish on refractory has been established and the numerical calculation to erosion-corrosion characteristics of refractory in tundish with turbulence inhibitor, dams and weirs is carried out. Calculated results show that the position wit…