Materials Literature
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The effect of water ratio in secondary cooling zone on billet cooling speed, solidification structure and center carbon segregation index of 0.64% ~ 0.82%C steel 150 mm x 150 mm billet casting with 250A/5Hz electromagnetic stirring has been tested. The results showed that with water ratio in secondary cooling zone inc…
The development of production of tools for rock drill in China and present domestic market condition of rock drill tools for handheld rock drills, tools for hydraulic rock drill vehicle, connected rod for pneumatic drill vehicle and tools for down-the-hole drill are summarized and analyzed. It is indicated that high s…
The effect of B₂O₃ on melting temperature and complete melting time of 40.5%～70.0%CaO- 19%~ 45%Al₂O₃-SiO₂-MgO- CaF₂ pentary slag series by semi- sphere point method has been studied. The test results showed that the average melting temperature of pentary slag with 40.5%~60%CaO,2%～10%CaE₂and(B₂O₃)/(CaF₂) 0. 17~0.33 was…
Simulation of liquid steel feeding system of pool in a twin roll 2~3 mm thin strip concaster with roll diame- ter 1200 mm,wide 380 mm and pool depth 460 mm at Nanchang Steel and evaluation of nozzle structure has been carried out by using 1:2.4 ratio dynamic physical model.The nozzle size structure was optimized by or…
A systematic mathematical model group has been developed to simulate the billet section temperature distribution,austenite structure evolution and products properties. "Die prediction system for structure and properties is established based on the sub-models determined by test including critical model, austenite recry…
The φ18 mm high strength spring steel 60Si2CrVAT(0.57C,1.65Si,1.04Cr,0. 13V)was produced by 100 t EBT EAF-LF(VD)- 300 mm×320 mm billet casting process at Xingcheng Special Steel. The S+ P content in finished steel was ≤200×10-6and average oxygen content ≤12×10-6.Because the V carbon-nitride couldn't be dissolved compl…
The spring steel 60Si2Mn(A)was produced by an 150 top and bottom combined converter - 150 t ladle furnace(adding Al 1.2kg/t, Ba alloy 1.0 kg/t, Ar stiring, feeding SiCa wire)- 165 mmx165 mm billet concaster.The oxygen content in steel at end phase of ladle furnace was (15~25)×10-6and residual aluminium was 0.020%～0.03…
It is obtained by analysis that the edge cracks occur during bending and straightening of strip due to 70 mm thin slab horizontal plane non-homogeneous cooling and edge over-cooling during production of SS400 steel strip Coil with irrational secondary cooling water rate led to precipitation of AIN in austenite and gra…
The quenched and tempered structure, mechanical properties and corrosion resistance of two Cr17Mo type corrosion resistant stainless steels for plastic mould-0.39C,0.70Ni,16.73Cr,1.07Mo and 0.53C,1.05Ni,16.87Cr,0.96Mo have been tested and researched. As the carbon content in Cr17Mo type steel increased from 0.39% to 0…
Based on thermodynamic function of hot metal predesulphurizing reaction and desulphurizing reaction rate, the conditions beneficial to hot metal predesulphurization was analyzed. The test of lime-based hot metal predesulphurization was carried out by a 10 kg medium frequency induction furnace with stepless speed chang…
The low carbon low silicon aluminum killed steel ML08Al(%:≤0.08C,0.20～0.50Mn,≤0.06Si, 0.02Al)was produced by 83 t top-bottom combined blown converter - 83 t ladle furnace - 6 strand 150 mmx 150 mm billet concaster process at Baotou Steel. The operation practice showed that the aluminum content in steel was regularly 0…
The morphology and formation of surface and internal crack of 304 stainless steel 1200 mm×2 mm casting strip produced by twin-roll concasting process were tested and analyzed by scanning electron microscope(SEM). Due to adopting high thermal conduction copper mould, the surface and interal cracks with length up to 140…
The technology measures such as optimiing parameters of tundish,adopting control flow device combined shock bowl possessed of roof flange with single dam,using a new typical ascillator with full plate spring resonance model, added a set of externnal electromagnetic stirer are implemented to increase the cleanliness of…
The free cutting steel 12L14(≤0. 15C,0.85~1. 15Mn,0.26~0.35S,0. 15~0.35Pb)is produced by process of 60 t Consteel electric are fumace - alloying during EBT tapping- concasting at Guiyang Stecl. The production results showed that the difference in content of lead at section of cast billet was ±0.02% and the yield of le…
The Φ210~310 mm round tube billet of gas bottle steels such as steel and steel 30CrMo and 37Mn are produced by 150 t EAF- 150 t LF(VD)- CC process at Tianjin Pipe Co.The production statistic data showed that during LF refining using ≥50Si,≥12Ca,≥13Ba alloy to replace total aluminium deoxidization,the [Alt] decreased t…
The P content in molten steel during eccentric bottom tapping of Consteel electric are furnace was ≤0.010% by controlling temperature of molten steel 1560~1590 ℃ and melting with foaming slag in whole period. The oxygen content in bearing steel produced at Guiyang Stecl was(5～11)×10-⁶,average oxygen content was 9×10-⁶…
The precipitate behavior of second phase and structure of 0.08C- 1.0Mn-Nb+Ti<0.10 microalloy high strength steel 1.5 mm sheet deformed by 53% annealed at 650 ℃ and 680 ℃ has been tested and studied by transmission electron microscope. the results showed that the second phase in test steel was(Ti,Nb)(C,N)compound preci…
The viscosity of fluxes was measured by rotational viscometer method with RTW-08 measuring device for properties of matter of molten mass. The test results showed that the fluxing effect of B₂O₃ was equivalent to that of CaF₂ in based slag 46CaO- 10BaO- 11.2SiO₂- 11.6Al₂O₃;and in based slag CaO-SiO₂- 10BaO- 11.6Al₂O₃-…
The CCr15 bearing steel is produced at Laiwu Steel by using foaming slag submerged are operation in whole period of EAF steelmaking,EBT tapping alloying,LF secondary refining slag basicity being 4.0～5.0,main composition of refining slag-45～50CaO,9~13SiO₂,9～13Al₂O₃,7~8MgO,diffusion-deoxidizing by SiC and Ar stiring wit…
By comparison with quenching and tempering steels the non-quenched-tempered steels not only decrease production cost but also can avoid deformation of parts by heat treatment and decrease deviation of mechanical properties. The advance in ferrite-pearlite high toughness non-quenched-tempered steels, bainite and marten…