Materials Literature
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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…
The steel QStE380TM-0.04~0.08C,0.20~0.35Si,1.20~1.35Mn,≤0.015P,≤0.010S,0.015~0.025Nb,0.005～0.015Ti 6~12 mm hot rolled plate for auto beam has been researched and produced by hot metal pretreatment - 210 t top and bottom combined blown converter - LF refining - two strand vertical-bending concaster(65 mm slab)- 6-stand…
The smelting of stainless steel has been developed by using powder injection process for desiliconization, dephosphorization and desulphurization of hot metal with pretreatment device,a 30 t EBT UHP EAF for smelting iron alloy and partial scrap, a 75 t K-OBM-S top and bottom combincd blown converter and VOD refining a…
The effect of Ca-Si and FeS adding order in Ca-treatment process and Ca/S ratio for steel on morphology and quality of sulphide in 0.048%～0.065% S medium-carbon steel(0.46～0.57C,0.83～0.94Mn,0.21～0.24Cr, 0.03~0.04Mo)has been studied by a carbon tube fumnace in laboratory.the results showed that the length and quantity…
A technology of inner-outer couple cooling of molten steel in mold for 1 240 mm x 200 mm slab concasting i, e, to set an inner cooling apparatus- U shape pipes has been advanced to enhance efficiency of heat transfer and improve flow of molten steel. The flow status of molten steel in the inner-outer couple cooling mo…
Based on operation process parameters of tundish for two strand concasting 1500 mmx 250 mm slab,using Eulerian multiphase model,porous media model and Larangian random-trajectory model,the characteristics of molten steel flow and inclusion moving trace in tundish with turbulence inhibitor and gas blowing curtain techn…
The structure,strength and impact toughness of linepipe steel X80-0.04C,1.87Mn,0.27Mo,0.06Nb, 0.006V,0.017Ti were tested and compared with linepipe steel X70.The exarination results showed that as structure of the linepipe steel X80 was acicular ferrite + fine dispersed bainite,the steel had better stength and toughne…
The liquidus temperature of steel 0,14% ~ 0.76% C, 0.48% - 1.48% Mn containing 0.0009% ~ 0,003 0%Ca and steel 0,15% ~ 0.63%C, 0.56%~1.32%Mnfree Ca has been measured by differential thermal analysis method (DTA) , With comparison between analysis value and calculation value, it is obtained that the average influence co…
The development of are furnace steel in China and world as well as the resource and energy characteristics for scrap stcel-electric are furnace steelmaking flow sheet are analyzed,it is obtained that this flow sheet is beneficial to recycle economy and environmental protection.The ratio of arc furnace steel output to…
The bearing steel GCrl5 is produced by 60 t converter -60 t ladle furnace(LF)- 150 mm×150 nm billet concasting process at Shijiazhuang Steel. The process practice showed that the oxygen cortent in steel was effectively controlled by catch carbon practice with average converter end [C] 0.30%,improving process to contro…
The cold upsetting steel is produced by hot metal pretreatment - LD- ladle argon stiring process. It is obtained that the multi- elements compound inclusions in steel lead to cold upseting crack of steel based on analysis of structure and inclusions of cold upsetting crack of 0.23C-0.69Mn steel for rivet by scarning e…
The wearing condition of Φ600 mm×2000 mm CVC roll made of 3.50C- 1.20Si- 1.20Mn-2. 10Cr-4.50Ni- 0.80Mo high chromium high nickel casting iron has been measured in site at CSP hot rolling mill, Lianyuan Steel. The results showed that the roll wearing presented typical box shape,the effect of temperatture on roll wearin…
The evolution law of magnetic induction of traveling wave stirer developed for the concasting slab was determined by using 3- dimensional Gauss meter in laboratory. The test results showed that the magnetic induction of developed two-side stirrer linearly increased with increasing input current at given input frequenc…
The ingredients,characteristics and forming accounts of typical defects - scale-shaped outer-overlap,entraped slag outer-overlap and dregs pit of steel 36Mn2V N80 oil pipe were analyzed. The occured rate of N80 oil pipe typical defects decreased to less than 2% from 5%~6% and tube product yield increased to 86.65% fro…
The hot continuous rolling process of 効00 mm Hll steel round bar for mandrel has been simulated and studied by using MSC. MARC 3- dimensional thermo-mechanical coupled elasto-plastic finite element method (FEM) and contact analysis technique. It is obtained by analysis that with decreasing last pass roller speed Vr th…
The effect of VOD bottom blowing location and blowing rate on mixing time of molten steel was studied by a water model corresponding to 1/9 volume of the 75 t ladle with oval cross section at Taiyuan Steel.The test results showed that the available blowing rate for model was 1.1~1.3 m³/h coresponding to flowing rate 3…