Materials Literature
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By analysis on main metallurgical units- primary melting furnace,refining furnace,vacuum blowing oxygen unite for stainless steel and comparison of process routes- one- step, two- step and three- step steelmaking process route,it is put forward that the corresponding main metallurgical equipment and process route shal…
The each technology parameters in range of carbon 0.58% -0.83%, water ratio in secondary cooling zone 0.82-2.86 L/kg, casting speed 1. 9 〜3.0 m/min and superheating of liquid steel 17 ~ 60 ℃： on center carbon segregation of 140 mm x 140 mm and 150 mm x 150 mm billet has been analyzed at given mould electromagnetic sti…
The spring steel 65Mn was produced by 100 t top and bottom combined blown converter melting- ladle furnace refining- 6 strand 150 mm×150 mm billet concasting. The end point [C] was0.08%～0. 12%,[P]≤0.012% and [S]≤0.03%, and the yield of recarburizer was 85%～90%. During refining the basicity of slag was 2.5～3.0 with fee…
The expansion curves of phase transformation in hot work die steel H13- 0.34C,0.39Mn,0.91Si, 5.11Cr,1.34Mo,0.91V,0.0015S,0.009P with austenitizing temperature 1060 ℃ at different cooling velocity between 20 ℃/s and 100 ℃/h were determined by Gleeble 1500D thermal simulation test machine and the continuous cooling tran…
The magnetic properties of electrical sheet steel including general(≤0.03%C,≤2%Si),oriented and nonoriented(~3%Si )steels increase mainly by steelmaking process- decreasing C(to ~0.003%),0 and N content and controlling inclusion in steel,rolling and heat treatment process. The development trend of electrical sheet ste…
In accordance with optimum revamping of structure of mould copper plats for a 1400mm X 170mm slab con- caster, a numerical simulation for 3- dimensional temperature fields of mould copper plats with two kinds of copper plate and immersed nozzle structure parameters before and after revamping has been studied by finite…
The effect of Al2O3cylinder spinning thread speed on Al2Q inclusion dissolution velocity in refining slag - 4-10 MgO, 34-39 Al2O3), 33 ~ 42 CaO, 3 ~ 9 CaF28 SiQ21.3 - 8.7 SrO and the dissolution velocity constant of Al2O3in slag have been tested and studied by modified viscosity testing device. The results showed that…
A model for energy equilibrium in melting process of vacuum induction melting and the rational electric power supply regulation in each melting period have been derived and got by systematical analysis and calculation on power requirement and loss in melting process of 3 - 6 t vacuum induction furnace and on basis of…
The peak value load of main electric power consumer such as steel works causes to waste electric power re- source, in short supply of mains power and to increase electric cost for consumer. The project of electric load demand side management (DSM)for Xigang Steel make the electric load(demand)to decrease by about 10%-…
The phenomena of oxygen contamination from crucible materials on molten steel during vacuum melting has been studied by a 50 kg vacuum induction furnace with magnesia crucible and a 25 kg vacuum induction furnace with calcia crucible to reseach the basic law and main factors of oxygen contamination from crucible mater…
The 1 mm deep cracks occured at surface of 80~95 mm square bars of 12Mn2VB non-quenching-tempering steel containing 0. 10%～0. 15% C produced by EBT EAF-LF steelmaking-650kg ingot casting with compound casting powder:16~20C,≥10Al₂O₃,35～40SiO₂,10~16CaO at Special Steel Co Lad,Benxi Iron and Steel,and the C cont- ent of…
Besides capacity of electric arc furnace, the production conditions such as chaining, melting steel grade, steelmaking process and production flow sheet influence the determination of rating capacity of transformer for electric arc furnace, It has been obtained by analysis that for ultra-high power (UHP) electric arc…
By revamping to increase mould length and first cooling water flow rate, use active supply secondary water, automatic control of mould liquid level and mould electromagnetic stirring, the output per hour of 240 mm×240 mm concasting bloom increased to 84.67 t from original 64.73 t and casting speed increased to 1.0～1.1…
In accordance with the quality problem of austenite stainless steel during concasting, the taper of mould for 1260 mm×160 mm slab casting at No3 steelmaking shop,Taiyuan Iron and Steel was analyzed. It is obtained that to adopt two taper mould,that is to use larger taper at 80～200 mm near liquid surface and use minor…
According to the solubility product theory of second phase in austenite, Ostward ripening theory, grain size control theory and precipitation strengthening theory, the probability for formation of inclusions in austenite and the inclusion size control have been theoretically analyzed and calculated. The results show t…
The statistics data of charging structure as well as scrap, hot metal and electric pawer consumption per ton steel of two batches 1249 heats of a 50t arc furnace at Shijiazhuang Iron and Steel have been analyzed by using Statistics Package for Social Science (SPSS) software and iron-steel ratio to describe binary char…
A new technology of high efficiency concasting based on inner-outer couple cooling of molten steel in a mould has been advanced that is to set an inner cooling apparatus- U shape pipes in a mould. The flow status of molten steel in mould with inner cooling apparatus is analyzed by using fluid dynamics analysis softwar…
The mechanical alloying is an excellent technology of alloying in solid state witch has good prospects and has been applied successfully to produce nano-crystalline ultrafine grain dispersion strengthened materials,magnetic materials,superconducting materials and nano-crystalline materials. The development and process…
The structure of high stength-toughness spring steel 38SiMnVB -0.39C,1.48Mn,1.21Si,0.09V, 0.0019B was pearlite + ferite with grain size less than No 10,HRC value 26,tensile strength 925～1010 MPa and elongation 45%～58% by finishing rolling between 750 ℃ and 820 ℃ with finished temperature 700~720 ℃ than slow cooling.Af…
The 12%Cr type steels- 1Cr12Mo and 2Cr12NiMolW1V for turbine blades have been pilot produced by 30 t EAF+ VOD-ESR(2~3 t ingot)-825mm mill at Changcheng Special Steel.The results showed that as 1Cr12Mo steel analysis was C 0.13～0.15 ,Cr 11.70～11.90 ,Ni 0.46～0.55 ,Mo 0.34～0.47 and 2Cr12NiMolW1V steel analysis was C 0.22…