Materials Literature
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The composition of macro inclusion in 20MnTiB steel and 45 steel melting by 70 t EAF-LF-CC flow sheet at Egang and ingredient of mold powder and refractory material for concasting process have been analyzed,and it is obtained that the macro inclusion of steel is a composite inclusion which mainly consists of Al2O3MgO,…
The economic-technical indexes and application of a 30 t AOD unit at Pugang,40 t AOD units at Taiyuan Steel and a 120 t AOD unit at Shanghai Nol Steel in China are summarized. The development of AOD refining technology such as decarburization, desulphurization, replacing Ar with N2and top lance technology is presented…
A multi-field coupled analysis on temperature, structure and stress field of 0.21C- 1.03Cr-0.20Mo-0.03Nb gear steel cylinder in quenching process has been carried out by using FEM software MSC. Marc, combined with thermal elastic and plastic models and compiled sub programme. The results showed that the internal stres…
The numerical simulation of fluid field of 70L steel(0.70C)in 280×380×800(mm)mold and molten steel flowage at inner of two-side bole immersed nozzle structure with casting speed 0.8 m/min have been caried out by commercial software CFX4.4.The results showed that as side hole inclination was 10°and 20°,there was second…
The structure evolution of pearlite and overcooling austenite of 0.75C eutectoid carbon steel during com- pression has been studied by Gleeble 2000 and 1500 thermal simulation machines.The test results showed that as sample heated with 10 ℃/s to700 ℃ for 3 min than carried out 60% reduction,the lamellar pearlite in st…
Test low carbon bainitic steel (0.042～0.045C,1.43～1.47Mn,1.0～2.5Cu,0.29 ～0.30Mo, 0.025~0.029Nb,0.011~0.018Ti,0.0013~0.0023B) was melted by a 50kg vacuum induction furnace. Teat results showed that with increasing Cu content from 1.0% to2.5%,the precipitation speed of e-Cu in steel and the peak hardness increased; and…
The macrosegregation law of C,S,P and Al in 240 mm×240 mm cast billet of steel 40Cr(0.38 ~ 0.40C,0.90~0.91Cr,0.015～0.029P,0.009~0.014S)has been studied by the technology of original position statistic distribution analysis(OPA).The study indicated that with 45%～63% equiaxial crystal rate in billet, there has not any e…
The effect of rolling parameters such as 35.0%~52.0% reduction rate in recrystallization region,60.2% ~70.3% reduction rate in non-recrystallization region, cooling rate(20～38 ℃/s)on structure and mechanical properties of0.06C-0.31Mo V-Nb-Ti-B microalloying steel has been studied by Cleeble thermal simulation machine.…
Traditional process to produce electrode of alloy steel 30CrMnSiA1.2 t ESR ingot at Daye Special Steel is EAF+LF-rolling250 mm×250 mm Billet,by which the crack easily produced at top of ESR ingot.With using optimum process to produced ESR electrode:EAF+LF(VD)steelmaking-φ320 mm cast round electrode,controlling≤0.003Pb…
Water modeling experiments and numerical simulation for flow control device of24 t tundish at Chongqing Steel have been carried out to study influence of turbulence inhibitors with different size on fluid flow behavior by measuring residence time distribution (RTD ) curves and removal rate of inclusion s. The results…
With optimized process such as dry masonry brickwork joint ≤0.5 mm,MgO content in magnesium-carbon brick ≥75%,MgO content in refining slag≤20%,VD treating time decreasing from 45 min to 30 min and refining time with low viscosity slag decreasing from 45 min to 15min,the service life of slag line brick in an 100 t LF(V…
Martensite heat resistant steel 1Cr20Co6Ni2WMoV was melted by a vacuum induction fumace with 22.5 kg ingot and forged to 中16 mm bar.Heat treatment process of samples were quenching at 1060 ℃ for 1h oil cooling + cold treatment at -70℃ or- 192 ℃ for 2 h air cooling + tempering at 640 ℃ for 3 h air cooling. Test results…
Based on simulation of molten steel flow field in mold for 150 mm×150 mm billet and analysis on slag inclusion mechanism, the relative process parameters for concasting have been improved including increasing immersion depth of submerged nozzle to 120～135 mm from original 70～80 mm, enlarging lower vent diameter of sub…
With controlling sulphur content in steel≤0.020%,temperature fluctuation range of molten steel of df- ferent heat in tundish decreasing to 10 ℃ from original 25 ℃,adjusting mold water rate to 190～200 m3/h,controling casting rate0.55~0.75 m/min,the intemal crack reject rate for 260 mm×300 mm cast billet of steel 20CrMn…
The1.6～12.7 mm strip of L360 pipeline steel(0.08～0. 12C,0.10～0.25Si,1.10～1.30Mn,≤ 0.015P,≤0.008S,0.03～0.05Nb)was produced by hot metal desulphurization - 120 t converter melting - LF refining (argon stirring,feeding wire)- 160(220)mm slab concasting -2-stand Steckel mill flow sheet.The production data sta- tistic resu…
The deoxidization behavior of magnesium alloy (8% ~ 15% Mg) deoxidizer- AlMg, SiCaBaMg, SiCaBaAlMg to 0. 05% 〜0. 07% C steel has been studied by a 30 kg induction furnace with MgO crucible. Test results showed that with deoxidation using AlMg alloy contained 8% 〜10% Mg the oxygen content in steel decreased to 33.77 x…
0. 14C-0.35N austenite stainless steel 1Mn15Cr17Ni2N melted by 25t EAF-VOD+LF-680 kg ingot process. [N] was 0.040% and [O] was 0.0158% at end of VOD refining, and the analysis results indicated [N] 0. 139% and [0]0.0033% after nitrogen blown for 45 min in LF with blown nitrogen amount 50 m³ with blown nitrogen average…
The surface quality of0.72～0.82C φ5.5 mm wire for steel cord af tyre produced by different producers at home and abroad was tested and examined. The results showed that surface of wire produced at moet producers has no de- carburized layer and average thickness of oxidizing scale layer was ≤7.7 μm with thickness diffe…
The thermal deformation behavior of BH08G welded steel- 0.08C, 1.59Mn, 0. 34Mo, 0.1215 with strain rate ε 0.1~10.0 s-1at 950 ~ 1 050℃ has been studied by Gleeble-1500 thermal simulation machine. It is obtained by regression calculation of austenite recrystallization dynamics that relation between Zener-Hollomon parame…
According to measured solubility data of Thermo-Calc and concerned references, the equilibrium solid solubility formulae of Fe4N in austenite and in ferrite have been derived respectively as log[N]γ= 0.940 -479.4/T and log[N]α= 1.074 - 1 838/T. With considering free energy of Fe4N formation, the equilibrium solid solu…