Materials Literature
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The effect of 10% pre-deformation on aging dynamic behavior of an ultra-low-carbon-bainitic steel 0.042~ 0.045C- 1.43～1.48Mn-0.30～0.33Si-0.70～0.73Ni-0.29～0.30Mo-0.025～0.029Nb-0.011～0.019Ti,0.0013~0.0023B containing 0.98~2.90Cu at temperature 450 ℃ and 550 ℃ for 1~104min.The test result showed that the peak hardness of…
The heat transfer behavior and temperature variation rule of molten steel during RH-MFB secondary refining process was analyzed and a model for forecasting temperature of molten steel has been established to simulate the actual process by a programmed software. The forecasting results of temperature of 9 heats molten…
Φ12~60 mm bar products of CCr15 bearing steel are produced by a 70 t high impedance UHP EAF-a 80 t ladle refining furnace-5 strand 150 mm×150 mm billet concaster flow sheet at Huaigang Co Lad. The statistical results of 36 heats bearing steel production data showed that with the process operation such as electric arc…
The effect af V content in compound addition of 0. 14~0.31V-0.05Nb on structure and properties of ferrite heat resistant steel 0. 11C- 11.89~12. 19Cr- 1.86～1.90W-0.37～0.38Mo-0.9Cu has been studied.The research results found that with V content increasing,the volume fraction of δ ferrite in steel increased,while the te…
The causes of surface cracks formation of H beam of Nb-V microalloying steel BS55C-0. 14~0. 17C,0.45~0.55Si,1.25~1.45Mn,0.08～0. 10V,0.03～0.05Nb have been analyzed. The results showed that the steel was sensitive to longitudinal crack at solidification and its plasticity at 700~950 ℃ was lower,therefore,the cracks were…
The oxygen content in concasting billet has been controlled less than 20×10-⁶ in condition of non-vacuum treatment with 55 t LD-60 t LF melting flow sheet at Shijiazhuang Iron and Steel by the operation measures such as controlling LD blowing end-point carbon:low carbon steel 0.08%～0. 10%C;medium carbon steel 0. 10%～0…
The CCr15 bearing steel is produced by a 90 t EBT arc furnace-LF(VD)-240 mm×240 mm billet concasting process at Beiman Special Steel. The statistic results showed that with using 4.46 high basicity slag series,deoxidant containing 32.8% Al,VD vacuum treatment for 25 min and controlling [Als]≤0.030%,the oxygen content…
The grain size,texture,iron loss and magnetic induction of 0.5 mm 0.003C- 1.6Si non-oriented silicon steel cold rolled sheet annealed at 850~1000 ℃ have been studied.The test results showed that with annealing temperature increasing the average grain size increased from 23 μm at 850 ℃ to 115 pm at 1000 ℃,the iron loss…
The as cast structure and forged structure and mechanical properties of semi-high speed steel 16Cr5D- 0.50~0.56C,0.36～0.39Mn,0.95～1.03Si,5.34～5.68Cr,0.31～0.41Ni,1.00～1.04Mo,0.29～0.30V quenched at 880～1060 ℃ and tempered at 200~750 ℃ melted by a 20 kg medium frequency induction furnace has been tested and studied. The…
The solidified film structure, mineralogical phase and crystallization rate of 1537 mm×67 mm mould pow- der(34.6CaO,28.6SiQ₂,8.8C,8.5F,8.6Na₂O)for Compact Strip Production(CSP)have been studied by optical and scanning electron microscope and X-ray diffraction analysis. The results showed that most of the solidified fl…
The flow heat transfer and solidification process of 70L molten steel in a mold for 280 mm x 380 mm billet casting have been numerically simulated by a commercial software CFX4.4 to review the effect of immersed nozzle structure on comprehensive metallurgy effect. The results showed that with increasing immersed depth…
Based on multi-component regression analysis on samples of 800 heats(300 t ladle),the model of predication for temperature of 60 t molten steel in tundish-Ttundhas been established:Ttund=-66.7499+1.03196 T- 0.76824x₁-0.00750x2+0.23253t-0.60624i-9.39124×10-6t³,where T-temperature of molten steel in la-dle arriving at t…
It is available to produce high speed steel by rationally using abundant tungsten,molybdenum and vanadium ore resources in China and comprehensively applying high and advance technologies such as smelting reduction,electroslag remelting and microalloying so as to attain the goal economically utilizing these resources,…
The effect of total reduction ratio 12.5%～46.4% and solid solution treatment at 900~1150 ℃ on the structure and pmoperties of 3 mm sheet of a modifed type 202 metastable austenite stainless steel- 0.04C , 8.18Mn, 15.21Cr , 4.05Ni , 1.65Cu , 0.12N has been studied. The results showed that with 46.4% reduction cold roll…
With electromagnetic brake (EMBr) numerical simulation, the semi-quantitative method to analyze the impact of molten steel to inner wall and initial solidified shell in (900 ~ 1 600) mm x (50 ~ 70) mm mould has been presented .The numerical simulation results showed that with EMBr the impact point of steel flow in mou…
The structure,secondary phase precipitates and mechanical properties of 3 mm plates of 0.0045C-0.07Ti traditional Ti-IF steel contained 0.007P and 0.0052C-0.08Ti high strength Ti-IF steel contained 0.080P,which rolled by 4 pass in ferrite region between 800 ℃ and 680 ℃ from 24 mm plate slab, then annealed at 750℃ for…
K-OBM-S converter is a refining unit for steelmaking of stainless steel by charging hot metal and EAF premelting molten steel* Based on model of top-blown oxygen in converter for plain carbon steel melting and model of AOD process for stainless steel melting, a mathematical modeling of a 80 t K-OBM-S converter for ste…
The steel 9Cr2-0.80~0.95C,0.40Si,0.40Mn,1.30~1.70Cr was laser quenched surface heat treatment by a 3 kW continuous CO₂ cross current laser with laser power 1.8~2.4 kW and laser beam scan velocity 500~1000 mm/min,and the surface structure and the case hardening depth were analyzed and tested. The test results showed th…
Since the nineties of 20 century the thin slab casting-direct rolling and the medium-heavy slab casting-Steckel Mill rolling technologies have been involved in production line of high strength low alloy(HSLA)steel,and in these processes a lot of available operation experiences of thermal-mechanical control process(TMC…
The structure and hardncss of contained Cu high purity steel -0.014C,0. 10Mn,0.05Si,1.18Cu,＜0.002S,0.006P during isothermnal aging at 650 ℃ for 100 s~300 h have been tested and studied by scanning and high resolution electron microscope and HV50 hardhness tester. The test results showed that with aging at 650 ℃,the ri…