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Icosahedral coordination of phosphorus in the crystal structure of melliniite, a new phosphide mineral from the Northwest Africa 1054 acapulcoite
Melliniite, ideally (Ni,Fe) 4 P, is a new mineral from the Northwest Africa 1054 acapulcoite. It occurs as anhedral to subhedral grains up to 100 µm, associated with kamacite and nickelphosphide. Melliniite is opaque with a metallic luster and possesses a gray streak. It is brittle with an uneven fracture; the Vickers…
Effect of pH and fulvic acid on sorption and complexation of cobalt onto bare and FA bound MX-80 bentonite
Summary Bentonite has attracted great interest in nuclear waste management because of its outstanding properties. Herein, the sorption and complexation of cobalt on bare bentonite and fulvic acid (FA) coated bentonite are studied, respectively, under ambient conditions. The experiments are carried out at T = 25 ± 2 °C…
Low-temperature mixed spin state of Co3+ in LaCoO3 evidenced from Jahn–Teller lattice distortions
One-phonon and multiphonon excitations of the single-crystalline LaCoO3 were studied using Raman spectroscopy in the temperature region 5–300K. First-order Raman spectra show a larger number of phonon modes than allowed for the rhombohedral structure. Additional phonon modes are interpreted in terms of activated modes…
31P NMR study of Na2CuP2O7: a S=1/2 two-dimensional Heisenberg antiferromagnetic system
The magnetic properties of Na2CuP2O7 were investigated by means of 31P nuclear magnetic resonance (NMR), magnetic susceptibility, and heat capacity measurements. We report the 31P NMR shift, the spin-lattice 1/T1, and spin-spin 1/T2 relaxation-rate data as a function of temperature T. The temperature dependence of the…
Solubilizing single‐walled carbon nanotubes with pyrene‐functionalized block copolymers
Abstract The effect of pyrene distribution within pyrene‐functionalized random and block copolymers on noncovalent polymer/single‐walled carbon nanotube (SWNT) interactions was investigated. The block copolymers served as superior solubilizing agents in comparison with the random copolymers. Also, increasing the pyren…
Industrial Test of High Speed Steel Making in Electric Arc Furnace by Direct Reduction and Alloying with Tungsten Molybdenum Vanadium Oxide Ore
The Industrial test of steel making of high speed steel M2(0.80～0.90C,3.8～4.4Cr,5.50～6.75W, 4.5~5.5Mo,1.75～2.20V)by direct reduction and alloying with scheelite,molybdenum oxide and V2O5ore has been carried out in a 20 t electric arc furnace at Chongging Special Steel.The results showed that the alloying rate was up t…
Trial Production of High Strength Weather-Resisting Steel SPA-H
The low alloying high strength weather-resisting steel SPA-H strip-C≤0. 12,Mn 0.20~0.50,Si0.25~0.75,P0.07~0. 15,S≤0.04,Cu0.25~0.60,Cr0.30~1.25,Ni≤0.65 has been trial-produced by flow sheet of& an 100 t electric arc fumnace-ladle furnace-concaster-rolling mill at Nanjing Steel. The results of examination and service sh…
Absorption Ability of Casting Mold Powder for Al-Killed Steels to Al2O3 Inclusion
Hie Al2O3dissolution rate of casting mold powder CaO-SiO2-Na2O-CaFi-Al2O3-MgO series has been measured by dissolution rate measuring apparatus. Hie inclusion absorption ability of mold powder for Al-killed steels could be predicted accurately by established regression analysis model for relation between Q dissolution…
Development and Application of Magnesia Carbon Taphole Brick for a 60 t Utra-High Power Electric arc Furnace
With basic material -85% first grade magnesia + 15% graphite, adding % Al/Mg(60/40)antioxidant, using solid and liquid phenolic resin as binder and making up according to reasonable grain grading, the magnesia-carbon taphole brick for two sets of 60 t ulra-high power electric arc furnace(UHP EAF)at Fushun Special Stee…
Effect of Pre-Deformation on ε-Cu Precipitation Behavior in Ultra-Low-Carbon-Bainitic Steel
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…
Simulation of Temperature Control of Molten Steel in RH-MFB Secondary Refining Process
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…
Practice of Process for Production of GCr15 Bearing Steel by a 70 t EAF-LF-CC Flow Sheet
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…
Effect of Vanadium on Structure and Properties of Ferrite Heat Resistant Steel T122
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…
An Analysis on Surface Cracks Formation of H Beam of Nb-V Microalloying Steel BS55C
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…
Optimization of 55t LD-60t LF-CC Process to Upgrade Cleanliness of Steel
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…
Effect of 90 t LF(VD)Refining Process on Oxygen Content in Bearing Steel GCr15
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…
Influence of Annealing Temperature on Structure,Texture and Magnetic Properties of Cold Rolled Non-Oriented Silicon Steel
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…
Structure and Properties of Middle Roll of Semi-High Speed Steel 16Cr5D for Cold Rolling
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…
An Analysis on Solidified Film Structure and Mineralogical Phase of Mould Powder for Compact Strip Production
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…