Materials Literature
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The mineral constitution, crystallizing ratio of phase and microstructure of mold flux films for casting ultralow carbon steel SPHC (0. 020% 〜0.055% C, 70mm slab, mold powder /% ： 33. 14SiO23. 86Al2O33. 88MgO, 31. 52CaO, 8. 27K2O + Na2O, 7. 55F-13. 93C), peritectic steel SS400 (0. 18% ~0. 22% C, 70mm slab, mold powder…
Key words:Bearing Steel GCr15,280 mm x 325 mm Bloom Casting,Mold, Multihole Nozzle,Numerical Simulation
Medium carbon sulphur free-cutting steel SAE1144 (/%： 0.42-0.47C, 0.15-0.30Si, 1.45-1.65Mn, 0.24-0.30S, ≤0.025P) is produced by 100t DC EAF-LF-VD-280 mm x320 mm bloom casting process. With process measures including controlling tapping ladle temperature m 1 000adding 200 kg ferrosilicon during tapping, ladle bottom ar…
The metallurgical flow sheet o£ studied heavy rail steel (/% : 0. 68 ~ 0. 73C, 0. 20 ~ 0. 30Si, 1. 05 ~ 1. 15Mn, ≤0.015P, ≤0.012S, ≤O.OO3 5A1, ≤0.000 15[H]，≤0.006 0[N],≤0.002 0 [0]) is metal desulphurization pretreated- 120 t converter-LF-RH-280 mm x 380 mm bloom easting. It is identified by analysis that the casting…
The effect of [N] , [O] and liquid temperature on tantalum yield of steel MHT10Ta is analyzed by commercial test. The results of pilot 9 heats commercial production show that with melting in EAF by oxidation method, deoxidizing in LF by G powder, VOD refining vacuum ≤67 Pa for ≥15 min, VHD heating insuring Al content…
The desulphurization test of pretreated hot metal using four different structure active limes with specific surface area 1.891-2.664 m2/g and average pore diameter 575.5-814.9 nm is carried out in a high vacuum arc melting spinning quenching machine. The surface morphology of different lime sample is analyzed by scann…
The control technology of inclusions in steel for tyre cord and saw wire in "BOF-LF refining-Bloom CC" process is summarily reviewed. The plasticization of inclusions in steel is realized by using the measures including using Si- Mn deoxidation, strictly controlling Als content in liquid and refining with low basicity…
Based on considering the effect of slab steel elastic modulus, thermal conductivity, specific heat capacity and linear expansion coefficient on simulation precision, the simulation of stress field and temperature field of steel Q345C 250 mm x 1500 mm single-piece casting slab during cooling process has been carried ou…
The computer simulation for vacuum casting and solidification process of 39 t ingot of steel 42CrMo4 (/% : 0. 38 ~0. 45C, 0. 90 ~ 1.20Cr, 0. 025Mo) has been carried out by using Any casting software to get that with cast liquid temperature 1 527 °C and superheat extent 40°C the casting time for 39 t ingot is 18.78 min…
Two-dimensional covalent organic frameworks (2D COFs) are crystalline polymer networks whose modular 2D structures and permanent porosity motivate efforts to integrate them into sensing, energy storage, and optoelectronic devices. These applications require forming the material as a thin film instead of a microcrystal…
Since 2008, iron-based superconductors have been the focus of intense research. Unfortunately, the higher transition temperatures and most promising high-magnetic field properties have been associated with compounds that have to be chemically disordered, making it hard to fully understand their intrinsic properties. A…
Raman spectra of few-layer MoSe2 were measured with eight excitation energies. New peaks that appear only near resonance with various exciton states are analyzed, and the modes are assigned. The resonance profiles of the Raman peaks reflect the joint density of states for optical transitions, but the symmetry of the e…
Bond-length distributions have been examined for 55 configurations of alkali-metal ions and 29 configurations of alkaline-earth-metal ions bonded to oxygen, for 4859 coordination polyhedra and 38 594 bond distances (alkali metals), and for 3038 coordination polyhedra and 24 487 bond distances (alkaline-earth metals).…
Shape memory thermoplastic polyurethane (SMTPU) containing isophorone diisocyanate (IPDI) in hard segment has excellent shape recoverability even after large strain deformation. However, the underlying mechanism of shape recovery remains unclear. In this study, 1,4-phenylene diisocyanate (PPDI) in the polyurethane is…
The production flowsheet for cold heading steel 10B21 (/% ：0.18-0.23C, ≤0.10Si, 0.60-0.90Mn, ≤0.030P, ≤0.035S, 0.0008-0.0030B, ≥0.02Al) is 50t top and bottom combined blowing converter-LF-280 mm x 325 mm casting bloom-continuous rolling to Φ12 mm rod products. It is obtained by examination that as nitrogen content in…
Based on the finite element method according to two dimensional solidification heat transfer model, the simulation of solidification structure of 280 mm x 325 mm bloom of GCr15 bearing steel casting with casting speed 0.6 m/min and 0.5 m/min, liquid superheated extent 30℃ and 10℃ , and secondary cooling water rate 0.2…
The growth behavior of austenite grain of non-quenching-tempering steel SG4201 for direct turning-cutting (/% : 0.42C, 0.50Si, 1.40Mn, 0.009P, 0.005S, 0.02Nb, 0.06V, 0.015N) heating at 1000-1250 T for 0-300 s has been tested and studied by using Gleeble 3500 thermal simulation test machine, and the growth model of aus…
The tested non-quenched-tenipered steel 48MnVS (/% ： 0.48C, 0.60Si, 1.50Mn, 0.35Cr, 0.14V, 0.05S, 0.020Al, 0.0150N) is melted by an 100t EAF, cast to 280 min x 360 mm bloom and rolled to Φ100 mm bar products. The recrystallization precess of austenite in vanadium microalloying non-quenched-tempered steel 48MnVS single…
The effect of C and V content on hardness of non-quenched-tempered pre-hardening plastic die steel (/% : 0.36-0.45C, 0.42-0.46Si, 1.41-1.49Mn, 0.11-0.15 V) has been tested and researched by a 50 kg medium frequency induction furnace in laboratory, and according to regression analysis the vanadium non-quenched-tempered…
The production flowsheet for studied Φ5 mm 500E anti-quake reinforced bar steel 20MnVN (/% ： 0.19-0.20C, 0.23-0.26Si, 1.26-1.31Mn, 0. 016-0.023P, 0.006-0.012S, 0.10-0.11V, 0.0038-0.0163N) is 50 t top and bottom combined blowing converter-LF-160 mm x 160 mm billet casting-rod control rolling and control cooling process…