Materials Literature
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According to solidifying and mechanical characteristics of low carbon steel Q235B 230 mm x 1500 mm slab at elevated temperature, a couple thermal and mechanical finite element analysis model for temperature field and stress field of slab during casting process has been established, and the coupling calculation is carr…
The effect of original finish rolling process [finish rolling at ≥930℃. and wire coiling at (870 土 10) ℃] and improved finish rolling process [finish rolling at ≥950 ℃and wire coiling at (900 ± 10) ℃] for φ5.5 mm 0.73% C 72A tire cord steel coil on its structure, texture and mechanical properties has been studied by u…
The structure and composition of slag shell and final slag during remelting process of 9. 5 t remelting ingot of hot working die steel H13 with 380 kg 60CaF2-30Al2O3-10CaO ternary slag system have been analyzed. Results show that during electroslag remelting process the slag shell presents obvious laminating-structure…
According to metallurgical quality issue about low billet yield of hot working die steel H13 at steel works, the statistic analysis on relative quality to influence on billet yield has been carried out to get that the porosity defects caused by poor insulation of hot top make up 58%-76% of the total non-qualified ingo…
With process measures including charging 30 ~40 t hot metal and 12 〜16 t quality scrap in 50 t EAF, EBT slag free tapping and adding 150 ~200 kg steel-clad aluminum to pre-deoxidize, diffusion deoxidation by SiC and controlling refining slag basicity 4.0 ~6.9 in LF process, soft argon blowing before and after VD, shie…
The production flow sheet for stainless steels steelmaking at Taishan Steel Works is 60 t EAF-GOR bottom blowing converter refining-160 mm x 1600 mm slab casting process. With using Gleeble-1500D thermal simulation testing machine, the high temperature properties of casting slab of austenite stainless steel 201 ( 6.54…
In order to alleviate the impact of flow jet of nozzle side-ports on solidifying shell and easy to use the sideport nozzle to the mold for casting square billet with smaller cross section, a design idea of submerged entry nozzle ( SEN) with flabelliform side-ports is advanced. The characteristics of flow field and tem…
The metallurgical flow sheet of developed 25 mm Q800CFE steel plate (/% : 0.04-0.08C, 0.20-0.50Si, 1.50-1.80Mn, ≤0.015P, ≤0.005S, 0.015-0.060Nb, ≤0.30Mo, ≤0.03Ti, 0.0008-0.0030B； crack sensitivity index ≤0.23) is metal pretreatment-120 t BOF-LF-RH-220 mm CC-rolling process. Finishing plate rolling temperature is ≤850…
The gear steel 20CrMnTi with narrow hardenability band is produced by hot metal desulphurizing-120 t BOF-LF-200 mm x 200 mm billet casting-hot rolling process at Long Products General Plant, Wuhan Iron and Steel. Production results show that with the process measures including using BOF catch carbon practice to contro…
The results of process during tapping of low carbon aluminium killed steel SPHC melted in 120 t converter, by adding 2.0-2.5 kg/t ferroaluminium (49% Al) and adding 2.5-4.0 kg/t LF solid abandoned refining slag (/% : 6.29-10.33SiO219.14-29.57A12O354.69-59.96CaO, 4.97-6.89MgO) to replace the liquid cleaning agent (prem…
Test as-cast grain-oriented silicon steel (/% : 0.044-0.056C, 3.12-3.32Si, 0.08-0.11 Mn, 0.002-0.008S, 0.0029-0.0291 Als, 0.0062-0.0109N) is melted by a 30 kg high frequency vacuum induction furnace. The research results by using field emission-scanning electron microscope/energy dispersive spectrometer (FE-SEM/ EDS)…
The structure characteristics of a special asymmetrical 12 strand 200 mm x 285 mm bloom 35 t tundish at steel works have been analyzed by geometric similarity 1:3 water model test, it is obtained that the nonsymmetrical degree and structure of original tundish are larger and unreasonable led to poor consistent in each…
A Hensel-Spittel flow stress model of steel 20CrMnTi with strain 0 ~0.8 and strain rate 0-3 s-1at 800-1150 °C is established by analysis on hot continuous rolling process of round bar. With using finite element software LARSTRAN/SHAPE the simulation of process of steel 20CrMnTi with 8 pass rolling from 200 mm x 200 mm…
The test cold sheet of 2. 3Si non-oriented silicon steel (/% : 0.003C, 2.30Si, 0.16Mn, ≤0.020P, ≤0.005S, 0.54Al) is first cold-rolled from normalized and un-normalizing 2.5 mm hot-rolled plate to 0.6 mm sheet (reduction 76% ) , then intermediate annealed at 750-950 ℃ for 2.5 min and double cold-rolled to 0.5 mm sheet…
With the process measures including EAF charging hot metal 25-36 t/heat, during tapping adding 100 kg ferroaluminium to pre-deoxidizing, controlling refining slag basicity ≥ 4 during LF refining, after feeding Al wire ( aim 0.015% Al) adding ferrotitanium (aim 0.04%Ti), after VD adding ferroboron and soft argon blowin…
The simulation test on removing inclusions in original tundish and optimum tundish established an additional retaining wall has been carried out by using a geometric similarity 1: 3 water model, and based on waler-simulated test results, the structure of 40 t tundish is optimized and the pilot production of high carbo…
The pilot production flow sheet for developed weathering steel S355J2W (/% : 0.06 ~ 0. 10C, 0.20 ~ 0.40Si, 1.00-1. 30Mn, ≤0.008S, ≤0.020P, 0.25 〜0.40Cu, 0.30 ~ 0. 55Cr, 0.10 〜0. 30Ni, 0. 020 ~ 0. 040Nb, 0. 020 ~ 0. 050Alt) is hot metal-120 t top and bottom combined blown converter-LF-250 mm x2 000 mm slab CC-≤16 mm pl…
The cause and preventing measures for nozzle clogging during steelmaking process of ultra-low-carbon aluminium-killed steel such as XGM6 steel (/%: 0. 012C, ≤0. 012Si, ≤0. 08Mn, ≤0. 015P, ≤0.010S) produced by hot metal pre-desulphurization process-80 t top and bottom combined blown converter-LF-RH-280 mm x325 mm bloom…
The bake hardening values ( BH) of ULC-BH steel 1 mm annealed cold rolled sheet (/%： 0. 002C, 0. 008Si, 0. 60Mn, 0. 043P, 0. 009S, 0. 031 Al, 0.017Ti) with prestraining by 2% ~ 10% and baking al 170 °C for 20 min have been measured, and the effect of Cottrell atmosphere on bake hardening property of ULC-BH sleet is st…
According to the prototype 100 t ladle in steel works and based on similarity theory, a 1：4 water model is established to study the effect of double nozzle bottom blowing position (0. 54 ~0. 72 R), angle (45° ~ 180°) and bottom blowing rate (0. 04 〜0.55 m3/h) on mixing time and steel-slag interface and get optimum bot…