Materials Literature
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The flow sheet for steelmaking steel 20CrMnTi, 0. 45C, 40Cr and GCrl5 at melting shop is 70 t BOF-LF- VD-220 mm x220 mm CC process. It is obtained by analysis of 22 heats of steel 20CrMnTi, 40Cr and 0. 45C that the average nitrogen content in steel after BOF tapping- [N] is 21.70 x 10-6end LF refining the average [N]4…
Based on referential production data of 80 heats of SPHD, SPHE and IF steel, a calculation model for acid soluble aluminium content in molten steel- [Als] at end of RH refining deoxidizing by Al is established by using multiple linear regression analysis and the effect of activity of oxygen in liquid, adding aluminium…
Based on similarity principle, the effect of different flow control device in 73 t tundish for two-strand 238 mm x 1 500 mm slab casting on flow field has been studied by using 1 : 3 water model in order to get optimum flow control device combination and optimizing dam position and height. Water modelling results show…
The simulation test on optimization of 250 t ladle bottom argon blowing location has been carried out by using geometric similarity 1： 3 water model, and the liquid mixing time with single nozzle blowing, 90° angle double nozzle blowing and 180° angle symmetric double nozzle blowing at different blowing rate (5 ~ 25 m…
The production flow sheet for medium-carbon vanadium steel SG45 (/% : 0. 42 ~0. 50C, 0. 17 ~0. 27Si, 0. 50 ~ 0. 80Mn, ≤0. 035P, ≤0. 035S, 0. 06 ~ 0. 10V) is 60 t LD-LF-VD-CC process. The vanadium direct alloying commercial test is carried out during converter tapping by adding aluminium cladding with steel-alloys ( ma…
Based on theoretical analysis and calculation on converter dephosphorization and carbon-phosphorus selective oxidation transformation temperature, in condition of hot metal non-dephosphorizing-pretreatment, the production practice of double slag dephosphorization in 120 t top and bottom combined blown converter has be…
The developed new steel 4Cr3. 75MoSiV for extrusion wheel （/% ： 0. 39C, 0. 95Si, 0. 35Mn, 3. 75Cr, 1. 25Mo, 0. 99V, 0.009 5N） and common steel 4Cr5MoSiV for extrusion wheel （/% ： 0. 42C, 1. 20Si, 0. 38Mn, 5. 04Cr, 1. 14Mo, 0. 85V, 0.035 ON） are melted by a 10 kg vacuum induction furnace, and forged to Φ18 mm bar for t…
In corresponding with profile shape defect trouble about 1.2 mm x (250 ~ 380) mm strip of 301S and 301B cold rolled austenite stainless steel at steel works, the influence of change of strip width on profile shape during twelve-high mill rolling process (reduction 18% -26% , rolling force 750 ~ 1 600 kN) is obtained b…
The flow sheet for production of bearing steel GCr15 at Special Steel Co, Masteel is 110 t UHP EBT EAF- 120 t LF-RH-Φ380 〜Φ600 mm round bloom CC process. By using the process measures including controlling EAF end [C] 30. 10% , slagging down quantity W2. 0 kg/t steel, using ferro-aluminium to pre-deoxidize in tapping,…
The characteristics of desulphurized sludge produced from hot metal pretreatment KR desulphurizing process are high pollution, obvious poisoning, unitary slag treatment process, limitations of selectable treatment process, and difficult recycling of resources. The de-poisoning process of KR desulphurized sludge by qui…
The Al in non-magnetic steel 20Mn23Al2V (/% ： 0. 14 ~ 0. 20C, ≤0. 50Si, 21. 5 ~ 25. 0Mn, 1. 50 ~ 2. 50Al, 0. 04 ~0. 10V)- [Al] easily reacts with SiO2 in mold powder- (SiO2) led to modification of mold powder and the liquidus temperature of non-magnetic steel is lower because of higher alloy elements content, therefor…
The steel 316LN for test (/% : 0.015C, 0. 65Si, 0. 90Mn, 17.3Cr, 12.8Ni, 2. 6Mo, 0. 018 ~ 0. 200N) is melted by a 50 kg vacuum induction furnace, adding chromium nitride in atmosphere after vacuum refining. The ingot is forged to Φ20 mm bar and hot-rolled to 4 mm sheet, then solid-solution-treated respectively at 1 10…
The forging of steel 30CrMoA (/%: 0. 30C, 0.21 Si, 0. 53Mn, 0. 003S, 0. 005P, 0. 98Cr, 0.22Mo, 0. 06 V) for Desander is a tubular stock with outside diameter Φ405 ~493 mm and inside diameter Φ90 - 167 mm and in specification the transverse impact energy of quenched-tempered steel at -40 °C is ≥20 J. With conventional…
The forming cause and fracture mechanism of pen-tip shaped fracture of Φ12.5 mm SWRH82B steel (/%: 0. 80C, 0. 74Mn, 0. 22Si, 0. 013P, 0. 008S) wire rod is analyzed by optical microscope, scanning electron microscope and energy dispersive spectrometer etc. to get the main causes of formation of pen-tip shaped fracture…
Based on production data and practice of 30 t VOD unit at the second steelmaking plant, FuSteel, the - effect of initial liquid temperature on yield of chromium, oxygen utilization ratio and oxygen consumption during VOD refining process is analyzed. Results show that in condition of VOD oxygen browning, with increasi…
An analysis on cracking and perforation defects occurred in 230 ~ 400 mm plates rolled from 28 ~40 t ingot of low carbon steel S355JR and S355J2 (/% ： 0. 17 ~0. 20C, 0. 30 ~0. 55Si, 1.40 - 1.60Mn, W0.020P, W0.015S, 0. 020 ~ 0. 040Al, 0. 020 ~0. 030Nb) is carried out. With the optimum process measures including increas…
With using 50 t EAF-LF(VD)-CC-slow cooling pross, controlling EAF end [C] 0.12%-0.25% and end [P]≤ 0.015%, pre-deoxidizing and alloying in tapping, using CaO-Al2O3free fluorine pre-melting refining slag, and integrate casting control technology including 19 t tundish with liquid depth ≥ 800 mm, casting speed 0.35-0.45…
In view of the problem of insufficient capacity of cooling bed with increasing output of rolling mill products, the through-water cooling unit for rolled bar is installed. Production results show that for HRB335 Φ16 mm hot-rolled ribbed steel bar (/%: 0. 20C, 0. 20 〜0. 40Si, 0. 4 ~ 1. 2Mn), with original finishing rol…
The production flow sheet of non-quenched and tempered steel S38MnSiV (/%: 0.41 ~0.45C, 0.55 ~ 0.70Si, 1.40~1.55Mn, ≤0.025P, ≤0.025S, 0.10 ~ 0.20Cr, 0.11 ~ 0.15V, 0.012 0 ~ 0.020 ON) is 40% hot metal + scrap-100 t EAF-LF-VD-160 mm x 160 mm ~260 mm x 340 mm CC process. With controlling arc furnace tap end [C] 0.15% ~ 0…
The production flow sheet for pipeline steel X70 is KR metal pre-desulphuration-180 t BOF-LF-RH-slab CC process. With optimization of refining slag ingredient and slagging operation, and based on effect of bottom gas blowing rate (400-700 L/min) on end [S] , the LF deep desulphurization process has been schemed. Pilot…