Materials Literature
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The casting flow sheet for slab of L245, D36 and X70 etc steel grades is metal pretreatment-100 t converter-LF-RH-250 ~320 x 2 000 mm slab casting. As temperature of charging casting slab is 650 〜700 °C , because of AIN precipitates at grain boundary the claw-cracks of steel plate easily occur, and as the temperature…
An analysis on the products of 1215 low carbon high Sulphur free-cutting steel (/%: 0. 05 ~ 0. 10C, W 0.013Si, 1.06 ~1.33Mn, 0. 051 -0.061P, 0. 24 ~0. 36S, 0.012 0 ~0. 014 0[O], 0.005Al) produced by domestic 100 t EAF-LF-CC, 80 t, 100 t and 160 t BOF-LF-CC four process production line is carried out. Results show that…
The steelmaking flow sheet for boron steels such as 23 ~ 40MnB and 27MnTiB etc is 50 t EAF~LF + VD-CC process. It is available to increase the yield of boron to more than 90% by controlling EAF end [C], preliminary deoxidation by adding carbon powder, steel-cladding aluminum and silicon-manganese at tapping and before…
In desulphurization slag skimming process, the hot metal of different heats shall be brought into slag pot, led to freeze together and hard to break up, in view of this situation a new partitioning agent-lamination material (/%: 6 ~ 15SiO220 ~35 CaO, ≥50MgO, 5 ~ 15FeO) is developed and manufactured by using waste mate…
Tested steel 18CrNiMo7-6 (/%: 0. 17C, 0. 59Mn, 0. 24Si, 1.56Ni, 1.71Cr, 0. 28Mo) is a case-hardening steel for gear, it is required that the structure of normalized steel is ferrite + pearlite and has lower HB hardness value. The higher hardness bainite structure is easily obtained in steel 18CrNiMo7-6 after continuou…
The flow sheet of production for carbon and alloy structural steel, mooring chain steel, bearing steel, spring steel and HSLA steel at Huaigang is 80 t converter-90 t LF-100 t RH-wire feeding-Φ 380 ~Φ600 mm round bloom CC process. With 40 t tundish, auto control of liquid level in curved tube type mold, water spraying…
The deep desulphurization test on low carbon steel (/%: 0. 06C. 0. 20Si, 1. 20Mn, 0. 020Nb, 0. 015Ti) with initial (74 ~ 167) x 10-6[S] is carried out by 20% ~40% high magnesium calcium aluminate premelted slag (/% ： 5SiO2, 37CaO, 42Al2O313MgO, 3FeO) combined with 60% 〜80% synthetic slag (/%: 10SiO261CaO, 25Al2O34MgO)…
Three dimensional numerical simulation on steel works 200 mm x 1600 mm casting slab two-strand T- shape 23 t tundish 4 kinds of structure scheme-present baffle wall and dam, turbulence inhibitor and dam, turbulence inhibitor and present baffle, wall as well as new baffle has been carried out by using calculation fluid…
The production flow sheet for developed 20 mm low-cost niobium-titanium-boron microalloying low carbon steel plate (/% : 0. 06C, 0. 40Si, 1. 60Mn, 0. 010P, 0. 005S, 0. 050Nb, 0. 012Ti, 0. 002B) is 130 t top and bottom combined blown converter-LF-RH-250 mm slab casting-4300 mill rolling-direct quenching-tempering proce…
The production flow sheet for heavy bloom of steel Q345E (/% : 0.14-0.17C, 0.20-0.30Si, 1.28-1.38Mn, ≤0.011P, ≤0.005S, 0.015-0.030A1, 0.032-0.045V) is 65 t LD-LF-VD-Φ600 mm round bloom CC process. With the measures including using sliding plate to stop slag in tapping , and adding pre-melted synthetic slag (/% : 40-50…
The production flow sheet for X65 etc. clean pipeline steel at Tianjin Pipe is 100 I UHP EAF-LF-RH- Φ310 ~Φ500 mm CC process. With using the process measures including charging 35% 〜40% hot metal in arc furnace, controlling slag amount no less than 22 kg/1 at Al consumption 1. 85 kg/t, controlling refining slag index…
Test steel 508-3 (/% : 0. 19C, 0. 26Si, 1.48Mn, 0. 009P, 0. 007S, 0. 78Ni, 0. 50Mo, 0.003Al) is melted by a vacuum induction furnace and cast to 50 kg ingot, forged at 1 150 to Φ16 mm bar, end forging ≥900℃.The effect of normalizing temperature (900 ~ 1 200 °C) and multi-normalizing process (900 〜1 200℃ 1 h-900℃ 1 h-8…
With using Setsys Evolution synchronous thermal analysis system the thermodynamic process of reaction of MgO-C-S (FeS) on 3 kinds of scheme- (1 ) magnesium oxide + carbon powder + sulphur , ( 2 ) magnesium oxide + carbon powder + ferrous sulfide and (3 ) magnesium oxide + carbon powder + ferrous sulfide + aluminum pow…
According to the test research on structure and texture of head, meddle and end of 35W300 high grade 0.35 mm cold rolled non-oriented electrical steel strip coil (/% : 0.002C, 2.71Si, 0.22Mn, 0.015P, 0.003S, 0.0020N, 0.55Als) and corresponding magnetic properties, It is found that due to 12 MPa high pressure water con…
In order to study the influence of the thrust/tension (0 ~ 15 MPa) on rolling process of stainless steel (Crl8Ni8, 2 mm thickness tube)/low carbon steel (0. 06% ~0. 12% C, 4>16 mm, round bar) clad rebar, a finite element model for clad rebar rolling process is established by using finite element software Msc. Marc. Th…
The tested H section steel Q235 (/% : 0.06C, 0.30Si, 1.60Mn, 0.010P, 0.003S, 0.025Mo, 0.40Ni, 0.017Ti, 0.15Cu) is produced by 80 t LD-LF-feeding silicon-calcium wire-28 t tundish-430 mm x 300 mm x 85 mm H section CC bloom-hot rolling process. Due to the longitudinal crack easily occurred on surface of H section steel…
The flow sheet for production of 2 mm ribbon steel Q195L (/%, ：≤0. 08C, 0.05 ~ 0.10Si, 0.30 ~ 0.40Mn, ≤0. 035P, ≤0.035S) is 80 t converter-ladle alloying and soft argon blowing-150 mm x 150 mm billet casting ribbon steel rolling process. Analysis on edge crack ribbon steel results by using optical, scanning electron m…
The chemical ingredient, physical-chemical properties and crystallized mineralogical phases of mold flux and slag rim for 200 mm slab of high aluminium non-magnetic steel 20Mn23AlV (% ： 0. 14 ~ 0. 20C, 21. 50 ~ 25.OOMn, 1. 50 ~2.50Al, 0. 04 ~0. 10V) during concasting has been compared and analyzed. The ingredient of m…
Thermodynamic calculation and analysis results show that in ordinary- pressure the reaction temperature (T) of carbon-thermal reduction for MgO is 1 854 °C, it is difficult under hot metal pre-treatment condition to realize situ desulfurization by generating magnesium from magnesite-based desulfurizer. As carbon-therm…
Finite element simulation on rolling process for 30CrMo steel 350 mm x 450 mm casting bloom with surface 1 150 ℃ and canter 1 240 ℃ rolling to 0230 mm bar products is earned out to study effect of rolling parameters including single pass 10% ~ 30% reduction ratio, double pass reduction 50 mm-50 mm, 10 mm-90 mm and 90…