Materials Literature
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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…
Quality requirement for 350 km/h high-speed rail steel is total oxygen content in steel- T[O] ≤20 x 10-6and B, C and D series inclusions rating ≤1.0. In domestic heavy rail steel steelmaking process, it is normally to using non-aluminium deoxidation process, i. e. intensifying deoxidation by using SiCaBa alloy to form…
The single pass compression test of -1real strain ≤1.0 at 850 ~ 1 000℃ has been carried out by using Gleeble-1500D thermal simulator to get true stress-stress curves of the steel with different deformation parameters. Test results show that with increasing temperature and decreasing strain rate, the flow stress of ste…
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…