Materials Literature
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The short-ranged bonding structure of organosilicate glasses can vary to a great extent and is directly linked to the mechanical properties of the thin film material. The combined action of ultraviolet (UV) radiation and thermal activation is shown to generate a pronounced rearrangement in the bonding structure of thi…
The math modeling of distribution of flux flow field and analysis on pressure of meniscus in mold have been carried out by commercial software Fluent. The flow rate of flux was maximum at time t =0 during a oscillation circle,at that time the minus pressure on solidified shell was produced by flux, therefore it should…
The phase composition, impact energy Akvand hardness HRC value of duplex stainless steel 00Cr25Ni7Mo4N solution treated at 900~1300 ℃ have been studied and examined. The results showed that 16.97%~ 3.22% a- phase precipitated in duplex stainless steel during solution treatment at 900~1020 ℃ led to the impact energy Ag…
The austenite stainless steel YGA201-≤0. 10C,5.0～9.5Mn,16.0～19.0Cr,3.5～5.5Ni,1.0~ 2.0Cu,≤0.2N has been melted and studied by a 200 kg induction furnace in laboratory. The mechanical properties and corrosion test results showed that the elongation of 1050 ℃ solid solution heat treated YGA201 stainless steel containing…
The inclusion, structure and texture of 0.5 mm cold rolled sheet of non-orientation silicon steel-0.003C 1.46Si,0.38Al have been tested and analyzed. The analyzed results showed that difference in anisotropy of iron loss of sample was 7.56%～11.01%.Reasonably increasing finishing rolling temperature of non-orientation…
The nitrogen content in GCr15 bearing steel at each melting phase in 50 t EAF-LF(VD)-CC process was analyzed to obtain that the EAF end [N] was(23~36)×10-⁶ and the N content in products was (79~104)×10-⁶.In order to decrease the N content in bearing steel, with charging ≥35% hot metal in EAF, using low nitrogen carbon…
The effect of 2.5 mm hot rolled plate of electric steel(≤0.005%C-2.5%～2.8%Si)normalizing at 850 ~1100℃ on structure and magnetic properties of 0.5 mm cold rolled sheet annealed at 880 ℃+ 950 ℃ has been studied.The results showed that with increasing normalizing temperature of hot rolled plate,the recrystallized grain…
The effect of metal temperature, initial sulfur content in metal, stirring time, rotational speed and adding amount of desulphurizer on desulphurization results of an 80 t KR hot metal pretreatment unit has been studied. The results showed that with increasing metal temperature the desulphurization effects increased,…
The size, amount and morphology of carbo-nitride precipitated in Nb-V-Ti-B and Nb-V-Ti microalloy steel EH420 rolling at 900~1000℃ with deformation 40%～60% by electron microanalysis and physical-chemistry phase analysis technique. The test results showed that the amount of carbo-nitride precipitated in steel rolling a…
As compared with austenite stainless steel, the ferrite-austenite duplex stainless steel has higher mechanical properties, excellent stress and pitting corrosion, and lower cost due to lower Ni content, especially improve weldability of steel due to lower carbon content and higher nitrogen content in steel. Higher nit…
The 9.50 mm strip of X60 pipeline steel (0.03~0.07C,1.2~1.6Mn,Nb+V+Ti≤0. 15)has been developed by 150 t EAF-LF-50~60 mm cast slab-hot continuous rolling process and Nb-Ti compound-alloying technology at Zhujang Steel. Examination results showed that the structure of strip was ferrite + minor pearlite with grain size r…
During 70 t EAF-LF melting steel 20MnSi,the desulphurizing refining time for average sulphur content in steel from 0.060% to 0.015% decreased to 20~30 min from original 30~45 min by adding lime 400~450 kg and synthetic slag 80~250kg,controlling EAF tapping steel temperature 1580~1630℃,increasing refining slag amount,…
The precipitated phase composition, mass percent and particle size distribution in microalloyed high strength steels 70A(0.05C,1.90Mn,0.01V,0. 13Ti,0.06Nb) and B2C (0.06C,2.34Mn,0.03V,0.03Ti,0.04Nb,0.0067 B) have been studied by chemical phase analysis and small-angle X- ray scattering method. It was found that there…
The effect of water ratio in secondary cooling zone on billet cooling speed, solidification structure and center carbon segregation index of 0.64% ~ 0.82%C steel 150 mm x 150 mm billet casting with 250A/5Hz electromagnetic stirring has been tested. The results showed that with water ratio in secondary cooling zone inc…
The development of production of tools for rock drill in China and present domestic market condition of rock drill tools for handheld rock drills, tools for hydraulic rock drill vehicle, connected rod for pneumatic drill vehicle and tools for down-the-hole drill are summarized and analyzed. It is indicated that high s…
The effect of B₂O₃ on melting temperature and complete melting time of 40.5%～70.0%CaO- 19%~ 45%Al₂O₃-SiO₂-MgO- CaF₂ pentary slag series by semi- sphere point method has been studied. The test results showed that the average melting temperature of pentary slag with 40.5%~60%CaO,2%～10%CaE₂and(B₂O₃)/(CaF₂) 0. 17~0.33 was…
Simulation of liquid steel feeding system of pool in a twin roll 2~3 mm thin strip concaster with roll diame- ter 1200 mm,wide 380 mm and pool depth 460 mm at Nanchang Steel and evaluation of nozzle structure has been carried out by using 1:2.4 ratio dynamic physical model.The nozzle size structure was optimized by or…
A systematic mathematical model group has been developed to simulate the billet section temperature distribution,austenite structure evolution and products properties. "Die prediction system for structure and properties is established based on the sub-models determined by test including critical model, austenite recry…
The φ18 mm high strength spring steel 60Si2CrVAT(0.57C,1.65Si,1.04Cr,0. 13V)was produced by 100 t EBT EAF-LF(VD)- 300 mm×320 mm billet casting process at Xingcheng Special Steel. The S+ P content in finished steel was ≤200×10-6and average oxygen content ≤12×10-6.Because the V carbon-nitride couldn't be dissolved compl…
The spring steel 60Si2Mn(A)was produced by an 150 top and bottom combined converter - 150 t ladle furnace(adding Al 1.2kg/t, Ba alloy 1.0 kg/t, Ar stiring, feeding SiCa wire)- 165 mmx165 mm billet concaster.The oxygen content in steel at end phase of ladle furnace was (15~25)×10-6and residual aluminium was 0.020%～0.03…