Materials Literature
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The cleanliness low carbon aluminum killed steel(0.05～0.06C,0.04Al)was melted by 210 t top and bottom combined blown converter - CAS(composition adjustment by sealed argon bubbling)refining - concasting 230 mm slab flow sheet. With sealed argon bubbling treatment for 27~28 min,the total [0] of liquid steel decreased t…
With adjusting the rate of cooling water of high pressure spray jet at 3 water tanks(rolling speed 1.48 m/s,inside diameter of spray jet 80 mm,water pressure of Nol water tank before finishing rolling ≤0.3 MPa,No2 tank after finishing rolling≥1.0 MPa and 3B tank ≥1.0 MPa)to control finishing rolling temperature 950 ℃…
The dual phase steel adding Nb(0.19～0.21C,0.7～0.8Si,1.9~2. 1Mn,0.02～0.04Nb)and no adding Nb(0. 17~0. 19C,0.4~0.6Si,1.7~1.9Mn)were melted by using a 25 kg vacuum induction furnace and hot rolled to 3.5 mm plate by two-high mill then cold rolled to1.0 mm and 1.36 mm sheet in laboratory. The cold sheet heated in salt bat…
The recrystallized annealed structure and HB hardness of DDQ(Deep Drawable Quality)cold-rolled deep drawing sheet of0.003C-0.05Al-0.06Cu steel produced by TSCR(Thin Slab Casting and Rolling)process have been test- ed and researched. Results showed that the recrystallization temperature of the DDQ cold-rolled deep draw…
The simulating batch annealing test of 1.0 mm cold rolled steel sheet for chain at 650~690 ℃ for 2~6 h has been carried out by vacuum heating fumace in laboratory.Results showed that the structure of cold rolled steel for chain was ferrite + free cementite,with increasing anncaling temperature and time the structure o…
The ingredients of D type and B type inclusions in high cleanliness bearing steel CCr15 produced by hot metal + scrap- 100t EAF-LF(VD)-CC flow sheet were analyzed and the effect of refining slag ingredient and VD argon stiring process on brittle inclusions in steel were tested. Results showed that in CCr15 steel produ…
The effect of bottom blown location of an 80 t LF on mixing time of liquid steel and liquid flow field of ladle longitudinal section have been tested and studied by established water model and three dimensional Euler model. Results showed that the optimum bottom blown location was 0.550R (ladle radius) , it was availa…
The controlling molten steel superheat of GCrl5, 60Si2Mn, 40Cr and 0.20C steel in 25 t ladle and 16 t tundish has been studied. The controlling of molten steel superheat was mainly depended on temperature decreasing speed of molten steel as the heat storage process of ladle line came to equilibrium state - temperature…
Cu precipitated in feirite of 0.06C-0.40Cu bainite steel is kept with matrix in semi-coherent Kurdjumov-sachs relation, according to the theory of mismatch dislocation, with increasing temperature the calculated specific interfacial energy between ε-Cu and ferrite matrix increases, the coefficient of diffusion of Cu a…
The effect of residual elements Pb,Sn content in austenite stainless steel SUS304HC (≤0.06C,18~19Cr,8~11Ni,2~3Cu) and 201Cu (≤0.08C,7.5～10.0Mn,14～17Cr,4～6Ni,2~3Cu)melting by arc furnace + AOD and convenet + VOD on cracked comer and circular crack of bloom and surface transverse crack of coil,and the source and control…
At present the main advances in equipment technology of 100～300 t large converters are application of creep-resistant material 16Mo3at elevated temperature 550 ℃ for converter shell; application of steel P285NH and P420NH for converter trunnion and ring; natural air cirular cooling trunnion; unique water cooling upper…
The powder no-adding carbon of which the main ingredient is TC 1. 10~1.22，Al2O35.03～5.62，Na2O 3.29~3.40，CaO/SiO2=0.55~0.58 has been developed to reduce the recarburization of 10.3 t ingot of 0.03~0.07 C cold heading steel.The powder has high melting temperature (1300℃),high viscosity(1.5 Pa · s at 1500 ℃)and low bulk…
Test of tensile properties and compression with single pass and continuous 4 pass at elevated temperature for forged bar of steel 00Cr25Ni7Mo4N melted by vacuum induction funace has been carried out by Gleeble thermal simulator. Results showed that at 900～1250 ℃,with increasing temperature and at 950～1100 ℃ with progr…
The effect of process parameters such as arc furnace end [C],refining slag,argon blowing,Als,shielding casting,liquid steel temperature and refractory material etc on occurred probability of Ds in CCr15 bearing steel and gear steel produced by 100t EBT DC EAF- 100 t LF/VD-300 mm × 340 mm billet process has been studie…
The continuous cooling transformation (CCT) curves of high carbon steel 72A (0.72C,0.53Mn,0.22Si) for tyre core wire has been measured by THERMECMASTOR-Z thermal simulation machine using thermal dilatation method,and the effect of start cooling temperature(840～930℃)and cooling rate(0.8~22 ℃/s)on structure of steel has…
The steel 40MnB is produced by 50t EAF-LF(VD) process at Special Steel Plant,Laiwu Steel.Results showed that with insuring refining slag basicity 3.0～5.5,feeding Al wire,then feeding silicon-calcium wire in LF refining end phase,skimming and 50 Pa VD treated for 35~40 min,after VD feeding Al wire and titanium wire,and…
The numerical simulation of temperature distribution and NO emission in furnace during baking of an 120 t AOD unit by using new regenerative baker for AOD has been carried out. And the effects of temperature of preheated air (1273~1473 K) and distance L between air inlet and fuel gas jet (0.28~0.51m) on flow field, te…
Statical oxidation behavior of ferrous-base alloy GH1140(%:0.08C、21.60Cr、37.42Ni、2.31 Mo、1.63W、0.44Al、0.91Ti),nickel-base alloy GH4098(%:0.02C、18.52Cr、5.92Co、5.81W、3.96Mo、2.74Al、1.19Ti、0.10Fe) and cobalt-base alloy GH5605(%:0.10C、19.92Cr、10.55Ni、15.16W、1.77Mn、0.52Fe) at 750~950 ℃ for 100 h has been studied. Ruesults s…
According to real production situation of an 180 t top and bottom combined blown converter at Anshan Steel, a supersonic jet oxygen lance has been designed to carry out water modeling test, in order to avoid the problem of revising lance position which is caused by subsonic jet oxygen lance. The test was carried out b…
The structure and texture of 2.9 mm hot-rolled plate,0.9 mm cold-rolled sheet and annealed temper-rolled sheet of 0.04C low carbon steel DC03 produced by CSP process have been studied. Results showed that the structure of hot-rolled base plate was ferite matrix + a small amount of pearlite dispersed along grain-bounda…