Materials Literature
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The mixing time of steel in a 130t ladle with single nozzle blowing, double nozzle blowing in right angle location and symmetry location with different gas rate was measured by established water model using conductivity method. Results showed that the mixing time with double nozzle blowing was shorter than that with s…
Main oxygen lances of a 100 t UHP EAF at Nanjing Steel are door carbon oxygen lance and wall small oxygen lances, furnace charging consists of 40 t pig iron and hot metal and 70 t scrap, and total oxygen consumption before optimization of oxygen blowing procedure is 43~45 m3/t. Optimum test results showed that in cond…
Large inclusions and ultra-fine inclusions in 304 stainless steel thin strip produced by twin roll strip casting have studied by scanning and transmission electron microscope. Results indicated that inclusions in thin strip were spheroidal compound oxide inclusions with ingredient CaO-MnO-Al203-SiO2and manganese sulph…
The microstructure and composition of fracture during cold drawing failure of wire coil of SWRH82B stell (0.80~0.84C,0.75~0.85Mn,0.18～0.22Cr,0.015～0.035Al) produced by 280 mm×380 mm casting slab have been observed and analyzed by scanning electron microscope and energy spectrometer. It is obtained that carbon rich con…
The 304L extra-low carbon stainless steel was melted by a 25 kg vacuum induction furnace. The structure evolution of as cast structure of steel after 1 pass equal channel angular pressing (ECAP) at 200 ℃ and the structure of steel with one pass ECAP of as cast structure + 1 150℃ 1.5 h, AC treatment (solid solution str…
The test of desulphurizing by CaO-SiO2-MgO-Al203refining slag with basicity R (CaO/SiO2) 2-7 in a medium frequency induction furnace has been carried out by quadratic orthogonal regression test scheme to establish the mathematical model of relation between ingredient of slag and steel-slag sulfur partition ratio Lfi a…
The structure, impact toughness and abrasion resistance of steel HM (0.48C,5. 1Cr,2.0Mo,1.0V, 2.0W)and steel H13(0.38C,5. 1Cr,1.4Mo,1.0V) have been tested and researched. Results showed that as the con- tent of W and Mo in steel HM was higher than that in steel H13,more undissolved carbides existed in steel HM to hind…
The internal stress of worfcpiece of GCrl5 bearing steel 300 mm x 220 mm cast billet during 1 ~ 4 pass of 650 mill with box pass rolling has been simulated by using finite element analysis software DEFORM and the effects of side taper and rolling temperature on stress were analyzed. Results showed that the first pass…
The longitudinal crack with 0.3 mm depth occurred in φ11.5 mm cold drawn products of low carbon high sulphur free cutting structural steel (0.07C,0.86Mn,0.06P,0.32S) to product some batches of rejection. The analysis results by sampling indicated that the rating unit of banded structure in φ14 mm cold drawing blank wa…
The outer layer of clad pipe is carbon steel such as grade B(L245),X42(L290),X52(L360),X60 (L415),X70(L485),and the inner layer is 18-8 type austenite stainless steel or ferrite-austenite dual phase stainless steel. The cladding process, anti-corosion technology of pipe outer surface, welding process of pipe and prope…
The service temperature of inner wall of mould at normal conditions is 250～350 ℃, the mould copperplate should have better thermal conductivity and resistance to deformation, higher high temperature strength, surface precision and wear resistance. The service life of Ag-Cu and Cr-Zr-Cu is longer than that of peroxidin…
Two dimensional models of rolling process of two-stand Steckel mill at Kunming Iron and Steel has been established using heavy reduction elastic-plastic finite element method (FEM) by finite element software MSC. Marc to simu> late the flatness of 2 mm x 1 200 mm rolled strip of steel C45(0. 43% -0. 49%C). And 3-dimen…
With revamping such as advancing oxygen lances and using modifying process such as charging hot metal for 3 sets of 40 t arc furnace (transformer capacity 15 MVA/set)at Xincheng Special Steel, the tap to tap time of arc furnaces decreases to 60~70 min from original 3 h, electric consumption decreases to 160 kWh/t with…
Fluid field of molten steel in mould with 900 mm height for slab continuous casting has been simulated using k-e double equation model under numerical calculation conditions by a 3 dimensional mathematical software CFD to study effect of process parameters of mould on distribution turbulent kinetic energy at liquid le…
Test results showed that the creeps of spring of steel 44Si2CrV quenched + medium tempering and removed decarburized layer happened at room temperature as stress was higher than critical creep stress value, and the higher tensile or shear strength, the higher critical creep stress. The critical creep stress τccof stee…
The cold rolled tube φ51 mm×6 mm and φ60 mm×6 mm of T91(10Cr9MolVNb)steel piot produced by gcrap + DRI+ pig iron- 100t UHP EAF-LF(VD)-CCM(EMS) φ210 mm round billet-hot rolling tube φ89 mm×7 mm -cold rolling process at Tianjin Pipe. The continuous cooling transformation curves of overcooling austenite and mechanical pr…
The optimum conditions of molten steel to precipitate Ti2O3inclusion in solid-liquid dual phase region during solidification are obtained by study on thermodynamics of deoxidization of pipeline steel X100 (0. 03 ~0. 05C, 1.70 ~ 1. 90Mn, 0. 15 ~0. 25Si, ≤0. 001S, ≤0. 002P) during solidification. The results showed that…
Tempered martensite can be formed at surface of bar to increase its mechanical properties by higher efficient tube type turbulent flow cooling system after hot rolling of bar products. The temperature field of Φ25 mm Q215 steel bar after hot rolling in turbulent flow process has been analyzed by the finite element ana…
The φ25～160 mm round bars of gear steel 20CrMnTiH-0.20～0.22C,0.25～0.31Si,0.93~ 1.00Mn,1.03~1. 15Cr,0.05~0.08Ti were pilot-produced by 120 t converter- 130t LF+RH-280mm×380mm bloom concasting - hot rolling process at Panzhihua Steel. The examination results showed that oxygen content in steel was (10~20) ×10-6average14…
The 0.5 mm×480 mm 50W1300 non-oriented electrical steel sheet 3t (0.04～0.06C,0.82～0.96Si, 0.35~0.40Mn,0.015~0.017P,0.014~0.019S) has been researched and produced by using 40 t LD converter ·180 mm×495 mm slab concasting-continuous rolling flow sheet. The molten steel temperature was controlled between 1650 ℃ and 1670…