Materials Literature
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The flux agents in common mould powder normally are fluoride and sodium oxide, both all produce environmental pollution. Therefore the physical properties such as melting point, viscosity, crystallizing properties and surface ten- sional force of mould powder containing flux agent B₂Os were studied. The test results s…
The chemical composition of separating ring and concasting process have been improved by analysis on break of separating ring for horizontal concasting φ130 mm billet for tube and test of effect of separating ring composition on properties. The results showed that with using B-Sis N4+30% BN separating ring, manufactur…
The general chemical compositions of microalloyed intragranular ferrite steels are 0.2~0.4C,0.2～0.8Si, 1.0~1.7Mn,0.05～0. 15V. It is a main measure to increase the strength and toughness of ferite-pearlite microalloyed steel using recrystallized forging and rolling to control cooling rate in phase transformation range…
The numeric simulation of effect of X-shape submerged nozzle on flow of molten steel in a mold for 160 mm x 160 mm concasting billet has been carried out by viscous fluid mechanics theory and CFD software Fluent. It was verified that during pouring with X-shape submerged nozzle, the vortex molten steel entering into m…
The main chemical compositions of spring steel 38SiMnVBE are 0.37～0.42C,0.80～1.20Si,1.20~ 1.60Mn,0.08～0. 14V,0.0005～0.0035B,and the steel requires P≤0.025%,S≤0.015% and[0]≤15×10-⁶. The strength of steel 38SiMnVBE is 1905～2020 MPa,0.2% yield strength 1715～1850 MPa,elongation 9.0%~ 11.5%,reduction of area 44%～54%, which…
The effect of austenite grain size and deformation(true strain 0.4) of gear steel 0.23C-0.74Mn-0.90Cr on continuous cooling transformation(CCT) structure and CCT curves have been studied by Gleeble 1500 hot simulator. Test results showed that as gear steel without deforming, the critical cooling rate to get complete p…
Based on the hot simulation test the effect of deformation condition and microalloying element 0.0180.056NB, 0.01 - 0.02V and 0.01 - 0.02Ti on behavior of hot deformation of 0.06 - 0.08C test steel has been analyzed. And based on the Sellas-Tartat equation, the mathematic models to calculate the stress- strain curves…
The ratio of gauge of 0.80~1.20 mm cold- rolled 304 stainless steel - carbon steel(Q235A,08Al)-304 stainless steel clad plate produced by “exploding + rolling” process is 1:10:1. The clad plate has nice market prospect in building gate, window screen wall and cooker commodity field. The results of analysis on cold ben…
It is basic condition for production of cleanliness to control Are furnace[P][S], total amount of [Pb] and [Zn].To prevent rephosphorization and slag free tapping are key operations to get low [P][S] molten steel of arc furnace. AS melting down the [Pb] exceeds standard limit, first stop carbon injection operation and…
The large-volume are fumace and continuous caster for alloy steels were built and imported at domestic main special steel works during end of the nineties of 20th century thus to bush the development of continuous casting technology for special steel in China forward. The casting billet size of alloy steel was between…
The φ25 mm bar of microalloying stocl F40MnV- 0.39～0.43C,1.20- 1.36Mn,0.07～0. 10V 0.009～0.024P,0.011～0.018S was produced by a 55 t converter + 60 t ladle refining fumace,150 mm×150 mm 4 strand concaster, short- stressed continuous rolling mill strain process. Okygen content in steel [0] was(18,8～20.5)x 10-6and[N] was(…
The surface temperature of profiled beam blank of Nb microalloying steel SM490YB-0.09～0. 13C,1.35 ~1.50Mn,0.04～0.06Nb during concasting by CIT-M Infrared Pyrometer. The results showed that the traverse surface temperature of beam blank was uneven, the surface temperature of beam at measured location in secondary cooli…
In general the special steels contain given alloying element, of which the solidification state is different from general carbon steel more easy to produce composition and structure segregation and surface crack of casting billet. Therefore it is necessary to increase cleanliness of liquid steel during special steel s…
The effect of flow control devices with different size and installed location on fluid flow in a thin slab conca-sting tundish at Maanshan Iron and Steel has been investigated by physical and mathematical hydraulics- simulation. The re- sults showed that as tundish hadn't flow control devices there were a short flow a…
The φ18mm and φ26mm test stel products of new high strength and toughness spring steel 40T;0.41C- 2.12Si- 1.03Cr- 1.98Ni-0.31Mo-0.25V,steel 44T:0.44C-2.28Si- 1.42Cr-0.25V and spring steel 60Si2CrVA:0.59C- 1.65Si- 1. 11Cr-0. 18V were produced by 20 t are fumace melting, rolling and cold drawing. The results of each ste…
The control rolling of φ45 mm steel UC2 -0.49C,Q.01Ti,0.01V was pilot produced by new built 350 kt special steel continuous rolling production line at Shanghai No5 Steel with controlling the Kocks inlet temperature of bar between 780 ℃ and 820 ℃.The results showed that the grain size rating of φ45 mm bar of UC2 steel…
The soft-contact electromagnetic continuous casting for steel is a technology using high frequency alternating electromagnetic field to load a electromagnetic force on initial solidification zone of billet in mold decrease contact pressure between liquid steel and mold wall, thus reducing the effect of mold oscillatio…
The USTB(University of Science and Technology Beijing)furnace wall oxygen injection technology have been used for a 50 t EBT arc furnace and a 60 t shaft arc furnace at Nol melting shop at Fushun Steel by cooperation of Fushun Steel and University of Science and Technology Beijing. The application results showed that…
The effect of end slag basicity, end Al content and vacuum treatment time in 20t LF-VD refining on oxygen content in 105 heats gear steels SCM318H,SCM322H,SCM420K-C, SCM822H and SCr40K for auto has been analyzed and studied. The practice operation results showed that using white slag operation, controlling end slag ba…
The 30~40 mm medium plate of HQ590DB ultra-low carbon bainitic steel - 0.05C- 1.5Mn-0.04Nb- 0.02Ti-≤0.0002B has been pilot-produced by 180 t converter- RH - LF (Ca treated)- concasting slab:230(300)mmx1650mm×6000 mm-4300 mill controlled rolling and cooling process. [H] in concasting slab was 1.7×10-⁶,[O] 21 ×10~⁶ and[…