The macrosegregation law of C, S, P and Al in 240 mm×240 mm cast billet of steel 40Cr (0.38~0.40C, 0.90~0.91Cr, 0.015~0.029P, 0.009~0.014S) has been studied by using the technology of original position statistic distribution analysis (OPA).
The quality experiment results of 20 heats 65Mn steel showed that the analyses of steel were C 0.63～0.68, Mn 0.95～1.07, P 0.009～0.023, S 0.006～0.017, and the deviation of carbon content at section of casting billet was ≤0.02%.
The distribution of size and frequency of inclusion in samples of surface layer of IF steel(1()150) mm×230 mm casting slab with unsteady casting speed(1.4 m/min to 0.6 m/min and 0.6 m/min to 1.4 m/min) has been studied by Original Position Analysis System(OPA-100).
It is obtained by calculation that the immersion depth of nozzle for mould of 1 250 mm×200 mm slab 175 mm, the exit angle 16°～18° and the casting speed 1.0～1.2 m/min are available for slab casting.
Based on the systematical research of the Nb microalloying technology ,Zhujiang steel has successfully developed 9.50mm thickness X60 pipeline steel in EAF-CSP process by Nb-Ti microalloying technology with 60mm thickness slab.
The influence of heating temperature(1 200 ℃,1 180 ℃)of 180 mm cast slab,rolling passes for 2.3 mm hot coil(7 pass and 5 pass),finishing rolling temperature(780～860 ℃)and coil temperature(≤710 ℃)on iron loss and magnetic intensity of 0.5 mm cold rolled non-oriented silicon steel 50W600 has been tested.
Φ38 mm×6. 6 mm seamless tube of steel TP347H (1Cr19Ni11Nb) was produced at Taiyuan Steel by hot metal pretreatment + 30 t EAF melting alloying steel - 75 t K-OBM-S blowing - VOD treatment - LF - bloom by 5. 6 t ingot or 220 mm×220 mm concasting billet -Φ100 mm tube blank piercing - cold rolling ( cold drawing) flow sheet.
太钢采用铁水预处理+30 t电弧炉熔化合金钢水-75 t K-OBM-S吹炼-VOD处理-LF精炼-5．6 t铸锭开坯(或220 mm×220 mm铸坯)-Φ100 mm管坯穿孔-冷轧(冷拔)流程,生产了Φ38 mm×6．6 mm TP347H (1Cr19Ni11Nb)钢无缝管。
The weight of one crankshaft finished product of steel 42CrMoA (0.34～0.49C, 0.9～1.2Cr, 0.15～0.25Mo) for diesel engine is about 1 t, for which the weight of forging blank is 6.2 t, while the weight of electroslag remelting (ESR) casting - welding blank in only 1.5 t.
When the elements in steelmaking are controlled as follows: (As+Sn)≤0.030%, O≤40×10 -6, N≤90×10 -6, P≤0.015%, S≤0.010%, and each kind of inclusions rating ≤1, the all properties of tube round blank shall be up to the requirements of standard and application.
The section of cracks is oxidized seriously, the length of cracks ranges from 5 to 15mm, the depth of cracks ranges from 1.0 to 2.5mm, the cracks are mainly distributed over the upper half of tube billets.
Gleeble-1500 was used to test the hot ductility of rolled medium-carbon 45 steel bars from continuously cast billets with sulphur contents of 0.016% and 0.06% respectively.
Steel pipes with φ57×3～4mm, manufactured from stainless steel billets with 95mm diameter by the innovated process of descaling→piercing on a φ100mm piercing mill→rolling→cold-rolling on a LG-80 cold-rolling mill, have better quality and higher yield.
The method of adding a thermal insulating layer was used to overcome the problem associated with the flow stress mismatch between the can and the billet during extrusion.
The thermal deformation problem in the continuous casting of a slab subjected to thermal loading because of the temperature gradient along the solidified shell thickness is investigated.
This research is useful for analyzing the bulging deformation in the continuous casting of a slab under the static pressure of the molten steel and the thermal loading because of the temperature gradient along the solidified shell thickness.
Coupled with previous studies, we suggest that the Guangtoushan biotite plagiogranites were likely to be caused by subducting slab break-off during the late orogenic stage in the West Qinling orogenic belt.
The blank reference experiment shows that hydrothermal crystallization treatment favors the formation of hexagonal tungsten trioxide, and the tungsten trioxide powder sample prepared by this method has a high degree of crystallinity.
Thereby these hydrogels exhibited a decreasing trend in dynamical mechanical properties with increasing the amount of α-CDs in regard to the blank hydrogel made without α-CD addition.
Stamping, which reduces to the flattening of a viscous blank or preform between two rigid surfaces, is one of the basic methods of obtaining thin-walled metal and especially plastic parts.
Using the Н47ХБ alloy sealed to С95-2 chemical glass as an example, it is shown that annealing of the alloy in humid hydrogen at a temperature of 1050-1100°C leads to formation of a durable oxide film on the surface of the blank.
By using self-made vibrating wavelike sloping plate (VWSP) setup, the process of preparing semisolid billets of light alloys by semi-continuous casting and thixo-forging process were studied.
Semisolid billets with fine spherical or rosette grains were prepared by the proposed process, and the solidified shell on the sloping plate surface can be effectively avoided.
The paper describes typical aws in axle billets manufactured by various steel works and classifies them in accordance with their metallographic characteristics.
Die Arbeit (?)ber die Verwendung von Magnesiatonen bei der Herstellung von Cordieritmassen wurde untersucht.Das Ergebnis zeigten dass, die Vers(?)tze, die Rohstoffe haupts(?)chlich aus den Magnesiatonen und zugeben die jinjounischen Tonen und verwittert Feldstap ksnn verfertigen die Massen, die 50～60% Cordierit enthielt, and das Sinterintervall bei Brennentemperaturen 1200℃ auf 50℃ erweitert konnen. Die Zusammensetzung derartige Massen ungef(?)hr entspricht dem Kristallpunk der Cordierit, Forsterit und Klin...
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