摘要:
In a continuous process for continuous casting and hot-rolling of metal sheet, off-line storage of a slab takes place in a thermally insulated storage chamber located alongside a thermally insulated zone through which the slab lengths travel in the production line between a cutter for the slab and the hot-rolling mill train. On stoppage of the hot-rolling mill train, at least one slab length is transferred laterally to the off-line thermally insulated storage chamber. To improve ductility, an induction heating stage is combined with a subsequent temperature-maintaining stage in the furnace for homogenization of temperature within the slab. Both these stages are performed on the slab at its casting thickness.
摘要:
The apparatus is formed by confronting wide side mold walls and confronting narrow side mold walls, The narrow side mold walls are composed of an electrically conductive refractory material and are directly heated. Each of the narrow side mold walls include an upper squeezed portion and a lower parallel portion, The upper squeezed portion has a surface in contact with the molten metal which converges in width along a casting direction. The lower parallel portion has surface in contact with the molten metal which is substantially uniform in width.
摘要:
The integrated manufacturing system is formed by the combination of a continuous casting apparatus and hot rolling mills. The continuous casting apparatus is formed by confronting wide side mold walls and confronting narrow side mold walls. The narrow side mold walls are composed of an electrically conductive refractory material and are directly heated. Each of the narrow side mold walls include an upper squeezed portion and a lower parallel portion. The upper squeezed portion has a surface in contact with the molten metal which converges in width along a casting direction. The lower parallel portion has a surface in contact with the molten metal which is substantially uniform in width.
摘要:
By rolling a slab with a thickness of 80 mm or less in a plant including a continuous casting machine and a hot strip rolling mill directly combined with each other, low-speed rolling can be achieved while suppressing a drop of the strip temperature and the occurrence of scales. After a slab 2 cast by a continuous casting machine 1 and being 80 mm or less thick is heated and descaled, it is rough-rolled into a bar with a thickness of 20 to 60 mm by a roughing mill 7 constructed as a 4H-twin mill. After being heated and descaled again, the bar is finish-rolled by finishing mills 19 to 21, each of which employs small-diameter work rolls having a diameter not larger than 500 mm, into a thin plate with a thickness in the range of 1.6 mm to 15 mm or a thick plate with a thickness in the range of 3 mm to 40 mm. The rolling speed on the delivery side of the finishing mills 19 to 21 is set to be as low as 350 m/minute or less with a result of small production scale, and the plant length is set to be not longer than 100 m with a result of small plant space.
摘要:
A glow discharge generating apparatus comprises, in a glow discharge chamber, an anode, a cathode for generating a glow discharge between the cathode and the anode upon application of a negative pulse, and a triggering electrode for starting the glow discharge. To stabilize the glow discharge, the electron density distribution in the vicinity of the surface of the cathode is made uniform only during at least part of a continuous period of the glow discharge.
摘要:
In order to provide a manufacturing device and a manufacturing method for a hot-rolled steel strip, which are capable of obtaining the desired quality of material by rapid uniform cooling immediately after rolling, and improving yield by early sheet tension and sheet shape measurements, a manufacturing device for a hot-rolled steel strip is provided with a finishing rolling mill line (11), a first cooling unit (13) installed just behind the exit side of the finishing rolling mill line, and a pinch roll (14) which is installed on the exit side of the first cooling unit and in contact with both the upper and lower surfaces of a strip (S), at least a wiping roll (15) located on the upper side of the strip (S) is disposed between the first cooling unit and the pinch roll, and a tension/shape measuring unit (16) for measuring the tension and shape of the strip (S); is installed between the wiping roll and the pinch roll.
摘要:
An endless hot rolling material shear-joining method capable of threading hot rolling materials in a finish rolling process without strip breakage by controlling joining conditions for the hot rolling materials in an endless hot rolling process for high carbon steel, and an endless hot rolling plant therefor are disclosed. The shear-joining method for endless hot rolling materials of high carbon steel includes shear-joining high carbon steel metal bars comprising, in terms of weight %, 0.30% to 1.20% C, inevitable impurities, and balance Fe, or comprising 0.15% to 1.5% C containing at least one of Cr, Ni, Mo, V, Ti, W, B, Nb, and Sb, inevitable impurities, and balance Fe, such that a joined surface of the joined metal bars is formed to be inclined in a thickness direction of the metal bars, in a hot rolling plant by a joiner adapted to join the metal bars after overlapping tail part of a leading one of the metal bar and top part of a trailing metal bar.
摘要:
An endless hot rolling material shear-joining method capable of threading hot rolling materials in a finish rolling process without strip breakage by controlling joining conditions for the hot rolling materials in an endless hot rolling process for high carbon steel, and an endless hot rolling plant therefor are disclosed. The shear-joining method for endless hot rolling materials of high carbon steel includes shear-joining high carbon steel metal bars comprising, in terms of weight %, 0.30% to 1.20% C, inevitable impurities, and balance Fe, or comprising 0.15% to 1.5% C containing at least one of Cr, Ni, Mo, V, Ti, W, B, Nb, and Sb, inevitable impurities, and balance Fe, such that a joined surface of the joined metal bars is formed to be inclined in a thickness direction of the metal bars, in a hot rolling plant by a joiner adapted to join the metal bars after overlapping tail part of a leading one of the metal bar and top part of a trailing metal bar.
摘要:
Provided is a cooling apparatus discharging water smoothly corresponding to increase of volume density of cooling water securing a high cooling capability. The apparatus disposed on downstream side from a row of hot finish rolling mill, supplying cooling water from above toward a pass line, includes a plurality of cooling nozzles arranged parallel in a pass line direction, and an upper surface guide disposed between the pass line and the cooling nozzles, wherein a predetermined relation is satisfied when defining: a volume density of cooling water sprayed as qm(m3/(m2·sec)); a pitch of the cooling nozzle in the pass line direction as L(m); a distance between a lower surface of the upper surface guide and the pass line as hp(m); a uniform cooling width as Wu(m); and a cross-sectional area of virtual flow path of discharging water flowing in a width direction of steel sheet as S(m2).
摘要:
In order to provide a manufacturing device and a manufacturing method for a hot-rolled steel strip, which are capable of obtaining the desired quality of material by rapid uniform cooling immediately after rolling, and improving yield by early sheet tension and sheet shape measurements, a manufacturing device for a hot-rolled steel strip is provided with a finishing rolling mill line (11), a first cooling unit (13) installed just behind the exit side of the finishing rolling mill line, and a pinch roll (14) which is installed on the exit side of the first cooling unit and in contact with both the upper and lower surfaces of a strip (S), at least a wiping roll (15) located on the upper side of the strip (S) is disposed between the first cooling unit and the pinch roll, and a tension/shape measuring unit (16) for measuring the tension and shape of the strip (S); is installed between the wiping roll and the pinch roll.