903results about "Work heating devices" patented technology

A rolling mill has roughing, intermediate and finishing roll stands on a first side of a billet reheating furnace, and a breakdown mill on an opposite second side of the furnace. Billets are heated to an elevated rolling temperature in the furnace and are then ejected to the second side of the furnace for rolling in the breakdown mill before being directed back through the furnace for continued rolling into finished products at the first side of the furnace in the roughing, intermediate and finishing roll stands.

The invention belongs to hot rolling equipment and a hot rolling method, and particularly relates to a method and a device for controlling the strip shape and the precision of hot rolling steel strips and plates. The invention regulates the deformation capacity of the metal by changing the temperature distribution in the width direction of rolled pieces so as to reach ideal strip shape control, i.e. an aerial fog cooling medium is accurately sprayed on the rolled pieces to change the temperature distribution in the width direction of the rolled pieces; the cooling parameters for spraying along the width of the rolled pieces are regulated according to the set and feedback information to realize the open-loop or closed-loop strip shape control; aerial fog cooling devices are arranged in front of and at the back of a reversing mill; and the aerial fog cooling devices in front of rolling mills and among the standers of the rolling mills in series-type hot steel strip rolled pieces and simultaneously spray the aerial fog on the upper and lower surfaces of the rolled pieces. The invention has simple structure and strong applicability, can be used for the strip shape control of the newly-built hot rolling mill or be used for carrying out improvement of the strip shape control on the rolling mill, is also suitable to roll the hot rolling steel strips and plates of the nonferrous metals and has wide popularization value.

Roll forging of an annular article of manufacture is accomplished with electric induction heating of the workpiece simultaneously during the roll forging process as required to keep the workpiece at optimum forging temperature during the roll forging process.

A method for manufacturing a seamless steel tube, wherein a tubing material for the seamless steel tube is produced by a hot working process from a material having less workability, such as a high Cr-high Ni-high C alloy steel including Cr at a content not less than 15 weight % and Ni at a content not less than 20 weight % or a ferritic stainless steel including Cr at a content not less than 16 weight %, and then cold drawn at a reduction rate of not less than 15% and further cold rolled after applying an appropriate heat treatment, so that a round or an inner grooved steel tube is obtained. It is preferable that the hot extrusion process is employed for the hot working process and a cold Pilger mill is employed for the cold rolling process. In the cold rolling process, the crackings or damage resulting from the reduced toughness of the tubing material as well as the breakage of a mandrel in producing the round or the inner grooved tube can be suppressed.

The invention relates to a method for producing ultrathin low-carbon steel by use of a thin slab casting and rolling process. The method comprises the following steps: continuously casting molten steel into a continuous cast billet with the width of 1,300-1,600 mm and the thickness of 60-100 mm; then sequentially conducting rough rolling, heat preservation by a heat holding cover, induction heating, high-pressure water phosphorus removal and finish rolling to obtain ultrathin strip steel with the width of 1,300-1,600 mm and the thickness of 0.8-1 mm; and finally, performing controlled cooling, roll-dividing cutting and roll take-up. A produced ultrathin low-carbon steel end product has the yield strength of 250-310 MPa, the tensile strength of 350-400 MPa and the ductility of larger than or equal to 35%. By adoption of the method, stable production of hot-rolled ultrathin low-carbon steel with the thickness of 0.8-1 mm can be realized, the dimensional accuracy, the flatness accuracy and the comprehensive mechanical property can be improved, the demand for 'replacement of cold product by hot product' is met and the production cost is lowered.

A hot rolling method and apparatus for producing hot rolled steel sheet free from variation in material properties in the width direction by making a temperature profile uniform over the entire width direction of a rough bar at a finishing mill entry side or exit side are provided, which hot rolling method of steel sheet heating a rolling material while changing a temperature rise in a width direction of the rolling material so that a temperature profile in a width direction of the rolling material at the finishing mill (7) entry side or exit side becomes uniform, for example, heating so that at least the temperature rise at a center of the rolling material in the width direction becomes greater than the temperature rises at intermediate parts between that center and the two edges in the width direction or heating so that the temperature rises at the two edges of the roughing mill in the width direction become greater than the temperature rises at the intermediate parts in the width direction of the width direction.

Surface defects in rolled steel are remedied by quenching a surface layer of the steel product downstream of the caster and upstream of the reheat furnace by transversely differentiated quenching to match the transverse temperature profile of the steel product. The flow rate of the quench spray is differentially adjustable across the width and optionally the length of the steel product. An array of spray nozzles controlled in transversely or longitudinally arranged groups provides the quench spray.

Ultrathin hot rolled steel strips are obtained from thin slabs using a continuous casting process and production line. The process and production line includes a secondary cooling system, a roughing mill, an induction heating zone to fix temperatures of the intermediate strip chosen between 1000 and 1400° C., a final rolling zone to reduce the thickness of the hot finished strip while keeping a controlled temperature of the hot rolled strip from the last stand of the finishing rolling mill higher than 750° C. The strip is cooled between the last stand of the finishing rolling mill and the coiling station using a specific T.T.T diagram (time-temperature-transformation) for steel quality and strip thickness. A control system is also provided with a master system and six further peripheric sub-systems.

A rolling method in a rolling line, to obtain strip with a thickness varying from 0.7 mm to 20 mm, for steel which can be cast in the form of thin slabs with a thickness from 30 mm to 140 mm, the line includes a continuous casting device; a tunnel furnace for maintenance/equalization and possible heating; a rolling train having a roughing train and a finishing train; a rapid heating unit, with elements able to be selectively activated, interposed between the roughing train and the finishing train. For each lay-out of the rolling line, the position of the rapid heating unit which defines the number of stands which form the roughing train, disposed upstream of the unit, and the number of stands which form the finishing train, disposed downstream of the unit, is calculated as a function of the product of the thickness and speed of the thin slab.

The invention provides a method for controlling the plate shape of hot-rolled thin-specification high-strength weather-resistant steel. The method comprises the steps of reasonably designing a heatingprocess, controlling the thickness of a rough-rolled intermediate billet, adopting low sleeve quantity for finish rolling, enabling the angle of a loop to be less than 20 DEG C, and enabling the large sleeve lifting torque to be 1.5-2.0 times of set tension, cooling water between F1 and F2 racks is increased to realize a final rolling high-acceleration mode, a front rack plate strip large-convexity self-stabilization control strategy and a rear rack equal-proportion convexity plate shape control strategy are adopted for the plate shape, edge shielding, sectional control cooling and off-line slow cooling measures are adopted in the cooling process, the plate shape of high-strength thin-specification weather-resistant steel is greatly improved, and unevenness of the strip steel is less thanor equal to 3.0mm/m. and batch stable production of hot-rolled thin-specification high-strength weather-resistant steel is realized.

The invention discloses a novel planetary tube rolling mill and a planetary rolling method for copper alloy tubes. The planetary tube rolling mill comprises a feed mechanism used for conveying hollow casting blanks, and a planetary main frame used for casting and rolling the hollow casting blanks. A roller set and a rolling die quick cooling mechanism are arranged in the planetary main frame; an induction preheating mechanism for preheating the hollow casting blanks is arranged between the discharge end of the feed mechanism and the feed end of the planetary main frame; the discharge end of the planetary main frame is sequentially provided with an induction soaking mechanism and a slow cooling mechanism; and tubes rolled and quickly cooled are heated by the induction soaking mechanism andthe heated tubes are slowly cooled by the slow cooling mechanism. The novel planetary tube rolling mill can replace the matching of an extrusion procedure with a horizontal caster, a straightening and milling machine, a continuous tensioning machine, an online continuous cutting machine and the like, and realizes automatic, continuous and short-flow production of high-quality copper alloy tubes.

A device for blowing gas on a face of traveling strip material, comprising at least one hollow box having its wall fitted with a plurality of blow orifices, thereby enabling gas to be directed towards said face of the strip material. The hollow box is also fitted laterally on at least one side thereof relative to a midplane (Q) perpendicular to the plane in the strip with a movable shutter member having the function of selectively shutting some of the blow orifices. In order to adapt the width of the blow zone to the width of the corresponding strip material, said movable shutter member has an edge adjacent to the inside surface of the wall fitted with the blow orifices, and an edge adjacent to a side wall of the hollow box.

The invention discloses a titanium plate hot continuous rolling large-scale manufacturing method. The titanium plate hot continuous rolling large-scale manufacturing method comprises the following steps of: step (1) heating; (2) carrying out rough rolling; step (3) carrying out finish rolling; step (4) crimping; step (5) welding; and step (6) pickling and annealing. According to the titanium platehot continuous rolling large-scale manufacturing method, the temperature required for rolling a titanium plate is ensured by arranging a heat preservation cover on a conveying roller; before an titanium ingot is heated, the edge of the titanium ingot is chamfered, and the chamfering reduces the drum type deformation of the edge of the titanium plate and ensures the shape of a plate formed by rolling the titanium plate.

The invention relates to a method for the manufacture of flat bars, also wide, from thick, medium or thin slabs in a production plant (1) comprising a single-stand or multi-stand Roughing mill (4), a roller table (3) for transporting and possibly oscillating the rolling stock, a roller table section with a reversible heat-insulating cover (5), a straightening device for straightening the rough rolling stock ( 6), an inductive heating device (7), especially an induction heating device (7), a multi-stand finishing mill (10), a strip There is a device (11) for cooling the hot strip and an output roller table of the post-coiler (12) for coiling the finished strip. In a single-stand or double-stand roughing mill, one or more slabs made of medium carbon steel or alloy carburizing steel or alloy quenched and tempered steel with a carbon content of about 0.2%-0.8% pass on the roller table Oscillating and paused for intercooling are rolled into one or more rough strips in two stages. The rough strip is heated to a specified temperature over its entire width and length by the combined action of the cover and the induction heating device and rolled into a high-strength finish in a multi-stand finishing mill in a dual-phase zone. thin ribbon.

An electric heating type rolling device comprises work rolls for rolling a metal strip, a power supply for generating a pulse current, a pair of upstream contact members which are disposed in a location before the metal strip passes through the work rolls, and a pair of downstream contact members which are disposed opposite to the upstream contact members in a location after the metal strip has been rolled by the work rolls and passed thereby. The contact members are electrically connected to the power supply. Each contact member includes a first contact portion contacting the metal strip, a flat portion which is extended from the first contact portion toward the work rolls while being spaced apart from the metal strip, and a second contact portion which is extended from the flat portion to contact the metal strip.

Disclosed is a method for manufacturing hot rolled steel sheets. The method includes the steps of passing molten steel through a continuous caster (11) having a mold after having been passed through a ladle (91) and a tundish (92) to manufacture a slab; cutting the slab to predetermined lengths using a cutter (14a) to form a plurality of cut slabs; heating the cut slabs to a predetermined temperature in a first heating furnace (15a) descaling the cut slabs heated in the first heating furnace; rolling the slabs in a reduction unit (13) to a predetermined thickness to form a plurality of flat bars; heating the flat bars to a predetermined temperature in a second heating furnace (15b); coiling the flat bars by a coiling station (16a) while the flat bars are maintained in a heated state; uncoiling the flat bars by an uncoiler (16b); and rolling the flat bars to a predetermined thickness in a finishing mill.

The invention relates to a continuous casting and continuous rolling manufacturing process of H13 round steel for hot working molds with specifications of phi 50 mm to phi 150 mm; the alloy content ofthe steel is 9%; arc billet continuous casting machines with sections above 300*400 mm are used for continuous casting; and a 850 reversible and continuous casting unit is used for rolling. As the alloy content of the steel is higher, the bad segregation, middle cracks and center cracks are easily generated in the solidification process, the deformation resistance in the continuous casting process is high, the surface rolling defects are easily generated, the welding is difficult in the rolling process due to internal looseness, the cracking phenomenon is easily generated through air coolingafter rolling, and the quality of rolled materials and final products is badly influenced. A continuous casting electromagnetic stirring technology, a light pressing technology and an ultraweak cold technology are applied, and such processes as high-temperature dispersion and belt temperature annealing are combined to effectively control the grade of belt structures, to prevent center cracks and surface cracks of continuous-cast blanks and cooling stress cracks of the rolled materials and to improve the ultrasonic flaw detection pass percent of the rolled materials and the pass percentage of the belt structures.

A process for manufacturing steel long products provides for starting from a continuous casting step with liquid core reduction, followed by induction heating without interruption until the end of a rolling step in a plurality of stands. The blooms or billets subjected to such a process have initial thickness in the range between 120 and 400 mm and a high “mass flow” passing in the time unit at the outlet from the continuous casting, as well as an average temperature in the cross-section which is higher than the surface temperature, being in the core or inner middle region higher by 100° C. than on the surface, that is of about 1200° C. A plant for carrying out such a process is also described.