916results 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 discloses a wire rod used for an ultrahigh-strength steel cord and a manufacture method of the wire rod. The manufacture method includes the steel smelting stage, the blank casting stage, the cogging stage, the rolling stage and the controlled cooling stage which are sequentially conducted. In the steel smelting stage, molten steel is smelted, wherein the number density of inclusionswith the size being larger than or equal to 5 micrometers is smaller than or equal to 0.5 / mm<2>, and the inclusion size is smaller than or equal to 30 micrometers. In the blank casting stage, tappingmolten steel of the steel smelting stage is cast into an ingot blank with the central carbon segregation being 0.92 to 1.08. In the cogging stage, the ingot blank is made into an intermediate billetwith the central carbon segregation being 0.95 to 1.05 through cogging. In the rolling stage, the intermediate billet is rolled into the wire rod. In the controlled cooling stage, temperature-controlled cooling is conducted on the wire rod, and the wire rod which is high in cleanliness and high in homogeneity and has the tensile strength being smaller than or equal to 1150 MPa is obtained. The wire rod can be used for the ultrahigh-strength steel cord with the monofilament tensile strength being larger than or equal to 3600 MPa, the low drawing wire breaking rate, the low stranding wire breaking rate and the low mold consumption can be ensured, and the high yield is ensured.

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.

A composite metal article from two dissimilar metals is prepared. A metal base is comprised of a first metal and having first and second opposing surfaces and a least one longitudinally-positioned depression in each of the first and second opposing surfaces for receiving a wire. An elongated metal element comprised of a second metal is introduced into each of the at least one first and second depressions of the metal base to form a composite assembly, and the composite assembly is heated under pressure to urge the adjacent surfaces of the second metal elements and the depressions together to form a bonded article.

The invention provides a different-temperature rolling method for preparing a stainless steel and carbon steel composite board. The different-temperature rolling method comprises the following steps: S1, blank preparation; S2, composite blank pre-heating; S3, composite blank induction-heating; S4, different-temperature rolling. An electromagnetic induction heating method is introduced into a hot-rolling composite process for preparing the stainless steel and carbon steel composite board to perform secondary heating on a stainless steel layer of an integrally-heated composite blank; the deformation resistance difference between the stainless steel layer and a carbon steel layer is reduced through controlling the temperature difference between the stainless steel layer and the carbon steel layer of the composite blank, so that the deformation of the stainless steel layer and the carbon steel layer in the rolling deformation process is more coordinated, therefore, the warping after a single-sided stainless steel composite blank is rolled can be reduced, even eliminated, and the internal residual stress after a double-sided stainless steel composite blank is rolled can be reduced.

The invention relates to a method for using a thin slab continuous casting and rolling technology for producing thin-specification, low-alloy and high-strength steel. Molten steel is continuously cast into a continuous casting blank with the width being 1300 mm to 1600 mm and the thickness being 65 mm to 96 mm; then rough rolling, heat insulation cover heat insulation, induction heating, high-pressure water scale removing and finish rolling are conducted in sequence, and ultrathin strip steel with the width being 1300 mm to 1600 mm and the thickness being 1.3 mm to 1.6 mm is obtained; and finally the strip steel is controlled to be cooled, shorn in different rolled and are coiled into rolls. The yield strength of the thin-specification double-phase steel finished product ranges from 380 MPa to 430 MPa, the tensile strength ranges from 530 MPa to 610 MPa, and the elongation is larger than or equal to 25%. By means of the method, stable production of hot rolled thin-specification, low-alloy and high-strength steel with the thickness being 1.3 mm to 1.6 mm can be achieved, the size precision, the plate shape precision and the comprehensive mechanical performance are improved, the requirement for replacing cold with hot is met, and the production cost is reduced.

PCT No. PCT / JP97 / 00826 Sec. 371 Date Nov. 12, 1997 Sec. 102(e) Date Nov. 12, 1997 PCT Filed Mar. 14, 1997 PCT Pub. No. WO97 / 33706 PCT Pub. Date Sep. 18, 1997A steel slab is rough-rolled into a sheet bar and butt-joined onto a preceding sheet bar and a widthwise end portion of the sheet bar is heated by means of an edge heater and then subjected to a continuous finish rolling through pair-cross rolls rolling on at least 3 stands to provide a hot rolled steel strip having a width of not less than 950 mm, a thickness of 0.5-2 mm and a crown within + / -40 mu m, and the hot rolled steel strip is subjected to cold rolling, continuous annealing, temper rolling and, if necessary, plating treatment on the surface of the cold rolled steel strip, whereby there is obtained a steel sheet having an average thickness of not more than 0.20 mm and a width of not less than 950 mm, a thickness variation quantity in a widthwise direction is within + / -4% of the average thickness in a region corresponding to not less than 95% of the width of the steel sheet as cold rolled and a hardness (HR30T) variation in the widthwise direction is within + / -3 of an average hardness.

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.

The invention relates to a compact, flexible CSP facility (1,101,201,301,401) for continuous, semi-continuous and batch operation, comprising a casting machine, a roughing stand group (7,111,211) and a finishing stand group (12,118,218), wherein a coil store (8,113,213,501) which stores the rough strip or slab coming from the roughing stand is integrated in the roller table for batch or semi-continuous operation, wherein the coil store is deactivated in continuous operation. The coil store (8,113,213,501) is designed to hold an increased quantity of rough strips or slabs in such a way that two, three or more rough strips or slabs can be wound onto a coil to form jumbo coils.

An apparatus and process are provided for supporting a billet inside an induction coil while the billet is being heated by electric induction. Two or more rails of a heat resistant ceramic material provide a curvilinear surface on which the billet can slide into and out of the coil and sit on during the heating process. Rail position adjustment means may be provided for moving the rails to accommodate billets of various sizes.

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 manufacturing method for a titanium alloy large-specification ring piece with a basket-weave microstructure, in particular to a manufacturing method for an alpha + beta two-phase titanium alloy large-specification ring piece. The manufacturing method is characterized by comprising the following steps that 1) a titanium alloy blank is heated to 20-50 DEG C below a beta phase transformation point, upset, punched and shaped to obtain a ring rolling blank; 2) then the ring rolling blank is reamed at the 20-50 DEG C below the phase transformation point to the process size;and 3) then the ring rolling blank is ring-rolled and formed at 25-80 DEG C above the phase transformation point; and finally solid solution + aging dual heat treatment is carried out to obtain the titanium alloy ring piece. The titanium alloy ring piece prepared through adopting the process is the basket-weave microstructure, has high fracture toughness, durability, and creep resistance, and meets the design requirements of the high damage tolerance and durability and the creep resistance of annular components such as a machine box, and a force application cylinder for an aerospace engine ona titanium alloy material better.

A method for producing a hot-rolled steel strip from a steel melt in a continuous production process, with the strip running through uninterruptedly, comprises the following method steps: continuous casting of a steel strand (5) in a continuous casting mould (2) of a continuous casting installation (1), roll forming of the cast steel strand in a first group of roll stands (6) to form a pre-rolled hot strip (7), further roll forming of the pre-rolled hot strip in a second group of roll stands (19) to form a hot-rolled steel strip (21), setting the pre-rolled hot strip to rolling temperature between the first group of roll stands and the second group of roll stands in a temperature setting device (14), and winding up the hot-rolled steel strip into coils or dividing up the hot-rolled steel strip into panels. In order to increase flexibility in the production of different grades of steel and keep investment costs and operating costs low, it is proposed that the pre-rolled hot strip is descaled immediately before entering the temperature setting device, the pre-rolled hot strip is kept in a protective gas atmosphere in the temperature setting device and the pre-rolled hot strip is roll-formed in the second group of roll stands immediately after running through the temperature setting device. Furthermore, a combined casting and rolling installation for carrying out the method is proposed.

A raw material to be rolled made of a high-chromium high-nickel alloy steel containing, in terms of mass%, 20-30% chromium, 30-50% nickel, and at least one of molybdenum and tungsten, the amount of the latter two being 1.5% or more in terms of Mo+0.5W, is subjected to oblique piercing rolling under the conditions of a roll-gouge peripheral speed of 2.3 m / sec or higher after the raw material to be rolled is heated under the conditions satisfying the following relationship (1). Thus, the inner surface can be prevented from developing a rash through melting and plug life can be prolonged. T=1575-4.45OEf-104.7OE-ln(th / r0)} (1) T means the heating temperature ( DEG C), Vf means the roll-gouge peripheral speed (m / sec), r0 means the radius of the inlet-side raw billet (mm), and th means the wall thickness of the raw pipe after piercing (mm).

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.

Continuously cast slabs production comprises using device having blooming train (4), roller table (3) for transporting rolled material, roller table section (5) with hoods, unit for leveling pre-strips, inductive device (7) for heating pre-strips to defined temperature, finishing train (10), delivery roller table with devices for cooling hot strip and coiling machines for coiling finished strip. One or more slabs made of carbon steel containing 0.2-0.8% carbon are rolled to pre-strips in the blooming train. The pre-strips are heated to a defined temperature using the combined action of the hood and the heating device, and then rolled. The rolling temperature lying in the upper austenite region in the first deformation stage in the blooming train leads to a conversion of a continuous cast structure to a rolled structure by complete recrystallization. An independent claim is also included for a device for carrying out the process.

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.

Provided is a manufacturing method of a hot-rolled steel sheet which enables manufacturing of a hot-rolled steel sheet having excellent surface properties and a fine structure. The manufacturing method of a hot-rolled steel sheet uses a heating device, descaling device, row of finishing mills, cooling device disposed in the row of finishing mills, and rapid cooling device disposed immediately after the row of finishing mills, and the operations of the heating device, cooling device and rapid cooling device are controlled, thereby controlling a temperature T1 of the material to be rolled on an entry side of the row of finishing mills, a temperature T2 of the material to be rolled on an entry side of a final stand in the row of finishing mills, and a temperature T3 of the material to be rolled on an exit side of the rapid cooling device.