摘要:
The invention relates to a device and to a method to diffuse Al—Si into a surface of an Al—Si-coated steel sheet. First of all, a steel sheet is fed into a furnace that can be heated up to the diffusion temperature and subsequently, it is conveyed contactlessly through the furnace that has been heated up to the diffusion temperature. In this process, the steel sheet is heated up to the diffusion temperature, whereby the Al—Si diffuses into a surface of the steel sheet. Subsequently, the steel sheet with the Al—Si that has diffused into a surface is cooled off at a rate of less than approximately 25K/sec.
摘要:
A nozzle array for levitational guidance of web material. The nozzle array includes a sequence of nozzle areas in the transport direction of the web which are peripherally encompassed at least in part by fanned jets and their width varies in the direction transversely to the web transport direction. The nozzle areas may be equipped with orifice nozzles. Located between the nozzle areas are return flow zones which may be configured as return flow passageways open towards the web, whereby their cross-section is flared in the direction of the edges of the nozzle array. The nozzle areas may be v-shaped relative to their longitudinal axis oriented in the transport direction of the web. Clusters of nozzle areas may be arranged juxtaposed as viewed in the web transport direction.
摘要:
A heating system for heat treating a continuous sheet-like material includes an input end and an output end and a path defined therebetween that extends between the input and output ends for the material to be treated. At least one section of the heating system includes an upper movable heater and a lower stationary heater disposed on confrontingly opposite sides of the material path. A heater lifter is connected to the movable upper heater for operatively displacing the upper heater between a first position for imparting a curing type of heat treatment and a second position for imparting an annealing type of heat treatment to the continuous sheet material as it is advanced through the heating system.
摘要:
In the furnace a plurality of floaters are arranged in series in a direction in which the metal strip is transferred. The strip is fed through the furnace, floated by these floaters. A test floater is installed along the strip transfer pathway. The height of the strip floated by the test floater is detected by a float sensor. The gas pressure of the test floater detected when the test floater floats the strip to an appropriate height is reflected on the gas pressures of the in-furnace floaters. As a result, the in-furnace floaters float the strip to the appropriate height.
摘要:
The present invention relates to method and apparatus for heating a strip of metallic material in a continuous annealing furnace and more particularly to an improvement relating to a method and apparatus for heating a strip of metallic material in a continuous annealing furnace in which annealing of the strip is continuously carried out in such a manner that a gas, serving to adjust temperature of the strip, is blown toward the strip through a plurality of gas jet nozzles which are arranged on one side or both sides of the strip, wherein the temperature and flow rate of the strip are properly determined to a required level in response to the changing of the operating conditions such as the heat cycle, line speed, thickness of strip, width of strip and the like. Further, the present invention relates to a method and apparatus for heating a strip of metallic material in a continuous annealing furnace, wherein the temperature of the strip is controlled to reach a target temperature by heating or cooling the strip by means of a gas jet or the like having excellent respondency at a part of the heating zone in the continuous annealing furnace whereby irregular annealing of the strip is effectively inhibited.
摘要:
Apparatus for conveying strip materials while floating them whereby a strip is allowed to pass between a pair of plenum chambers vertically spaced apart from each other and provided with blowoff openings through which gases are blown against the strip to float it as well as heat or cool the same. After the gases have been blown against the strip, a portion of them streams in one direction crossing the predetermined conveyance course of the strip, while the other portion thereof streams in the opposite direction. A pair of flow-rate control means are provided in conjunction with the plenum chambers and in opposite positions so as to vary the amount of gases streaming in said one direction in relation to that of those streaming in the other direction, when the strip has taken a winding course during conveyance, so that the strip is restored to its predetermined course of conveyance.
摘要:
During the process of movement of an aluminum strip in a floating mode, the strip is first heated and then cooled for the annealing. In cooling the aluminum strip, the aluminum strip is first cooled to a predetermined temperature at an easy cooling temperature gradient, and subsequently cooled to a room temperature at a sharper cooling temperature gradient than the former. During the process of the cooling, a significant thermal stress is not produced in the aluminum strip, and the aluminum strip is cooled without being wrinkled.
摘要:
A treatment plant for web material which, when bent, exhibits stiffness transverse to the direction of bending. The treatment plant comprises a series of blow boxes arranged in sections with the boxes in each section having parallel plane perforated surfaces on opposite sides of the web path. The perforations are graduated in degree with a high degree of perforation on one side of the web path being opposed by a low degree of perforation on the other side of the web path, and vice versa, so that the web assumes a wave shape between the first and second planes, the wave staying with its nodes in definite positions closer to the one plane opposite the highly perforated group in the second plane and closer to the second plane opposite the highly perforated group in the one plane.
摘要:
The invention provides a process for the heat treatment of steel products, in particular of steel strips or sheets, in which the product is brought from a starting temperature to a target temperature in a booster zone having at least one burner; the burner is operated with a fuel, in particular a fuel gas, and an oxygen-containing gas which contains more than 21% oxygen; and the product is brought into direct contact with the flame generated by the burner, the air ratio λ within the flame being set as a function of the starting temperature and/or the target temperature.
摘要:
The invention provides a process for the heat treatment of steel products, in particular of steel strips or sheets, in which the product is brought from a starting temperature to a target temperature in a booster zone having at least one burner; the burner is operated with a fuel, in particular a fuel gas, and an oxygen-containing gas which contains more than 21% oxygen; and the product is brought into direct contact with the flame generated by the burner, the air ratio λ within the flame being set as a function of the starting temperature and/or the target temperature.