摘要:
A method for annealing a strip of steel having a variable thickness in its length direction with at least thicker and thinner sections, wherein the strip has been cold rolled to form the thicker and thinner sections, one thicker and one thinner section having a length of at most a few meter. The annealing is performed by continuous annealing.
摘要:
A bent member having excellent dimensional accuracy is manufactured by stably forming a high temperature portion uniformly in the circumferential direction of a steel tube and in a narrow region in the axial direction of the steel tube using a manufacturing apparatus of Patent Document 1. A bent member is manufactured by supporting a steel tube 1 at a first position while feeding it, performing induction heating of the steel tube at a second position B with an induction heating coil 14, cooling the steel tube 1 at a third position C to form a high temperature portion 1a which moves in the axial direction of the steel tube 1, and three-dimensionally varying the position of a gripping mechanism 15 for the steel tube 1 in a region D to apply a bending moment to the high temperature portion 1a. When the wall thickness of the steel tube 1 is at most 2.0 mm, the feed speed V of the steel tube 1 is made 5 - 150 mm/sec, and an alternating current at 5 - 100 kHz is supplied to an induction heating coil 14 having 1 winding. When the wall thickness of the steel tube 1 is greater than 2.0 mm and at most 3.0 mm, an induction heating coil 14 having 2 windings is used, and the current frequency f (kHz) of the alternating current supplied to the induction heating coil 14 and the feed speed V (mm/sec) of the steel tube 1 are adjusted so as to satisfy f
摘要:
The invention relates to a method for controlling the surface reactions on a steel strip (5) running through a furnace (1) comprising successively a first section (2), a second section (3) and a third section (4), the atmosphere in the second (3) and third (4) sections being oxidizing and reducing respectively, wherein in the first section (2), the atmosphere is slightly oxidizing to potentially form an iron oxide layer with a H 2 content inferior to 2%, a O 2 content inferior to 0.1% and a H 2 O or CO 2 , or H 2 O+CO 2 content superior to 0.03% and, preferably, superior to 0.035%, the percentages being expressed in volume.
摘要:
An apparatus for hardening a spring (400; 410) having a helical or beehive shape. The apparatus has a rotation support system and an induction heating system. The rotation support system is designed to support the spring while the spring is heated by the induction heating system. The induction heating system has an induction coil system having a coil system. The coil system has a spaced region designed to receive the spring and to heat the spring while the spring is supported on the rotation support system.
摘要:
It was learned that in an insulation heating coil used for continuously heating a running steel sheet, the conventional insulated structure of the induction heating coil was selected focusing on the heat resistance and insulation ability of the insulation itself and cannot prevent a drop in insulation ability due to entry of fine metal particles (for example, zinc fumes) in the surroundings. Therefore, an insulated structure of induction heating coil preventing the entry of zinc fumes and other fine metal particles, not falling in strength even in a high temperature environment, and able to extend the service life of the induction coil is provided. Specifically, the surface of the induction heating coil is covered with a ceramic cloth made of alumina-silica ceramic long-fibers not containing boron and the surface of that is formed with a heat-resistant insulation layer made of a surface hardening ceramic material containing alumina or alumina-silica fine particles and alumina-silica ceramic short-fibers.
摘要:
The transverse flux induction heating device is allows an alternating magnetic field to intersect the sheet face of a conductive sheet which is conveyed in one direction, thereby inductively heating the conductive sheet. The transverse flux induction heating device includes a heating coil disposed such that a coil face faces the sheet face of the conductive sheet; a core around which the heating coil is coiled; a shielding plate formed of a conductor and disposed between the core and a side end portion in the direction perpendicular to a conveyance direction of the conductive sheet; and a non-conductive soft magnetic material which is attached to the shielding plate, wherein the shielding plate is interposed between the core and the non-conductive soft magnetic material.
摘要:
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Aufbereiten von Walzgut (5,16,22) aus Stahl vor dem Warmwalzen. Aufgabe der Erfindung ist es, ein energieeffizientes Verfahren und eine kompakte Vorrichtung zur Aufbereitung von Walzgut zu finden, mit denen das Walzgut auch bei transienten, rasch wechselnden Geschwindigkeiten zuverlässig erwärmt und dennoch gründlich entzundert wird. Diese Aufgabe wird durch ein Verfahren mit den Schritten gelöst: - Vorwärmen des Walzguts (5,16,22) in einem ersten Induktionsofen (6), sodass das vorgewärmte Walzgut mit einer Oberflächentemperatur T 1 ≥ 1000 °C in eine nachfolgende Entzunderungseinrichtung (7) eintritt; anschließend - Entzundern des vorgewärmten Walzguts mittels mehrerer Wasserstrahlen in der Entzunderungseinrichtung (7); unmittelbar anschließend - Erwärmen des entzunderten Walzguts in einem zweiten Induktionsofen (8), wobei das entzunderte Walzgut mit einer Temperatur T 2 ≥ T Curie des Walzguts in den zweiten Induktionsofen (8) eintritt und die Erwärmung im zweiten Induktionsofen entweder in einer weitgehend inerten oder weitgehend reduzierenden Schutzgasatmosphäre erfolgt; unmittelbar anschließend - Warmwalzen des erwärmten Walzguts in einem Walzwerk (9), wobei das erwärmte Walzgut mit einer Temperatur 1220 °C ≥ T 3 ≥ 1050 °C in das Walzwerk (9) eintritt.
摘要:
The invention relates to a method for producing a sheet steel component having areas of different hardness or ductility, wherein either the sheet steel is cold formed into the component in a tool from a blank and the formed component is then heated to a temperature above the austenitizing temperature and is inserted into a second tool for the purpose of hardening and is quench-hardened in the second tool, or wherein a blank is heated to a temperature above the austenitizing temperature and then is inserted into a forming tool for the purpose of forming and quench-hardening, is formed and quench-hardened there, wherein either during quench-hardening, in areas that should receive a lower hardness or higher ductility, energy is introduced into said areas using at least one induction coil in such a way that a reduced or no quench-hardening takes place, because the cooling down takes place at a temperature above the critical hardening rate, or the temperature in said area is held at a desired higher level until shaping, or the hardened component, after shaping, is bought into or onto another form after the shaping, in or on which inductive action are applied to the component in partial areas in such a way that the existing hardness is partially or completely eliminated.