A heating device for an annular component is provided. The heating device is configured to heat the annular component via hot gas flow, and includes a gas flow heater, a draught fan, and an annular cavity for accommodating the annular component. An outer wall of the annular cavity is provided with a gas flow inlet and a gas flow outlet, the gas flow heater heats a gas flow, and the draught fan enables the gas flow to enter into the gas flow inlet, pass through a gas flow passage in the annular cavity, and be discharged via the gas flow outlet.

A heating device for an annular component is provided. The heating device is configured to heat the annular component via hot gas flow, and includes a gas flow heater, a draught fan, and an annular cavity for accommodating the annular component. An outer wall of the annular cavity is provided with a gas flow inlet and a gas flow outlet, the gas flow heater heats a gas flow, and the draught fan enables the gas flow to enter into the gas flow inlet, pass through a gas flow passage in the annular cavity, and be discharged via the gas flow outlet.

The present invention relates to a batch furnace for annealing material comprising a furnace housing which has a closable loading opening, a receiving chamber for furnace material and a device for convective heat transfer to the furnace material by a heat transfer medium, wherein the device for convective heat transfer comprises at least one heating device and at least one fan which is arranged in the furnace housing wherein the receiving chamber is arranged on the suction side of the fan and at least one nozzle array is arranged on the pressure side of the fan, wherein the nozzle array has a central opening which forms an intake duct of the fan and the nozzle array projects radially beyond the fan. The invention further relates to a method for heat treatment of a furnace material.

In the present disclosure, a motor core can be degreased prior to straightening annealing without a heating device or a vacuum device dedicated to degreasing being provided. A heat treatment furnace according to an embodiment of the present disclosure includes a degreasing chamber for degreasing a motor core, a heating chamber with which the degreasing chamber directly communicates and which is configured to anneal the motor core that has passed through the degreasing chamber, by using a converted gas generated by a converted gas generation device, as an in-furnace atmosphere gas, and a gas flow formation section GF configured in such a manner that the converted gas in the heating chamber flows toward the degreasing chamber.

A heat treatment plant for continuous heat treatment of a metal strip has an annealing furnace and a subsequent over-ageing chamber that can be heated. In this plant, the metal strip is guided over several deflector rolls spaced vertically apart in the over-ageing chamber so that it passes through the over-ageing chamber in a meandering path. At least one deflector roll can be moved in vertical direction so that the strip length and the retention time of the metal strip in the over-ageing chamber can be set. A method for heat-treating a metal strip is also disclosed.

A heat treatment plant for continuous heat treatment of a metal strip has an annealing furnace and a subsequent over-ageing chamber that can be heated. In this plant, the metal strip is guided over several deflector rolls spaced vertically apart in the over-ageing chamber so that it passes through the over-ageing chamber in a meandering path. At least one deflector roll can be moved in vertical direction so that the strip length and the retention time of the metal strip in the over-ageing chamber can be set. A method for heat-treating a metal strip is also disclosed.

The invention relates to a chamber (1) for the controlled oxidation of metal strips in a furnace for annealing a continuous production line of strips which are hot-coated, for example by galvanisation, the oxidation chamber allowing the oxidation of the metal strips by means of an oxidising gas injected on at least one of the faces of a strip (15), the oxidation chamber comprising oxidation portions (17) extending over the width and/or length thereof, each portion comprising at least one blow opening (4) and at least one suction opening (5) between which an oxidising gas circulates, each portion being controllable in a different way so as to adjust the oxidation induced on the strip over the width and length of the oxidation chamber.

A heating furnace for heating an annular component, includes a furnace body, a heat medium driving component, a support part, a guide component, and a hollow cylinder. Part of the heat medium is ejected to the outer circumferential surface of the annular component through the guide part, and part of the heat medium flows through the inner channel of the hollow cylinder, and be ejected to the inner circumferential surface of the bearing via the second heat medium channel arranged on the hollow cylinder to heat the inner circumferential surface of the bearing. In this way, the hollow cylinder plays a role of distributing the gas to some extent, and as the upper end of the hollow cylinder is a sealed structure, the flowing gas is all converted into effective heat exchange gas flow and restricted to a heat exchange space on the bearing surface.

The invention relates to a method for heating a furnace, wherein the furnace comprises an inner chamber and a outer chamber. A process gas is introduced into the inner chamber. A fuel is combusted with an oxidant to produce combustion gases in a combustion chamber. The combustion gases are passed through the outer chamber, and recirculated to the combustion chamber. The process gas is pre-heated by indirect heat exchange with the combustion gases.

An austenitic steel sheet excellent in resistance to delayed cracking is provided. The composition of said steel comprises in weight: 0.35%C1.05% 15%Mn26% Si3% Al0.050% S0.030% P0.080% N0.1%, at least one metallic element X chosen among vanadium, titanium, niobium, molybdenum, chromium 0.050%V0.50%, 0.040%Ti0.50% 0.070%Nb0.50% 0.14%Mo2% 0.070%Cr2%. The composition may optionally include B, Ni and/or Cu. The remainder of the composition includes iron and unavoidable impurities inherent to fabrication, including hydrogen. The quantity Xp of the at least one metallic element under the form of carbides, nitrides or carbonitrides is, in weight: 0.030%Vp0.40% 0.030%Tip0.50% 0.040%Nbp0.40% 0.14%Mop0.44% 0.070%Crp0.6%. The hydrogen content Hmax designating the maximal hydrogen content that can be measured from a series of at least five specimens, and the quantity Xp, in weight, is such that: $1000\frac{H_{\max }}{X_P}3.3.$