High-temperature fiber ball closing device and oxygen-free annealing process thereof

Abstract

The invention discloses a high-temperature fiber ball closing device and an oxygen-free annealing process thereof. The high-temperature fiber ball closing device is characterized by comprising a nettycontainer, a hinge, a locking rod, a locking bottom plate, a locking plate, a lockpin and aluminium silicate fiber, wherein the netty container is of a flat ball netty structure and is made of heat-resistant steel metal wires; the locking bottom plate is connected with the bottom perpendicular to a flat plane direction; the top is connected with the locking plate; the locking rod is fixed in thecenter of the locking bottom plate; the locking rod penetrates through the netty container along the center line of the flat plane and penetrates out of a central square hole of the locking plate; locking straight teeth press the upper edge of the square hole of the locking plate; the netty container is filled with the aluminium silicate fiber; and ceramic layers are welded on the outer surfaces of the netty container, the hinge, the locking rod, the locking bottom plate, the locking plate and the lockpin through spraying. The oxygen-free annealing process comprises the following steps: a finecapillary tube is arranged in a coarse capillary tube and is shorter than the coarse capillary tube; one end of the coarse capillary tube is put in the high-temperature fiber ball closing device andis locked by the locking rod; after carrying out nitrogen purging on the interior of the coarse capillary tube, carbon powder and cast-iron scrap are put in the coarse capillary tube, the other end ofthe coarse capillary tube is locked by the high-temperature fiber ball closing device, and the coarse capillary tube is fed in a heat storage type annealing furnace for annealing.

Description

technical field [0001] The invention relates to the fields of heat treatment and environmental protection, in particular to a high-temperature fiber ball sealing device and an oxygen-free annealing process thereof. Background technique [0002] my country has now become the largest country in the production of bearing steel, and its heat treatment process requires spheroidizing annealing before quenching. host. Due to the presence of oxygen in the heating furnace to form an oxidizing atmosphere, a chemical reaction will occur on the metal surface to form oxide scales and cause decarburization (although the regenerative heating furnace has a low oxygen content, it also occurs), and the decarburization of bearing steel must be produced by turning. It affects the finished product rate and production cost. On the other hand, the bearing steel cold-drawn material is decarburized, and the user's re-inspection pass rate is low; the scale must be removed by pickling, which pollutes ...

AI Technical Summary

Problems solved by technology

Due to the presence of oxygen in the heating furnace to form an oxidizing atmosphere, a chemical reaction will occur on the metal surface to form oxide scales and cause decarburization (although the regenerative heating furnace has a low oxygen content, it also occurs), and the decarburization of bearing steel must be produced by turning. It affects the finished product rate and production cost. On the other hand, the bearing steel cold-drawn material is decarburized, and the user's re-inspection pass rate is low; the oxide scale must be removed by pickling, which pollutes the environment

Existing technological methods to avoid the above-mentioned unfavorable phenomena: one is to rush into a protective atmosphere such as nitrogen, and heat it with electricity, which is very expensive and requires a large investment in equipment; the other is to coat the surface with a layer of refractory coating, which is easy to crack during heating Or fall off, the protection is not ideal, the process is complicated, and the cost is relatively high; the third is to use the regenerative burner for low-oxygen combustion, which still makes the surface of the capillary form a very thin oxide film, which is difficult to remove even if it is pickled

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