STEEL-WIRE- Short cycle annealing furnaces for steel wire, coil and bar

Protective atmosphere roller type short cycle annealing furnace for steel wire

The protective atmosphere roller type short cycle annealing furnace, referred to as STC furnace, is mainly used for the bright annealing heat treatment of products such as bars, wires, copper pipes, etc., to improve the uniformity of the structure and enhance the mechanical processing ability. High quality products such as high-grade, high-strength standard parts, automotive cold formed parts, and bearing steel often require annealing of wire (steel wire) during the refining process before production to reduce tool wear, improve product yield, and facilitate cold heading forming, to reduce hardness, improve structure, and obtain good mechanical properties. The STC furnace is an essential equipment for completing this process.

Gas fired RX gas protection roller type short cycle annealing furnace is a typical STC furnace. This STC furnace prepares an endothermic reaction atmosphere by cracking natural gas for use as a protective gas in the furnace for heat treatment, which can effectively limit the generation of additional decarbonization. An endothermic gas generator is a device that mixes natural gas with a corresponding amount of air, and under the action of high temperature and catalyst, undergoes incomplete combustion to produce a special atmosphere, commonly known as RX gas. The formula for preparing an endothermic atmosphere using natural gas is: CH4+2.38 air ->CO+2H2+1.88N2. The composition of RX gas from natural gas as cracking gas is about 20% CO and about 40% H2.

The atmosphere inside the STC furnace is a mixture of CO, N2, H2, and CO2. In order to control the atmosphere in the furnace and maintain the pressure inside, the working space of the furnace must always be isolated from the outside air to avoid air leakage and intake. For maintaining a certain carbon potential in the furnace, besides controlling the stability of the atmosphere composition, it is also necessary to control the atmosphere in the furnace automatically according to different processes. Therefore, various monitoring instruments and devices are essential, such as CO and CO2 analyzers, O2 analyzers, etc., to continuously measure or regularly measure the atmosphere in the furnace to adjust the gas supply.

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