·The U-turn double deck roller-hearth continual spheroidal annealing furnace is a special design of roller-hearth furnace. The overall shape of the furnace is a U-shape. It has its feed end and delivery end at the same side of the furnace, with the delivery end right below the feed end. The upper layer consists of the feed end, the heating zone and the heat preservation zone while the lower layer consists of the isothermal zone and the cooling zone. The two layers are isolated by furnace lining and connected via an isothermal elevator and together they perform the isothermal annealing process. There is a heat exchanging chamber at the end where the feed end and delivery end are. The heat exchanging chamber is able to save a great amount of energy; when batches of bearing ferrule is annealed, the power consumption dropped to 170-185kw..h/ton.

·The annealed workpieces have great internal structures under microscope, the structural difference between workpieces is very small, and the deviation in hardness is very small as well. The technologies and the quality of annealing have reached leading position world widely.

·This series of furnaces have largely adopted advanced optical-mechanical-electrical integrated technologies. The material feeding and unloading are the only processes requiring manual work; all the control of temperature, electricity, program and atmosphere are performed by computer, which has greatly reduced the chance of malfunction, difficulty of operation and workload, and stabilized the annealing process.

·The company possesses the entire intellectual property of these furnaces. These furnace are able to adopt the patent "vacuum chamber soft-sealing device" (Patent number ZL200620103452) invented by our company, to transform into the pre-vacuumized nitrogenous controlled-atmosphere continual annealing furnace. This furnace is able to perform non-oxidized anti-decarburizing annealing, during which the decarburized layer is no deeper than 0.05mm, which give decent surface quality and saves energy and material.