Open fire furnace / Annealing Pickling from JJRS

Continuous annealing
Annealing is a process in which metals, glass and other materials are treated to render them less brittle and more workable. Continuous steel annealing subjects rolled strip product to a sequence of furnaces to elevate and profile the strip temperature according to grade and dimension. The end result is an increased ductility and removal of strains that lead to failures in service. Because the overall length of strip in the furnace system is a few kilometers long, the furnaces are vertical, with the strip making several traverses within each furnace.

Continuous annealing lines have the following features:

Accumulators
Variety of furnaces
Atmosphere control
Line stop

Furnaces are necessary to give steel the desired properties by heating to particular temperatures and profiles thereby determining the grain structure within the metal, and to prepare for further processing such as galvanizing.

In the heating furnace, the cold strip is heated to the highest temperature of the annealing profile. Because of the danger of oxygen contamination and flame length hotspots, the heat is radiated to the strip using ceramic radiant tubes, themselves fired by gas.

The soaking furnace is required to maintain strip temperature and is electrically heated.

Continuous Annealing Furnace Features

• Applicable to large volume production of single variety
• Short annealing period and high productive efficiency
• Good temperature uniformity and good surface quality of finished product
• Complicated technology with large one-time investment
• JJRS self-developed " JJRS-Sendzimir" technology with lots of technical patents
• Energy cyclic utilization saves running cost and decreases annealing cost
• Fuels applicable for wide us: Natural gas, cooled coal gas, blast-furnace gas, coke oven gas, etc.
• Advanced furnace structure, perfect heat preservation, even and stable temperature control
• Higher-level automation could realize automatic control, automatic detection, safety protetion, automatic report and long-range control etc.

Part section of the equipment list

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