Processing spring wire is a challenge: on one side the surface of the processed wires must be fully under control while in the meantime the metallurgical structure of the wires has to match with the most stringent mechanical conditions. FIB has a long successful experience in the supply of oil tempered lines but also with upstream open fire patenting lines.

Unshaved wires handled in the FIB open fire furnace IMFLEX have been successfully processed without traces of decarburization.

Regarding the oil tempering process, indirect heating is used.