From the automatic tuning technology of DM4 system, a major conclusion is that self-tuning database technology should be based on the paradigm of a feedback control loop.

For the furnace designing, the construction of walking beam, beam aligning device, self accorded slag removing facility, automatic billet alignment and hydraulic system are discussed.

It is pointed out that this system has the function of self diagnosis, the system fault automatic isolation function, the anti lightning and overvoltage protection function.