5SP steel billets are used to produce rebar. The billets are usually 120×120, 125×125, 140×140 or 150×150. Purchased billets will be discharged, stored and permitted to charge into the furnace in the event that they will be confirmed by quality control unit regarding its chemical compound. Charging operation will be performed by automatic charging table and pusher furnace system.
After charging billets into the furnace, heating process will be done by bual fuel burner so that currently burners are producing energy by gas.
Heating operation is under controlled by furnace automation and control system. Furnace temprature rises up to 1250 ˚c then the billets come out by furnace poker system and direct to roughing rollers by decharging table.
Depending on the size of consummated billets, this stage of rolling operation will be performed in three or five steps and materials will be directed to middle stands based on their dimension. Then rolling operation will be continued and materials’ cross section will be lower and finally the last steps of rolling operation will be performed in final stands.
It is noteworthy that, in order to reach desirable tonnage and speed in rolling process in the last stand, numbers of 18, 20, 22, 25, 28, and 32 will be produced as single rebars, numbers of 12, 4, and 16 will be produced as double rebars and finally numbers of 8 and 10 will be produced as quadrupel ones.
At the end of rolling process, in order to attain mechanical specifications based on ribbed rebar number 420 (A3), rebars passes through a device called ترمکس and reaches to the expected mechanical specifications.
Produced rebars are controlled by quality control unit regularly and in case of approaching to the warning level corrective procedures will be performed by production unit.
The length of primitive cut in cutting machine is 36m, then cooling bed cooled rebars are cut to 12m by guillotine shear. After 12m cutting and final confimation by quality control unit, bundles will be packaged up to 2tons and specification labels will be posted on each including the information of size, bundle number, production date, billet code, etc. afterwards produced bundles be transported to store and stockpiled in different areas by overhead crane and at the end will be delivered to buyer’s address.