Manufacturing Technology

Chinese Guangdong Guoxin Industrial Co Ltd has awarded SMS Group the final acceptance certificate after the successful commissioning of two single strand wire rod mills for its Jieyang works in Guangdong province.

Designed for an annual capacity of 1.4 million tonnes (700,000 tonnes per wire rod mill), the two single strand high-speed mills roll wire rod in diameters from 5.5mm to 25mm and rebar in diameters between 6mm and 14mm. The originally planned rolling speed of up to 105 metres per second has been exceeded; wire rod sizes have already been rolled at speeds of 120 metres per second. The steel grades to be rolled comprise cold heading, alloyed, spring and stainless steels as well as tyre cord and welding wire.

SMS Group supplied the high-speed area mechanical equipment starting from the four-stand pre-finishing mill, shear system in front of the finishing block, 6+4-stand finishing block arrangement, pinch roll, loop laying head and all related water boxes. Due to the well proven 6+4-stand arrangement, all final dimensions can be finish rolled in a maximum of four passes and thus be rolled thermo-mechanically, i.e. at low temperatures and with close dimensional tolerances.

Besides the mechanical equipment, SMS Group provided the electrical and automation system for the complete line (including motors, drives and sensors), and was responsible for the supervision services for erection and commissioning.