Cogging mill

Equipment: short stress big bar rolling mill


This big alloy steel big bar mill was put into production in October, 2014. Its product focuses on offering middle sized high-end special steels for automobile, engineering machinery, petroleum pipeline, and drill collar, shipbuilding and etc. Main product size between diameter 80mm to 350mm, and material covers gearing steel, bearing steel, spring steel, alloy steel, free cutting non-quenching steel, low alloy high strength steel, anchor chain and mooring cable steel, carbon steel and etc. Annual production in design is 400,000tons.

Shigang Jingcheng rolling mill project, as the key planning project of Liaoning Province during the “Twelve Five Planning”, has 3 leading echnology advantages as following:

1. The max diameter of mill feeding material is 1100mm. Big size feeding material sharply promotes the material compression ratio.
φ 1350 billet opener has a larger reduction in a single pass, up to 90mm. The greater rolling reduction brings the pressure transformation till to the bar’s center area, leading to better grain size and microstructure. 
2. The digital heating furnace applies French Fives Stein’s latest patented technology. The unique burners bring great contribution for more uniform organization of the heated billets and product performance more stable.

3. Electrical system is supplied by Siemens (China Engineering Company), including process automation and management automation. Cogging mill main motor was imported from Germany, medium voltage AC - DC - AC converter SM150. S120 frequency converter is used for low voltage drive. Automation and drive device connect through PROFIBUS. The whole line electrical system is AC driving.