Equipment Manufacturing: Yongyang Special Steel’s medium and flat bar rolling line is hot commissioned

New line features CISDI’s world-class core equipment - BDCD breakdown mill, NHCD short-stress path rolling mill and BRSM bar reducing and sizing mill

Yongyang Special Steel’s new medium and flat bar rolling line has been successfully hot-commissioned in just one pass.

CISDI supplied the main rolling line’s equipment, which enabled all hot-tested product dimensions to meet standards. 

Yongyang is based in China’s Hebei Province and the line is critical to the company’s pledge to return a reclaimed urban area and upgrade its facilities.

CISDI has a strong relationship with Yongyang, having previously supplied a light rail rolling line to the plant in 2020 and a heavy rail rolling line in 2021.  

Specifics of the CISDI green, intelligent manufacturing tech and equipment in the 2023 line’s breakdown and continuous rolling procedures:

²  BDCD breakdown mill, featuring 2-roll heavy-duty equipment, enables single-pass, large-reduction rolling, makes a deeper deformation of the bar and increases blooming efficiency and bar’s internal quality

²  NHCD and BRSM’s super-stable rigidity ensures bar process and end dimensions meet precision requirements 

²  Multi-stage high-pressure water descaling units at the line’s five user points enhance bar surface quality 

²  Dual-route roller tables from the finishing mill to the cooling bed’s inlet facilitate the separate passage of round and flat bars, which prevents bars from being scratched 

²  Accurate, full-process bar temperature pre-setting and control functions from bar reheating to discharge and a lifting and open/close thermal holding cover and a fast car at the cooling bed area achieve the appropriate cooling systems for all products 

²  A combined online and offline finishing system improves bar quality.

The line will produce 600,000 tonnes of main products a year - 36-130mm diameter special steel bars, spring bars with a thickness range of 8-35mm and width range of 50-160mm, and fork flats 25-100mm in thickness and 75-200mm in width. 

These products will feature grades of alloy structural, quality carbon structural, pinion, bearing, spring, cold heading and cold extrusion, unquenched, machinery and fork steels.

The major mill trains and units are pictured operating at Yongyang Special Steel’s medium and flat bar rolling line:

The BDCD breakdown mill

The NHCD short-stress path rolling mill

The bar grouping area