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Kocks to Supply Reducing & Sizing Block for Dongbei Mill Upgrade

03/06/2008 - Kocks will supply a 3-roll Reducing & Sizing Block as part of the conversion of Dongbei Iron and Steel’s wire rod and bar mill into a pure bar mill.

Dongbei Special Steel Group, P.R. China, has placed an order with consortium partners Danieli & C., Italy, and Friedrich Kocks GmbH & Co. KG, Germany, to modernize the Dalian Iron & Steel continuous wire rod and bar mill.
 
Dongbei, headquartered in Dalian, is one of the top three specialty steel producers in China. The company was formed in September 2004 by a merger of Dalian Iron & Steel, Fushun Special Steel, and Beiman Special Steel.
 
The upgrade is being conducted as part of an environmental works relocation for the facility, which was originally installed in the mid-1990s. Part of the project centers on conversion of the existing combined 300,000 tonne/year wire rod and bar mill into a pure bar mill. Kocks will supply a 3-roll Reducing & Sizing Block [RSB] including accessory equipment. Operating as a finishing block behind stand No. 18, the new 4-stand 370-mm RSB will produce all finished dimensions within the range of 13- to 60-mm diameter. In the future, the line can be extended for the production of bar in coils with diameters from 13 to 50 mm.
 
The Reducing & Sizing Block significantly reduces the required number of pre-sections required in the upstream mill, thus allowing simplified operation of the complete mill using a one-pass family. The block and its respective pass design provide the prerequisite for thermo-mechanical rolling, which is state-of-the-art for modern bar mills.
 
An extended “free-size” range of up to ± 1.5 mm from the nominal size allows rolling of a variety of sizes with tight tolerances with only remote-control adjustments to the stands and guides. The adjustment is done automatically during a billet gap within a maximum of one minute. Whenever the finished dimensions exceed the “free-size” range, the quick stand-changing system allows stands to be changed in less than five minutes. The mill is designed to have the flexibility to roll a wide range of sizes with a minimum number of roll sets and stand changes.
 
Start-up of the modernized bar mill, including the new Kocks 3-roll Reducing & Sizing Block, is scheduled for mid-2009.