IDC, Interstand Dimension Control, Field experience at Shiu Wing Steel Hong Kong

by Mats G Olsson

Publisher - ABB AB

Category - General Novel

Field experience is proving not only improved yield and product tolerances but also increased mill productivity. In a typical mill, the tolerances can be halved with IDC implemented compared to the normal performance. In 2005 a MFC, mass flow control, was installed at ShiuWing Steel Limited, Hong Kong. “The ABB, MFC and UGauge configuration is helping us to increase our yield and to reduce the rolling tolerances, when rolling single as well as welded billets. The system is also giving valuable online information to our operators”, says Erik Raftsjö, ShiuWing Steel. The MFC control improves the tolerances from head to tail of rolled material, tighter tolerances results in more consistent bundle weights. At ShiuWing Steel Limited, Hong Kong, achieved bundle weight tolerance in %, for 500 bundles of 40mm rebar, bundle weight 2000Kg. With MFC: µ= - 2,99 σ= 0,16 Without MFC: µ= - 3,32 σ= 0,38 Each bundle consisted of the same number of reinforcing bars. At Fundia Boxholm, Sweden final rounds in the range of 60 -70 mm have been rolled to a 1/8 DIN (1/4 ASTM) tolerance via two or three IDC controls in a 4-6 H/V mill stand configuration. The same tolerances are achieved for 20 mm rounds rolled with three IDC controls. Our SEAISI 2009 paper will give an overview to the IDC concept as well as results and experience from rolling mill installations.

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