LONG PRODUCTS BULLETIN - SMS Meer GmbH

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World record 40 Newsletter No. 3/2009 Long-product mills Unique rolling mill for 700,000 tpy of rebars Stefana, Italy: World record for rolling of straight bars The bar mill of Stefana S.p.A., Italy, built by SMS Meer came on stream in mid-2008 and is unique in view of productivity and product quality. The mill reaches full capacity at all dimensions of the product mix. Now, the production line at Ospitaletto in northern Italy has set a new world record on July 2009 for the rolling of straight bars on the cooling bed: the new mill produced salable coils made of rebars at a diameter of 8 mm and an average real speed of 40 m/s over several hours during shift operation. This performance is equivalent to a production of single bars at double speed, i.e. as if 80 m/s would have been achieved. A target limit value which had formerly only been planned has now actually been reached and further improvements can soon be expected. At a production of 8-mm rebars with slitting and the two-strand HSD ® system and at a rolling speed of 40 m/s billets are required to such an extent that the maximum furnace capacity of 106 t/h is almost reached. VCC station. Coil bundling and tying system. Two-strand HSD ® system for supreme performances. The facilities for a high performance of this future-oriented mill are mainly two slitting lines in combination with a two-strand HSD ® system as well as the control system with software developed by SMS Meer. The basic principle of a two-strand HSD ® system is to finish-roll bars in two six-stand and V-shaped finishing blocks and to cut them with two state-of-the-art high-speed disc type dividing shears. Then, the bars are processed over their entire length in four braking pinch-roll units (two for each strand) and two dual-rotating channels installed on top of the entry table of the cooling bed. Only one bar per tooth is deposited on the cooling-bed rakes to make sure that a clean layer is available for the bundling and tying systems. Largest furnace of its class. Other mill components worth mentioning are a walking-hearth furnace for the heating of 16-m-long square billets at a cross-section of 160 mm x 160 mm, which is one of the largest of its class, as well as two of our patented VCC (Vertical Compact Coiler) facilities.
Yield improved by 30 %. A benefit of the unusual furnace length is a yield improved by 30 % compared to furnaces for 12-m billets. Compact coils can additionally be produced with weights up to 3.2 t. This coil size is advantageous for downstream transport, storage, further handling and other tasks. Production mode selectable: only straight bars or only compact coils or both mixed. Alternatively to a restriction of straight bars produced without exception via the HSD ® system or to compact coils produced only via the VCC station, a mixed production mode can also be selected. In this case, the strand is delivered from a finishing block onto the cooling bed while the VCC system is charged at the same time by the second finishing block. Improved yield and higher productivity. Needless to say, that the new production concept at Stefana reduces the number of short bars and the accumulated scrap which on the other hand results in a reduction of the production costs. Therefore, the new bar rolling mill at Stefana S.p.A. achieves an improved production yield and higher productivity. The results also show that excellent economic results can be attained by competent and detailed advice. Finish-tied coil. VCC coiler – Vertical Compact Coiler from SMS Meer VCC facilities from SMS Meer – shown on the photo below – with outstanding technology are used for the production of steel bars. The system was developed by SMS Meer. In August 2009, the Court of Appeals in Trieste, Italy, rejected all contestations of our competitors pending further notice (N295/09 Sent). Newsletter No. 3/2009 41
Page 1 and 2: LONG PRODUCTS BULLETIN Special Edit
Page 3 and 4: The new wire rod mill has been desi
Page 5 and 6: Commissioning Stahlwerk Annahütte
Page 7 and 8: The core element of a modern heavy-
Page 9 and 10: Celsa’s section mill: preventing
Page 11 and 12: Good for the environment and for re
Page 13 and 14: Five-strand billet caster The casti
Page 15 and 16: The here realized beam blank castin
Page 17 and 18: Piya Chairat, Plant Manager of Siam
Page 19 and 20: The minimill for medium sections of
Page 21 and 22: Service SMS Meer (UK) Ltd.: Service
Page 23 and 24: Commissioning SMS Meer has moderniz
Page 25 and 26: Commissioning Long-product Mills Ab
Page 27 and 28: New order About 1 million t of stee
Page 29 and 30: The new pre-assembly bay. Component
Page 31 and 32: The CRS® roller straightener. To m
Page 33 and 34: The new metallurgical complex will
Page 35 and 36: Furnace and rolling mill Reheat fur
Page 37 and 38: Magnetic stacker. Saw in operation.
Page 39: For this modernization the continuo
Page 43 and 44: Temperature progression for wire ro
Page 45 and 46: Automatic gage control and monitor
Page 47 and 48: The wire outlet starts with a cropp
Page 49 and 50: Annual capacity: 690,000 t of wire
Page 51 and 52: New order Capacity: 1 million t of
Page 53 and 54: Finishing area with 90-m cooling be
Page 55 and 56: Revamp with just minor production l
Page 57 and 58: Higher yield and closer length tole
Page 59 and 60: Universal rolling in the compact st

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