plant information

Semi-finished products Square billets: 130, 160, 200 mmProducts Rebar: 9.5 to 43 mm in bar and compact coilMelt shop capacity 1,200,000 t/yRolling capacity 800,000 t/yKey features Continous casting using Invex® technology

Direct hot-charge operation at the rolling mill

HSD® High Speed Delivery system

VCC® Vertical Compact Coiler

project information

Customer Tung Ho Steel Enterprise CorporationLocation Taoyuan, TaiwanCommissioning September 2010Scope of supply Complete technological production line

tung ho steel Minimill with groundbreaking power efficiency

tung ho steel Full integration: reducing costs and emissions

Economical, efficient and environmentally sound – these are the 3 E’s of the SMS Minimill for Tung Ho Steel. The Minimill is a best practice example for groundbreaking power efficiency. It minimizes energy consumption by directly linking the melt shop with the mill – through a temperature equalization induction heater. The results: sav-ings of 72,000 t/y of CO2, 410 t/y of SO2 and 225 t/y of NOX emissions. Investment costs are about 30% lower compared to conventional furnace concepts while operating costs decrease by 25 USD/t of concrete steel.

melting. The 120-MVA electric arc furnace (EAF) uses state-of-the-art CONSO oxygen technology to reduce electrical energy consumption and simultaneously increase productivity.

refining. After tapping, the ladles are transferred to the ladle furnace for steel refining and trimmed to final chemical composition. The double-bay plant layout allows for maximum operational flexibility, including the future production of spe-cial bar quality (SBQ) steel grades.

highlights of the tung ho plant

Steel plant

Rolling mill

melting refining casting

1 Scrap yard

2 Electric arc furnace: 120 t, 6.2 m diameter, 120-MVA transformer, CONSO O2 technology, 167 t/h production rate, 43 minutes tap-to-tap time

3 Ladle furnaces: 20-MVA transformer

4 Fume dedusting plant

5 Continuous caster: 5 strands (6 future), 10.25 m radius, Invex® technology, 40-45 t/h per strand

6 Induction equalization furnace

7 Continuous rolling mill stands in horizontal/ vertical and convertible configuration

8 High-speed finishing block 6 passes (provision for installation of a second finishing block in future)

9 Straight bar cooling bed with HSD® High Speed Delivery system (up to 45 m/s)

10 Finishing facilities for straight bar

11 Coiled bar production line with VCC® Vertical Compact Coiler (up to 35 m/s)

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casting. The 5-strand continuous caster is equipped with Invex® technology and a hydraulic oscillator in compact arrangement. This makes the high casting speed process pos-sible and reliable. Simultaneous casting of different formats is also possible.

reheating. Billets are delivered to the mill in an optimal temperature range – there is no reheating necessary. But the billets still need temperature equalization since the surface is colder than the core. The installed induction furnace perfectly equalizes the billet temperature, both in cross section and lengthwise.

rolling. The mill includes 14 stands in horizontal, vertical and convertible configuration for hot rolling. The capability of maintaining very close tolerances in this single strand rolling line results into a considerable yield increase compared to the traditional lower speed slit rolling. Smaller diameters are finished in a 6-stand finishing block stand for high-speed roll-ing of bars.

finishing. The straight bar process line is equipped with the industry leading High Speed Delivery (HSD®) system for safe and reliable delivery of bars up to 45 m/s on the cooling bed. Rebar can also be produced in compact coil thanks to a Vertical Compact Coiler (VCC®) line.

reheating rolling finishing

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The new plant optimally implements the basic minimill concept: short ways and a direct linkage of the rolling mill to the steel plant. The hot billets running out of the continuous caster (with a capacity of 40 to 45 t/h per strand) are im-mediately brought to a uniform temperature in the inductive heating plant. Then, the billets run directly into the rebar rolling mill. In this way, a gas- or oil-fired reheating furnace upstream of the rolling mill could be dispensed with. Under certain conditions, even an inductive heating is not required since the billets are shaped in such a way that they hardly lose any heat during the subsequent production process.

WorldWide leading plant manu-

facturer With references in the

Whole World

This mill shows yet again that SMS customers benefit from integrated all-inclusive solutions of the SMS group. Two plant manufacturers which are leaders in their respective fields, SMS Concast and SMS Meer, join together their innovative concepts within a seamless process chain. In doing so, they spare business partners from time-consuming and costly interface problems – and thus allow the mill to be put into operation ahead of schedule.

the minimill concept All-inclusive solution of the SMS group

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the minimill concept All-inclusive solution of the SMS group

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Tung Ho – ChinaMinimill designed by

SMS Concast and SMS Meer

For the generation of energy, Taiwan depends almost 100 percent on oil and gas imported from abroad. The coun-try generates high emissions of greenhouse gases, and as a result of this, the government is making efforts to reduce energy consumption and the emission rate. In response to these efforts, the Minimill-Team has materialized an innova-tive approach for the new minimill of Tung Ho in order to reach minimum energy consumption.

reduced operational costs

Eyery year the steel plant with electric arc furnace, ladle

furnace and a five-strand billet caster from SMS Concast is producing 1.2 million t of billets and the rebar mill from SMS Meer has a capacity of 800,000 tpy. Due to the innovative energy concept, every year Tung Ho Steel reduces the emission rate of carbon dioxide (CO2) by 72,000 t, of sulfur dioxide (SO2) by 410 t and of nitrogen (Nox) by 225 t. In addition to this, the investment costs for the inductive heating plant are approx. 25 to 30 % less than with conventional furnace concepts. At the same time, the operational costs for each t of rebars are reduced.

minimills set neW standards Less energy and more environmentally friendly

Economic benefit

Reduced costs: 11 €/t

Ecological benefit

Reduced carbon footprint: 72,000 t CO2 p.a.

410 t SO2 p.a.

225 t NOx p.a.

ecoplants

ecoplants

“We were able to up production, cut costs thanks to energy-efficient process-es and do something for the environment at the same time. So we not only save on emissions, but also hard cash”.

Tim Hsu, Tung Ho Steel

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minimills set neW standards Less energy and more environmentally friendly

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Are you interested in more detailed information on this project or SMS Minimill technology in general? Please do not hesitate to contact our SMS Minimill Team, they will be more than happy to answer your questions:

sms minimill team

SMS Meer S.p.A.

Via Udine, 103

33017 Tarcento (Udine)

Italy

Phone: +39 0432 799-111

Fax: +39 0432 784-556

sales@sms-meer.it

www.sms-meer.it I400

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