G-Steel - Company Case Study

Topics: Furnace, Steel, Steelmaking Pages: 10 (2223 words) Published: May 28, 2010

G-STEEL Public Company Limited was founded by Dr. Somsak Leeswadtrkul, and is considered a leader and a pioneer of the Thai and Southeast Asian steel industry with more than 40 years of experience in hot rolled coils manufacturing. The plant is located in Rayong, which is about 175 kilometers from Bangkok, Thailand. The grand opening of G -Steel was on 30 March 2000 with the support from the SSP Group and large end-users of hot rolled coils. The total investment to establish the company was US$1 billion. The plant obtained promotional privilege from Thailand’ Board of Investment in 1996. s G-STEEL‘ plant is equipped with advanced and integrated technology at its liquid steel makin g, s slab casting and hot rolling processes. This multi-phased steel plant operates at full production capacity of approximately 1.8 million tons of hot rolled coils (HRC) per year, meeting product quality specifications of domestic and international markets.

G-STEEL’ plant is amongst the most advanced steel plants worldwide. The plant’ “ s s Compact” or “ Mini mill”layout comprises of three basic integrated production processes: § Steel Making: The first step is to melt a variety of metal scrap and other bearing materials, such as pig iron, with additives to produce clean steel. This process is carried out in two Electric Arc Furnaces (EAF) supplied by Mannesman Demag Huttentechnik, Germany and equipped with oxygen fuel burners, carbon injection system, and other equipments. The steel is further chemically refined to meet customer requirements in two Ladle Heating Furnaces (LHF). Continuous Casting: In the second step, the clean, refined and graded steel in liquid form is fed into a medium thickness continuous slab caster. The slab casting technology was supplied by Sumitomo Heavy Industries, Japan, and is in terms of quality and production cost superior to thin slab casters. The caster has the state-of-the-art features: liquid core reduction, start-stop sequence, mould level control, and break out prediction module . This allows G-STEEL to simplify the operator tasks of this complex process. Hot Rolling Mill: In the last step of the production process, the slab from caster is fed through a tunnel furnace, which maintains the slabs at required rolling temperature, to a continuous rolling mill. Mitsubishi, the world leader of heavy industries companies, supplied the mill. It consists of two roughing stands, mandrels, a coil box, and six finishing stands. The coil box installed between roughing and finishing mill optimizes the scrap requirement and improves the transfer temperature thereby reducing the power requirements. Other features include crown and shape control technologies, latest gauges and on roll grinding.




Energy Efficiency Guide for Industry in Asia–www.energyefficiencyasia.org

Figure 1: Hot Rolled Coils production process

G-Steel is committed to quality and environmental control: § Quality Control: G-STEEL’ objective is to consistently provide high quality products to s meet customers’expectations as well as the industry’ own stringent standards. This s commitment is reflected by its ISO 9001:2000 accreditation, which in combination with world-class production technology ensures that customers get products of a reliable quality. ISO certification is also a major step towards fulfilling G-STEEL’ vision which is to s • Contribute to Thailand’ future industrial growth through continuous ly adopting more s environmentally friendly technology and professional management • Produce a wide range of steel products at competitive prices, thus reducing the need for Thai customers to buy products in foreign currencies, and earning foreign currency for Thailand through export of its products. § Environmental Control: G-STEEL recognizes that industrial development will adversely affect the...
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