Rectangular Ruukki double grade structural hollow sections
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Founded in 1964, Teräselementti Oy is a Finnish family business specializing in hall construction, building steel frames and façade solutions for commercial buildings. The company supplies its products primarily on a turnkey basis, including product design, manufacture and installation services. The projects are realised either as design-build projects or according to plans supplied by the client. Additionally, some of its façade products are also supplied without the service package. Teräselementti's product development is based on extensive expertise and years of experience.
Customer: Teräselementti Oy
Line of activities: Manufacturing steel structures and their components
Turnover: EUR 17 million (2010)
Employees: 125 (2010)
The project called for a steel grade that would allow constructing a 78-metre column-free area. The steel frame consists of 17 individual 78-metre space trusses with a maximum height of 7 metres and maximum width of 3.5 metres, each weighing between 65 to 80 tonnes. Each truss consisted of two 39-metre segments. Teräselementti Oy, contracted for constructing the frame, used Ruukki double grade S420MH / S355J2H hollow sections as the material for the space trusses of the steel frame. The light high-strength double grade combines the best properties of both S420MH and S355J2H steel grades.
The construction of Exhibition Hall 7's steel frame began in June 2010. The expansion project was successfully completed in August 2011.
Ruukki's double grade structural hollow sections can be used to build structures over 15 percent lighter than ever before. In the convention centre expansion project, the structural properties of the S420 steel allowed for uniform sections to be used even in places that are subject to greater loads. Sections with identical external radii could be used. In addition, approx. 100 tonnes less steel was required than if S355 steel had been used. With S420, only approx. 1,700 tonnes of steel was used for the expansion.
Using double grade steel in steel structures results in substantially lower material costs, providing a financially attractive option. It also lowers the environmental effects caused by material use and production. A use of the double grade hollow sections also decrease storage costs. "Double grade's benefits for the builder were clear during the expansion project: it resulted in a lighter, more economical solution”, commented Markku Laine, who is in charge of Teräselementti Oy's steel construction operation.
Ruukki supplied steel tubes cut to length and directly to the client. "The client could cut down on additional welding costs, as the long tubes were delivered complete from the factory”, Jukka Latvatalo, Ruukki's Sales Representative, reports.
The co-operation between Teräselementti and Ruukki was seamless during the Exhibition & Convention Centre expansion project. Approx. 70 - 75% of the project's material requirements were well known right from the start, which allowed Teräselementti to instantly reserve the required production volume from Ruukki. "The builder made substantial changes to the plans regarding the final phase of the project. Due to these changes, a lot of additional material was required at a moment's notice. Ruukki was able to deliver even these additional material orders within the original schedule", Markku Laine continues.
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