A Bundle of Advanced Technology

Wednesday, February 13, 2002
The close cooperation of the Finnish Maritime industry is evidenced in the highly capable icebreaking ships that it produces. Icebreakers are essential to Finland’s existence, as the specialized ships enable the country to keep its shipping lanes operational during the harshest winter months. However, traditional icebreaker design made for poor navigating vessels in open water, and thus were rendered useful during only the winter months. This was acceptable, but very expensive, as icebreakers by nature represent a significant maintenance challenge and cost. The solution: creating a new design icebreaker that could be used, profitably, year-round. This was don by the Finnish board of Navigation, which has built at Finnyards and operated a trio of vessels that break ice in the winter, and work as supply ships in te North Sea oilfields during the summer. Bringing these two combinations of capabilities in a single vessel means advnanced hull design. To be able to carry more load, the hull had to be constructed using 500 Mpa yield strength TMCP steel with excellent impact strength properties, supplied by Rautaruukki. The hull plating of icebreakers and other ice-going vessels is subjected to ice erosion that can remove protective paint coatings and leave the hull exposed to seawater. Under such extreme circumstances, preferential corrosion can develop in the vicinity of welded joints, e.g. the weld metal, the heat affected zone (HAZ) or fusion line (FL). The location and extent of preferential corrosion depends on the compositions of the weld metal and base plate and the heat input used in welding.

Accelerated weld metal corrosion can be prevented using a sufficient filler metal. HAZ and FL corrosion can be a problem when high strength shipbuilding steels are used, especially for low heat input welds. Rautaruukki Steels of Finland, in cooperation with shipyards, has developed a range of RAEX POLAR steels for structures having stringent requirements on the seawater corrosion resistance of welded joints. The Finnish marine cluster is particularly renowned worldwide for its advanced products and systems born of necessity to keep its vital shipping lanes open during the harshest winter conditions. Moreover, the country’s industry traditionally works in tandem to co-develop and bring to fruition the systems, a technique that ensures that the solutions are the culmination of real working conditions. The RAEX POLAR series of steels have been specifically developed to avoid HAZ and FL corrosion problems. The chemical composition of the steels is balanced to provide an optimum combination of corrosion resistance, strength, toughness and weldability. The corrosion resistance of all of the RAEX POLAR line is verified in specially designed corrosion tests, which lasted six months, under the auspices of the classification societies.


Technology

MN100: MarineCFO

The Company: Founded in 1992, UA Business Solutions was a pioneer in the field of Enterprise Resource Planning (ERP) and an early Microsoft Partner. The ERP evolution

Better Turbocharger Performance, Proven Tech

Engineer wisdom: Nothing is worse as the right idea at the wrong time. But with the new ECOCHARGE Two-Stage Turbocharging System MAN D&T has reached both goals.

Rotor Sail Development Gets a €2.6 Mln Boost

Norsepower Oy Ltd., the leading provider of low maintenance, software operated, and data verified auxiliary wind propulsion systems, has been selected to receive €2.

Finance

Canada May Ask Far-offshore Drillers to Pay Extra

Canada may ask oil companies to contribute to the hundreds of millions of dollars or more the country has to pay to an international body if they drill far offshore,

European Owners Lead in Buying Up Secondhand Tonnage

With European owners leading the pack in buying up vessels, the sale and purchase market appears to have been notably active in recent years, reveals Clarkson Research Services Limited.

Monjasa Bags Credit Facility from Société Générale

Danish bunker fuel supplier and shipping firm Monjasa has signed a credit facility with French bank Société Générale for USD 80 million.    A statement from

 
 
Maritime Careers / Shipboard Positions Maritime Standards Navigation Pod Propulsion Salvage Ship Electronics Ship Simulators Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.0822 sec (12 req/sec)