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.

Maritime Reporter March 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Technology

Schlumberger Announces Q1 Results

Schlumberger Limited (NYSE:SLB) today reported first-quarter 2014 revenue from continuing operations of $11.24 billion versus $11.91 billion in the fourth quarter of 2013, and $10.

RS at SEA JAPAN 2014

Russian Maritime Register of Shipping (RS) was the only Russian company to take part in SEA JAPAN 2014 exhibition and conference – one of the major exhibitions of the maritime industry.

When Will Deep Sea Mining Commence? The Robot is Ready

The world's first deep sea mining robot sits idle on a British factory floor, waiting to claw up high grade copper and gold from the seabed off Papua New Guinea

Finance

India's Reliance Q4 Sales Rise

Indian energy company Reliance Industries Ltd posted nearly flat fourth-quarter profits, in line with estimates, as a slimmer margin in its oilrefining business offset higher revenue.

Schlumberger Announces Q1 Results

Schlumberger Limited (NYSE:SLB) today reported first-quarter 2014 revenue from continuing operations of $11.24 billion versus $11.91 billion in the fourth quarter of 2013, and $10.

New sanctions threats as Ukraine stalemate goes on

A day after an international deal in Geneva to defuse the East-West crisis in Ukraine, pro-Russian separatists vowed not to end their occupation of public buildings

 
 
Maritime Contracts Maritime Standards Naval Architecture Navigation Offshore Oil Pod Propulsion Port Authority Ship Repair Ship Simulators Sonar
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: 0.1297 sec (8 req/sec)