Sweden: Sturdy, lightweight pipe targeted at deepwater drilling risers

Specialstål, based in Lulea and part of the Swedish Steel Group SSAB, has devel-oped an ultra high-strength steel which it believes will have many beneficial applications for the offshore oil industry.

Specialstål, based in Lulea and part of the Swedish Steel Group SSAB, has devel-oped an ultra high-strength steel which it believes will have many beneficial applications for the offshore oil industry.

"There are many products where our steels can be of great use through technical solutions and where low weight and ultra high-strength is used to maximum advantage," says researcher and senior metallurgist Carl-Erik Grip.

One application that has been identified is for deepwater drilling rising systems. With long pipes of up to 1,500 m, conventional material produces very heavy pipe. Specialistal's ultra high-strength steel, combined with composite, has produced a strong, lightweight pipe which is also resistant to high pressures.

The company's high-strength steels with yield strength from 950-1,350 Nm/mm2 are already being used for containers where high strength and low weight are a priority. Tare weights can be reduced by around 25-40%, giving increased payload without compromising the integral strength. These weights were previously only achievable using aluminum.

For more information contact Per Hedberg, SSAB Specialstol. Tel: +46 920 92771, Fax: +46 920 255856, Email: per.hedberg@ssab.com.

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