Polyolefin coated steel pipes
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United States of America Patent
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Apr 9, 2013
Grant Date -
Feb 3, 2005
app pub date -
May 21, 2002
filing date -
May 21, 2001
priority date (Note) -
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Abstract
Polyolefin coated steel pipes with high dynamic fracture toughness of the coating of the steel pipes during installation handling and in service, consisting of a steel pipe core, optionally an intermediate foamed plastic material, and a polyolefin coating of β-nucleated propylene copolymers whereby a test polyolefin pipe fabricated from the β-nucleated propylene copolymer has a critical pressure of >25 bars and a dynamic fracture toughness >3.5 MNm−3/2. The polyolefin coated steel pipes are suitable for off-shore transport of crude oil or gas products or district heating applications.
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