High-strength tube resists corrosion
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Sandvik Materials Technology UK product story
Edited by the Engineeringtalk editorial team
Apr 30, 2008
Sandvik SAF 3207 HD has been developed to meet demands for more remote and deeper subsea umbilicals, which link remote subsea wellheads to the processing platforms.
A major technological development sees the introduction of a new hyper-duplex stainless tube material by Sandvik, which provides the ultra-high strength and corrosion resistance needed for the wellhead control systems for today's enhanced oil and gas recovery methods.
Sandvik SAF 3207 HD has been developed to meet demands for more remote and deeper subsea umbilicals, the electrical and hydraulic system 'lifelines' which link remote subsea wellheads to the processing platforms.
Its higher yield strength withstands increased pressures, enables thinner wall umbilicals, reducing reel sizes and lowering installation costs.
The ability to withstand crevice corrosion at seawater temperature makes the new special-purpose material ideal for very deep umbilical applications in extreme conditions.
Optimising material strength and corrosion resistance, hyper-duplex Sandvik SAF 3207 HD extends the properties of Sandvik's industry standard super-duplex grade, Sandvik SAF 2507.
Use of the new grade makes it possible to develop installations and explore new fields that were previously thought to be too expensive and technologically unattainable.
The material is designed for deep water, high-temperature and extreme pressure applications.
Sandvik's duplex stainless steel grades for umbilicals provide a range of materials whose inherent strength means lower weight through thinner walls and the ability to support its own weight in deep water, while maintaining excellent corrosion resistance, even at extreme water temperatures.
Super-duplex grade Sandvik SAF 2507 has all round excellent corrosion properties, a tensile strength of 800 to 1100MPa and can operate at a maximum water temperature of 65C.
By comparison, hyper-duplex Sandvik SAF 3207 HD has a tensile strength of 980 to 1180MPa and takes the maximum operating temperature up to 90C.
It has good weldability using welding procedures similar to those used for super-duplex, with the welded joint having excellent toughness, strength and corrosion resistance.
Stainless steel umbilical tubing from Sandvik is available in a range of sizes from 11 up to 89mm outside diameter.
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