SAF™ 3207 HD (UNS S33207) is a hyper-duplex stainless steel; a high-alloy duplex steel with a PRE value of min. 50*. The grade is characterized by excellent corrosion resistance in chloride environments, such as seawater, combined with exceptionally high mechanical strength.
SAF™ 3207 HD hyper-duplex steel has been developed for deepwater applications with extreme requirements on pitting and crevice corrosion resistance, mechanical strength and fatigue properties.
Offering greater yield strength, greater corrosion resistance and superior fatigue properties compared with super-duplex steels, SAF™ 3207 HD hyper-duplex steel is also an excellent material choice for a range of other oil and gas applications. For example, when resistance to hydrogen sulfide (H2S) is a requirement, such as in raw seawater injection, control lines and chemical injection lines, SAF™ 3207 HD offers high reliability and operational safety leading to lower operating costs.
The excellent yield strength of SAF™ 3207 HD contributes to lighter installations. It enables tubes with thinner walls to be used that withstand the same pressure levels as tubes with thicker walls in other materials.
* PRE stands for pitting resistance equivalent and is defined as, in weight-%:
% Cr + 3.3 x % Mo + 16 x % N
The PRE value mentioned above is valid for tube and pipe.