Product Description

BÖHLER N425 (UNS S41427) -Super 13Cr -is a martensitic stainless steel with a Nickel content of about 5% and 2% Molybdenum that offers high performance and excellent corrosion resistance in CO2 environment, chlorides and low concentrations of H2S. The low carbon improves weldability while maintaining the martensitic microstructure.
During production, special attention is paid to fine grain and lowest delta ferrite content and the material is specially tested for toughness and behaviour under sour gas stress.
Due to the higher alloy content, the corrosion resistance of BÖHLER N425 is higher than that of 13%Cr stainless steels. As a result of the chemical analysis and its microstructure, BÖHLER N425 is particularly insensitive to intergranular corrosion and very resistant to fatigue and stress corrosion cracking.
To achieve the best possible corrosion resistance with BÖHLER N425, it is essential to polish the surfaces concerned.
BÖHLER N425 offers good mechanical properties in the quenched and tempered condition and very good low temperature properties. Recommended temperature of use: – 60 to 350°C.

BÖHLER N425 is available in two conditions. A 95 ksi min yield condition that is suitable for limited NACE sour service with a maximum hardness of 29 HRC. A 110 ksi version is also available for standard and CO2 service. This material is used in downhole completion tools for components such as packers, safety valves as well as other applications.