Newly developed CRA
11 June 2018
In the oil and gas industry, the equipment used in exploration and extraction are constantly subject to corrosion due to contact with acid gases (carbon dioxide and hydrogen sulfides), chlorides at high temperatures.
Deutsche Edelstahlwerke has introduced Corrodur 4418 Mod (also known as Super 13 Cr) to the market to try and help mitigate these corrosion issues. This new corrosion resistant alloy (CRA) offers a material solution that surpasses the performance of conventional martensitic 13%-Chromium steels. The unique features of the new special steel are its high strength, outstanding toughness as well as good resistance to pitting corrosion and stress corrosion cracking. This makes it ideal to increase the lifecycle of completion tools and in fact this material has received qualification by Statoil ASA.
Corrodur 4418 was modified based on the material properties data suitable for mild sour gas (less than 0.01 bar ppH2S) conditions as defined by leading oil & gas companies like Statoil ASA. With a tensile strength of at least 862 MPa, a yield strength of at least 758 MPa and ductility (toughness) of at least 68 J at –10 °C. Another feature is the material's excellent resistance to pitting corrosion and stress corrosion cracking. Corrodur 4418 Mod is available in the diameters 50 to 216 mm, rolled and peeled. The range of dimensions covers sizes up to 280 mm in forged and peeled condition.
Image Caption: Completion tool for oil and gas extraction.
Image courtesy of Deutsche Edelstahlwerke / © iStockphoto-mikeuk