New special steel corrodur 4118 Mod for well fluids

In oil and gas exploration and extraction, the materials handling and production systems are constantly subject to corrosion due to contact with acid gases and chlorides at high temperatures.

By introducing special steel Corrodur 4418 Mod (also known as Super 13 Cr), Deutsche Edelstahlwerke 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 special steel ideal to increase the lifecycle of completion tools. Deutsche Edelstahlwerke became one of the first steel producers to achieve qualification by Statoil ASA for the special steel Corrodur 4418 Mod.

In oil and gas exploration the well fluids often contain acidic gases and chlorides. The hydrogen sulfides reaction with steel components used can, in the worst case, suffer sulphide stress corrosion cracking. The chlorides present in well fluids are also corrosive, causing pitting corrosion. By introducing Corrodur 4418 Mod, Deutsche Edelstahlwerke offers a high-grade steel superior in durability to the conventionally used 13%-Chromium steel grades such as 1.4006 (AISI 410) and 1.4021 (AISI 420).

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. Corrodur 4418 Mod is available in the diameters 50 to 216 mm, rolled and peeled.

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