Downhole casing and production tubing (OCTG)
Downhole casing and production tubing in CRA (corrosion resistant alloys) such as duplex stainless steels and austenitic Fe- and Ni-base alloys, Groups 2, 3 and 4, API 5 CRA (ISO 13680). These materials are ideal to cope with the aggressive environments found in wells sour from hydrogen sulfide, carbon dioxide and other chemicals.
Predominantly, Sandvik's downhole casing and tube material is supplied in the cold-worked condition to ensure high strength and weight effective design solutions.
Sandvik carries five grade alternatives for plain end pipe for downhole casing, production tubing and coupling stock. Please contact us for a reference list of Sandvik's products for OCTG and downhole applications.
|Sandvik grade||Grade description|
(22Cr, UNS S31803/ S32205)
|SAF 2205™ / 22Cr is a duplex stainless steel, which is resistant to CO2 -corrosion and to sour corrosion at low partial pressures of H2S.|
(25Cr, UNS S32750)
|SAF 2507® / 25Cr is a super-duplex stainless steel similar to SAF 2205™ / 22Cr, but with slightly improved H2S resistance and significantly higher resistance to chloride-induced corrosion.|
|SAF 3207 HD™ (UNS S33207)||SAF 3207 HD™ is a hyper-duplex stainless steel with exceptional strength and excellent resistance to stress corrosion cracking (SCC) in hydrogen sulfide (H2S) and chloride containing environments.|
|Sanicro® 28 is a high alloy stainless steel comparable with Alloy 825. It has excellent resistance to corrosion in severe downhole environments, especially to high partial pressures of H2S and high chloride contents.|
|Sanicro® 29||For very high chloride contents in combination with high partial pressures of H2S. Sanicro® 29 provides even better resistance to localized corrosion and sulfide stress cracking compared to Sanicro® 28.|
|Sanicro® 48||As an austenitic nickel-base alloy for highly corrosive OCTG downhole applications, Sanicro® 48 is characterized by its excellent resistance to sulfide stress cracking, stress corrosion cracking (SCC) in chloride, and sour (H2S/Cl) environments and its very high resistance to pitting and crevice corrosion.|
|Sandvik grade*||Yield strength
|SAF 2205™ / 22Cr||75–100||95||25||28|
|SAF 2507® / 25Cr||≥80||116||25||32|
|SAF 3207 HD™||≥112||≥138||15||36|
*All grades are included in NACE MR 0175 and ISO 15156.
Production tubing is supplied in outside diameters up to and including 7 3/4".
Other sizes are available on request for Mother tubes for Couplings, x-overs and other accessories.