Duplex Stainless Steels are required in sweet (CO2) environments containing chlorides or dissolved oxygen, where pitting and crevice corrosion are a concern. Cold worked tubes are available with yield strengths up to 140 ksi.
Super Duplex Stainless Steels extend the useful range of temperature and chlorides. Defined by a Pitting Resistance Equivalent Number (PREN) greater than 40, they are recommended for conditions with high chlorides or dissolved oxygen, such as seawater and water injection wells. Super Duplex Stainless Steels are approved for slightly sour environments in accordance with NACE MR0175/ISO 15156.
UNS S31803 / 2205 Duplex / 22Cr
22 Chrome is a cold hardened duplex stainless steel intended for corrosion resistance in sweet (CO2) and mildly sour (H2S) environments with moderate chloride content, requiring high strength up to 400°F.
UNS S31260 / 2507 Duplex / 25Cr / Chromium-25
25 Chrome is a cold hardened duplex stainless steel intended for corrosion resistance in sweet (CO2) and mildly sour (H2S) environments with high chloride content, requiring high strength up to 450°F.
UNS S32750 / UNS S32760 / UNS S39274 / Z100 / 25CRS
Super Duplex 25 Chrome grades, 25CRW & 25CRS, are cold hardened duplex stainless steels intended for corrosion resistance in sweet (CO2) and moderately sour (H2S) environments with high chloride content, requiring high strength up to 450°F. The “Super” designation indicates that it has a Pitting Resistance Equivalence (PREN) ≥40.