GRADE 17-4 PH
Stainless, Duplex, Super Duplex
UNS S17400 : ASTM A564 GRADE 630
In addition to limiting the hardness, NACE MR0175 restricts the age hardening cycles that can be applied to the alloy to two of the several available. NACE MR0175 only permits solution treatment, followed by double aging to either the H1150M condition 760°C (1400°F) / 620°C (1150°F) or the DH1150 condition 620°C (1150 °F) / 620°C (1150°F).
ASTM A564 lists several alternative supply conditions.
Until 2003 this alloy was approved by NACE MR0175 for general use. However, it is now restricted to “special components” and restricted well environments, more recently a Technical Circular was issued to restrict use based on the sustained stress a component is subject to.
|U.T.S||125 KSI Min||(862 N/mm2)|
|0.2% Proof Stress||105 KSI Min||(724 N/mm2)|
|Red of Area||50 %|
|CVN Impacts @ -29°C (-20°F)||40 Joules||(30 ft-lbf)|