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GENERAL SCOPE
17/4 PH is a precipitation hardening martensitic
stainless steel, containing Copper. In the solution treated and doubled aged condition it
has become the preferred alloy for Stems, Shafts, etc, and is used extensively in valve
internals. High strength, including good properties up to 315°C (600°F) and excellent
corrosion resistance (comparable to 304 austenitic stainless in many environments) makes
this alloy extremely versatile.
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.
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