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Steel
Alloy Selection
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The 17-4PH stainless steel alloy
achieves a range of high strength properties with different controlled
precipitation aging treatments.
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The
ultimate strength, yield strength, hardness, and toughness of 17-4PH
are determined by the heat treat condition, as
shown in the figure to the right.
When aged at 1000 F or higher, 17-4PH is highly
resistant to stress corrosion cracking.
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Specifications for 17-4PH stainless steel are
defined by AMS, ASTM, and UNS.
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The 17-4PH alloy
is widely used for a variety of
applications including oil field valve parts, chemical process
equipment, aircraft fittings, jet engine parts, pump shafts, missile fittings,
nuclear
reactor components, paper mill equipment, and gears.
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