In warm chloride environments, 17-4 PH is susceptible to pitting and crevice corrosion. When aged at 550°C or higher, 17-4 PH is highly resistant to stress corrosion cracking. Better stress corrosion cracking resistance comes with higher ageing temperatures.
Carbon: 0.07% (Max)
Silicon: 1.00% (Max)
Manganese: 1.00% (Max)
Phosphorous: 0.040% (Max)
Sulfur: 0.030% (Max)
Chromium: 15%-17.5%
Molybdenum: 0.50% (Max)
Nickel: 3%-5%
Copper: 3%-5%
17-4PH is a precipitation hardening martensitic stainless steel, which combines high strength and hardness (after heat treatment) with excellent corrosion resistance, and is suitable for easy fabrication.
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