Alloy Geek 17-4PH Precipitation-Hardening Stainless Steel Standard
17-4PH, also known as Alloy 17-4 or UNS S17400, is a precipitation-hardening stainless steel alloy. It's valued for its combination of high strength, corrosion resistance, and the ability to be heat treated to achieve various levels of mechanical properties. The "PH" in the name stands for "precipitation hardening," which refers to the process of strengthening the alloy through heat treatment.
Chemical Composition of 17-4PH Stainless Steel:
- Chromium (Cr): 15-17.5%
- Nickel (Ni): 3-5%
- Copper (Cu): 3-5%
- Manganese (Mn): 1% max
- Silicon (Si): 1% max
- Tantalum (Ta): 0.45% max (Nb + Ta = 0.15-0.45)
- Niobium (Nb): 0.45% max (Nb + Ta = 0.15-0.45)
- Carbon (C): 0.07% max
- Phosphorous (P): 0.04% max
- Sulfur (S): 0.03% max
- Iron(Fe): Balance
Key features and characteristics of 17-4PH:
High Strength: 17-4PH offers a high level of strength, making it suitable for applications that require strong materials. The alloy can be precipitation hardened to achieve even higher strength levels.
Corrosion Resistance: The alloy provides good corrosion resistance, especially in environments that are not highly aggressive. It's not as corrosion-resistant as some other stainless steels like 316, but it's still suitable for many applications.
Heat Treatment: The precipitation-hardening heat treatment process involves aging the alloy at an elevated temperature, which increases its strength while maintaining a certain level of toughness.
Applications: 17-4PH is used in various industries, including aerospace, petrochemical, and medical. It's chosen for applications like gears, shafts, valves, fasteners, and components requiring a combination of strength and corrosion resistance.
Formability: The alloy can be formed and fabricated using standard methods.
Weldability: The alloy can be welded using common techniques, although some precautions might be necessary to maintain its corrosion resistance and mechanical properties.
Magnetic Properties: 17-4PH is magnetic due to its precipitation hardening process.
Forms: 17-4PH is available in various forms, including sheets, plates, bars, and wires.
Due to its combination of strength, corrosion resistance, and heat treatability, Alloy 17-4PH is well-suited for applications that require excellent mechanical properties. If you're considering using 17-4PH for a specific project, consulting with materials experts or manufacturers is recommended to ensure it meets your desired performance requirements, especially in terms of strength, corrosion resistance, heat treatability, and compatibility with the specific conditions of your application.
XRF standards are thin samples typically around 1/4" thick while OES standards are typically much thicker to allow for sample preparation.
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