17-4 PH Equivalent Material: A Comprehensive Guide
Introduction
17-4 PH is a type of precipitation-hardening (PH) stainless steel that is widely used in various industries due to its excellent mechanical properties, corrosion resistance, and weldability. However, in some cases, a 17-4 PH equivalent material may be required due to factors such as cost, availability, or specific application requirements. In this article, we will explore the properties of 17-4 PH and its equivalent materials.
Properties of 17-4 PH
Chemical Composition
17-4 PH is an alloy of iron, chromium, nickel, and copper, with the following nominal chemical composition:
- Fe: 68.5%
- Cr: 15.5%
- Ni: 4.5%
- Cu: 3.5%
- Nb + Ta: 0.45%
- C: 0.07%
Mechanical Properties
17-4 PH exhibits excellent mechanical properties, including:
- Yield strength: 110,000 - 140,000 psi (760 - 965 MPa)
- Ultimate tensile strength: 140,000 - 170,000 psi (965 - 1172 MPa)
- Rockwell hardness: 40 - 45 HRC
- Corrosion resistance: High resistance to corrosion in marine environments, acids, and chlorides
17-4 PH Equivalent Materials
Several materials exhibit similar properties to 17-4 PH, including:
1. Alloy 630 (17-4 PH)
Alloy 630 is a precipitation-hardening stainless steel that is essentially identical to 17-4 PH. It is also known as 17-4 PH in some countries.
2. UNS S17400
UNS S17400 is a type of precipitation-hardening stainless steel that is similar to 17-4 PH. It has a slightly different chemical composition, but exhibits similar mechanical properties.
3. AISI 630
AISI 630 is an American standard for precipitation-hardening stainless steel that is equivalent to 17-4 PH.
4. X5CrNiCuNb16-4
X5CrNiCuNb16-4 is a European standard for precipitation-hardening stainless steel that is similar to 17-4 PH.
5. PH 15-7 Mo
PH 15-7 Mo is a precipitation-hardening stainless steel that exhibits similar properties to 17-4 PH, although it has a slightly different chemical composition.
Applications
17-4 PH and its equivalent materials are widely used in various industries, including:
- Aerospace
- Marine hardware
- Chemical processing
- Oil and gas
- Food processing
- Medical devices
Conclusion
17-4 PH is a versatile and widely used precipitation-hardening stainless steel. Its equivalent materials offer similar properties and are used in various industries. When selecting a material, it is essential to consider factors such as cost, availability, and specific application requirements to ensure the most suitable choice.
