17-4PH Stainless Steel
At a Glance
| Property | Details |
|---|---|
| Available Forms | Round Bar, Flat Bar, Plate, Sheet/Strip, Wire, Tube |
| Alloy Type | Precipitation-Hardening Martensitic Stainless Steel |
| Corrosion Resistance | Excellent corrosion resistance, comparable to 304 stainless steel in many environments |
| Hardness | Heat treatable to a wide range of strength and hardness levels |
| Durability | Exceptional combination of strength, toughness, and wear resistance |
| Key Advantages | High strength, good corrosion resistance, excellent mechanical properties, and dimensional stability during heat treatment |
| Common Applications | Aerospace components, oil & gas equipment, medical instruments, marine hardware, petrochemical and nuclear components |
| Specifications | AMS 5643, AMS 2303, ASTM A484, ASTM A564, AMS 5604, ASTM A693, UNS S17400 |
Introduction to 17-4PH Stainless Steel
17-4PH Stainless Steel, also known as Grade 630, is a precipitation-hardening martensitic stainless steel that combines high strength, hardness, and corrosion resistance. This alloy is widely used in industries such as aerospace, petrochemical, and marine applications, where superior performance under stress and corrosive environments is critical. Its ability to achieve high strength through heat treatment makes it a versatile choice for components requiring durability and resistance to wear.
High Strength Through Heat Treatment
One of the defining characteristics of 17-4PH Stainless Steel is its ability to reach high strength levels through a process of precipitation hardening. By applying heat treatment, 17-4PH can be tuned to achieve a variety of mechanical properties, making it ideal for applications that demand specific hardness and tensile strength. Its strength and toughness remain consistent across a range of temperatures, providing excellent performance in high-stress environments.
Corrosion Resistance and Durability
17-4PH offers excellent corrosion resistance, comparable to 304 stainless steel in many environments, making it well-suited for applications in chemical processing, marine environments, and oil and gas industries. Its combination of strength and corrosion resistance allows for long-lasting performance, even in demanding operating conditions.
Applications of 17-4PH Stainless Steel
17-4PH Stainless Steel’s versatility and mechanical properties make it a preferred material for a variety of demanding applications:
- Aerospace Components: Used in aircraft structural parts, turbine blades, and engine components where high strength-to-weight ratios are critical.
- Oil and Gas Equipment: Ideal for valves, fittings, and fasteners exposed to high pressures and corrosive environments.
- Medical Instruments: Frequently used for surgical instruments and medical devices that require high durability and corrosion resistance.
- Marine Applications: Well-suited for shafts, pumps, and components where both strength and corrosion resistance are essential.
- Nuclear and Petrochemical Industries: Used for parts that require both high strength and resistance to aggressive chemicals.
Chemical Data, Mechanical Properties and Specifications for 17-4PH Stainless Steel
Chemical Range
| Element | Minimum | Maximum |
|---|---|---|
| Carbon | -- | 0.07 |
| Chromium | 15 | 17.5 |
| Copper | 3.0 | 5.0 |
| Iron | Balance | -- |
| Manganese | -- | 1.0 |
| Nickel | 3 | 5 |
| Niobium | -- | 0.45 |
| Niobium + Tantalum | 0.15 | 0.45 |
| Phosphorus | -- | 0.040 |
| Silicon | -- | 1 |
| Sulphur | -- | 0.030 |
Typical Mechanical Properties
| Temper | Tensile Strength | Yield Strength | Elongation at Break |
|---|---|---|---|
| H1025 | 168 ksi | 162 ksi | 16.0% |
| H1075 | 164 ksi | 148 ksi | 17.0% |
| H1150 | 144 ksi | 126 ksi | 20.0% |
Specifications
- AMS 5643 (Bar)
- AMS 2303 (Bar)
- ASTM A484 (Bar)
- ASTM A564 (Bar)
- Project 70™ (Bar)
- Custom 630™ (Bar)
- AMS 5604 (Sheet & Plate)
- ASTM A693 (Sheet & Plate)
- UNS S17400