17-4PH stainless steel, also known as UNS S17400 or DIN 1.4542, is a precipitation-hardening martensitic stainless steel. It offers an excellent combination of strength, hardness, corrosion resistance, and machinability—making it highly popular in demanding industries like aerospace, medical, and defense.
Chemical Composition & Mechanical Properties
| Element | Typical Content (%) |
|---|---|
| Chromium (Cr) | 15.0–17.5 |
| Nickel (Ni) | 3.0–5.0 |
| Copper (Cu) | 3.0–5.0 |
| Manganese (Mn) | ≤1.00 |
| Silicon (Si) | ≤1.00 |
| Carbon (C) | ≤0.07 |
| Phosphorus (P) | ≤0.04 |
| Sulfur (S) | ≤0.03 |
| Property | H900 Condition |
|---|---|
| Yield Strength | ≥ 1000 MPa |
| Tensile Strength | ≥ 1275 MPa |
| Hardness | HRC 40–44 |
| Elongation | ~10% |
Key Advantages of 17-4PH Steel Bars
-
High Strength after Heat Treatment
-
Excellent Corrosion Resistance
-
Good Machinability in Solution Annealed State
-
Weldable with Minimal Loss of Toughness
-
Dimensional Stability under Stress
Common Applications
-
Aerospace Components: turbine parts, fasteners, shafts
-
Medical Devices: surgical instruments, dental fixtures
-
Defense Equipment: firearm parts, structural frames
-
Oil & Gas: valves, pump shafts, couplings
-
Food Processing: machinery parts requiring hygiene and corrosion resistance
17-4PH stainless steel bars offer a well-balanced combination of mechanical strength, corrosion resistance, and process flexibility. These features make them a top choice for high-performance parts across various industries. Tongyi Metal supplies certified, high-quality 17-4PH steel bars with customized dimensions and stable lead times—your reliable partner for stainless solutions.
