15-5 PH Stainless Steel Round Bar (UNS S15500)
15-5 PH Stainless Steel Round Bar is a precipitation-hardening martensitic stainless steel developed from 17-4 PH, offering higher toughness, better transverse properties, and more uniform mechanical performance, especially in larger cross-sections. Identified by UNS S15500 / AMS 5659, this grade delivers an excellent balance of high strength, corrosion resistance, and dimensional stability.
It is widely preferred in aerospace and high-performance engineering applications where reliability and consistency are critical.
Key Features
- High strength achieved through precipitation hardening
- Superior toughness compared to 17-4 PH
- Excellent corrosion resistance in many environments
- Good transverse mechanical properties
- Minimal distortion during heat treatment
- Suitable for complex and thick cross-section components
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S15500 |
| EN | 1.4545 |
| DIN | X5CrNiCuNb15-5 |
| AMS | 5659 |
| ISO | X5CrNiCuNb15-5 |
Sizes
- Diameter: 3 mm to 500 mm
- Length: 3 m, 6 m, or cut-to-length
- Tolerance: H8 / H9 / H11 or as required
15-5 PH Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.07 |
| Chromium (Cr) | 14.0 – 15.5 |
| Nickel (Ni) | 3.5 – 5.5 |
| Copper (Cu) | 2.5 – 4.5 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Niobium + Tantalum | 0.15 – 0.45 |
UNS S15500 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1310 MPa |
| Yield Strength | ≥ 1170 MPa |
| Elongation | ≥ 10% |
| Hardness | 38 – 44 HRC |
SS 15-5 PH Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Melting Point | 1400 – 1440°C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 18 W/m·K |
| Electrical Resistivity | 0.80 µΩ·m |
Types of 15-5 PH Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Centerless Ground Bar
- Heat-Treated Round Bar (H900–H1150)
Applications
- Aerospace structural components
- Aircraft fittings and fasteners
- Pump shafts and valve parts
- Nuclear and power generation equipment
- Oil & gas components
- High-performance mechanical parts
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