17-4 Stainless Steel Round Bar (UNS S17400)
17-4 Stainless Steel Round Bar, also known as AISI 630 / UNS S17400, is a precipitation-hardening martensitic stainless steel that combines high strength, excellent corrosion resistance, and good mechanical properties. It is widely used in applications requiring high load-bearing capacity along with resistance to corrosion and oxidation.
This grade can be heat treated to achieve a wide range of strength and toughness levels, making it highly versatile for industrial and engineering applications.
Key Features
- High tensile and yield strength after heat treatment
- Excellent corrosion resistance comparable to 304 stainless steel
- Good machinability in solution-annealed condition
- Superior fatigue strength
- Dimensional stability during heat treatment
- Suitable for high-temperature applications up to 315°C
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S17400 |
| AISI | 630 |
| EN | 1.4542 |
| DIN | X5CrNiCuNb16-4 |
| JIS | SUS 630 |
Sizes
- Diameter: 3 mm to 500 mm
- Length: 3 meters, 6 meters, or custom cut lengths
- Tolerance: H8 / H9 / H11 or as per customer requirement
17-4 Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.07 |
| 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 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Niobium + Tantalum | 0.15 – 0.45 |
UNS S17400 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1310 MPa |
| Yield Strength | ≥ 1170 MPa |
| Elongation | ≥ 10% |
| Hardness | 38 – 44 HRC |
SS 17-4 Tube 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 17-4 Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Centerless Ground Bar
- Heat Treated Round Bar (H900 to H1150)
Applications
- Aerospace components
- Oil & gas equipment
- Pump shafts and valve parts
- Marine hardware
- Power generation components
- Chemical processing equipment
- Food processing machinery
- Medical and surgical instruments
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