Hastelloy S Round Bar (UNS N06635)
Hastelloy S Round Bar is a nickel–chromium–molybdenum alloy developed for exceptional high-temperature strength and resistance to thermal shock. It is particularly valued for its excellent resistance to oxidation, carburization, and metal dusting, along with outstanding stability during prolonged exposure to elevated temperatures. Hastelloy S is widely used in aerospace, heat-treating, and high-temperature industrial environments.
Key Features
- Excellent oxidation resistance up to ~900 °C
- Superior resistance to thermal fatigue and thermal shock
- High creep and stress-rupture strength
- Good resistance to carburization and metal dusting
- Stable microstructure during long-term high-temperature exposure
- Good weldability and fabrication characteristics
Equivalent Grades
| Standard | Equivalent |
|---|---|
| UNS | N06635 |
| ASTM | Hastelloy S |
Sizes
- Diameter: 6 mm to 300 mm
- Length: Random, Cut Length, or as per customer requirement
Hastelloy S Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 14.0 – 16.5 |
| Molybdenum (Mo) | 14.0 – 17.0 |
| Iron (Fe) | ≤ 3.0 |
| Cobalt (Co) | ≤ 2.0 |
| Carbon (C) | ≤ 0.02 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
UNS N06635 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 690 MPa |
| Yield Strength (0.2%) | ≥ 310 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 90 HRB |
UNS N06635 Physical Properties
| Property | Value |
|---|---|
| Density | 8.9 g/cm³ |
| Melting Range | 1260 – 1350 °C |
| Modulus of Elasticity | 205 GPa |
| Thermal Conductivity | 11.0 W/m·K |
Types of Hastelloy S Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Forged Round Bar
- Precision Machined Bar
Applications
- Aerospace hot-section components
- Heat-treating furnace fixtures
- High-temperature fasteners
- Petrochemical processing equipment
- Power generation components
- Thermal cycling and shock-resistant parts
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