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AISI 347 Stainless Steel Coil
Available Configurations
Properties common to all products in this list
Key Features
AISI 347 Stainless Steel Coil (UNS S34700) is a niobium-stabilized austenitic stainless steel in continuous coil form, engineered for superior resistance to sensitization, intergranular corrosion, oxidation, and creep at elevated temperatures:
Niobium Carbides Prevent Chromium Depletion at Grain Boundaries
The niobium addition — at minimum ten times the carbon content — forms stable niobium carbides that prevent chromium depletion at grain boundaries, giving AISI 347 superior high-temperature stability.
Better High-Temperature Stability Than 321 Above 700 °C
AISI 347 offers better high-temperature stability than titanium-stabilized 321 in many service environments, particularly above 700 °C, where niobium carbide stability provides a meaningful performance advantage.
Excellent Formability & Dimensional Precision
In coil form, AISI 347 delivers excellent formability, uniform surface quality, and dimensional precision for fabrication of large-area components in aerospace, power generation, petrochemical, and marine sectors.
Superior Resistance to Oxidation & Creep at Elevated Temperatures
Superior resistance to oxidation and creep at elevated temperatures suits AISI 347 Coil to heat exchanger plates and furnace linings exposed to demanding thermal conditions.
Suited to High-Temperature Process Ducting
Cladding for high-temperature process ducting benefits from AISI 347's combination of niobium-stabilized carbide stability and resistance to sensitization at elevated service temperatures.
Industrial Applications
AISI 347 Stainless Steel Coil is used across aerospace, power generation, petrochemical, and marine sectors where high-temperature stability above 700 °C is required:
- ✦ Heat Exchanger Plates
- Used in heat exchanger plates, where superior resistance to oxidation and creep at elevated temperatures ensures reliable, long-term heat transfer performance.
- ✦ Furnace Linings
- Formed into furnace linings, where niobium carbide stability gives AISI 347 better high-temperature stability than titanium-stabilized 321 in many service environments, particularly above 700 °C.
- ✦ Cladding for High-Temperature Process Ducting
- Applied as cladding for high-temperature process ducting, where resistance to sensitization, intergranular corrosion, oxidation, and creep ensures durable performance under sustained thermal exposure.
- ✦ Large-Area Component Fabrication for Aerospace & Power Generation
- Used in fabrication of large-area components for aerospace, power generation, petrochemical, and marine sectors, where excellent formability and dimensional precision support efficient large-scale production.
- ✦ High-Temperature Oxidation & Creep Behavior Research
- Used in high-temperature oxidation resistance studies, creep and fatigue behavior investigations, and surface treatment effect evaluations.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 160-190 |
| Elongation at break( % ) | <60 |
| Modulus of elasticity( GPa ) | 190-210 |
| Izod impact strength( J m⁻¹ ) | 20-136 |
| Tensile strength( MPa ) | 520-1100 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 70-73 |
| Element | Value |
|---|---|
| Maximum use temperature in air( C ) | 800 |
| Melting point( C ) | 1400-1425 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 16.3@100°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 16-18@20-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 7.93 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Coil Width | <100mm | ±1mm |
| Coil Width | >=100mm | +2% / -1% |
| Length | +10% / -0% |