347 Stainless Steel Plate
Stellanox Steel supplies high-quality 347 Stainless Steel Plates, designed for exceptional performance in high-temperature and heavily welded environments. As a niobium-stabilized austenitic stainless steel, 347 provides excellent resistance to intergranular corrosion after welding, along with superior mechanical strength and thermal stability.
Used extensively in heat exchangers, high-pressure steam lines, furnace components, and chemical processing plants, 347 stainless steel is ideal for applications involving frequent thermal cycling and intense stress.
What is 347 Stainless Steel Plate?
347 Stainless Steel Plate is an austenitic stainless steel alloy that contains chromium (17–19%), nickel (9–13%), and is stabilized with niobium (columbium) to prevent the formation of chromium carbides during welding or prolonged exposure to elevated temperatures.
This stabilization allows 347 to resist intergranular corrosion, making it especially useful for pressure vessels, refinery equipment, and high-heat welded applications. It is a great alternative to 304/304L where improved strength and thermal resistance are required.
| Products |
|---|
|
Stainless Steel |
|
Carbon Steel |
|
Duplex Stainless Steel |
|
Super Duplex Stainless Steel |
|
Alloy Steel |
|
Titanium |
|
Hastelloy |
|
Inconel |
|
Monel |
|
Aluminium |
|
Copper |
|
Pure Nickel |
|
Flanges |
|
Forged Fittings |
|
Valves |
|
Fasteners |
Key Features of 347 Stainless Steel Plate
- Niobium Stabilized: Prevents intergranular corrosion during welding.
- Superior Creep and Stress Rupture Strength: Ideal for high-pressure, high-heat environments.
- Thermal Fatigue Resistant: Performs well under frequent temperature changes.
- Excellent Oxidation Resistance: Withstands elevated temperatures up to 870°C (1600°F).
- Non-Magnetic: In the annealed condition.
- Good Formability and Weldability: Suitable for fabrication and complex assembly work.
Specification Chart – 347 Stainless Steel Plate
| Property | Details |
|---|---|
| Standard | ASTM A240 / ASME SA240 |
| Grade | 347 (UNS S34700) |
| Thickness Range | 3.0 mm to 100 mm |
| Width | Up to 2000 mm |
| Length | 2000 mm to 6000 mm (custom lengths available) |
| Finish Types | No.1, 2B, No.4, BA, Hairline, Polished |
| Edge Condition | Mill Edge, Slit Edge |
| Surface Protection | PVC Coated / Paper Interleaf |
Chemical Composition – 347 Stainless Steel Plate
| Element | Symbol | Composition (%) |
|---|---|---|
| Chromium | Cr | 17.0 – 19.0 |
| Nickel | Ni | 9.0 – 13.0 |
| Carbon | C | ≤ 0.08 |
| Manganese | Mn | ≤ 2.0 |
| Silicon | Si | ≤ 0.75 |
| Phosphorus | P | ≤ 0.045 |
| Sulfur | S | ≤ 0.030 |
| Niobium + Tantalum | Nb + Ta | ≥ 10x C (min) |
| Iron | Fe | Balance |
Mechanical Properties – 347 Stainless Steel Plate
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 515 |
| Yield Strength (MPa) | ≥ 205 |
| Elongation (%) | ≥ 40 |
| Hardness (HRB) | ≤ 95 |
| Modulus of Elasticity | 193 GPa |
| Density | 7.90 g/cm³ |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | 347 |
| EN | 1.4550 |
| JIS | SUS 347 |
| UNS | S34700 |
| DIN | X6CrNiNb18-10 |
347 Stainless Steel Plate Weight Chart
| Thickness (mm) | Weight per m² (kg) | Weight per 4’ x 8’ Plate (kg) |
|---|---|---|
| 3.0 | 23.70 | 57.94 |
| 5.0 | 39.50 | 96.54 |
| 6.0 | 47.40 | 115.85 |
| 8.0 | 63.20 | 154.44 |
| 10.0 | 79.00 | 193.03 |
| 12.0 | 94.80 | 231.62 |
| 16.0 | 126.40 | 308.80 |
| 20.0 | 158.00 | 386.00 |
| 25.0 | 197.50 | 482.50 |
Applications of 347 Stainless Steel Plate
- High-temperature chemical processing systems
- Welded pressure vessels and heat exchangers
- Thermal oxidizers, exhaust systems
- Aircraft collector rings and exhaust manifolds
- Petrochemical reactors and refining equipment
- Furnace and incinerator components
Benefits of 347 Stainless Steel Plate
- Superior welding performance at elevated temperatures
- Enhanced resistance to stress rupture and thermal fatigue
- Maintains mechanical integrity in harsh environments
- Suitable for complex fabrication and custom welded assemblies
- Ideal for cyclic high-heat operations
- Excellent oxidation and scaling resistance
2025 Stellanox Steel |