347 Stainless Steel Plate
Stellanox Steel offers premium 347 stainless steel plates that are made to operate very well in hot and intensively welded conditions. 347 is a niobium-stabilized austenitic stainless steel that has exceptional mechanical strength, thermal stability, and resistance to intergranular corrosion following welding.
347 stainless steel is widely used in heat exchangers, high-pressure steam lines, furnace parts, and chemical processing facilities. It is perfect for uses that require a lot of heat cycling and extreme stress.
What is 347 Stainless Steel Plate?
The austenitic stainless steel alloy known as 347 Stainless Steel Plate is stabilised with niobium (columbium) to stop the production of chromium carbides during welding or extended exposure to high temperatures. It comprises chromium (17–19%) and nickel (9–13%).
since of its stabilisation, 347 is particularly beneficial for high-heat welded applications, refinery equipment, and pressure vessels since it can withstand intergranular corrosion. When greater strength and heat resistance are needed, it is a fantastic substitute for 304/304L.
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features of 347 Stainless Steel Plate
- When welding, niobium stabilisation stops intergranular corrosion.
- Excellent Creep and Stress Rupture Strength: Perfect for hot, high-pressure settings.
- Thermal Fatigue Resistant: Functions effectively in the presence of frequent temperature fluctuations.
- Outstanding Resistance to Oxidation: Able to tolerate high temperatures of up to 870°C (1600°F).
- Non-Magnetic: When it is annealed.
- Excellent Weldability and Formability: Ideal for intricate assembly tasks and production.
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 |