Steel Strip Profiles
347 Stainless Steel Strip
347 stainless steel strip offers robust protection against intergranular corrosion and maintains its strength in high-temperature service. With niobium stabilization, it’s particularly suited for heat-affected welding zones, high-pressure piping, and critical components in petrochemical and thermal systems. Durable, weldable, and heat-resistant, it’s the material of choice for demanding structural and industrial applications.
Product Introduction
347 stainless steel strip is an austenitic stainless steel stabilized with niobium (columbium) to provide superior resistance to intergranular corrosion, especially after welding. It performs well in high-temperature service and retains excellent mechanical properties. This grade is widely used in thermal expansion joints, aircraft exhausts, and high-temperature chemical environments where strength and long-term corrosion resistance are critical.
Product Specifications
- Grade: 347 / UNS S34700
- Thickness: 0.01mm – 5.0mm
- Width: 10mm – 700mm
- Surface Finish: 2B, BA, No.4, HL, Mirror
- Edge: Slit Edge / Mill Edge
- Standard: ASTM A240, EN 10088-2, JIS G4304
Key Features
- 🔥 Niobium-stabilized for intergranular corrosion resistance
- ⚙️ Excellent high-temperature strength
- 🛡️ Superior weldability and oxidation resistance
- 📈 Performs well under thermal cycling
- 🌡️ Withstands temperatures up to 870°C (1600°F)
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Niobium (Nb) | ≥ 10 × C (min) |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 95 HRB |
Equivalent Grades
| Standard | Equivalent |
|---|---|
| UNS | S34700 |
| EN | 1.4550 |
| JIS | SUS 347 |
Applications
- ✈️ Aircraft engine and exhaust parts
- 🔥 Heat exchangers and superheaters
- 📏 Expansion joints and piping systems
- 🏭 Chemical and petroleum refining equipment
- 🚀 High-temperature furnace parts
FAQ – Frequently Asked Questions
- ❓ Q: What is the advantage of using niobium in 347 stainless steel?
💡 A: It stabilizes the structure, preventing intergranular corrosion during welding or heating. - ❓ Q: Is 347 better than 321 for high heat?
💡 A: 347 offers comparable high-temperature strength with better stress rupture properties. - ❓ Q: Can 347 be cold rolled and slit to custom sizes?
💡 A: Yes, we offer custom thickness, width, and edge processing. - ❓ Q: Does 347 strip require post-weld annealing?
💡 A: No, it is designed to resist weld decay without post-treatment.
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