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347 Thanh tròn bằng thép không gỉ: Stabilized Austenitic Grade for High-Temperature Corrosion Resistance
347 stainless steel round bar is a columbium (niobi)-stabilized austenitic stainless steel designed to resist intergranular corrosion in high-temperature environments. It is widely used in applications where welding, heat exposure, and long-term structural stability are required at the same time.
So với tiêu chuẩn 304 hoặc 316 thép không gỉ, 347 stainless steel provides improved resistance to carbide precipitation, making it particularly suitable for welded components exposed to temperatures between 800°F and 1500°F (427°C–816°C).
Thành phần hóa học của 347 thép không gỉ
Tính năng chính của 347 stainless steel is the addition of niobium (columbi), which stabilizes carbon and prevents chromium carbide formation during welding or high-temperature service.
| Yếu tố | Nội dung tiêu biểu (%) | Chức năng |
|---|---|---|
| crom (Cr) | 17.0 – 19.0 | Corrosion and oxidation resistance |
| Niken (TRONG) | 9.0 – 13.0 | Austenitic stability and toughness |
| Niobi (Nb) | ≥ 10 × C content | Stabilizes carbon, prevents sensitization |
| Cacbon (C) | ≤ 0.08 | Controlled for weldability |
| Mangan (Mn) | ≤ 2.0 | Structural stability |
| Silicon (Và) | ≤ 1.0 | Oxidation resistance improvement |
| Sắt (Fe) | Sự cân bằng | Base matrix |
Key Performance Advantages of 347 Thanh tròn bằng thép không gỉ
347 stainless steel is designed for environments where both heat and welding are unavoidable. Its niobium stabilization provides a strong advantage in preventing intergranular corrosion after welding.
- Excellent resistance to intergranular corrosion after welding
- Stable performance in high-temperature service conditions
- Good oxidation resistance up to ~870°C–900°C
- Strong mechanical stability under thermal cycling
- Suitable for continuous and intermittent heat exposure
Industrial Applications of 347 Thanh tròn bằng thép không gỉ
347 stainless steel round bar is widely used in industries requiring long-term exposure to heat and corrosive environments, especially where welded structures are unavoidable.
- Heat exchangers and boiler components
- Furnace parts and high-temperature supports
- Thiết bị xử lý hóa chất
- Petrochemical refinery piping systems
- Exhaust manifolds and high-temperature engine components
- Power generation and thermal processing systems
In large-scale engineering supply chains, companies like Teda Ganghua provide stabilized stainless steel bars with controlled chemistry and precise dimensional tolerance to support industrial fabrication requirements.
For broader stainless steel structural and bar products, visit
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Comparison with Related Stainless Steel Grades
| Cấp | Tính năng chính | Hiệu suất hàn | Typical Application |
|---|---|---|---|
| 304 | Chống ăn mòn chung | Tốt | Thiết bị thực phẩm, cấu trúc |
| 321 | Ổn định bằng titan | Tốt | High-temperature welded parts |
| 347 | Niobium-stabilized | Xuất sắc | Severe weld + heat environments |
Fabrication and Machining Notes
347 stainless steel round bar is more stable in welded conditions, but it still requires controlled fabrication techniques due to its austenitic structure.
- Use low-to-medium cutting speeds to avoid work hardening
- Carbide tools are recommended for machining
- Avoid overheating during welding and grinding
- Ensure proper shielding gas during welding processes
Teda Ganghua Supply Capability for 347 thép không gỉ
Teda Ganghua supplies industrial-grade stainless steel round bars including stabilized grades such as 347, supporting global customers in petrochemical, năng lượng, and heat-processing industries.
- Controlled chemical composition for stable performance
- Multiple diameter options and custom cutting services
- Export packaging for industrial shipments
- OEM support for engineering projects
Câu hỏi thường gặp
1. What is 347 stainless steel round bar used for?
It is mainly used in high-temperature welded applications such as heat exchangers, boilers, and chemical processing systems.
2. What makes 347 stainless steel different from 304?
347 contains niobium stabilization, which prevents carbide precipitation and improves resistance to intergranular corrosion after welding.
3. Can 347 stainless steel handle high temperatures?
Đúng, it performs well in continuous service up to around 870°C–900°C depending on environment.
4. Is 347 stainless steel good for welding?
Đúng, it is specifically designed for welded structures and maintains corrosion resistance after welding.
5. Does Teda Ganghua supply 347 thanh tròn thép không gỉ?
Đúng, Teda Ganghua provides stabilized stainless steel round bars with industrial-grade quality control and export-ready supply.
