Ribbed Tube with Enhanced Heat Transfer Efficiency Anti-Film Formation and Uniform Wall Temperature for High-Temperature Applications
Inner-ribbed seamless steel tubes (also known as internally threaded tubes) are precision cold-drawn or cold-rolled tubes engineered to enhance heat transfer efficiency in high-temperature environments. By forming continuous spiral ribs on the inner wall, these tubes significantly improve fluid turbulence, reduce steam film formation, and ensure uniform heat distribution—making them ideal for boiler evaporator systems and high-performance heat exchangers.
| Parameter | Description |
|---|---|
| Material | ASTM SA210 A1 / SA210 C / SA213 T2 |
| Standard | ASTM A210 / ASTM A213 |
| Grade | A1, C, T2 |
| Outer Diameter (OD) | 28.6 mm / 38.1 mm / 63.5 mm / 66.7 mm |
| Wall Thickness (WT) | 6.2 mm / 7.5 mm / 8 mm |
| Length | 1-12 meters (customizable) |
| Tolerance | OD: ±0.75% / WT: ±10% |
| Straightness | ≤1/1000 of total length |
| Surface Condition | Pickled / Oiled / Phosphated |
| Heat Treatment | Normalized / Annealed |
- Enhanced Heat Transfer Efficiency: Internal spiral ribs increase heat transfer coefficient by 1.5-2.5 times compared to plain tubes
- Anti-Film Formation: Effectively disrupts steam film formation, improving thermal conductivity and preventing overheating
- Uniform Wall Temperature: Reduces localized hot spots, minimizing risk of tube failure
- Precision Rib Geometry: Rib count options (4, 6, 8, 12) with consistent pitch and depth ensure optimized fluid dynamics
- High Dimensional Accuracy: Cold drawing process ensures tight tolerances and superior internal surface quality
We utilize advanced cold-drawing mandrel technology combined with in-line dimensional inspection systems to maintain precise rib height, pitch, and uniformity across the full tube length.
Yes. Materials such as SA213 T2 (Cr-Mo alloy steel) offer excellent creep resistance and oxidation resistance, making them suitable for prolonged exposure above 500°C.
All tubes undergo controlled atmosphere processing and protective gas treatment to prevent oxidation and contamination, ensuring clean internal surfaces critical for heat exchange efficiency.
- ASTM: ASTM A210 / ASTM A213
- EN: EN 10216-2
- GOST: GOST 8732 / 8734
- JIS: JIS G3461 / G3462
- GB: GB/T 3087 / GB/T 5310
Boiler Evaporator Tubes in Thermal Power Plants
| Grade | C | Mn | Si | Cr | Mo |
|---|---|---|---|---|---|
| 20G | 0.17-0.23 | 0.35-0.65 | 0.17-0.37 | -- | -- |
| SA210 A1 | ≤0.27 | ≤0.93 | ≥0.10 | -- | -- |
| SA210 C | ≤0.35 | 0.29-1.06 | ≥0.10 | -- | -- |
| SA213 T2 | 0.10-0.20 | 0.30-0.61 | 0.10-0.30 | 0.51-0.81 | 0.44-0.65 |
| 15CrMoG | 0.12-0.18 | 0.40-0.70 | 0.17-0.37 | 0.80-1.10 | 0.40-0.55 |
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|
| 20G | 410-550 | ≥245 | ≥24 | -- |
| SA210 A1 | ≥415 | ≥255 | ≥30 | ≤143 HBW |
| SA210 C | ≥485 | ≥275 | ≥30 | ≤179 HBW |
| SA213 T2 | ≥415 | ≥205 | ≥30 | ≤163 HRW |
| 15CrMoG | 440-640 | ≥235 | ≥21 | -- |
Manufacturer, also can do trading.
Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, according to quantity.
Yes, we could offer the sample for free charge but need pay the cost of freight.
Payment ≤ 2000 USD, 100% in advance. Payment ≥ 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
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