Duplex Steel S31803 Fin Tubes, Duplex Steel 31803 Fin Tubes, 31803 Duplex Steel Fin Tube Manufacturer, Duplex Steel 31803 Fin Tube Supplier, Duplex Steel 31803 Fin Tube Exporter, Duplex Steel 31803 Precision Tubing, Duplex Steel 31803 Small Diameter Tube ,Duplex Steel 31803 Fin Tubes
Duplex Steel S31803 Fin Tubes are widely utilized in industries that demand superior strength and corrosion resistance. These tubes are made from a duplex stainless steel grade known as UNS S31803, which combines the beneficial properties of austenitic and ferritic stainless steels. This unique microstructure provides enhanced mechanical strength and excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, making them ideal for harsh environments, particularly in chemical processing, marine, and oil & gas industries.
The finning process in these tubes involves the addition of external fins to the tube surface, which significantly increases the surface area. This allows for better heat transfer efficiency in heat exchangers and boilers. Fin tubes are especially important where space is limited but high thermal performance is required. Duplex S31803's excellent thermal conductivity, when combined with fins, results in highly efficient thermal transfer with prolonged operational life.
One of the most significant advantages of Duplex Steel S31803 Fin Tubes is their corrosion resistance. They are particularly effective in chloride-rich environments, where traditional stainless steels may fail. This makes them suitable for offshore and coastal facilities, desalination plants, and paper & pulp industries. The duplex structure also provides good weldability and fabricability, further enhancing its usability across applications.
In terms of mechanical properties, S31803 offers nearly twice the yield strength of standard austenitic stainless steels like 304 or 316. This allows for thinner tube walls without compromising strength, which can reduce weight and cost in large-scale systems. The tubes maintain their integrity under high-pressure and high-temperature conditions, making them a reliable choice for demanding industrial setups.
Specification of Duplex Steel S31803 Fin Tubes
| Specification | Details |
|---|---|
| Material Grade | Duplex Stainless Steel UNS S31803 / 1.4462 |
| Standards | ASTM A789 / ASTM A790 / ASME SA789 / SA790 |
| Tube Type | Seamless / Welded / Fin Tubes |
| Fin Type | Extruded, L-type, G-type, LL-type, KL-type, Embedded |
| Outer Diameter (OD) | 12 mm to 50.8 mm (custom sizes available) |
| Wall Thickness | 0.5 mm to 3.0 mm |
| Tube Length | Up to 24 meters (custom lengths on request) |
| Fin Height | 5 mm to 15 mm (depending on design and requirement) |
| Fin Density | Up to 10–12 fins per inch (FPI) |
| Fin Material | Same as base tube (Duplex S31803), Aluminum, or Copper (if specified) |
| Operating Temperature Range | -50°C to +300°C |
| Tensile Strength | ≥ 620 MPa |
| Yield Strength (0.2% Proof) | ≥ 450 MPa |
| Elongation | ≥ 25% |
| Hardness (HRB) | ≤ 100 |
| Corrosion Resistance | Excellent resistance to pitting, crevice, and stress corrosion cracking |
| Applications | Heat exchangers, condensers, oil & gas, chemical plants, marine environments |
Overall, Duplex Steel S31803 Fin Tubes represent a high-performance solution in heat exchanger technology, combining durability, corrosion resistance, and thermal efficiency. Their adaptability across various aggressive and high-stress environments ensures long-term performance and minimal maintenance, delivering both technical and economic benefits to operators and engineers.
Chemical Composition of Duplex Steel S31803 Fin Tubes
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| Chromium (Cr) | 21.0 | 23.0 |
| Nickel (Ni) | 4.5 | 6.5 |
| Molybdenum (Mo) | 2.5 | 3.5 |
| Manganese (Mn) | — | 2.0 |
| Silicon (Si) | — | 1.0 |
| Carbon (C) | — | 0.030 |
| Phosphorus (P) | — | 0.030 |
| Sulfur (S) | — | 0.020 |
| Nitrogen (N) | 0.08 | 0.20 |
| Iron (Fe) | Balance | Balance |
With a proven track record as a Duplex Steel S31803 Fin Tubes exporter in over 30 countries, Sumer Metal Industries ensures global availability, third-party inspection support, and client-specific customization. Our wide export network combined with strict quality standards has made us a preferred choice for SS 31803 tubing worldwide.
Specification of Duplex Steel S31803 Fin Tubes
| Specification | Details |
|---|---|
| Material Grade | Duplex Stainless Steel UNS S31803 / 1.4462 |
| Standards | ASTM A789 / ASTM A790 / ASME SA789 / SA790 |
| Tube Type | Seamless / Welded / Fin Tubes |
| Fin Type | Extruded, L-type, G-type, LL-type, KL-type, Embedded |
| Outer Diameter (OD) | 12 mm to 50.8 mm (custom sizes available) |
| Wall Thickness | 0.5 mm to 3.0 mm |
| Tube Length | Up to 24 meters (custom lengths on request) |
| Fin Height | 5 mm to 15 mm (depending on design and requirement) |
| Fin Density | Up to 10–12 fins per inch (FPI) |
| Fin Material | Same as base tube (Duplex S31803), Aluminum, or Copper (if specified) |
| Operating Temperature Range | -50°C to +300°C |
| Tensile Strength | ≥ 620 MPa |
| Yield Strength (0.2% Proof) | ≥ 450 MPa |
| Elongation | ≥ 25% |
| Hardness (HRB) | ≤ 100 |
| Corrosion Resistance | Excellent resistance to pitting, crevice, and stress corrosion cracking |
| Applications | Heat exchangers, condensers, oil & gas, chemical plants, marine environments |
🏭 Industry & Application
- ✅ Duplex Steel S31803 Fin Tubes for Medical Industry
- ✅ Duplex Steel S31803 Fin Tubes for Chemical Processing
- ✅ Duplex Steel S31803 Tubes for Fin Lines
- ✅ Duplex Steel S31803 Fin Tubes for Gas & Liquid Flow
- ✅ Duplex Steel S31803 Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1:What is Duplex Steel S31803, and why is it used in fin tubes?
Duplex Steel S31803 is a type of stainless steel that has a mixed microstructure of austenite and ferrite. This provides it with excellent mechanical strength and superior resistance to corrosion, especially stress corrosion cracking and pitting. It is ideal for fin tubes because it maintains strength and performance in aggressive and high-temperature environments, such as in chemical processing, offshore, and heat exchanger applications.
Q2: Are Duplex S31803 fin tubes resistant to seawater corrosion?
Yes. Duplex S31803 has excellent resistance to seawater and chloride-induced corrosion, making it ideal for marine environments and offshore oil & gas applications. Its duplex structure helps it withstand pitting and crevice corrosion, which are common problems in such conditions.
Q3:What are the advantages of using fin tubes made from Duplex S31803?
High thermal efficiency due to increased surface area from fins Excellent corrosion resistance in chloride-containing environments High mechanical strength (almost double that of austenitic stainless steel) Good weldability and formability Longer service life, reducing maintenance costs
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At Sumer Metal Industries Pvt. Ltd., we follow a zero-defect policy by implementing stringent quality checks, using certified raw materials, and continuously improving our processes to deliver reliable and consistent tubing solutions
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