There is a wide use of UNS S32205 pipes in the Philippines. Similarly, S31803 duplex pipes are part of many industries all over the world. Vishal Tube is one of the most renowned duplex pipe suppliers in the Philippines. We have a thorough knowledge of the metallurgy sector and the Philippine industry. Based on this knowledge, we have created the S32205 and S31803 guide, which will help you understand why the oil and gas, maritime, and chemical processing sectors of the Philippines are in favor of the use of UNS S32205 and S31803 duplex stainless steel in the Philippines.
What is the UNS S32205 pipe?
The UNS S32205 grade is also called ASTM A790 or UNS S32205. It is a duplex stainless steel pipe with better rust resistance. It also has higher yield and tensile strength. It is also a steel with better weldability.
What are the sizes of UNS S32205 pipes in the Philippines?
| Typical Size Examples of UNS S32205 pipe | ||
|---|---|---|
| Nominal Pipe Size (NPS) | Outside Diameter (mm) | Common Schedules Available |
| 1/2″ | 21.3 mm | Sch 10 – Sch 160 |
| 1″ | 33.4 mm | Sch 10 – Sch 160 |
| 2″ | 60.3 mm | Sch 10 – Sch 160 |
| 4″ | 114.3 mm | Sch 10 – Sch 160 |
| 6″ | 168.3 mm | Sch 10 – Sch 160 |
| 8″ | 219.1 mm | Sch 10 – Sch 160 |
| 10″ | 273.1 mm | Sch 10 – Sch 160 |
| 12″ | 323.9 mm | Sch 10 – Sch 160 |
What are the dimensions of UNS S32205 pipes in the Philippines?
| NPS | Outside Diameter |
| 1/2″ | 21.3 mm (0.84 in) |
| 1″ | 33.4 mm (1.315 in) |
| 2″ | 60.3 mm (2.375 in) |
| 4″ | 114.3 mm (4.5 in) |
| 6″ | 168.3 mm (6.625 in) |
| 8″ | 219.1 mm (8.625 in) |
| 10″ | 273.1 mm (10.75 in) |
| 12″ | 323.9 mm (12.75 in) |
How are UNS S32205 pipes one of the best alternatives for Philippine industries?
The Philippines’ humid, salty environment is extremely corrosive to metals. Moreover, it has more than 36,000 kilometers. The refineries in the Philippines experience stress corrosion cracking because of constant seawater exposure. They also have chloride-rich environments.
- S32205 is resistant to pitting and crevice corrosion because of high levels of chromium, molybdenum, and nitrogen.
- When you compare S32005 to carbon steel or other common stainless steels like 304/305, you will find out that this steel has a longer service life and there are fewer maintenance and replacement costs.
- The S32005 has a superior level of sturdiness for demanding industrial uses.
- It has a lower total system weight, which is crucial for the following:
- Chemical plants
- Shipyards
- Offshore platforms.
- S32005 reduces the chance of pipe failure by handling high-pressure and high-temperature systems.
What is the UNS S31803 pipe?
It is Duplex stainless steel. It is also known as 2205 Duplex stainless steel in the Philippines and all over the world.
It has the following characteristic:
- High-performing alloy pipe
- Consists of an equal mixture of ferritic and austenitic microstructures
What is the chemical composition of UNS S31803 Duplex pipe?
| Element | Weight % (Typical Range) |
| Chromium | 21.0 – 23.0% |
| Nickel | 4.5 – 6.5% |
| Molybdenum | 2.5 – 3.5% |
| Manganese | ≤ 2.0% |
| Silicon | ≤ 1.0% |
| Nitrogen | 0.08 – 0.20% |
| Carbon | ≤ 0.030% |
| Phosphorus | ≤ 0.030% |
| Sulfur | ≤ 0.020% |
| Iron | Balance |
What are the sizes of UNS S31803 pipe?
| Specification | Range |
| Outside Diameter | ½” to 24″ |
| Wall Thickness (WT) | SCH 10S to SCH 160 or XXS |
| Length | 6 m , 12 m , or custom cut-to-length |
| Form | Seamless or Welded |
What are the dimensions of UNS S31803 Duplex Pipes?
| NPS | OD (in) | SCH 10S (in) | SCH 40S (in) | SCH 80S (in) |
| ½” | 0.84 | 0.083 | 0.109 | 0.147 |
| 1” | 1.315 | 0.109 | 0.133 | 0.179 |
| 2” | 2.375 | 0.154 | 0.154 | 0.218 |
| 4” | 4.5 | 0.237 | 0.237 | 0.337 |
| 6” | 6.625 | 0.28 | 0.28 | 0.432 |
| 8” | 8.625 | 0.322 | 0.322 | 0.5 |
| 10” | 10.75 | 0.365 | 0.365 | 0.593 |
| 12” | 12.75 | 0.375 | 0.375 | 0.687 |
How are UNS S31803 Duplex pipes one of the best alternatives for Philippine industries?
- Outstanding Resistance to Corrosion in Coastal and Marine Regions
The makeup of the Philippines is such that there are more than 7600 islands, and the industries are concentrated close to the coast. Therefore, they are constantly exposed to the saline waters of the seas.
The duplex pipe suppliers in the Philippines supply S31803 duplex pipes because UNS S31803 exhibits superior resistance to pitting, crevice corrosion, and stress corrosion cracking due to its high chromium , molybdenum , and nitrogen concentration.
- Great Strength when Losing Weight
The yield strength of S31803 duplex pipes is almost double when compared to the regular austenitic stainless steels. They can be made with thinner wall sections without sacrificing durability. This lowers the material weight and the cost without the sacrifice of safety in industries and construction sites, and the applications in which they are integrated.
- Excellent Performance in Warm and Humid Environments
Conventional steels corrode more quickly in the Philippines because of high humidity.
UNS S318803 pipes have a duplex structure that is the best for the following:
- Chemical plants
- Sugar mills
- Food processing plants
This is because it provides a balanced resistance to both localized and general corrosion, even when the exposure to salinity, humidity, and heat is high.
- Relevant use in Energy, Gas, and Oil Infrastructure
The pipelines and risers in the offshore oil and gas operations in the Palawan, Mindoro, and Sulu Seas have to withstand high-pressure flow and humidity, and salinity.
The weldability of UNS S31803 Duplex pipes offers consistent construction for refineries, LNG facilities, and offshore rigs. Therefore, duplex pipe suppliers in the Philippines supply this grade.
- Cost-effective Throughout the Lifecycle
UNS S31803 duplex pipes are more expensive initially than carbon steel, but replacement and repair expenses are decreased by their longer service life and less upkeep. In sectors where every shutdown is costly, such as mining, pulp & paper, and power generation, it also minimizes downtime.
Conclusion
Due to the harsh industrial and coastal circumstances in the Philippines. Duplex stainless steel
offers the ideal combination of strength, corrosion resistance, and long-term cost-effectiveness. UNS S32205 pipes in the Philippines are used in the manufacturing, chemical, oil and gas, and marine industries. In the same way, S31803 duplex pipes also guarantee longevity and peak performance. By selecting these duplex grades, enterprises may lower maintenance and repair costs while securing dependable infrastructure that can endure the severe environment of the nation.
Vishal Tube is the leading duplex pipe supplier in the Philippines. We are a distributor of quality UNS S32205 and S31803, and we have a variety of grades in stock that can enhance the operations and performance. They are available in various diameters and sizes and can even be customized as per your needs.