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UNS S31803 tube, also known as S31803 duplex stainless steel tube, possesses a microstructure consisting of equal amounts of austenite and ferrite phases. It is widely acclaimed for its exceptional corrosion resistance and high strength, making it suitable for various demanding environments. Notably, it demonstrates remarkable performance in settings with elevated temperatures, pressures, and chloride levels. As a result, it has become a popular choice in industries such as oil and gas, chemical processing, and marine. This versatile tube finds utility in numerous applications, including heat exchangers, boilers, pressure vessels, and piping systems.
- ASTM A790 is a standard specification that outlines the requirements for seamless and welded ferritic/austenitic stainless steel pipes. This specification is widely used in the industry to ensure the quality and reliability of these pipes.
The main purpose of ASTM A790 is to provide guidelines for the manufacturing and testing of ferritic/austenitic stainless steel pipes. By following this standard, manufacturers can ensure that their products meet certain criteria and specifications.
The seamless and welded ferritic/austenitic stainless steel pipes covered by ASTM A790 are used in various applications, including oil and gas exploration, chemical processing, and power generation. These pipes are known for their excellent corrosion resistance, high strength, and good formability.
ASTM A790 specifies the dimensions, material requirements, mechanical properties, and testing procedures for these pipes. It provides detailed guidelines for the chemical composition of the steel, as well as the acceptable levels of various elements and impurities.
In addition to the chemical composition, ASTM A790 also defines the heat treatment process for the ferritic/austenitic stainless steel pipes. This ensures that the pipes have the desired microstructure and mechanical properties.
To ensure the quality of the pipes, ASTM A790 requires various tests to be performed, including tensile tests, hardness tests, and impact tests. These tests help to assess the strength, toughness, and overall performance of the pipes.
Overall, ASTM A790 plays a vital role in ensuring the quality, reliability, and consistency of seamless and welded ferritic/austenitic stainless steel pipes. By following this standard, manufacturers can produce pipes that meet the industry requirements and offer optimal performance in various applications.
- General Service Stainless steel tubing is governed by ASTM A789, which provides a standard specification for both seamless and welded ferritic/austenitic stainless steel tubing. This specification is designed to ensure quality and consistency in the manufacturing process. The tubing is suitable for various general service applications where corrosion resistance and high mechanical properties are required. ASTM A789 serves as a guideline for manufacturers and users alike, establishing the necessary parameters for the production and use of stainless steel tubing in a wide range of industries. Compliance with this specification helps to guarantee the reliability and performance of the tubing in general service applications.
- The ASTM A928 stipulates the guidelines for the electric fusion welding of ferritic/austenitic (duplex) stainless steel pipes with filler metal. This standard ensures that the pipes are manufactured to meet specific quality standards, and that the welding process is carried out in a precise and controlled manner. The addition of filler metal helps to enhance the strength and durability of the pipe, making it suitable for use in a variety of industrial settings. Overall, this specification serves as an important benchmark for the manufacture of high-quality duplex stainless steel pipes.
ASTM A789 S31803 Tubing Specifications
| Specifications | ASTM A789 / ASME SA789 ASTM A790 / ASME SA790 |
| Seamless Tube | 1 / 2" NB – 8" NB |
| Welded Tube | 6” – 24” |
| Outer Diameter | 6.0mm – 630mm |
| Wall Thickness | 1mm – 50 mm |
| Schedules | There are several types of pipe schedule used in the industry, including SCH5, SCH20, SCH30, SCH40, STD, SCH60, SCH80, XS, SCH120, SCH140, SCH160, and XXS. Each schedule represents the thickness of the pipe wall and is used for different purposes depending on the specific application. It is important to choose the correct schedule based on the requirements of the project to ensure optimal performance and safety. So, understanding the differences between these schedules is crucial in selecting the right piping system for your project. |
| Length | Single Random, Double Random , Required Length |
| Packaging | I would like to discuss different types of packaging materials such as wooden pallets, wooden boxes, bundle materials, plastic cloth wraps, plastic end caps, and beveled protectors. Each of these items serves a unique purpose in providing secure and safe packaging solutions. Wooden pallets are commonly used for transportation and storage of goods. They are designed to withstand heavy loads and provide stability during handling and transportation. Additionally, wooden pallets can be easily stacked, ensuring efficient use of space. Wooden boxes are another reliable option for packaging. They are sturdy and provide excellent protection for fragile or valuable items. Wooden boxes can be customized to specific dimensions and can be equipped with additional features such as handles or locks. Bundle materials are a versatile packaging option, often used for securing multiple items together. These materials can include ropes, straps, or even plastic wraps. Bundling ensures items are kept organized and prevents any shifting or damage during transit. Plastic cloth wraps are commonly used for covering large or irregularly shaped objects. They provide a protective layer against dust, moisture, and other external elements. Plastic cloth wraps are lightweight and offer flexibility, making them suitable for various packaging needs. Plastic end caps are specifically designed to protect the edges of fragile items such as glass, mirrors, or paintings. They can be easily attached to the edges, providing cushioning and preventing any damage during handling or transportation. Lastly, beveled protectors are useful in providing extra protection for corners and edges. They are often made of durable materials such as plastic or foam and can be easily attached to prevent any chipping or scratching. In conclusion, the various packaging materials mentioned - including wooden pallets, wooden boxes, bundle materials, plastic cloth wraps, plastic end caps, and beveled protectors - offer different levels of protection and are suitable for a wide range of packaging needs. |
| Added Services | We offer a range of services including drawing, expansion, machining, sand blasting, shot blasting, and heat treatment. Our team is skilled in providing high-quality services in each of these areas. Whether you need parts drawn up for a new project or existing parts expanded to meet specific requirements, we can help. Our state-of-the-art machining equipment ensures precision and accuracy in every job we undertake. Sand blasting and shot blasting are both effective methods for cleaning, smoothing, and preparing surfaces for further treatment or finishing. Finally, our heat treatment services will improve the strength, durability, and overall performance of your components. Contact us today to learn more about our services and how we can help your business. |
| Testing | Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, Flare Test, Bend Test, Hardness Test, Tensile Test etc. |
ASME SA789 UNS S31803 Tube Corrosion Resistant
S31803 duplex stainless steel tube has excellent corrosion resistance, much higher than 316 grade. It resists localized corrosion types such as intergranular, crevice and pitting corrosion. The CPT of these stainless steels is approximately 35°C. This grade is resistant to chloride stress corrosion cracking (SCC) up to 150°C. F51 duplex tube stainless steel is a suitable replacement for austenitic stainless steel, especially in premature failure environments and marine environments.
Duplex Stainless Steel 1.4462 Tubes Heat Resistance
The high oxidation resistance of grade S31803 is compromised by its embrittlement above 300°C. This embrittlement can be reversed by full solution annealing. This grade performs well at temperatures below 300°C.
UNS S31803 Tube, Chemical Composition and Mechanical Properties
| Trade Name | UNS | Duplex Industry Specifications | Chemical Composition | Min.Tensile (KSI) |
Min.Yield (KSI) |
Elongation % |
| SAF 2205 | UNS S31803 | A789, A790, A928 | C : 0.30 max Cr : 21.0-23.0 Mn: 2.00 max Mo: 2.50-3.50 N : 0.08-0.20 Ni : 4.50-6.50 P : 0.030 max S : 0.020 max Si : 1.00 max |
90 | 65 | 25 |
Welding and Processing of ASME SA789 S31803 Duplex Welded Tubes
Most standard welding methods are suitable for this grade DIN 1.4462, with the exception of welding without the use of filler metal, which results in excessive ferrite. AS 1554.6 prequalifies the welding of 2205 and 2209 electrodes or electrodes so that the deposited metal has the correct equilibrium duplex structure. Due to its high strength, this grade has low machinability. Cutting speeds are nearly 20% lower than grade 304.
ASTM A789 UNS S31803 Tube Heat Treatment
The most suitable heat treatment for UNS S31803 is solution treatment (annealing) at temperatures between 1020 - 1100°C followed by rapid cooling. Grade 2205 can be work hardened but not heat hardened.
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