Stainless steel pipe S31803

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S31803 dual phase stainless steel is composed of 21% chromium, 2.5% molybdenum and nickel nitrogen form 4.5% duplex stainless steel alloy. It has high strength, good toughness and good overall and local stress corrosion resistance. The yield strength of S31803 duplex stainless steel is two times that of austenitic stainless steel, this feature enables designers to reduce weight in the design of products, let this alloy has a price advantage than 316317L. This alloy is particularly applicable to -50 degrees F/+600 degrees F temperature range. Beyond this temperature range of applications, also can consider this kind of alloy, but there are some limitations, especially when used in welding structure.

The characteristics of S31803 duplex stainless steel:

1.S31803 dual phase stainless steel and austenitic stainless steel 316L and 317L compared, S31803 properties of dual phase steel in the resistance to pitting and crevice corrosion is more superior, it has very high corrosion resistance of austenite, and compared, its lower thermal expansion coefficient, high thermal conductivity.

2.S31803 dual phase stainless steel and austenitic stainless steel are compared, the compressive strength is two times, compared with 316L and 317L, the designer can reduce the weight. Alloy 2205 is particularly applicable to - 50 degrees F/+600 degrees F temperature range, in a strictly limited circumstances (especially for welding structure), can also be used to lower the temperature.

Chemical composition: C = 0.030, Mn = 2 Si = 1, P = 0.030 S = 0.020 Cr and 22 ~ 23 Ni and 4.5 ~ 6.5 Mo3.0 ~ 3.5 N0.14 ~ 0.20 (austenite and ferrite)

S31803 dual phase stainless steel applications:

Pressure vessels, pressure tanks, high pressure pipe, heat exchanger (chemical processing industry).

Petroleum natural gas pipeline, the heat exchanger tubes.

And the sewage treatment system.

And the pulp and paper industry classifier, bleaching equipment, storage and processing system.

High strength corrosion environment of the rotary shaft, impeller blades, press roller, etc..

Cargo tank, ship or truck

And food processing equipment

S31803 dual phase stainless steel standard:

ASTM/ASME..A240 UNS S32205/S31803...

EURONORM..1.4462 X2CrNiMoN 22.5.3...

AFNOR....Z3 CrNi 22.05 AZ

DIN....W. Nr 1.4462

S31803 dual phase stainless steel corrosion resistance:

Uniform corrosion

Because the chromium content (22%), Mo (3%) and nitrogen content (0.18%), 2205 of the properties of corrosion resistance is better than that of 316L and 317L in most environments.

Local corrosion

The content of chromium, molybdenum and nitrogen S31803 duplex stainless steel in the oxidizing and acidic solution, has a strong ability to resist corrosion and crevice corrosion.

Stress corrosion resistance

Dual phase microstructure of stainless steel is helpful to improve the resistance of the stainless steel stress corrosion cracking ability. At a certain temperature, oxygen tension exists, and the absence of chloride, austenitic stainless steel will happen to chloride stress corrosion. Because of these conditions is not easy to control, so the use of 304L, 316L and 317L are limited in this respect.

Corrosion fatigue

High strength and corrosion resistance of S31803 duplex stainless steel which has high resistance to corrosion fatigue strength. Processing equipment susceptible to corrosion environment and cyclic loading, the characteristics of S31803 duplex stainless steel is very suitable for such applications.


Chemical composition of S31803 duplex stainless steel after 1900 degrees /1922 degrees F (1040 degrees /1080 degrees C) solution annealed microstructure can obtain ideal 50 alpha / 50 gamma. If the heat treatment temperatures above 2000 degrees F, may lead to an increase in the ferrite components. Like other dual phase stainless steel, alloy 2205 is easily affected by the intermetallic phase precipitation. Intermetallic phases at 1300 DEG F and 1800 DEG between F at 1600 DEG F precipitation, temperature, the precipitation of the fastest. Therefore, we need to conduct experiments on the S31803 duplex stainless steel, to ensure that no intermetallic phase, testing, reference ASTM A 923.

S31803 dual phase stainless steel processing

Hot forming

We suggest that should be carried out in the following 600 degrees F temperature forming. In hot forming processing, the workpiece should be heated, should be in 1750 degrees F to 2250 degrees F within the temperature range of 2205 alloy under this temperature, very soft. If the temperature is too high, easy to hot tearing 2205 alloy. Below this temperature, the austenite will be broken. Below 1700 degrees F, because of the influence of temperature and deformation, intermetallic will soon form. After hot forming, should be an immediate solution annealed to at least 1900 degrees F temperature, and quenching to restore its phase equilibrium, toughness and corrosion resistance. We do not recommend eliminating stress, but if you must do so, materials to be solution annealed at a minimum of 1900 degrees F temperatures, then rapidly cooling, water quenching.

Cold forming

S31803 dual phase stainless steel can be cut and cold forming. However, due to the high strength and hardness of 2205 alloy itself, it than austenitic steel is more need for cold forming, also because of its high strength, should give full consideration to the factors of springback.

There are several types of stainless steel pipe coatings that are used to enhance the durability, corrosion resistance, and aesthetic appearance of the pipes. Some of the common types of stainless steel pipe coatings include: 1. Fusion Bonded Epoxy (FBE) Coating: FBE coating is a thermosetting resin-based coating that is applied to the pipes using an electrostatic spray. It provides excellent corrosion resistance and adhesion, making it suitable for both buried and above-ground applications. 2. Polyethylene (PE) Coating: PE coating is a thermoplastic coating that is applied to the pipes using extrusion. It provides high impact resistance and excellent resistance to chemical substances, making it suitable for pipes used in harsh environments. 3. Polypropylene (PP) Coating: PP coating is a thermoplastic coating similar to PE coating but with higher temperature resistance. It is often used for pipes that transport high-temperature fluids. 4. Polyurethane (PU) Coating: PU coating is a thermosetting resin-based coating that is applied to the pipes using a spray or dip method. It provides excellent resistance to abrasion, impact, and chemicals, making it suitable for pipes used in demanding applications. 5. Zinc Coating: Zinc coating, also known as galvanization, is a metallic coating that is applied to the pipes using a hot-dip process. It provides excellent corrosion resistance and is commonly used for pipes used in outdoor and underground applications. 6. Ceramic Coating: Ceramic coating is a high-temperature resistant coating that is applied to the pipes using a thermal spray process. It provides excellent resistance to abrasion, oxidation, and corrosion, making it suitable for pipes used in high-temperature environments. 7. PTFE (Polytetrafluoroethylene) Coating: PTFE coating is a non-stick coating that is applied to the pipes using a spray or dip method. It provides excellent resistance to chemicals and high temperatures, making it suitable for pipes used in the chemical and food industries. These are just a few examples of the different types of stainless steel pipe coatings available. The choice of coating depends on the specific requirements of the application, such as the type of fluid being transported, the operating temperature and pressure, and the environmental conditions.
Pipe making is the process by which stainless steel pipes are manufactured. This process consists of several steps that guarantee the creation of stainless steel pipes that are both durable and of high quality. The initial step in the manufacturing of stainless steel pipes involves the selection of raw materials. Stainless steel, which is a mixture of iron, chromium, and other elements, is chosen for its ability to resist corrosion. The specific grade and composition of stainless steel are carefully chosen based on the intended purpose of the pipe. Once the raw materials have been chosen, they are melted in a furnace using the electric arc furnace process. This process involves heating the stainless steel to extremely high temperatures, usually around 1700 degrees Celsius, until it becomes molten metal. Once the molten metal has been formed, it is transferred to a continuous casting machine, which shapes it into a solid cylindrical shape known as a billet. The billet is then taken to a rolling mill where it is shaped into a seamless pipe. The rolling mill consists of multiple stands that gradually decrease the thickness and diameter of the billet. The billet is passed through these stands multiple times, with each pass reducing its size further. This continuous rolling process ensures that the stainless steel pipe is consistent and uniform. Once the desired size has been achieved, the pipe is cut to the necessary length using saws or other cutting tools. The ends of the pipe are then prepared for welding or other joining methods. In some cases, additional processes such as heat treatment or surface finishing may be applied to the stainless steel pipes. Heat treatment helps improve the mechanical properties of the pipe, while surface finishing can enhance its aesthetics or resistance to corrosion. Finally, the stainless steel pipes undergo quality inspection to ensure that they meet industry standards. This may include various testing methods such as visual inspection, measurement of dimensions and wall thickness, non-destructive testing, and chemical analysis. In conclusion, the manufacturing of stainless steel pipes involves a series of processes including melting, casting, rolling, cutting, and inspection. These processes guarantee the production of stainless steel pipes that are of high quality and suitable for a wide range of applications, including plumbing, construction, and industrial uses.
The main difference between 304LN and 304 stainless steel pipes lies in their chemical composition and mechanical properties. 304LN stainless steel is a nitrogen-strengthened version of 304 stainless steel. The addition of nitrogen improves its strength and resistance to corrosion, making it suitable for various applications in industries such as food processing, chemical processing, and pharmaceuticals. The nitrogen content in 304LN stainless steel is typically higher than that in standard 304 stainless steel, which enhances its overall performance. On the other hand, 304 stainless steel is a widely used austenitic stainless steel grade known for its excellent corrosion resistance, high-temperature strength, and ease of fabrication. It is commonly used in applications such as kitchen appliances, automotive parts, and architectural components. In terms of mechanical properties, 304LN stainless steel generally exhibits higher tensile and yield strength compared to 304 stainless steel. This makes it more suitable for applications that require increased strength or resistance to deformation. However, it is important to note that the specific mechanical properties may vary depending on the manufacturing process and heat treatment of the stainless steel pipes. In summary, the key difference between 304LN and 304 stainless steel pipes lies in their nitrogen content and resulting mechanical properties. While 304 stainless steel is a versatile and corrosion-resistant grade, 304LN stainless steel offers improved strength and corrosion resistance due to the addition of nitrogen. The choice between the two grades depends on the specific application requirements and the desired combination of properties.
Stainless steel pipe is a type of pipe made from an alloy of steel and chromium, with a high resistance to corrosion and staining. It is commonly used in various industries, including construction, automotive, and manufacturing, due to its durability and ability to withstand harsh environments.
Yes, stainless steel pipes are generally resistant to crevice corrosion. Due to their composition, which includes a significant amount of chromium, stainless steel pipes form a protective oxide layer that prevents the formation of crevices and minimizes the risk of crevice corrosion. However, the resistance to crevice corrosion may vary depending on the specific grade of stainless steel and the environmental conditions in which the pipes are used.
Indeed, pharmaceutical processing equipment can utilize stainless steel pipes. The pharmaceutical industry highly favors stainless steel as it boasts exceptional resistance to corrosion, long-lasting durability, and effortless cleaning. Its ability to withstand chemicals, corrosion, and high temperatures renders it suitable for the manipulation and conveyance of a diverse range of pharmaceutical substances. Furthermore, stainless steel pipes possess a sleek surface that diminishes the likelihood of contamination and facilitates effortless cleansing and sterilization. In conclusion, stainless steel pipes find extensive use in pharmaceutical processing equipment, guaranteeing the integrity and excellence of pharmaceutical products.
The typical wall thickness of stainless steel pipes can vary depending on the specific application and industry requirements. However, it is common to find stainless steel pipes with wall thickness ranging from 0.065 inches (1.65 mm) to 0.250 inches (6.35 mm).
304J4 and 316J4 stainless steel pipes exhibit contrasting compositions and properties. In terms of their alloy content, 304J4 stainless steel comprises 18-20% chromium and 8-10% nickel, whereas 316J4 stainless steel consists of 16-18% chromium, 10-14% nickel, and 2-3% molybdenum. The elevated levels of nickel and molybdenum in 316J4 stainless steel pipes contribute to their superior resistance against corrosion compared to 304J4 stainless steel pipes. This characteristic renders 316J4 stainless steel pipes more suitable for applications exposed to harsh environments, including marine and chemical industries. Moreover, the increased molybdenum content in 316J4 stainless steel pipes enhances their ability to withstand pitting and crevice corrosion, which commonly occur in chloride-rich surroundings. Consequently, they are the preferred choice for applications involving exposure to seawater or other corrosive substances. Conversely, 304J4 stainless steel pipes offer a more cost-effective option and are frequently employed in less demanding applications, where corrosion resistance is not a primary concern. They find wide usage in industries such as food processing, appliances, and automotive. In conclusion, the fundamental disparities between 304J4 and 316J4 stainless steel pipes lie in their alloy composition and subsequent corrosion resistance properties. 316J4 stainless steel pipes exhibit heightened corrosion resistance, particularly in chloride-rich environments, making them well-suited for more demanding applications, while 304J4 stainless steel pipes present a cost-effective solution and are commonly utilized in less corrosive environments.
Chemical processing plants find stainless steel pipes highly suitable. Their excellent corrosion resistance properties make them an ideal choice for handling various chemicals and corrosive substances. They can resist both organic and inorganic chemicals, acids, and alkalis, ensuring the pipes' integrity and longevity in harsh chemical environments. Furthermore, stainless steel pipes offer high strength and durability, enabling them to withstand the high pressures and temperatures commonly found in chemical processing plants. They exhibit excellent heat resistance, which is crucial for handling hot fluids and maintaining chemical process stability. In addition, stainless steel pipes have low maintenance requirements and are easy to clean, reducing contamination risks and ensuring chemical purity. They are also resistant to scaling, which can affect plant operations' efficiency. Moreover, stainless steel pipes are non-reactive, meaning they do not leach or contaminate the transported chemicals. This quality is particularly important in chemical processing plants where product purity and quality are paramount. All in all, stainless steel pipes provide a reliable and efficient solution for chemical processing plants due to their exceptional corrosion resistance, strength, durability, heat resistance, and non-reactivity.
Yes, stainless steel pipes can be used for heat exchangers. Stainless steel is a popular choice for heat exchangers due to its excellent corrosion resistance, high temperature resistance, and durability. It can withstand high pressure and temperature variations, making it suitable for various heat exchange applications. Stainless steel pipes also have good thermal conductivity, allowing for efficient heat transfer. Additionally, stainless steel is easy to clean and maintain, making it a reliable and long-lasting option for heat exchangers in various industries such as chemical, pharmaceutical, food processing, and HVAC.

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