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.
Structure
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.
- Q:What is the difference between seamless and spiral welded stainless steel pipes?
- The main difference between seamless and spiral welded stainless steel pipes lies in their manufacturing process. Seamless pipes are formed by piercing a solid billet of stainless steel and then rolling it into a pipe shape, resulting in a continuous and uniform structure. On the other hand, spiral welded pipes are made by rolling a coil of stainless steel into a spiral shape and welding the edges together. This creates a noticeable weld seam along the length of the pipe. While seamless pipes are generally considered to have superior strength and aesthetic appeal due to their uninterrupted structure, spiral welded pipes are often more cost-effective and suitable for applications requiring larger diameters.
- Q:Are stainless steel pipes resistant to sulfide stress corrosion cracking?
- Generally, stainless steel pipes exhibit resistance to sulfide stress corrosion cracking (SSC). This is due to the high chromium content in stainless steel, which leads to the formation of a protective oxide layer on the material's surface. This oxide layer acts as a barrier against corrosive substances, including sulfides, preventing their penetration into the steel. Furthermore, stainless steel pipes are often alloyed with other elements such as molybdenum and nickel, which further enhance their corrosion resistance. However, it is crucial to note that the degree of resistance to SSC can vary based on the specific grade and composition of stainless steel utilized. Consequently, it is vital to select the appropriate stainless steel grade specifically designed to withstand sulfide stress corrosion cracking in the desired application.
- Q:What is the maximum pressure that stainless steel pipes can handle?
- The maximum pressure that stainless steel pipes can handle depends on various factors such as the grade of stainless steel, pipe thickness, and diameter. Generally, stainless steel pipes are capable of handling high pressures ranging from a few hundred to several thousand pounds per square inch (psi). It is crucial to consult industry standards, specifications, and engineering guidelines to determine the exact maximum pressure capacity for a specific stainless steel pipe.
- Q:Stainless steel pipe welding interface leakage, how can we not leak?
- Only when the welding quality is improved and the welding defects are reduced can the welding seam position be watertight:Argon arc welding is preferred for stainless steel pipe welding. When the wall thickness is thicker, the backing argon arc welding shall be used preferentially, and the filling and cover surface shall be welded by manual arc welding;The cleaning work before welding should be done well, and all the defects such as burr, oil stain, dust and spot welding should be removed;
- Q:Can stainless steel pipes be used for pharmaceutical industries?
- Indeed, stainless steel pipes find utility within the pharmaceutical industries. Owing to its exceptional resistance to corrosion, durability, and hygienic qualities, stainless steel is widely employed in this sector. Its ability to withstand chemicals, high temperatures, and moisture renders it suitable for diverse applications throughout the pharmaceutical manufacturing processes. Stainless steel pipes frequently serve the purposes of conveying and preserving pharmaceutical products, as well as facilitating the distribution of purified water, steam, and other fluids. Moreover, stainless steel is easily cleaned and maintained, a vital aspect in guaranteeing the cleanliness and sterility mandated in pharmaceutical facilities.
- Q:Are stainless steel pipes suitable for mining applications?
- Yes, stainless steel pipes are suitable for mining applications due to their excellent corrosion resistance, high strength, and durability. They can withstand harsh environments, extreme temperatures, and the corrosive nature of mining fluids, making them ideal for transporting and distributing various materials in the mining industry.
- Q:How can the inner walls of stainless steel tubes be polished?
- 1) (used in polishing the inner surface polishing machine): rod is thrown into the tube to drive the impeller 1000 or homemade abrasive wheel rotating speed, and with the rotation of the polishing pipe itself, while rotating slowly forward throwing rod. Generally speaking, first use the 60#-80# wheel of Chiba or abrasive belt wheel for rough throwing, and then gradually fine throwing with high precision according to the requirement of smoothness. Large size pipe 6, more than the general use of thousands of impeller, small size of the pipe can be made with homemade abrasive belt wheel, you can reduce costs.
- Q:Are stainless steel pipes suitable for chemical processing plants?
- 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.
- Q:What is the difference between 304 and 304H stainless steel pipes?
- The carbon content is the main factor distinguishing 304 and 304H stainless steel pipes. Both materials consist of iron, chromium, and nickel, but 304H stainless steel has a higher carbon content compared to 304 stainless steel. This increased carbon content in 304H enhances its strength and resistance to deformation at high temperatures, making it more suitable for applications involving elevated temperatures. The higher carbon content in 304H stainless steel pipes also improves their ability to resist sensitization during welding. Sensitization refers to the formation of chromium carbides at the grain boundaries, which can lead to intergranular corrosion and reduced mechanical properties. By incorporating a higher carbon content, 304H stainless steel pipes can effectively resist this sensitization phenomenon and maintain their structural integrity even at high temperatures. Both 304 and 304H stainless steel pipes exhibit excellent corrosion resistance, good weldability, and high strength. They find extensive use in various industries, including oil and gas, chemical, food processing, and pharmaceuticals. However, it is worth noting that 304H stainless steel pipes are typically recommended for applications requiring high-temperature strength, while 304 stainless steel pipes are more commonly used for general-purpose applications. In conclusion, the carbon content distinguishes 304 and 304H stainless steel pipes. 304H stainless steel pipes have a higher carbon content, which enhances their high-temperature strength and resistance to sensitization during welding. These differences should be taken into account when selecting the appropriate stainless steel pipe for a specific application.
- Q:Can stainless steel pipes be used for oil pipelines?
- Yes, stainless steel pipes can be used for oil pipelines. Stainless steel is known for its high resistance to corrosion and durability, which makes it suitable for transporting oil and other corrosive substances.
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Stainless steel pipe S31803
- Ref Price:
-
- Loading Port:
- Shanghai
- Payment Terms:
- TT OR LC
- Min Order Qty:
- -
- Supply Capability:
- 200000 kg/month
OKorder Service Pledge
OKorder Financial Service
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