Duplex Stainless Steel Welded Pipes
Duplex steel welded pipe is made from two different types of stainless steel, also known as austenitic steel and ferritic steel. Duplex steel is a combination of two types of steel that offers greater strength, corrosion resistance, and better weldability than either steel alone. Duplex steel welded pipe is used in many industries, including the chemical, petrochemical, marine and food processing industries. They are used in a variety of applications including piping, pressure vessels, boilers, storage tanks and condensers. Duplex steel welded pipe is also used in the construction industry for a variety of purposes such as structural framing, piping systems, and other general manufacturing purposes.
Gnee Steel (Tianjin) Co., Ltd. is one of the most reliable manufacturers and suppliers of duplex stainless steel welded pipes in China, also supports customized service with low price. Welcome to wholesale discount duplex stainless steel welded pipes for sale here from our factory. Contact us for free sample.
Duplex stainless steel can generally be divided into four categories: the first type is low alloy type, representing the brand UNSS32304. The steel does not contain molybdenum, PREN: 24-25, and can be used instead of AISI304 or 316 in terms of stress corrosion resistance. The second type of medium alloy type represents the brand UNSS31803, PREN:32-33, and its corrosion resistance is between AISI316L and 6%MO+N austenitic stainless steel. The third type of high alloy type generally contains 25% CR, and also contains molybdenum and nitrogen, and some also contain copper and tungsten. The standard grade is UNSS32550, and PREN: 38-39 has higher corrosion resistance than 22% Cr duplex stainless steel. The fourth type of super duplex stainless steel contains high molybdenum and nitrogen. The standard grade is UNSS32750, and some also contain tungsten and copper. PREN>40 can be used in harsh media conditions. It has good corrosion resistance and mechanical properties. Comparable to super austenitic stainless steel. (Note: PREN: equivalent value of pitting resistance)
Chemical composition The main alloying elements of dual-phase steel are Cr, Ni, Mo and N. Among them, Cr and Mo increase the ferrite content, while Ni and N are austenite stabilizing elements. Some steel types also have elements such as Mn, Cu, and W. Cr, Ni, and Mo can improve corrosion resistance. Its resistance to pitting corrosion and crevice corrosion is particularly good in chloride-containing environments.
Mechanical Properties Table:
|
Material Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
|
UNS S31803 |
620 |
450 |
25 |
|
UNS S32205 |
655 |
485 |
25 |
|
UNS S32750 |
800 |
550 |
15 |
|
UNS S32760 |
750 |
550 |
25 |
Product Notes
When using duplex stainless steel welded pipe, it is important to consider the following.
Avoid exposure to high temperatures, which can lead to stress corrosion cracking.
Choose a suitable welding process to avoid material embrittlement.
Avoid use in highly acidic or highly alkaline environments.
Production equipment and procedures
Our factory uses advanced production equipment, including TIG welding machines, to ensure high quality products. Our production process includes.
Material selection and inspection
Pipe cutting and forming
Welding
Heat treatment
Inspection and testing
Production advantages
Our factory has several advantages in the production of duplex stainless steel welded pipes, including.
Experienced engineers and technicians
Advanced production equipment
Strict quality control measures
Customized production options
Our Team
Customer Visit
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