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321 stainless steel tube

321 stainless steel tube

321 stainless steel is an austenitic stainless steel alloy that contains approximately 17-19% chromium and 9-12% nickel. It is further stabilized with the addition of titanium, which aids in preventing intergranular corrosion.The titanium content in 321 stainless steel provides significant benefits. It forms stable titanium carbides, which prevent chromium carbide precipitation along the grain boundaries, thus enhancing resistance to intergranular corrosion. This property makes it suitable for applications in environments with high temperatures and exposure to corrosive substances.Additionally, 321 stainless steel exhibits excellent general corrosion resistance, making it highly resistant to various corrosive agents such as organic and inorganic acids.

Standards and Specifications

STANDARDS
OD
WT
STANDARDS
OD
WT
mm
inch
mm
ga
ASTM A554
8-323
0.315"-12 3/4"
0.6-6.0
24ga-4ga
ASTM 249/269
15.88-203.2
0.6252"-8"
0.6-3.0
24ga-11ga
ASTM A270
15.88-203.2
0.6252"-8"
1.0-3.0
20ga-11ga
EN 10296-2
8-323
0.315"-12 3/4"
0.6-6.0
24ga-4ga
EN 10217-7
12-323
0.4724"-12 3/4"
0.6-6.0
24ga-4ga
EN 10357
13-204
0.5118"-8"
1.0-3.0
20ga-11ga

CHEMICAL COMPOSITION &
MECHANICAL PROPERTIES

321 CHEMICAL COMPOSITION & MECHANICAL PROPERTIES

Typical Chemical Composition % (max values, unless noted)
Grade
C
Mn
P
S
Si
Ni
Cr
Mo
321
0.08
2.0 max
0.04
0.03
1.00
9.0-13.0
17.0-20.0
Typical Mechanical Properties
Grade
Tensile Strength
Yield Strength
Elongation in 2 in. or (50mm)
Brinell Hardness
Rockwell Hardness
min
min
min
max
max
ksi
Mpa
ksi
Mpa
%
321
75
517
30
207
35
192
90

Area we serve

high-temperature exhaust systems
321 stainless steel tube withstands temperatures up to 900°C, ideal for high-temperature exhaust systems. Titanium in 321 stainless steel tube prevents oxidation, harmful chromium carbide formation, and corrosion, especially in sulfur-containing environments. 321 stainless steel tube can reduce harmful emissions. 321 stainless steel tube resist vibrations and high-stress, ensuring exhaust system longevity. 321stainless steel tube can be easily welded and integrated with other exhaust components due to similar thermal expansion properties, facilitating installation and maintenance.
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heat exchange equipment
321 stainless steel tubes are well-suited for heat exchange equipment due to their exceptional high-temperature resistance, corrosion resistance, and thermal stability. Their ability to withstand temperatures up to 900°C without compromising structural integrity ensures efficient heat transfer. The addition of titanium stabilizes the alloy, preventing sensitization and intergranular corrosion. Furthermore, the material's resistance to oxidation and formation of detrimental chromium carbides enhances its corrosion resistance. The stable oxide layer formed on the surface of the tubes provides lasting protection against corrosive environments. 321 stainless steel pipes also exhibit good thermal stability, withstanding rapid temperature changes. These features, combined with weldability and compatibility with various fluids, make 321 stainless steel tubes an ideal choice for heat exchange equipment in industries such as chemical processing, power generation, and HVAC.
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chemical processing
321 stainless steel tubes are widely used in chemical processing due to their excellent corrosion resistance, high-temperature stability, weldability, and compatibility with various chemicals. The addition of titanium in the alloy composition forms a protective oxide layer on the surface, enhancing corrosion resistance against acids, solvents, and corrosive chemicals. 321 stainless steel can withstand high temperatures up to 900°C without deformation, ensuring reliable performance in chemical processing operations. Its weldability enables efficient fabrication and assembly of equipment, while resistance to intergranular corrosion prevents material degradation. Furthermore, 321 stainless steel rubes exhibits good compatibility with a wide range of chemicals commonly used in chemical processing, ensuring long-term durability and safety. These properties make 321 stainless steel tubes an ideal choice for chemical processing, providing corrosion resistance, temperature stability, weldability, and chemical compatibility essential for efficient and reliable chemical processes.
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power generation
321 stainless steel tubes are commonly used in power generation due to their excellent heat resistance, corrosion resistance, mechanical properties, weldability, and fuel compatibility. These tubes can withstand high temperatures encountered in power generation processes, ensuring thermal efficiency and reliability. The addition of titanium in the alloy composition forms a protective oxide layer, providing outstanding resistance to corrosion from steam, water, and chemicals. The tubes' mechanical properties, including high strength and toughness, enable them to handle high-pressure conditions and mechanical stresses in power generation equipment. Their weldability allows for easy fabrication and assembly, ensuring leak-free connections. Additionally, 321 stainless steel is compatible with diverse fuels. With these qualities, 321 stainless steel tubes contribute to the efficient and safe operation of power generation equipment, providing durability, resistance to high temperatures and corrosion, and facilitating optimal performance in power generation applications.
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aerospace application
321 stainless steel tubes are extensively used in aerospace applications due to their high strength, heat resistance, corrosion resistance, lightweight nature, and weldability. These tubes offer a superior strength-to-weight ratio, allowing for lightweight yet structurally robust aerospace components. They can withstand high temperatures up to 900°C without significant deformation, ensuring reliable performance in aerospace engines and propulsion systems. The titanium content in 321 stainless steel forms a protective oxide layer, providing exceptional resistance to corrosion from atmospheric moisture and aggressive chemicals. This corrosion resistance contributes to the longevity and reliability of aerospace components. Additionally, the lightweight nature of 321 stainless steel helps enhance overall fuel efficiency, payload capacity, and maneuverability in aircraft. The weldability of these tubes facilitates efficient fabrication and assembly processes, enabling the production of complex aerospace structures with minimal defects.
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oil and gas industry
The presence of titanium in 321 stainless steel provides excellent resistance to corrosion from a wide range of corrosive substances encountered in the oil and gas industry. This corrosion resistance ensures the longevity and reliability of pipelines, offshore platforms, and equipment operating in harsh environments. 321 stainless steel tubes can withstand high temperatures encountered in oil and gas processing, maintaining their mechanical properties and resisting deformation even at elevated temperatures. The weldability of 321 stainless steel enables efficient fabrication and assembly of pipelines, fittings, and other components. This facilitates the construction and installation processes, ensuring strong connections and minimizing the risk of leaks in the oil and gas infrastructure. Additionally, 321 stainless steel tubes possess high strength and durability, they can withstand demanding conditions and maintain their structural integrity, providing long-term performance and reducing the need for frequent maintenance or replacements. Moreover, 321 stainless steel is compatible with a wide range of hydrocarbons, making it suitable for carrying and storing oil, gas, and other petroleum products. It can withstand the corrosive effects of hydrocarbons and their byproducts, ensuring the integrity and reliability of oil and gas infrastructure.
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321 stainless steel tube FAQ

321 stainless steel tubes exhibit excellent corrosion resistance. Besides, 321 stainless steel tubes offer good strength and stability at high temperatures.
Because of its easy cleaning and resistance to intergranular corrosion at high temperatures, 321 stainless steel is ideal for food processing equipment and storage.
Yes, 321 stainless steel tube is chemically compatible with a wide range of substances. It exhibits excellent resistance to corrosion from many organic and inorganic acids, including sulfuric acid, nitric acid, acetic acid, and citric acid. It is also resistant to alkaline solutions and oxidizing agents.
321 stainless steel tube is called 1.4541 stainless steel tube on EU standard.
Compared to 304 stainless steel tubes, 321 stainless steel tubes offer enhanced corrosion resistance, particularly against intergranular corrosion, better high-temperature strength, improved weldability, and resistance to crevice and stress corrosion cracking.
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