Seamless Stainless Steel U-tube is a specific type of heat exchanger tube that is bent into a"U"shape after the manufacturing process. It is crafted from a single, solid billet of stainless steel and, like other seamless tubes, has no weld joint. This seamless construction is crucial for maintaining structural integrity and reliability, especially in high-stress and corrosive environments. The unique U-shape allows for thermal expansion and contraction, making it ideal for shell and tube heat exchangers. It enables a single-pass fluid flow on the shell side and a multi-pass flow on the tube side, maximizing heat exchange efficiency and reducing the overall footprint of the heat exchanger.① STANDARD: ASTM A213② OD RANGE : 6-50.8MM③ THICKNESS RANGE: 0.5-9MM④ U-BEND & STRAIGHT
Seamless Stainless Steel U-tube is a specific type of heat exchanger tube that is bent into a"U"shape after the manufacturing process. It is crafted from a single, solid billet of stainless steel and, like other seamless tubes, has no weld joint. This seamless construction is crucial for maintaining structural integrity and reliability, especially in high-stress and corrosive environments. The unique U-shape allows for thermal expansion and contraction, making it ideal for shell and tube heat exchangers. It enables a single-pass fluid flow on the shell side and a multi-pass flow on the tube side, maximizing heat exchange efficiency and reducing the overall footprint of the heat exchanger.
Seamless Stainless Steel U-tubes offer a unique combination of benefits that make them invaluable in demanding heat transfer applications:
Superior Heat Transfer Efficiency: The U-shape design allows for multiple passes within the same shell, significantly increasing the effective surface area for heat exchange and improving thermal efficiency.
High Pressure and Temperature Tolerance: The seamless construction and robust material allow the tube to safely handle high internal pressures and extreme temperatures without the risk of rupture, ensuring operational safety.
Exceptional Corrosion Resistance: Stainless steel's inherent properties provide outstanding resistance to oxidation, pitting, and crevice corrosion, ensuring a long service life even in harsh chemical environments.
Enhanced Durability: The absence of a weld seam eliminates a potential weak point, making the tube more durable and reliable under mechanical stress and vibration.
Reduced Footprint: The compact U-tube design allows for a more efficient and space-saving heat exchanger configuration compared to straight-tube designs with similar heat exchange capacity.
Heat exchanger is a device used to transfer heat between a solid object and a fluid, or between two or more fluids at different temperatures, transfer heating from higher temperature fluid to lower temperature object to make fluid temperature to specified requirement, for stainless steel grades, there are shell and tube heat exchanger, plate heat exchangers, plate and shell heat exchanger and other heat exchanger, tube heat exchanger consists of a number of tubes inside bundle and sheet, widely used in many industries.
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American Standard |
Austenitic Steel: |
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TP304, TP304L, TP304H, TP304N, TP310S, TP316, TP316L, TP316Ti, TP316H, TP317, TP317L, TP321, TP321H, TP347, TP347H,904L… |
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Duplex Steel: |
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S32101, S32205, S31803, S32304, S32750, S32760 |
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Others:TP405,TP409, TP410, TP430, TP439,... |
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European Standard |
1.4301, 1.4307, 1.4948, 1.4541,1.4878, 1.4550, 1.4401, 1.4404, 1.4571, 1.4438, 1.4841, 1.4845, 1.4539, 1.4162, 1.4462, 1.4362, 1.4410, 1.4501 |
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Size Tolerance |
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Tube Kinds |
SA213 OD(D) |
SA213 Thickness(S) |
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OD(mm) |
OD Tolerance(mm) |
OD(mm) |
Thickness Tolerance(mm) |
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Hot Rolled |
=101.6 |
+0.4~-0.8 |
76~168.3 |
+28%~0 |
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>101.6~168.3 |
+0.4~-1.2 |
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Cold Drawn |
<25.4 |
0.1 |
=38.1 |
+20%~0 |
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25.4~38.1 |
0.15 |
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>38.1~<50.8 |
0.2 |
>38.1 |
+22%~0 |
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50.8~<63.5 |
0.25 |
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63.5~<76.2 |
0.3 |
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76.2~101.6 |
0.38 |
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Production |
Outside Diameter |
Wall Thickness |
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Heat Exchanger Tube |
6.00mm -203.2mm |
0.5mm - 21mm |
Solution Annealed & Pickled/Bright Annealed.
TP321 Seamless Stainless Steel Tube is a titanium-stabilized austenitic tube known for their excellent resistance to intergranular corrosion and superior high-temperature strength. These tubes are ideal for applications requiring stability at elevated temperatures, such as in heat exchangers, aerospace systems, and petrochemical industries. ① STANDARD: ASTM A213/ EN10216-5/ASTM A249/ ASTM A269/ GOST 9940 /GOST 9941...② OD RANGE : 6-257MM③ THICKNESS RANGE: 1-35 MM
TP309 Seamless Stainless Steel Pipe are high-performance tubing solutions designed for superior heat and corrosion resistance in demanding environments. ① STANDARD: ASTM A312/ ASTM A249/ ASTM A269/ EN10216-5/GOST 9940 /GOST 9941...② OD RANGE : 6-1016 MM③ THICKNESS RANGE: 1-65 MM
Seamless 654SMO Super Stainless Steel Tube UNS S32654, W. Nr. 1.4652) is a high-performance super austenitic stainless steel alloy, often classified as a "super stainless steel" due to its exceptional corrosion resistance and mechanical strength. Developed for the most demanding environments, it features unusually high levels of chromium (24%), molybdenum (7-8%), nickel (23%), and nitrogen (0.45-0.55%), enabling pitting resistance equivalent number (PREN) values exceeding 50—comparable to top nickel-based alloys like Hastelloy. The seamless design ensures superior integrity for high-pressure, high-temperature, and corrosive applications, avoiding weld-related vulnerabilities. It is twice as strong as conventional austenitic grades like 304 or 316 while maintaining excellent ductility and toughness.① STANDARD: ASTM A312/EN10216-5/GBT14976.② OD RANGE : 6.35-257MM③ THICKNESS RANGE: 0.89-35MM
TP310MOLN/S31050 Seamless Stainless Steel Tube ，310MoLN stainless steel, also known as UNS S31050, is a fully austenitic stainless steel with optimized properties for specific applications. Let’s explore its characteristics and where it finds use in various industries:Urea Plants:310MoLN is specifically designed for applications in urea plants.It provides improved corrosion resistance in urea carbamate environments, such as high-pressure strippers.The nitrogen content in its chemical composition helps stabilize and strengthen the austenitic phase.Chemical Processing:Due to its excellent corrosion resistance, 310MoLN is used in chemical processing equipment.It performs well in aggressive chemical environments, including acids and chlorides.High-Temperature Applications:310MoLN is suitable for high-temperature environments.It finds use in furnace components, such as burners, retorts, and conveyor belts.Petrochemical Industry:In petrochemical plants, 310MoLN is employed for tube hangers.Its resistance to oxidation and high-temperature strength are advantageous.Mineral Equipment and Cement Production:Used in mineral processing equipment and cement production due to its high strength at elevated temperatures.Remember that 310MoLN stainless steel offers a unique combination of properties, making it valuable in critical applications.① STANDARD: ASTM A213/ ASTM A249/ ASTM A269/EN10216-5/ GOST 9940 /GOST 9941...② OD RANGE : 6-257MM③ THICKNESS RANGE: 1-35 MM
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