Heat Exchanger U Tube Stainless Steel Seamless Pipe For Boiler And Heat Exchanger

ASTM A213 U-tube seamless stainless steel pipes are precision-manufactured for high-temperature boiler and heat-exchanger applications. Available in a variety of grades (TP304, TP304L, TP316, TP316L, TP321), they combine excellent corrosion resistance, high strength, and thermal stability. Typical sizes range from ⅛" to 5" OD (3.2 mm–127 mm) with wall thicknesses from 0.4 mm to 12.7 mm. Five comparable grades are summarized below with both their chemical compositions and mechanical properties. Conforming to major international standards (ASTM A213/ASME SA213, EN 10216-5, GOST 9940/9941-81, JIS G3459, GB/T 24791), these tubes find broad use in petrochemical, power generation, food processing, HVAC, and other industries.

Material

These tubes are produced from austenitic stainless steel alloys, offering a face-centered cubic (FCC) crystal structure that imparts:

• Non-magnetic behavior

• Outstanding formability and weldability

• High resistance to oxidation and most corrosive environments

Specifications

• Standard: ASTM A213 / ASME SA213 for seamless ferritic and austenitic boiler, superheater, and heat-exchanger tubes

• Size Range:

  • Outside diameter: ⅛" to 5" (3.2 mm–127 mm)

  • Wall thickness: 0.015"–0.500" (0.4 mm–12.7 mm)

• Forming: Hot-rolled, cold-drawn, surface-finished (bright annealed, pickled)

• Delivery Conditions: Annealed, stress-relieved, solution-annealed

Chemical Composition

Mechanical Performance

Main Characteristics

• Corrosion Resistance: Excellent against oxidizing and reducing acids, chloride environments

• High-Temperature Performance: Maintains strength and creep resistance up to ~800 °C

• Formability: Ready for bending into U-tubes with minimal cold work

• Weldability: No post-weld annealing required for thin sections (≤ 6 mm for TP304L)

• H-Grades: Variants such as TP304H, TP316H offer enhanced creep-rupture strength for severe duty

Execution Standards

• ASTM A213 / ASME SA213: Seamless ferritic & austenitic boiler, superheater, heat-exchanger tubes

• EN 10216-5: Seamless steel tubes for pressure purposes (austenitic stainless)

• GOST 9940-81 / 9941-81: Russian standard for seamless hot/cold deformed corrosion-resistant tubes

• JIS G3459: Japanese Industrial Standard for heat-resistant stainless steel tubes

• GB/T 24791: Chinese national standard for seamless stainless steel heat-exchanger tubes

Application Fields

These U-tube seamless pipes are widely used in:

• Power & Energy: Boiler tubes, superheater, reheater, steam generator U-tubes

• Petrochemical & Refining: Shell-and-tube heat exchangers, condensers, reboilers

• Chemical Processing: Reactor coils, transfer lines for corrosive fluids

• Food & Beverage: Pasteurizers, evaporators, CIP systems (TP304L)

• HVAC & Refrigeration: Chillers, evaporators, condensers

• Marine & Offshore: Heat-exchanger bundles in seawater-cooled systems

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,

it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

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