ASTM A179 Cold-Drawn Seamless Low Carbon Steel U Bend Tube for Heat Exchangers
ASTM A179 U-Bend Tube — Cold-Drawn Seamless Low-Carbon Steel Tubing for Heat Exchangers
Material
ASTM A179 U-bend tubes are seamless, cold-drawn low-carbon steel tubes that are formed into a U-shape for shell-and-tube heat exchangers, condensers, coolers, and similar heat-transfer equipment. The base tube is produced by the seamless process and cold drawing, then bent to the required radius/leg length with strict control of dimensional stability and surface condition.
Specification
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Product type: U-bend (U-tube) for heat exchangers
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Base material / standard: ASTM A179 / A179M (often referenced as SA179 for similar procurement language)
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Manufacturing route: Seamless → cold drawn → U-bending (per drawing)
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Typical base tube OD range (ASTM A179 scope): 1/8" to 3" (3.2–76.2 mm)
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Key U-bend parameters (customized):
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Bend radius (CLR), leg length, tangent length, straight length, end finish
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Controlled ovality and wall thinning at the bend (measured and reportable)
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Key Features
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Excellent heat-transfer suitability: smooth OD/ID, consistent wall, stable geometry from cold-drawn tubing
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Reliable forming performance: low-carbon chemistry supports bending, expanding, and rolling operations commonly required for tube-to-tubesheet assembly
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Quality verification: chemistry control + mechanical testing + typical tube tests (e.g., hardness/flattening/flaring/hydrostatic or NDT options per order)
Our Advantages
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How do you control wall thinning and ovality at the U-bend?
We control bending tooling, lubrication, and forming parameters, and can provide bend-area measurements (ovality and wall-thinning). Many buyers specify limits (e.g., ovality and thinning caps) for U-tubes; we can manufacture and inspect to your project criteria and supply inspection records. -
What inspections and documentation will I receive?
We provide full traceability by heat/lot and Mill Test Certificate (EN 10204 3.1 available upon request), plus compliance with required tests under ASTM tube requirements (chemical/product analysis and mechanical verification; hydrostatic or nondestructive testing when specified). -
How do you prevent contamination and shipping damage (critical for heat exchangers)?
We follow controlled finishing and packing practices (cutting/deburring/cleaning, end caps/sealing, and export packing) to protect tube ends and internal cleanliness during transport and storage.
Chemical Composition
| Grade / Standard | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V | Nb | Ti | Al |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A179 | 0.06–0.18 | — | 0.27–0.63 | ≤0.035 | ≤0.035 | — | — | — | — | — | — | — | — |
| ASTM A192 | 0.06–0.18 | ≤0.25 | 0.27–0.63 | ≤0.035 | ≤0.035 | — | — | — | — | — | — | — | — |
| ASTM A210 Gr. A-1 | ≤0.27 | ≥0.10 | ≤0.93 | ≤0.035 | ≤0.035 | — | — | — | — | — | — | — | — |
| EN 10216-2 P235GH (1.0345) | ≤0.16 | ≤0.35 | ≤1.20 | ≤0.025 | ≤0.020 | ≤0.30 | ≤0.30 | ≤0.30 | ≤0.08 | ≤0.02 | ≤0.01 | ≤0.04 | ≥0.02 |
| JIS G 3461 STB340 | ≤0.18 | ≤0.35 | 0.30–0.60 | ≤0.035 | ≤0.035 | — | — | — | — | — | — | — | — |
Note: “—” indicates not specified in the cited summaries for that grade.
Mechanical Properties (5 Reference Grades)
| Grade / Standard | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|
| ASTM A179 | ≥325 | ≥180 | ||
| ASTM A192 | ≥325 | ≥180 | ≥35 | ≤77 HRB |
| ASTM A210 Gr. A-1 | ≥415 | ≥255 | ≥30 | ≤79 HRB |
| EN 10216-2 P235GH (T ≤ 16 mm reference) | 360–500 | ≥235 | ≥25 | — |
| JIS G 3461 STB340 | ≥340 | ≥175 | ≥35 | — |
Standards
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ASTM: ASTM A179/A179M (base tube) + ASTM A450/A450M (general requirements for carbon/low alloy steel tubes)
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EN: EN 10216-2 (pressure-purpose seamless tubes with elevated temperature properties; e.g., P235GH)
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GOST: GOST 8733 (technical requirements for cold-deformed seamless pipes) + GOST 8734 (size range for cold-formed seamless tubes)
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JIS: JIS G 3461 (carbon steel boiler & heat exchanger tubes; e.g., STB340)
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GB: GB/T 3639 (seamless cold-drawn/cold-rolled precision tubes) and project-driven selections such as GB 3087 for boiler service, when specified
Application Areas
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Power generation & boilers: condensers, feedwater heaters, economizers (U-tube bundles)
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Oil & gas / refining: coolers, condensers, heat-recovery exchangers
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Chemical & petrochemical: process heat exchangers, surface coolers
U-bend geometry is used primarily in shell-and-tube exchangers to enable compact multi-pass flow paths and efficient bundle layout.
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.
If you have another question, pls feel free to contact with me.
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