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0102030405
Seamless Cold Drawn Low Carbon Steel Tubes for Heat Exchangers - China Suppliers & Factory
Ordering Information
Purchasers must specify the following:
- Quantity (total length or number of tubes)
- Material (seamless cold-drawn low-carbon steel)
- Dimensions (outside diameter, wall thickness – in inches [A179] or mm [A179M])
- Length (cut to size or random lengths)
- ASTM Designation (A179 for inch-pound units, A179M for metric)
- Testing Requirements (hydrostatic, nondestructive electric test, or other)
- Certification (if required)
- Additional Requirements (special finishes, marking, etc.)
Material & Manufacture
🔩 Steel Process: Made by open-hearth, electric furnace, or basic oxygen process.
⚙️ Manufacturing Method: Tubes are cold-drawn, seamless, and supplied in as-drawn or annealed condition.
Chemical Composition (%)
| Element | Requirement |
|---|---|
| Carbon (C) | 0.06 – 0.18 |
| Manganese (Mn) | 0.27 – 0.63 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 325 MPa (47,000 psi) |
| Yield Strength | ≥ 180 MPa (26,000 psi) |
| Elongation (in 2 in./50 mm) | ≥ 35% |
Test Requirements
- Hydrostatic Test: Each tube must withstand a specified water pressure without leakage (unless replaced by nondestructive testing).
- Nondestructive Electric Test (NDE): Optional alternative to hydrostatic testing (e.g., eddy current or ultrasonic testing).
- Flattening Test: A sample tube must flatten without cracking to a specified distance.
- Flaring Test: A cone expansion test to verify ductility (if required).
- Hardness Test: Optional, per agreement.
Dimensions & Tolerances
- Outside Diameter: Permissible variations specified.
- Wall Thickness: Must meet minimum requirements with allowable tolerances.
- Length: Cut lengths (±1/8 in. or ±3.2 mm) or random lengths (as agreed).
Inspection & Certification
🔍 Inspection: By manufacturer; purchaser may request third-party verification.
📄 Certification: Mill test reports (chemical & mechanical properties) available upon request.
Marking Requirements
Each tube must be marked with:
- ASTM standard (A179/A179M)
- Manufacturer's name or trademark
- Size (OD & wall thickness)
- Heat number or identification
Keywords
Seamless Steel Tubes
Low-Carbon Steel
Heat Exchangers
Condenser Tubes
Cold-Drawn
This standard ensures quality, strength, and corrosion resistance for heat-transfer applications in power plants, refineries, and chemical processing.
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Frequently Asked Questions
What is ASTM A179/A179M and what is it used for?
ASTM A179/A179M is a standard specification for seamless cold-drawn low-carbon steel tubes used in tubular heat exchangers, condensers, and similar heat-transfer apparatus in industries such as power generation, oil refining, and chemical processing.
What is the difference between ASTM A179 and A179M?
ASTM A179 uses inch-pound units for dimensions and specifications, while ASTM A179M is the metric equivalent. Both cover the same material and manufacturing requirements but differ in the unit system used for ordering and measurement.
What are the key mechanical property requirements for ASTM A179 tubes?
ASTM A179 tubes must meet a minimum tensile strength of 325 MPa (47,000 psi), a minimum yield strength of 180 MPa (26,000 psi), and a minimum elongation of 35% in 2 inches (50 mm), ensuring excellent ductility and strength for heat-transfer service.
What testing methods are required for ASTM A179 tubes?
Each tube must pass either a hydrostatic pressure test or a nondestructive electric test (such as eddy current or ultrasonic testing). Additional tests including flattening, flaring, and hardness tests may also be required depending on the purchaser's specifications.
What information must be provided when ordering ASTM A179 tubes?
When placing an order, purchasers must specify the quantity, material grade, dimensions (OD and wall thickness), length, ASTM designation (A179 or A179M), testing requirements, certification needs, and any additional special requirements such as surface finish or marking.
Are mill test reports and third-party certifications available for ASTM A179 tubes?
Yes. Mill test reports covering both chemical composition and mechanical properties are available upon request. Purchasers may also request third-party inspection or verification to ensure compliance with ASTM A179/A179M requirements.