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0102030405
Seamless Cold Drawn Low Carbon Steel Tubes for Heat Exchangers - China Suppliers & Factory
Ordering Information
- 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, non-destructive 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 TestEach tube must withstand a specified water pressure without leakage (unless replaced by non-destructive testing).
⚡
Nondestructive Electric Test (NDE)Optional alternative to hydrostatic testing (e.g., eddy current or ultrasonic testing).
🔩
Flattening TestA sample tube must flatten without cracking to a specified distance.
📐
Flaring TestA cone expansion test to verify ductility (if required).
🔬
Hardness TestOptional, 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 (FAQ)
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 primarily used in tubular heat exchangers, condensers, and similar heat-transfer apparatus. It ensures consistent quality, mechanical performance, and corrosion resistance for thermal applications in power plants, refineries, and chemical processing industries.
What is the difference between ASTM A179 and ASTM A179M?
ASTM A179 uses inch-pound units for dimensions and mechanical properties, while ASTM A179M is the metric equivalent of the same standard. Both cover the same material requirements but differ in the unit system used for ordering and dimensional specifications.
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). These properties ensure the tubes can withstand thermal and mechanical stresses in service.
What testing methods are required for ASTM A179 tubes?
Each tube must pass either a hydrostatic pressure test or a non-destructive electric test (NDE) such as eddy current or ultrasonic testing. Additional tests including the flattening test, flaring test, and optional hardness test may also be required depending on the purchaser's specifications.
What information must be specified when ordering ASTM A179 tubes?
When placing an order, purchasers must specify the quantity, material grade, outside diameter, wall thickness, length (cut or random), applicable ASTM designation (A179 or A179M), testing requirements, certification needs, and any additional requirements such as special finishes or markings.
Are mill test reports and third-party certifications available for ASTM A179 tubes?
Yes. Mill test reports covering chemical composition and mechanical properties are available upon request. Purchasers may also request third-party inspection or verification in addition to the manufacturer's standard quality control procedures to ensure full compliance with ASTM A179 / A179M requirements.