ASTM A179/A179M   Seamless Colddrawn Lowcarbon Steel Tubes for Tubular Heat Exchangers, Condensers, and Similar Heat Transfer Apparatu

Scope

Covers seamless colddrawn lowcarbon steel tubes for heat exchangers, condensers, and similar heattransfer equipment. Suitable for moderatetemperature service where corrosion resistance and strength are required.

Ordering Information

Purchasers must specify:  

 Quantity (total length or number of tubes)  

 Material (seamless colddrawn lowcarbon steel)  

 Dimensions (outside diameter, wall thickness – in inches [A179] or mm [A179M])  

 Length (cut to size or random lengths)  

 ASTM Designation (A179 for inchpound 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 openhearth, electric furnace, or basic oxygen process.  

 Manufacturing Method: Tubes are colddrawn, seamless, and supplied in asdrawn 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 thirdparty 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  

l  Seamless steel tubes  

l  Lowcarbon steel  

l  Heat exchangers  

l  Condenser tubes  

l  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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