ASME SA179 carbon steel tube is a seamless cold-drawn low-carbon steel tube specified under ASME SA179/SA179M. It is not a general-purpose fluid pipe, but a dedicated tube designed for shell-and-tube heat exchangers, condensers and other heat transfer equipment. Its core requirements feature thin wall, precise dimensional tolerance and superior surface finish to ensure high heat transfer efficiency. Lordfintube supplies reliable SA179 heat exchanger tubes and SA179 seamless tube solutions for thermal process projects worldwide.
Specification Scope
The specification system of ASME SA179 is oriented toward small outer diameter, thin wall and high precision. All dimensions shown are typical range, final specifications shall be confirmed by project requirements and manufacturer technical documents.
| Parameter Item | Typical Range | Unit |
|---|---|---|
| Outer diameter | 3.2 – 76.2 (1/8” – 3”), mainstream 6 – 63.5 | mm |
| Minimum wall thickness | 0.4 – 12.7, normal service 0.5 ~ 6.35 | mm |
| Length | 3000 – 16000; standard cut lengths 6m,12m. Custom lengths available | mm |
| U-bent tube max developed length | Up to 27 | m |
Chemical Composition
ASME SA179 has strictly controlled carbon content of 0.06% to 0.18%, manganese 0.27% to 0.63%, while phosphorus and sulfur each shall not exceed 0.035%. The low-carbon formulation delivers good ductility and fabrication performance. The cold-drawn process achieves higher dimensional accuracy and surface finish.
Mechanical Properties
Typical room-temperature properties: minimum tensile strength 325 MPa, minimum yield strength 180 MPa, minimum elongation 35%, hardness limited below HRB 72. The low hardness requirement is tailored for tube bundle fabrication processes such as tube rolling and bending. Excessively hard material tends to crack during tube expansion. Material is supplied in annealed condition after cold drawing to maintain low hardness for tube rolling, flaring and other tube bundle manufacturing operations.
Formula & Variable Description
Not applicable to this product type. ASME SA179 carbon steel tube is factory-certified finished seamless tube with fixed dimensional and mechanical properties. Designers shall follow ASME BPVC code and manufacturer test reports for allowable pressure-temperature rating, no independent calculation formula for material property prediction.
Design Trade-offs & Material Comparison
SA179 vs Common Boiler Tubes
| Item | ASME SA179 | SA192 / SA210 Boiler Tubes |
|---|---|---|
| Primary Purpose | Heat exchanger & condenser heat transfer tube | Boiler water wall, superheater, high pressure boiler circuit |
| Core Strength Focus | Ductility, smooth surface, tight tolerance for heat transfer | High temperature creep strength, pressure containment |
| Long Term Temp Envelope | Recommended below 350~425°C | Engineered for sustained high-temperature boiler service |
| Fabrication Strength | Excellent for tube rolling, flaring and U-bending | Less optimized for heavy tube expansion work |
Key Design Trade-offs
Dimension & Heat Transfer Balance
Small OD and thin minimum wall thickness maximizes heat transfer coefficient, but reduces maximum allowable working pressure. For higher pressure, thicker wall should be selected while balancing thermal performance.
Fabrication & Mechanical Risk
Annealed cold drawn SA179 offers superb expandability for tube sheet rolling, but thin-wall sections are vulnerable to mechanical erosion or water hammer damage in severe service.
Tube length vs transport limitation: Longer single lengths reduce weld joints in bundles, but create shipping and handling constraints. Custom cut lengths or pre-fabricated U-bent tubes solve assembly challenges.
Typical Service Conditions
The condition selection logic for ASME SA179 originates from its material nature: low-carbon steel + cold-drawn thin wall + seamless construction. This combination defines its suitable operating envelope and application limitations.
Core Application: Medium & Low Pressure Heat Transfer and Condensation
ASME SA179 is most typically used as heat transfer tubes for shell-and-tube heat exchangers and condensers. Specific applications include:
- Condensate pipes and low-temperature steam transfer tubes for medium and small industrial boilers, normally operating below 2.5 MPa and 350°C.
- Heat exchanger, condenser and reboiler tube bundles in petrochemical and chemical plants.
- Condenser systems for seawater desalination and power plants.
- Heat transfer piping for pharmaceutical and food processing equipment, leveraging its smooth cold-drawn surface that resists fouling accumulation.
Recommended Operating Boundary
ASME SA179 is primarily applied within medium-to-low temperature ranges. At elevated temperatures, carbon steel suffers limited creep strength and oxidation resistance. Long-term service temperature is generally recommended below 350°C to 425°C. Alloy steel tubes (e.g. SA213 T11, T22) shall be considered when exceeding this threshold.
Non-Recommended Service Scenarios
- Sour oil & gas or acidic corrosive media
- Design pressure over 2.5 MPa or temperature above 400°C
- High hydrogen partial pressure (hydrogen embrittlement risk, NACE evaluation required)
Common Misconception
Many confuse ASME SA179 with boiler tubes. There is partial overlap: ASME SA179 can be used for low-temperature heat transfer sections of boilers, but it is not designed for high-temperature high-pressure boiler water walls or superheaters. The mainstream boiler tube standards are SA192 (carbon steel boiler tubes) and SA210 (medium-carbon steel boiler tubes), which have more defined guarantees on high-temperature strength and creep resistance. The advantage of ASME SA179 lies in heat transfer efficiency and dimensional precision of thin-wall heat transfer surfaces, rather than sustaining severe high-temperature and high-pressure loads.
Material Selection Guidance
When selecting tubes for heat exchangers, the judgment logic can be simplified: if the process features low medium corrosivity, medium-low temperature, low pressure, and high requirements for heat transfer efficiency and dimensional accuracy — ASME SA179 offers a cost-effective option. Once operating conditions exceed this envelope, upgrade to alloy steel tubes or stainless steel tubes is required.
Quality Inspection & Testing
All SA179 seamless tubes undergo mandatory factory tests to meet ASME SA179 requirements. Typical inspection scope includes dimensional verification, chemical analysis, tensile test, flattening test, flaring test, hydrostatic test and non-destructive examination. All test records are available for project review upon request.
Packaging & Transportation
Finished SA179 tubes are packed in wooden case. Secure packaging prevents surface scratches, deformation and rusting during sea and land transit for export projects.
Frequently Asked Questions
Q1: What is ASME SA179 carbon steel tube used for?
A1: ASME SA179 carbon steel tube is cold-drawn seamless low carbon steel dedicated for shell and tube heat exchangers, condensers and reboiler tube bundles. It is optimized for heat transfer and tube rolling fabrication.
Q2: What is the maximum long-term working temperature for SA179 seamless tube?
A2: The recommended long-term operating temperature range is 350°C to 425°C. Continuous service above this limit reduces creep strength, alloy steel grades such as SA213 T11/T22 should be selected instead.
Q3: What does minimum wall thickness mean for SA179 tube?
A3: Minimum wall thickness means the measured wall at any point of tube shall not be less than the specified value. This method is widely used for heat exchanger tubes to guarantee consistent heat transfer performance.
Q4: Can SA179 tube be used in sour gas or high hydrogen partial pressure environments?
A4: Not recommended without evaluation. Sour service or high hydrogen partial pressure carries hydrogen embrittlement risk. NACE assessment or alloy material upgrade is required for these working conditions.
Q5: Can SA179 tubes be bent into U-tubes for heat exchangers?
A5: Yes. SA179 is supplied in annealed condition, suitable for U-bending. The maximum developed length of SA179 U-bent tube can reach up to 27 meters.
Q6: What is the difference between SA179 and SA192 boiler tube?
A6: SA179 is a heat transfer tube focusing on dimensional precision and ductility for heat exchanger bundles. SA192 is a boiler tube designed for high pressure boiler components like water walls, with higher focus on high temperature creep resistance.
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