A179 Seamless steel pipe Product Overview
The ASTM A179 Seamless Steel Tube is a cold-drawn, low-carbon steel tubing engineered for heat exchangers, condensers, and boilers operating at temperatures ≤400°C (752°F). With a minimum yield strength of 180 MPa and tensile strength ≥325 MPa, it delivers exceptional thermal conductivity (45–50 W/m·K) while resisting deformation under cyclic thermal stress. Manufactured from SAE 1006–1020-grade steel, these tubes meet ASME Boiler & Pressure Vessel Code Section II standards for critical heat transfer applications.
Key Technical Specifications
1. Dimensional & Manufacturing Properties
- Size Range:
- Seamless Tubes: 6.35 mm (¼”) to 914 mm (36″) OD | Wall Thickness: 1.25–50 mm
- Welded Tubes: 21.3–3,620 mm OD | Wall Thickness: 1.65–65 mm
- Tolerance:
- OD: ±0.8% (seamless), ±1.0% (welded)
- Wall Thickness: ±10% (standard), ±5% (precision-drawn)
- Surface Finishes:
- Bright Annealed: Ra ≤0.8 µm (mirror polish for hygienic systems)
- Pickled & Oiled: Anti-rust protection for long-term storage
2. Mechanical & Chemical Performance
Chemical Composition:
| Element | Content (%) | Function |
|---|---|---|
| Carbon (C) | 0.06–0.18 | Enhances weldability & ductility |
| Manganese (Mn) | 0.27–0.63 | Improves tensile strength |
| Phosphorus (P) | ≤0.035 | Reduces brittleness |
| Sulfur (S) | ≤0.035 | Minimizes hot cracking |
| Silicon (Si) | ≤0.25 | Deoxidizes molten steel |
Mechanical Properties:
| Property | Value | Test Standard |
|---|---|---|
| Yield Strength | ≥180 MPa | ASTM E8/E8M |
| Tensile Strength | ≥325 MPa | ASTM E8/E8M |
| Elongation | ≥35% (in 50 mm) | ASTM A370 |
| Hardness | ≤72 HRB | ASTM E18 |
Applications by Industry
| Industry | Use Case | Performance Benefit |
|---|---|---|
| Power Generation | Boiler tubes, condenser bundles | Withstands 15–30 MPa steam pressure |
| Oil & Gas | Shell-and-tube heat exchangers | Resists H₂S-induced cracking (NACE MR0175 compliant) |
| HVAC | Chiller tubes, refrigeration systems | Achieves 85–92% thermal efficiency |
| Chemical Processing | Reactor cooling coils | Tolerates pH 2–12 corrosive fluids |
| Food & Pharma | Sterilization & pasteurization systems | Meets FDA/3-A Sanitary Standards |
Certifications & Compliance
- Quality Standards: ASTM A179, ASME SA179, EN 10216-1, JIS G3461
- Certifications: ISO 9001:2015, PED 2014/68/EU, TÜV NRB
- Traceability: Full PMI (Positive Material Identification) & EN 10204 3.1 Mill Certificates
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