ASTM A178 ERW Welded Carbon Steel Tube Supplier
For Boiler & Superheater Service – OD 6~204mm | WT 1~18mm
Product Overview
Our ASTM A178 / ASME SA178 welded (ERW) carbon steel tubes are specifically designed for boiler and superheater service at low to medium pressures. Manufactured by electric resistance welding (ERW) with no filler metal addition, these tubes offer a cost-effective alternative to seamless boiler tubes for non-critical applications.
Key Specifications:
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Standard: ASTM A178 / ASME SA178
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Manufacturing: ERW (Electric Resistance Welded – no filler metal)
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Grades: A (Low Carbon), C (Medium Carbon), D (Carbon-Manganese)
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Outer Diameter: 6mm – 204mm (Standard Stock: 19mm – 89mm)
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Wall Thickness: 1mm – 18mm
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Length: 3m – 12m (Custom lengths available)
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Heat Treatment: Normalized after welding – stress relieved weld seam
✅ ASTM A178 certified – Compliant with ASME Boiler & Pressure Vessel Code Section II
✅ ERW manufacturing – Cost-effective alternative to seamless
✅ Heat treated after welding – Stress relieved weld seam – uniform properties
✅ Multiple grades – A (general), C (higher strength), D (highest strength)
✅ 100% hydrostatic or NDT tested – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC provided with heat number
✅ Factory direct – Competitive pricing and fast delivery
Grade Selection
| Grade | Carbon Content | Strength Level | Best Application |
|---|---|---|---|
| A | Low (0.06-0.18%) | Standard | General boiler service |
| C | Medium (≤0.35%) | Higher | High temperature boilers |
| D | Carbon-Manganese | Highest | Demanding superheater service |
💡 Grade A is the most economical for general boiler service. Grade C and D provide higher strength for more demanding applications.
Chemical Composition
| Element | Grade A | Grade C | Grade D |
|---|---|---|---|
| Carbon (C) | 0.06-0.18% | ≤0.35% | ≤0.27% |
| Manganese (Mn) | 0.27-0.63% | ≤0.80% | 1.00-1.50% |
| Phosphorus (P) | ≤0.035% | ≤0.035% | ≤0.030% |
| Sulfur (S) | ≤0.040% | ≤0.035% | ≤0.015% |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| C | ≥415 | ≥255 | ≥30 |
| D | ≥485 | ≥275 | ≥30 |
📌 Mechanical properties apply to Grades C and D. Grade A is typically used for general service where specific strength requirements are not critical.
Manufacturing Process – ERW (Electric Resistance Welding)
ERW Process Highlights:
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Steel coil – The starting material is high-quality carbon steel strip
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Forming – The strip is roll-formed into a cylindrical shape
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ERW welding – High-frequency electric resistance welding (no filler metal)
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Heat treatment – Normalized after welding – stress relieves the weld seam
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Sizing – Final diameter achieved by passing through sizing rolls
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100% NDT testing – Weld seam inspection and hydrostatic test
ASTM A178 vs Seamless Boiler Tubes (SA192/SA179)
| Feature | ASTM A178 (ERW) | Seamless (SA192/SA179) |
|---|---|---|
| Manufacturing | ERW Welded (no filler metal) | Seamless |
| Cost | Lower (more economical) | Higher |
| Pressure rating | Medium | Highest |
| Weld seam | Present (heat treated) | No weld seam |
| Best for | Non-critical, cost-sensitive | Critical high pressure |
💡 Choose ASTM A178 for budget-conscious projects where pressure requirements are moderate and seamless tubes are not specified.
Key Applications
| Industry | Application | Recommended Grade |
|---|---|---|
| Industrial Boilers | Steam generation | Grade A |
| Low Pressure Boilers | Water wall tubes | Grade A |
| Superheater Flues | High temperature gas | Grade C, D |
| Safe Ends | Boiler connections | Grade A |
| Heat Recovery Boilers | Economizer sections | Grade A |
Why Choose Our ASTM A178 ERW Tubes?
| Advantage | Description |
|---|---|
| Cost-effective | Lower price than seamless boiler tubes |
| Heat treated weld seam | Stress relieved – uniform properties |
| Multiple grades | A, C, D – match strength to service |
| Wide size range | OD 6-204mm – one-stop sourcing |
| Standard stock sizes | 19-89mm – ready to ship |
| 100% tested | Hydrostatic or NDT on every tube |
| Full traceability | EN 10204 3.1 MTC with heat number |
Contact for Quote
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: www.hzhmetals.com / www.wuxihengzhihui.com
Contact Person: Alice Yuan
Reply within 24 hours.
Tags: ASTM A178 ERW Boiler Tube Electric Resistance Welded Tube ASME SA178 Welded Steel Tube Boiler Tube
