ASME SA423 Gr.1 ERW Welded Steel Tube Corten Steel Heat Exchanger Tube
ASTM A423 / ASME SA423 Grade 1 ERW Carbon Steel Tube Heat Exchanger Tube
ASTM A423 / ASME SA423 Grade 1 Welded Corton Steel Tube Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Cu | V | Ni |
| A/SA423 Gr.1 | 0.15 max | 0.1 min | 0.55 max | 0.06-0.16 | 0.06 max | 0.24-1.31 | 0.2-0.6 | – | 0.2-0.7 |
ASTM A423 / ASME SA423 Grade 1 Welded Corton Steel Tube Mechanical Properties
|
Grade |
Minimum yield point ReH Mpa *) |
Tensile strength Rm MPa |
Minimum elongation A (Lo=5.65 √So) % |
|
COR-TEN A |
355 |
470-630 |
20 |
Comparison with Other Common Heat Exchanger Tubes
| Material | Pros | Cons | Best For |
|---|---|---|---|
| ASTM A423 Gr.1 | Good atmospheric corrosion resistance, cost-effective, good weldability/ductility. | Not for highly corrosive environments. Lower strength than some alloys. | Mildly corrosive cooling water, environments where condensation causes carbon steel to rust. |
| ASTM A179 (C.S.) | Low cost, excellent thermal conductivity, readily available. | Poor corrosion resistance, prone to rust. | Non-corrosive services (closed-loop cooling, oil). |
| ASTM A423 Gr.2 | Better corrosion resistance than Gr.1 due to added Nickel. | Slightly higher cost than Gr.1. | More aggressive environments than Gr.1, but not severe enough for stainless. |
| ASTM A249 TP304 (SS) | Excellent corrosion resistance, high strength. | Higher cost, prone to stress cor |
Why Choose ASTM A423 Gr.1 ERW Tube?
You would specify this material when:
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The service environment (air or water) causes premature failure of carbon steel tubes due to rusting.
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The operational cost of unexpected downtime and tube replacement outweighs the slightly higher initial material cost compared to A179.
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The corrosion conditions are not severe enough to justify the expense of stainless steel (A249) or copper-nickel alloys.
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You need a reliable, code-compliant (ASME SA423) material that offers a proven balance of performance, fabricability, and life-cycle cost.
Applications
This material is selected for specific service conditions where carbon steel isn't enough, but stainless is overkill.
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Power Plant Feedwater Heaters
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Condensers (especially with cooling water that is mildly corrosive)
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Industrial Heat Exchangers in chemical and petrochemical plants
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General Service Heat Exchangers exposed to atmospheric corrosion or where longer life is desired over carbon steel.
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