Pick the alloy by what is attacking the tube
| Environment | Alloys we recommend |
|---|---|
| Brackish or polluted cooling water | C70600, C71500 copper-nickel |
| Chloride pitting, warm water | TP316L, SA789 duplex 2205 |
| Chloride stress corrosion cracking | SA789 duplex, SA268 ferritic, Alloy 825, Alloy 600 |
| Sulfuric and phosphoric acid | Alloy 825, C-276 |
| Hydrochloric and mixed acids, wet chlorine | C-276 |
| Hydrofluoric acid | Monel 400 |
| Caustic soda and potash | Nickel 200, Alloy 600 |
| Organic acids, pharmaceuticals, food | TP316L, TP304L, Nickel 200 |
| High temperature, oxidizing | Alloy 600, Alloy 800H |
What we supply
- Copper-nickel C70600 and C71500, pilgered, drawn, and tested in Hillsboro, for cooling water exchangers on the Gulf Coast.
- Stainless TP304L, TP316L, TP321, TP347 seamless and welded.
- Duplex SA789 2205, straight and U-bend, the 316L replacement that stops cracking.
- Nickel alloys Nickel 200, Monel 400, Alloy 600, Alloy 625, Alloy 800, Alloy 825, C-276.
- U-bends and cut lengths for exchanger rebuilds and new bundles.
Case study: duplex U-bends
A Gulf Coast exchanger had cracked three sets of 316L U-bend tube in warm chloride cooling water. Ameritube supplied SA789 duplex 2205 U-bends with controlled bend heat treatment and ferrite verification. The bundle is still in service. Read the full case study in the PDF.
Why chemical plants use Ameritube
- The copper-nickel is drawn and tested here, so lead time is measured in weeks.
- We have seen the failure modes and will steer you off the wrong alloy before you buy it.
- One supplier for the whole corrosion ladder, one documentation format, one phone number.
What to include in your RFQAlloy, OD, wall, length or U-bend schedule, quantity, the process fluid with concentration and temperature, the cooling water chemistry, and any corrosion test (A262, G28, G48) or PMI your specification calls for. If you are not sure which alloy, send the conditions and we will recommend one.