Duplex 2205 vs 2507: PREN and strength class

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2205 · 2507 · duplex · PREN · selection

2205 (PREN≈34–36) covers most high-chloride duties; 2507 (PREN≈42–43) offers higher corrosion resistance and strength for seawater and oil & gas.

2205 (S32205/S31803) and 2507 (S32750) are the common duplex stainless steels. Selection depends on how severe the corrosion is and the required strength:

| Item | 2205 | 2507 |
|---|---|---|
| PREN | about 34–36 | about 42–43 |
| Yield strength | ≥450 MPa | ≥550 MPa |
| Chloride/crevice resistance | good | better |
| Typical use | chemical tanks, FGD, seawater piping | desalination, oil & gas, deep sea |
| Processing/welding | mature | narrower window, qualification needed |

Guidance:

1) For general high-chloride service (cooling water, FGD), 2205 is usually sufficient.
2) For high temperature + high chloride, severe crevices or longer life, choose 2507.
3) 2507 demands tighter welding and forming control, with WPS/PQR and ferrite content control.
4) Do not move to 2507 blindly on cost-sensitive projects; assess measured medium data first.

The key with duplex is the ferrite/austenite balance: cooling rate and heat input after welding affect life more than the grade selection alone.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。

Duplex 2205 vs 2507: PREN and strength class

2205 (PREN≈34–36) covers most high-chloride duties; 2507 (PREN≈42–43) offers higher corrosion resistance and strength for seawater and oil & gas.

2205 (S32205/S31803) and 2507 (S32750) are the common duplex stainless steels. Selection depends on how severe the corrosion is and the required strength:

| Item | 2205 | 2507 |
|---|---|---|
| PREN | about 34–36 | about 42–43 |
| Yield strength | ≥450 MPa | ≥550 MPa |
| Chloride/crevice resistance | good | better |
| Typical use | chemical tanks, FGD, seawater piping | desalination, oil & gas, deep sea |
| Processing/welding | mature | narrower window, qualification needed |

Guidance:

1) For general high-chloride service (cooling water, FGD), 2205 is usually sufficient.
2) For high temperature + high chloride, severe crevices or longer life, choose 2507.
3) 2507 demands tighter welding and forming control, with WPS/PQR and ferrite content control.
4) Do not move to 2507 blindly on cost-sensitive projects; assess measured medium data first.

The key with duplex is the ferrite/austenite balance: cooling rate and heat input after welding affect life more than the grade selection alone.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。