2507 Duplex Steel vs. 317LMN stainless steel
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2507 Duplex Steel vs. 317LMN Stainless Steel pipe: Which Is Better for Your Application?
When it comes to selecting a corrosion-resistant alloy for harsh environments, engineers often compare 2507 super duplex stainless steel317LMN (EN 1.4439 / X2CrNiMoN17-13-5) austenitic stainless steel. Both are high-alloy materials designed for critical applications-but they differ in structure, performance, and cost.
Duplex 2507 vs 317LMN Austenitic stainless steel pipe
| 2507 Duplex Steel | 317LMN Stainless Steel (1.4439) | |
|---|---|---|
| Duplex (50% Ferrite + 50% Austenite) | ||
| S32750 | S31726 | |
| 1.4410 | 1.4439 |
317LMN vs 2507: Chemical Composition Comparison
317LMN has higher Ni & Mo, while 2507 has more Cr & N, resulting in superior strength and localized corrosion resistance.
| 2507 (S32750) | 317LMN (1.4439) | |
|---|---|---|
| 24.0–26.0% | 16.5–18.5% | |
| 6.0–8.0% | 12.5–14.5% | |
| 3.0–5.0% | 4.5–5.5% | |
| 0.24–0.32% | 0.10–0.16% | |
| <= 0.030% | <= 0.030% |
2507 vs 317LMN stainless pipe: which one to choose?
317LMN SS Round Pipe offers excellent resistance to pitting, crevice corrosion, and acid attack, especially in chloride-rich environments like seawater, chemical tanks, and evaporators.
2507 SS Round Pipe provides even better pitting resistance, with a PREN value of 42–45, versus ~38–42 for 317LMN. It's especially effective in high-pressure/high-temperature seawater and FGD systems.
Is 2507 duplex steel stronger than 317LMN?
2507 offers more than twice the yield strength of 317LMN, making it the better choice for high-load structural components.
| 2507 Duplex | 317LMN Austenitic | |
|---|---|---|
| ~550 MPa | ~240 MPa | |
| ~800 MPa | 540–750 MPa | |
| >=25% | >=40% | |
| <= 310 | <= 220 |
What is the price of 2507 stainless steel pipe?
2507 tends to be more expensive per kg, but due to its high strength, thinner walls may be used, reducing material volume,317LMN is more cost-effective for corrosion resistance when high strength is not required.
Which is better: 317LMN or 2507 for seawater use?
Choose 2507 duplex stainless steel pipe when superior strength, high chloride resistance, and structural performance are critical-especially in offshore, marine, and oil & gas applications.
Choose 317LMN stainless steel pipe when you need excellent corrosion resistance to acids, easier fabrication, and reliable performance in non-structural chemical environments.
Need Help Selecting Between 2507 and 317LMN?
We offer both 317LMN (EN 1.4439) and 2507 (EN 1.4410) in seamless/welded pipe, sheet, bar, and tube, with MTC certificates, global shipping, and expert technical support. Contact us now to get a quote or material recommendation based on your application.
