2205 and 2507 are two common duplex stainless steels, which have different chemical compositions, mechanical properties and corrosion resistance, and are suitable for different application scenarios. The following is a detailed comparison of 2205 and 2507 duplex stainless steel:
1. chemical composition
| elemental | 2205 (% wt) | 2507 (% wt) |
|---|---|---|
| Carbon (C) | ≤ 0.03 | ≤ 0.03 |
| Chromium (Cr) | 22.0 – 23.0 | 24.0 – 26.0 |
| Nickel (Ni) | 4.5 – 6.5 | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 3.5 | 3.0 – 5.0 |
| Manganese (Mn) | ≤ 2.0 | ≤ 1.2 |
| Silicon (Si) | ≤ 1.0 | ≤ 0.8 |
| Nitrogen (N) | 0.14 – 0.20 | 0.24 – 0.32 |
The main difference::
- 2507The higher chromium, nickel and molybdenum content makes it superior to 2205 in terms of corrosion resistance and strength.
- 2507The nitrogen content is also higher, which further enhances its resistance to pitting and crevice corrosion.
2. mechanical property
| Performance Parameters | 2205 | 2507 |
|---|---|---|
| Tensile Strength (MPa) | 620 – 850 | 795 – 1000 |
| Yield strength (MPa) | ≥ 450 | ≥ 550 |
| Elongation (%) | ≥ 25 | ≥ 15 |
| Hardness (HB) | 290 max | 310 max |
The main difference::
- 2507Has higher tensile and yield strengths, meaning it performs better in applications where higher strengths are required.
- 2205The ductility is better for applications that require more deformation capacity.
3. Corrosion resistance
| Performance Parameters | 2205 | 2507 |
|---|---|---|
| Critical Pitting Temperature (°C) | 30 – 50 | 35 – 70 |
| Resistant to chloride stress corrosion cracking | first-rate | outstandingly good |
| Resistant to crevice corrosion | favorable | better |
The main difference::
- 2507Corrosion resistance in chloride-containing environments is superior to 2205, especially at higher chloride concentrations.
- 2507The critical pitting temperature (CPT) is higher, which means it resists pitting even at higher temperatures.
4. application scenario
- 2205Duplex stainless steel is commonly used in chemical processing, the oil and gas industry, the paper industry, and marine applications where it provides good corrosion resistance and mechanical properties.
- 2507Duplex stainless steels are widely used in offshore platforms, seawater treatment equipment, desalination equipment, and chemical handling equipment requiring extremely high corrosion resistance due to their higher strength and corrosion resistance.
summarize
- 2205Duplex stainless steel is an economical duplex steel suitable for most moderately corrosive environments and mechanical strength requirements.
- 2507Duplex stainless steels are suitable for use in more demanding environments due to their excellent corrosion resistance and mechanical strength, especially for applications with high chlorides and high temperatures.
When choosing whether to use 2205 or 2507, the decision needs to be based on specific environmental conditions and engineering requirements. For extreme corrosive environments or where higher strength is required, 2507 would be a better choice; whereas in most conventional applications, 2205 can already provide sufficient performance.
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