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2205 duplex stainless steel is unique in its dual-phase structure-composed of austenite and ferrite in a nearly 50:50 ratio. In contrast, 304 stainless steel is typically a single-phase austenitic structure, containing 18% chromium, 8% nickel, and no molybdenum or nitrogen. This difference directly leads to differences in mechanical properties and corrosion resistance between the two.
Stainless steel 2205 pipe and s304 pipe supplier
HT PIPE is a reputable supplier and exporter. Our inventory includes asme sa 790 2205 pipes, 304 stainless steel pipe, plates, bars, alongside high-quality fittings, flanges, and fasteners. Reach out today for competitive pricing and detailed specifications-no obligation, just expert support.
2205 vs 304 Stainless Steel chemical composition
| Element | 2205 Duplex Steel | 304 Stainless Steel |
|---|---|---|
| Cr (Chromium) | 22.0-23.0 | 17.5-19.5 |
| Ni (Nickel) | 4.5-6.5 | 8.0-10.5 |
| Mo (Molybdenum) | 2.9-3.5 | 0 |
| N (Nitrogen) | 0.14-0.20 | 0 |
| Mn (Manganese) | ≤2.0 | ≤2.0 |
| C (Carbon) | ≤0.030 | ≤0.080 |
| PREN Value | 35.4 | 18.4 |
uns s32205 and uns s30400 pipe Mechanical Properties
| Property | 2205 Duplex Steel | 304 Stainless Steel |
|---|---|---|
| Yield Strength (MPa) | 450-640 | 170-205 |
| Tensile Strength (MPa) | 620-782 | 485-515 |
| Elongation (%) | 25 | 40-50 |
| Hardness (HV) | 290-320 | 150-200 |
| Impact Toughness (J/cm²) | 100 (20℃) | 220 (20℃) |
| Strength/Density Ratio | 82.1 | 24.6 |
stainless steel 2205 and 304 stainless steel pipe Chloride Environments
ss2205 has an overwhelming advantage in chloride-containing media, with its pitting resistance equivalent (PREN=35.4) far exceeding that of 304 (PREN=18.4). In a 40% CaCl₂ solution tested at 100°C, 2205 exhibited stress corrosion cracking resistance of >1,000 hours, while 304 failed in just 47 hours. In seawater environments, 304 is susceptible to pitting and crevice corrosion, while 2205 exhibits long-term stability.
ss2205 and ss304 Acidic Media
Tests in a 20% H₂SO₄ solution at 60°C showed that the corrosion rate of 2205 was only 0.021 g/(m²·h), while that of 304 was as high as 57. g/(m²·h). This makes 2205 an ideal choice for chemical media such as acetic acid and formic acid.
s32205 and s30400 Localized Corrosion Types
2205 outperforms 304 in terms of resistance to intergranular corrosion, wear corrosion, and fatigue corrosion. Especially in sulfur-containing oil and gas fields (where H₂S/CO₂ coexist), its corrosion rate is much lower than that of carbon steel.
