S32205 VS S31803, they are two duplex stainless steels commonly used in the chemical, marine and petroleum industries. Both have excellent corrosion resistance and high strength. However, subtle differences in their composition and properties separate them. We explore the differences in chemistry, properties and applications in this article to guide you in your selection.
S32205 VS S31803,Chemical Composition
The main difference between the two is the nitrogen and chromium content. S32205 boosts nitrogen content and fine-tunes chromium and molybdenum ratios. Consequently, it enhances corrosion resistance and strength.
| Element | Cr | Ni | Mo | N | Fe |
|---|---|---|---|---|---|
| S31803 (%) | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 | Balance |
| S32205 (%) | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 | Balance |
S32205 VS S31803,Mechanical Properties
S32205 outperforms S31803 in mechanical strength. Its higher nitrogen content improves yield strength and toughness. Plus, S32205 resists fatigue better.
| Property | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| S31803 (%) | ≥450 | ≥620 | ≥25 | ≤293 |
| S32205 (%) | ≥450-500 | ≥655 | ≥25 | ≤310 |
Corrosion Resistance Variations
S32205 excels in chloride-rich environments like seawater. It resists pitting and crevice corrosion more effectively than S31803. Meanwhile, S31803 struggles slightly in acidic conditions. Thus, S32205 suits harsher settings. For example, its PREN (Pitting Resistance Equivalent Number) often exceeds 35, compared to S31803’s 31-35.
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Applications: Where Each Shines
S31803 fits well in standard chemical equipment and pipelines. It balances cost and performance nicely. On the other hand, S32205 thrives in marine engineering and high-pressure systems. Its superior strength and corrosion resistance make it ideal for tougher jobs.
| Application Area | S31803 Preferred | S32205 Preferred |
|---|---|---|
| Chemical Processing | General Pipes | Acidic Environments |
| Marine Engineering | Basic Fittings | Seawater Exposure |
| Oil & Gas | Low-pressure Lines | High-pressure Systems |
S32205 VS S31803,Core Advantages
- Excellent Corrosion Resistance: S31803 effectively resists corrosion in a wide range of acidic environments, extending equipment life.
- High Mechanical Strength: It provides a yield strength of up to 450 MPa, making it suitable for load-bearing structures.
- Cost-effective: S31803 is less expensive than high-alloyed materials and offers balanced performance.
- Excellent Weldability: S31803 supports conventional welding processes and provides processing flexibility.
- Good Fatigue Resistance: it remains stable under cyclic stress, making it suitable for dynamic applications.
- Excellent Pitting Resistance: S32205 significantly resists pitting in chlorinated environments such as seawater.
- Higher Strength: With a tensile strength of over 655 MPa, it outperforms S31803.
- Excellent Crevice Corrosion Resistance: S32205 prevents corrosion in narrow crevices, making it suitable for marine engineering.
- Enhanced Toughness: It maintains toughness at low temperatures and adapts to harsh conditions.
- Resistance To Stress Corrosion Cracking: S32205 effectively resists chloride-induced stress corrosion, safe and reliable.
S32205 VS S31803,Material Standards
- ASTM: Both conform to ASTM A240 and ASTM A479.
- ASME: S31803 and S32205 are listed in ASME SA-240 and SA-479.
- EN: Both follow EN 1.4462, but S32205 has an adjusted nitrogen content.
- ISO: Both follow ISO 15156.
- NACE: S31803 and S32205 comply with NACE MR0175/ISO 15156.
Comparison with Other Alloys
Unlike austenitic stainless steels (e.g., 316LN), S32205 VS S31803 offers higher strength and duplex structure benefits. S32205 edges out S31803 in extreme conditions, making it a step-up choice.
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