Chemical Composition
Its corrosion resistance is due to its unique composition.
| Ni | Cr | Mo | Cu | Mn | Si | C | P | S | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 30-32% | 26-28% | 3-4% | 0.6-1.4% | ≤2% | ≤1% | ≤0.02% | ≤0.03% | ≤0.01% | Balance |
These elements ensure that it performs well in media rich in sulfur, phosphorus and chlorides.
Mechanical Properties
It has strong mechanical properties and is suitable for harsh conditions. Key metrics include:
- Tensile Strength (Rm): 500-750 MPa
- Yield Strength (Rp0.2): ≥220 MPa
- Elongation (A): ≥35%
- Hardness (HB): ≤230
These traits make it ideal for high-pressure chemical equipment.
Corrosion Resistance of Alloy 28
- High chromium and molybdenum fight pitting and crevice corrosion.
- High nickel content boosts stress corrosion cracking resistance.
- It withstands seawater erosion, enhancing equipment durability.
Applications of Alloy 28
- Chemical: Builds corrosion-resistant reactors and pipelines.
- Petrochemical: Handles sulfur and phosphorus media.
- Offshore Technology: Resists seawater corrosion.
- Fertilizer Industry: Supports acid production equipment.
- Environmental Technology: Manages corrosive gases and liquids.
- Flue Gas Desulfurization: Extends system life.
- Pulp and Paper: Tackles chemical corrosion.
Material Standards
- Material Number: 1.4563
- UNS NO.: N08028
- ASTM: B709
- VDTÜV: 483
- DIN EN: 10088-3
Comparison with Other Alloys
Alloy 28 offers superior performance compared to 316L stainless steel, particularly in chloride-rich environments. While 316L contains 16-18% chromium and 2-3% molybdenum, Alloy 28 has 26-28% chromium and 3-4% molybdenum, significantly boosting its resistance to pitting and crevice corrosion. This makes it a preferred material in harsh settings like petrochemical plants and offshore platforms, where chloride exposure is frequent. Additionally, Alloy 28’s higher nickel content (30-32%) compared to 316L’s 10-14% enhances its defense against stress corrosion cracking. These advantages ensure greater reliability and safety in severe conditions, reducing the risk of costly failures.
Future Trends of Alloy 28
The future of Alloy 28 looks promising as demand rises in the chemical and petrochemical industries. With increasing global energy needs, durable materials like Alloy 28 are vital for efficient refineries and processing plants. Its ability to endure extreme conditions positions it well for upcoming projects. Advances in manufacturing, such as precision casting and additive manufacturing, will streamline production, cutting costs and enhancing performance. Additionally, its long lifespan supports sustainability goals by minimizing replacements, making Alloy 28 a forward-thinking choice for high-performance applications.
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