Advantages of Nickel-based Alloys over Ordinary Duplex Steels

1. Corrosion resistance

Nickel-based alloy: Excellent performance in high temperature, high pressure and strong corrosion environments, especially resistance to oxidation, reduction and stress corrosion cracking.

Duplex steel: Corrosion resistance is good, but not as good as nickel-based alloys under extreme conditions.

2. High temperature performance

Nickel-based alloys: Maintain high strength, oxidation resistance and creep resistance at high temperatures, suitable for high temperature environments.

Duplex steel: strength and oxidation resistance decrease at high temperatures, and the applicable temperature range is narrow.

3. Mechanical properties

Nickel-based alloy: Both high strength and high toughness, excellent fatigue and impact resistance.

Duplex steel: higher strength, but toughness and fatigue resistance than nickel-based alloys.

4. Processing performance

Nickel-based alloy: processing is difficult, requiring special equipment and technology.

Duplex steel: processing is relatively easy, welding and forming performance is good.

5. Cost

Nickel-based alloys: High cost, suitable for high-end applications.

Duplex steel: Low cost, suitable for conventional applications.

6. Application field

Nickel-based alloy: widely used in aerospace, chemical, energy and other high-end fields.

Duplex steel: used in petrochemical, shipbuilding, construction and other conventional fields.

Nickel-based alloy is superior to duplex steel in corrosion resistance, high temperature and mechanical properties, but it is expensive and difficult to process. Duplex steel has more advantages in cost and processability. The selection of materials must be determined according to the specific requirements and application environment.