S31803/S32205

S31803/S32205, commonly referred to as duplex stainless steel, is a dual-phase stainless steel alloy with a microstructure consisting of approximately equal parts of ferrite and austenite phases. This alloy offers a combination of excellent corrosion resistance, high strength, and good weldability, making it suitable for various applications in aggressive environments. Here is a detailed description of S31803/S32205:

Chemical Composition:

• Chromium (Cr): Approximately 21.0-23.0%

• Nickel (Ni): Approximately 4.5-6.5%

• Molybdenum (Mo): Approximately 2.5-3.5%

• Manganese (Mn): ≤2.0%

• Silicon (Si): ≤1.0%

• Carbon (C): ≤0.030%

• Phosphorus (P): ≤0.030%

• Sulfur (S): ≤0.020%

• Nitrogen (N): Approximately 0.08-0.20%

• Iron (Fe): Balance

Key Features and Characteristics:

1. Corrosion Resistance: S31803/S32205 offers good resistance to general corrosion, as well as localized corrosion phenomena such as pitting and crevice corrosion, in chloride-rich environments. This makes it suitable for use in marine environments, chemical processing, and oil and gas applications.

2. High Strength: The alloy exhibits high strength and toughness, allowing it to withstand mechanical stresses and pressure in various applications, including offshore platforms, subsea pipelines, and structural components.

3. Weldability: S31803/S32205 has good weldability and can be readily welded using common welding techniques, providing ease of fabrication and assembly in various engineering applications.

4. Fatigue Resistance: The alloy demonstrates good fatigue resistance, making it suitable for applications involving cyclic loading and thermal cycling.

5. Duplex Structure: The balanced ferrite-austenite microstructure of S31803/S32205 provides a combination of strength and corrosion resistance, offering advantages over both austenitic and ferritic stainless steels.

6. Cost-Effectiveness: S31803/S32205 offers a cost-effective alternative to higher alloyed materials such as super duplex stainless steels, providing a balance between performance and cost.

Applications:

• Offshore and marine applications including offshore oil platforms, subsea pipelines, and marine equipment

• Chemical processing equipment such as reactors, heat exchangers, and piping systems

• Oil and gas industry components including flowlines, risers, and subsea equipment

• Desalination plants and equipment for seawater processing

• Pulp and paper processing equipment including digesters and bleach plants

• Structural components in construction and architecture

S31803/S32205 (duplex stainless steel) is a versatile and cost-effective alloy suitable for a wide range of applications requiring corrosion resistance, high strength, and good weldability in aggressive environments. Its balanced combination of properties makes it a preferred choice for critical applications across various industries.

Thickness  0.6/0.8/1.0/2.0/5.0