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Difference Between S32550 and S32205
When it comes to choosing the right material for your project, it is important to understand the differences between various types of stainless steels. Two commonly used duplex stainless steels are S32550 and S32205. In this article, we will explore the differences between these two materials in terms of their chemical composition, mechanical properties, and applications.
Chemical Composition
S32550, also known as 25Cr-6Ni-3Mo-N and Ferralium 255, is a super duplex stainless steel with high strength and corrosion resistance. It contains 24-26% chromium, 5.5-7.5% nickel, 2.9-3.9% molybdenum, and 0.2-0.35% nitrogen. 1.4507 Stainless Steel also has small amounts of copper, tungsten, and silicon.
S32205, also known as 2205 and 1.4462 stainless steel, is a duplex stainless steel with good corrosion resistance and high strength. It contains 22-23% chromium, 4.5-6.5% nickel, 3-3.5% molybdenum, and 0.14-0.20% nitrogen.
From the chemical composition, we can see that S32550 has higher amounts of chromium, nickel, and molybdenum than S32205. It also has nitrogen added to its composition, which enhances its strength and corrosion resistance.
Chemical Composition Comparison
| Element | S32205 (Duplex 2205) | S32550 (Ferralium 255) |
| Chromium (Cr) | 22.0 – 23.0% | 24.0 – 27.0% |
| Nickel (Ni) | 4.5 – 6.5% | 4.5 – 6.5% |
| Molybdenum (Mo) | 3.0 – 3.5% | 2.9 – 3.9% |
| Copper (Cu) | - | 1.5 – 2.5% |
| Nitrogen (N) | 0.14 – 0.20% | 0.10 – 0.25% |
Mechanical Properties
- Yield Strength: S32550 has a yield strength of at least 550 MPa, while S32205 has a yield strength of at least 420 MPa.
- Tensile Strength: Super Duplex UNS S32550 has a tensile strength of at least 800 MPa, while duplex S32205 has a tensile strength of at least 620 MPa.
- Elongation: S32550 Stainless Steel Pipe has an elongation of at least 25%, while S32205 has an elongation of at least 25%.
From the above comparison, we can see that S32550 has higher yield and tensile strength than S32205. This makes it suitable for applications that require high strength and toughness, such as in the oil and gas industry.
Applications
However, because of their differences in chemical composition and mechanical properties, they are better suited for different applications.
- S32550 is commonly used in the chemical processing, oil and gas, and pulp and paper industries, where it can withstand harsh environments and corrosive chemicals. It is also used in marine applications because of its high resistance to corrosion in seawater.
- Duplex 2205 pipe is commonly used in the construction, food processing, and water treatment industries. Its high strength and corrosion resistance make it ideal for applications such as pipes, valves, and fittings.
Summary FAQ
Q: Is S32550 more expensive than S32205?
A: Yes, due to the higher alloy content (Chromium/Moly) and the specialized manufacturing process, Super Duplex S32550 carries a premium price but offers a much longer service life in harsh conditions.
Q: Can S32550 replace S32750 (2507)?
A: In many acidic environments, yes. S32550 (Ferralium 255) often outperforms S32750 in acids because of its copper content, though S32750 is more common for standard seawater applications.
