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2205 vs 2507
The comparison between 2507 and 2205 refers to two different types of duplex stainless steels. Both are designed for high-strength and corrosion-resistant applications, but they have different compositions and are suited for different environments. Here’s how they differ:
1. Composition:
2507 (Super Duplex Stainless Steel):
Chromium: ~25%
Nickel: ~7%
Molybdenum: ~4%
Iron: Balance
Contains higher levels of chromium, nickel, and molybdenum compared to 2205, giving it excellent resistance to corrosion, especially in chloride-rich environments.
2205 (Duplex Stainless Steel):
Chromium: 22%
Nickel: 5-6%
Molybdenum: 3%
Iron: Balance
While it still has a good balance of chromium, nickel, and molybdenum, its corrosion resistance is not as high as 2507’s, but still superior to many other types of stainless steel.
2. Corrosion Resistance:
2507:
Superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), especially in marine environments, chemical processing, and seawater applications. It's highly resistant to chloride-induced corrosion.
Due to its higher molybdenum content, it’s ideal for applications involving harsh chemicals, acids, or saltwater exposure.
2205:
Good corrosion resistance in moderate to highly corrosive environments, particularly in saltwater or marine environments, but not as resistant to extreme conditions as 2507.
It resists pitting and crevice corrosion well, though it may be susceptible to SCC in environments with high chloride levels at elevated temperatures (compared to 2507).
3. Mechanical Properties:
2507:
It has a higher tensile strength (around 100-130 ksi or 690-895 MPa) and yield strength, making it a stronger material for applications that require both high strength and excellent corrosion resistance.
It’s suitable for high-pressure applications.
2205:
Slightly lower tensile strength (around 80-110 ksi or 550-760 MPa) compared to 2507, but still much stronger than standard austenitic stainless steels like 304 or 316.
It offers a good balance between strength and corrosion resistance, making it a versatile material for a range of industries.
4. Applications:
2507:
Used in more extreme environments where both corrosion resistance and high strength are crucial.
Common in chemical processing, offshore oil & gas, marine environments, heat exchangers, and desalination plants.
2205:
Suitable for moderately aggressive environments like pulp and paper processing, chemical industries, and oil & gas production.
Common in structural applications, storage tanks, and marine environments where moderate corrosion resistance is required.
5. Cost:
2507:
More expensive due to its higher alloy content, particularly its molybdenum, which adds to its corrosion resistance.
2205:
Less expensive than 2507, making it a more cost-effective choice when extreme corrosion resistance isn’t required.
In summary:
2507 is a super duplex stainless steel that excels in highly corrosive environments and offers higher strength, but comes at a higher cost.
2205 is a duplex stainless steel with good corrosion resistance and high strength, suitable for most applications, but not as extreme as 2507.
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