The corrosion resistance properties of UNS S32570 (2507) and 1.4410 stainless steel structural profiles differ due to slightly different chemical compositions.

Compared to 1.4410, 2507 has higher chromium (24-26%) and molybdenum (3-4%) content.
The high chromium and molybdenum content in 2507 provides excellent resistance to pitting, crevice and stress corrosion cracking.
2507 has excellent resistance to a variety of corrosive environments, including seawater, chlorides, acids and other chemicals commonly found in water treatment processes.
The excellent corrosion resistance of 2507 makes it ideal for use in harsh corrosive environments such as desalination plants, wastewater treatment facilities and coastal/offshore applications.

1.4410 also exhibits excellent corrosion resistance, but its chromium (24-26%) and molybdenum (2.5-3.5%) content is slightly lower than 2507.
While 1.4410 has excellent corrosion resistance, it may be slightly more susceptible to pitting and crevice corrosion in environments with high chlorine content than 2507.
1.4410 is still considered a highly corrosion-resistant stainless steel suitable for many water treatment applications, but it may not provide the same level of protection as 2507 in the most corrosive, chloride-rich conditions.

In neutral, chloride-containing solutions such as seawater, 2507 has a higher critical pitting temperature (CPT) and critical crevice corrosion temperature (CCT) than 1.4410, demonstrating excellent resistance to localized corrosion.
2507 also exhibits better resistance to stress corrosion cracking in acidic, chlorine-containing environments compared to 1.4410.
The higher molybdenum content of 2507 helps increase its resistance to localized corrosion and stress corrosion cracking.

Desalination plants with structural components exposed to high salinity salt water and seawater
Wastewater treatment facilities whose structural elements may be exposed to aggressive chemicals and corrosive environments
Coastal and offshore water treatment infrastructure whose components are continuously exposed to seawater and chlorides

The enhanced corrosion resistance of 2507 helps extend the service life of structural profiles, reduce maintenance needs, and ensure the long-term integrity of water treatment systems.