Corrosion Resistant 2507 Globe Valve, A890 5A, API 623, OS&Y, Double Flanged

2507 is a ferritic-austenitic (duplex) stainless steel that combines the most beneficial properties of many ferritic and austenitic steels. Due to the high content of chromium and molybdenum, it has extremely Good resistance to pitting corrosion, crevice corrosion and uniform corrosion. The dual-phase microstructure ensures that the steel has high resistance to stress corrosion cracking and high mechanical strength.

Why 2507 ?

1. Corrosion resistance

The higher chromium and molybdenum content of SAF 2507 makes it more resistant to bulk corrosion of organic acids such as formic acid and acetic acid. SAF 2507 alloy also has strong resistance to inorganic acids, especially those containing chlorides. corrosion resistance.

Compared with 904L, SAF2507 has stronger corrosion resistance to diluted sulfuric acid mixed with chloride ions. 904L is an alloy in the austenitic state, specially designed to resist pure sulfuric acid corrosion.

316L grade can not be used in hydrochloric acid environment, it may be subject to local corrosion or overall corrosion. SAF2507 can be used in dilute hydrochloric acid environment, with strong anti-spot and anti-crevice corrosion ability.

2. Intergranular corrosion

The lower carbon content of SAF 2507 greatly reduces the risk of intergranular carbide precipitation during heat treatment, therefore, this alloy is highly resistant to carbide-related intergranular corrosion.

3. Stress corrosion cracking

The duplex structure of SAF 2507 makes it highly resistant to stress corrosion cracking. Due to its higher alloy content, the corrosion resistance and strength of SAF 2507 are better than 2205.

Cracks are almost inevitable in construction, etc., which makes stainless steel more susceptible to corrosion in chloride environments. SAF 2507 has a strong ability to resist crack corrosion. The isocorrosion curve of SAF 2507 in sulfuric acid containing 2000ppm chloride ions 0.1 mm/year; isocorrosion curve in hydrochloric acid 0.1 mm/year.