High Corrosion Resistance

Excellent Pitting Resistance

Relation between critical pitting temperature (CPT) and pitting resistance equivalent Number (PREN) in 6%FeCl3 solution (JIS G 0578)
PREN=Cr%+3.3xMo%+16xN%

The higher the “PREN value” of steel, which are indicators of Cr, Mo, and N, the better the pitting resistance.

A comparison of the pitting resistance of various types of steel is shown below.
SUS304≤S32101
SUS316L≤S32304
SUS329J4L≈NSSC170
S32750≈NSSC270

Excellent SCC Resistance

Influence of Cl- concentration and temperature on stress corrosion cracking of duplex stainless steels and Type 316L. (Double U bend specimens, aerated, 500hr)

Duplex stainless steel has excellent stress corrosion cracking resistance (SCC resistance) in a chloride environment. The limit temperature of SCC for S31803 and SUS329J4L is higher than that of austenitic Type316L.