Duplex alloy 2507 (S32750) is a widely used super duplex stainless steel. Many international equivalents are available commercially including EN/DIN 1.4410 (X2CrNiMoN25-7-4), JIS SUS 329 J4L, China's GB 022Cr25Ni7Mo4N, KS STS 329 J4L, as well as AF 2507, UR 2507, NAS 74N, SAF 2507.