Description Of Super Duplex S32750 Tubing Super Duplex S32750 Tubing is a popular choice among various industries because of its high resistance to pitting, stress corrosion cracking, and crevice corrosion. The tubing is composed of a mixture of chromium and molybdenum, which gives it excellent strength and resistance to corrosion from organic acids. In addition, its duplex structure offers good resistance to pitting and chloride stress corrosion cracking.