2507 Super Duplex

2507 Super Duplex is a super duplex stainless steel with 25% chromium, 4% molybdenum, and 7% nickel designed for demanding applications which require exceptional strength and corrosion resistance, such as chemical process, petrochemical, and seawater equipment. The steel has excellent resistance to chloride stress corrosion cracking, high thermal conductivity, and a low coefficient of thermal expansion. The high chromium, molybdenum, and nickel levels provide excellent resistance to pitting, crevice, and general corrosion.

UNS: S32750
Stock Sizes: 1/4” – 1” OD


  • Seamless Tube: ASTM A789
  • NACE MR0175/MR0103

Available Processing:

  • Cold Worked and Bright Annealed

Common Testing: Eddy Current, Flare, Flattening, Positive Material Identification

Chemical Composition (%)

Iron (Fe)Balance
Chromium (Cr)24-26%
Nickel (Ni)6-8%
Molybdenum (Mo)3-5%
Manganese (Mn)1.20% Max
Silicon (Si)0.80% Max
Copper (Cu)0.50% Max
Carbon (C)0.030% Max
Sulfur (S)0.020% Max
Phosphorus (P)0.035% Max
Nitrogen (N)0.24-0.32%

Physical Properties

Density (lb/in3)0.280
Elongation (min %)15
Minimum Yield (psi)80,000
Minimum Tensile (psi)116,000
Max Hardness (HRC)32