UNS S32750 (Super Duplex 2507) Stainless Steel: High-Strength Corrosion-Resistant Alloy

Mechanical and Physical Properties

Super duplex 1.4410 offers approximately twice the yield strength of common 300‑series stainless steels. The material is supplied in solution‑annealed condition, providing high toughness and good impact resistance down to sub‑zero temperatures. Typical properties are summarised below using values from bar and plate products.

Property (room temperature)	Typical value
Density	7.8 – 7.9 g/cm³
Melting point	1350 – 1450 °C
Thermal conductivity	~13.5 W/m·K
Coefficient of thermal expansion	13 – 14 × 10⁻⁶ /K (20–200 °C)
Yield strength Rp0.2	≥ 550 MPa (bars and plates)
Tensile strength Rm	750 – 1000 MPa
Elongation	≥ 25 %
Hardness	≤ 300 HB (≤ 32 HRC)
Impact toughness	≥ 45 J at –46 °C

These high mechanical properties enable lighter constructions and improved safety factors compared with standard duplex grades. For instance, 1.4410 offers yield strengths around 550 MPa compared with ~450 MPa for grade 2205 (1.4462), enabling thinner wall sections without sacrificing strength.