What is uns S32750 material?
UNS S32750 is the Unified Numbering System designation for Super Duplex Stainless Steel 2507, a high-performance alloy known for combining the strength of ferritic steels with the corrosion resistance of austenitic steels, featuring high chromium (25%), molybdenum (4%), and nitrogen (0.24-0.32%) for superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking (SCC), making it ideal for harsh environments in oil & gas, chemical processing, and marine industries.
What is the ASTM equivalent of uns S32750 material?
UNS S32750 is a Super Duplex Stainless Steel, commonly known as ASTM A182 F53 or SAF2507, and is found in various ASTM standards like A240 (plate), A479 (bar/fasteners), A790 (pipe), and A890/A995 (castings), all referring to the same 25Cr-7Ni-Mo-N composition offering high strength and chloride resistance.
uns S32750 stianless steel Chemical Composition
| Element | Content (%) |
|---|---|
| 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 |
| Nitrogen, N | 0.24 – 0.32 |
| Phosphorous, P | 0.035 max |
| Carbon, C | 0.030 max |
| Sulfur, S | 0.020 max |
| Iron, Fe | Balance |
uns S32750 stainless steel Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.8 g/cm3 | 0.281 lb/in3 |
| Melting point | 1350°C | 2460°F |
UNS S32750 material Corrosion Resistance
UNS S32750 is a super duplex stainless steel with a chemical composition of 24-26% Cr, 6-8% Ni, 3-5% Mo, and 0.24-0.32% N. It has a pitting resistance equivalent number (PREN) of 40-48 and exhibits excellent resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking in highly corrosive environments such as offshore oil and gas platforms, chemical plants, and seawater systems.
UNS S32750 material Strength
UNS S32750 super duplex stainless steel has a minimum yield strength of 550 MPa (80 ksi), a tensile strength of 795-1035 MPa (115-150 ksi), and an elongation of ≥20%. Its yield strength is 2-3 times that of standard austenitic stainless steels such as 316L, while maintaining excellent toughness at temperatures as low as -50°C.
UNS S32750 Stainless Steel Thermal Properties
UNS S32750 has a coefficient of thermal expansion of 12.8 × 10⁻⁶/°C (7.1 × 10⁻⁶/°F) in the 20-100°C range, a thermal conductivity of 15.1 W/(m·K) at 20°C, and a maximum continuous service temperature of 300°C (572°F). Above this temperature, its duplex microstructure begins to become unstable.
UNS S32750 Stainless Steel Applications
Due to its perfect combination of high strength and excellent corrosion resistance, UNS S32750 super duplex stainless steel is widely used in critical components, including offshore pipeline systems, desalination equipment, chemical reaction vessels, and sour gas processing equipment.
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