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UNS S32750 super duplex steel consists of 25% chromium, 4% molybdenum and 7% nickel. It has high strength and corrosion resistance and is mainly used in chemical processing, petrochemical and subsea equipment. It has strong resistance to chloride corrosion, high thermal conductivity and low thermal expansion coefficient. The high chromium, molybdenum and nitrogen content makes it highly resistant to pitting, crevice and uniform corrosion. The grade standard of S32750 is as follows:
Standard | UNS S32750 | DIN/EN 1.4410 | ASTM A240/SA240M |
Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Ni | Cr | Mo | N | Cu≤ |
S32750 | 0.03 | 1.20 | 0.035 | 0.02 | 0.80 | 6.0-8.0 | 24.0-26.0 | 3.0-5.0 | 0.24-0.32 | 0.5 |
Grade | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB（max） |
S32750 | 116 [795] | 80 [550] | 15 | 310 |
Corrosion resistance: The high chromium and molybdenum content in S32750 makes it have strong overall corrosion resistance to organic acids such as formic acid and acetic acid. Compared with 904L, SAF2507 has stronger corrosion resistance.
Heat treatment ability: S32750 should be solution annealed and quenched after hot or cold forming. The temperature of solution annealing should not be lower than 1052°C, and air or water cooling quenching should be performed immediately afterwards.
Welding performance: S32750 has good weldability and can be welded by the following methods: SMAW, GTAW, PAW, FCW, SAW.
Density (Kg/m3) | 7810 |
Magnetic Permeability (20°C) | 33 |
Young’s Modulus (kN/mm2) | 199 |
Specific Electrical Resistance, 20°C (µΩ.m) | 0.8 |
Mean coefficient of thermal expansion, 20-300°C (m/m/oC) | 11.1 x 10-6 |
Specific Heat, 20°C (J/kg.K) | 475 |
Thermal conductivity, 20°C (W/m.K) | 14.2 |
STANDARD | WERKSTOFF NR. | UNS | EN |
Super Duplex S32750 | 1.4410 | S32750 | X2CrNiMoN25-7-4 |
Product | Standard | Show |
Pipe SMLS & Welded | ASTM A790/A928 |  |
Tube SMLS & Welded | ASTM A789 |  |
Sheet / Plate | ASTM A240 |  |
Bar / Rod | ASTM A276/A479 |  |
Forging / Flange | ASTM A182 |  |
BW Fittings | ASTM A815 |  |
Oil and gas industry equipment
Offshore platforms, heat exchangers, underwater equipment, fire-fighting equipment
Chemical processing industry, pipeline
Desalination plants, high pressure reverse osmosis plants and subsea pipelines
Mechanical parts (high-strength, corrosion-resistant parts)
Energy industry FGD system, industrial washing system, absorption tower
