Products Description
ASTM A789 UNS S32750 Duplex Stainless Tube
Advantages of ASTM A789 UNS S32750 Duplex Stainless Tube
- Enhanced Weldability: One of S32750's key advantages over other materials is its weldability. Due to its controlled carbon content and alloying elements, it has a lower risk of hydrogen embrittlement and weld cracking compared to some other super-duplex stainless steels.
- Oxidation Resistance: S32750 maintains its oxidation resistance at elevated temperatures, ensuring the material does not degrade or lose integrity when exposed to high temperatures. This makes it suitable for applications such as heat exchangers, reactors, and furnace components.
- Cost-Effectiveness: While S32750 has a higher initial cost compared to standard 304 or 316 stainless steels, its excellent corrosion resistance and strength reduce maintenance and extend service life, making it more cost-effective in the long run.
applications of ASTM A789 UNS S32750 Duplex Stainless Tube
- Offshore Oil and Gas Industry: Piping systems, heat exchangers, pressure vessels, etc.
- Marine and Seawater Applications: Seawater cooling systems, construction of offshore structures, propellers, rudders, and underwater equipment, etc.
- Chemical and Petrochemical Industry: Chemical reactors, piping and tubing systems, heat exchangers, etc.
- Power Generation Industry: Cooling systems, water supply systems, steam systems, etc.
Chemical Composition
| Element | Cr | Ni | Mo | Mn | Si | C | P | S |
| S32750 | 24.0-26.0% | 6.0-8.0% | 3.0-4.0% | 1.2% | 0.5% | 0.03% | 0.04% | 0.02% |
| S32003 | 21.0-23.0% | 4.5-6.0% | 0.5-2.5% | 1.5% | 0.5% | 0.03% | 0.04% | 0.02% |
| S82011 | 23.0-25.0% | 5.5-7.5% | 2.5-3.5% | 1.5% | 0.5% | 0.03% | 0.04% | 0.02% |
| S39274 | 25.0-27.0% | 6.0-7.0% | 2.0-3.0% | 1.0% | 0.5% | 0.03% | 0.04% | 0.02% |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) | Impact Toughness (J) |
| S32750 | 550-750 | 450-600 | 25-40 | 90-95 | >80 |
| S32003 | 500-700 | 400-500 | 20-35 | 85-90 | >70 |
| S82011 | 520-730 | 420-550 | 22-38 | 85-90 | >75 |
| S39274 | 600-800 | 500-650 | 20-30 | 90-100 | >85 |
Possible Alternative Grades
- UNS S31803 (2205): Another widely used duplex stainless steel grade with good corrosion resistance and strength, but with a lower alloy content than the superduplex grades.
- UNS S32760 (superduplex): Similar to S32750, but with slightly higher corrosion resistance in corrosive environments.
- UNS S32205: A low-cost alternative to S32750 with good corrosion resistance for less aggressive environments.
- 904L: A high-alloy austenitic stainless steel that can be used as an alternative where high corrosion resistance is required, although it is not as strong as duplex steel.
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