What is ASTM A790 UNS S32750 Pipe
ASTM A790 S32750 Super Duplex Stainless Steel Pipe is a type of seamless or welded super duplex stainless steel pipe conforming to the ASTM A790 standard. UNS S32750, also known as Super Duplex 2507, is a ferritic-austenitic duplex stainless steel, possessing excellent mechanical strength, toughness, and corrosion resistance.
This material contains approximately 25% chromium, 7% nickel, and 4% molybdenum, exhibiting excellent resistance to chloride corrosion and effectively resisting pitting corrosion, crevice corrosion, and stress corrosion cracking. Therefore, ASTM A790 S32750 Super Duplex Stainless Steel Pipe is widely used in high-performance applications such as seawater, chemical, offshore oil and gas, and seawater desalination.
Features of Super Duplex Stainless Steel S32750 Pipe
1. Excellent Acid Corrosion Resistance
ASME SA790 UNS S32750 steel pipe contains a high proportion of chromium and molybdenum, thus exhibiting excellent overall corrosion resistance to organic acids such as formic acid and acetic acid. Simultaneously, 2507 also demonstrates strong corrosion resistance to various inorganic acids, especially chloride-containing acidic media. Compared to 316L steel pipe, 2507 exhibits better resistance to localized corrosion and crevice corrosion in dilute hydrochloric acid environments, and its corrosion resistance to mixed media of dilute chlorides and sulfuric acid is also superior to 904L.
2. Excellent Resistance to Stress Corrosion Cracking
The ferrite-austenite duplex structure of S32750 endows it with excellent resistance to stress corrosion cracking. With its high alloy element content, Super Duplex S32750 has significant advantages in both corrosion resistance and strength, making it suitable for applications requiring high material reliability.
3. Excellent Resistance to Intergranular Corrosion
Super duplex S32750 has a low carbon content, effectively reducing the risk of intergranular carbide precipitation during heat treatment, thereby improving the material's resistance to carbide-related intergranular corrosion and enhancing long-term stability.
4. Excellent Mechanical Properties
2507 stainless steel pipe possesses high strength, good impact toughness, a low coefficient of thermal expansion, and high thermal conductivity. Its high strength and hardness enable the steel pipe to withstand high working pressures and provide good wear resistance, helping to extend product service life.
ASTM A790 UNS S32750 Super duplex Pipe Mechanical Characteristics
|
Super Duplex |
speciifcation |
Uns No |
Density (g/cm 3) |
Density (lb/in 3) |
Melting Point (°C) |
Melting Point (°F) |
|
2507 |
A789, A790 |
UNS S32750 |
7.8 |
0.281 |
1350 |
2460 |
Available UNS S32750 Super Duplex Pipe Schedule
|
3 1/2" IPS( 4.000"O. D.) |
1/8" IPS(.405"O. D.) |
|
SCH 40, 10, 160, 80, XXH |
SCH 40, 80 |
|
4" IPS(4.500"O. D.) |
1/4" IPS(.540"O. D.) |
|
SCH 40, 10, 160, 80, XXH |
SCH 40, 10, 80 |
|
5" IPS( 5.563"O. D.) |
3/8" IPS(.675"O. D.) |
|
SCH 40, 10, 160, 80, XXH |
SCH 40, 10, 80 |
|
6" IPS(6.625"O. D.) |
1/2" IPS(.840"O. D.) |
|
SCH 10, 5, 80, 40, 160, 120 XXH |
SCH 5, 40, 10, 160, 80, XXH |
|
8 " IPS(8.625"O. D.) |
3/4" IPS(1.050"O. D.) |
|
SCH 10, 5, 80, 40, 160, 120 XXH |
SCH 40, 10, 160, 80, XXH |
|
10" IPS(10.750"O. D.) |
1" IPS:(1.315′O. D.) |
|
SCH 10, 20, TRUE 80(.500), 40, 80 (.500), |
SCH 5, 40, 10, 160, 80, XXH |
|
12" IPS(12.750"O. D.) |
1-1/4" IPS(1.660"O. D.) |
|
SCH 10, 20, TRUE40(.406), 40(.375), SCH80(.500) |
SCH 40, 10, 160, 80, XXH |
|
14" IPS(14.000"O. D.) |
1-1/2" IPS(1.900"O. D.) |
|
SCH10(.188), SCH40(.375) |
SCH 40, 10, 160, 80, XXH |
|
16" IPS(16.000"O. D.) |
2" IPS(2.375"O. D.) |
|
SCH10(.188), SCH40(.375) |
SCH 40, 10, 160, 80, XXH |
|
18" IPS (18.000"O. D.) |
2 1/2" IPS(2.875"O. D.) |
|
SCH-40 (.375) |
SCH 40, 10, 160, 80, XXH |
|
|
3" IPS( 3.500"O. D.) |
|
|
SCH 5, 40, 10, 160, 80, XXH |
Application of A790 S32750 Pipe
Difference Between UNS S32750 and S32760
|
Property |
UNS S32760 |
UNS S32750 |
|
Composition (Cr, Ni, Mo) |
Ni: 7%, Cr: 25%, Mo: 5% |
Ni: 7%, Cr: 25%, Mo: 4% |
|
Tensile Strength (MPa) |
800-1050 MPa |
750-1000 MPa |
|
Yield Strength (MPa) |
600-750 MPa |
550-700 MPa |
|
Elongation (%) |
25% |
25% |
|
Hardness (HRC) |
30-35 HRC |
30-35 HRC |
|
Impact Toughness |
Superior Toughness Compared to S32750 at Low Temperatures |
at Low Temperatures Good Toughness |
|
Pitting Resistance |
≥ 43 (PREN) |
≥ 40 (PREN) |
|
Applications |
Chemical Processing, Marine, Power Plants, Offshore |
Desalination, Chemical Processing, Heat Exchangers, Offshore |
|
Workability |
Slightly More Resistant to Overstretching Than S32750 |
Moderate |
|
Resistance to Sulfide Stress Corrosion |
Excellent Resistance |
Good Resistance |
Processing Technology of Super Duplex S32750 Stainless Steel Pipes
Super duplex S32750 stainless steel pipes mainly include UNS S32750 seamless steel pipes and welded steel pipes. Common processing technologies include hot rolling, cold drawing, cold working, and welding, with the appropriate technology selected based on product specifications and performance requirements.
Hot Rolling: Heating the steel billet to a suitable temperature and then rolling or extruding it; suitable for producing larger-sized steel pipes.
Cold Drawing: Cold drawing of hot-rolled pipes to improve dimensional accuracy, surface quality, and overall performance.
Cold Working: Further forming, straightening, and cutting according to product requirements to obtain the required dimensions and lengths.
Welding: Producing steel pipes or connecting pipe sections through welding processes to meet the length and structural requirements of different piping systems.
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