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ASME SA789/ASTM A789 S32750 Duplex Steel Seamless Tube for Heat Exchanger, Chemical Application
ASME SA798/ASTM A789 specifies the dimensional tolerances, process requirements, and testing methods for seamless and welded duplex stainless steel pipes. The common specifications under this standard are an outer diameter range of 6-1200 mm and a wall thickness of 0.5-50 mm. Large caliber or thick walled pipes can be customized. Its testing requirements include hydrostatic testing, non-destructive testing (UT/RT), intergranular corrosion testing (according to standard ASTM A262), etc.
ASTM A789 S32750 (UNS S327502507 duplex steel) is a high-performance super duplex stainless steel tube that combines the advantages of austenite and ferrite duplex structures, with excellent corrosion resistance, high strength, and good processability. The chemical composition of S32750 is mainly chromium (Cr): 24-26%, nickel (Ni): 6-8%, molybdenum (Mo): 3-4%, nitrogen (N): 0.24-0.32%, manganese (Mn): ≤ 1.2%, carbon (C): ≤ 0.03%.
ASTM A789 S32750 Duplex Steel Heat Exchanger Tube Chemical Composition
| UNS GRA. | ASTM A789 S32750 DUPLEX STEEL CHEMICAL COMPOSITION % MAXIMUM | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C | MN | P | S | SI | CR | NI | MO | CU | N | |
| S32750 | 0.03 | 1.2 | 0.035 | 0.02 | 0.8 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.5 | 0.24-0.32 |
ASTM A789 S32750 Duplex Steel Seamless Heat Exchanger Tube Mechanical Properties
| GRADE | Tensile Strength, min ksi [MPa] | Yield Strength, min ksi [MPa] |
|---|---|---|
| S32750 | 116 [800] | 80 [550] |
ASTM A789 S32750 Duplex Steel Advantage comparison:
ASTM A789 S32750 Duplex Steel Seamless Tube Core application areas:
(1) Severe corrosive environment
Marine engineering: high-pressure pipelines for seawater desalination, subsea oil pipelines, and ship cooling systems.
Oil and gas industry: oil and gas well pipelines with high H ₂ S/CO ₂ content, and gathering and transportation pipelines in acidic environments.
Chemical equipment: reactors, heat exchangers, and valves for concentrated hydrochloric acid and chloride containing ion media.
(2) High stress scenario
High pressure heat exchange tube: resistant to corrosion and deformation under high temperature (≤ 300 ℃) and high pressure.
Structural support components: offshore platform supports, load-bearing parts of chemical equipment, utilizing high yield strength to reduce material usage.
(3) Special industrial needs
Pulp and paper: High temperature chlorate medium pipeline in bleaching section.
Flue gas desulfurization (FGD): Spray pipes and flues for wet flue gas desulfurization systems in coal-fired power plants.
Nuclear power plant: corrosion-resistant pipelines for seawater circulation cooling system.
