ASTM A790 UNS S31803 Duplex stainless steel Pipes ,ASTM A790/A789 UNS S31803 Duplex Steel Seamless Pipes
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ASTM A790 S31803 is a specification for seamless and welded ferritic/austenitic stainless steel pipes. This grade of stainless steel, also known as duplex stainless steel, offers excellent corrosion resistance, high strength, and good weldability, making it suitable for a wide range of applications in various industries.
A790 S31803 pipes are made from a duplex stainless steel alloy, which consists of a balanced mixture of ferritic and austenitic phases. This unique microstructure provides the pipes with a combination of high strength and corrosion resistance.
UNS S31803, 1.4462 duplex stainless steel is designed to combine improved resistance to stress corrosion cracking, pitting, crevice corrosion and high strength when compared with other stainless alloys
ASME SA789/SA789M ( ASTMA789/A789M )
General use standard specification for seamless and Welded Ferritic / austenitic stainless steel tube
A 790A 790M Seamless and Welded Ferritic Austenitic Stainless Steel tube
The Pipe Sizes & Schedules availability for ASTM A790 S31803 Pipe
Pipe Sizes:
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Seamless Pipe: ½” – 24”
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Welded Pipe: 6” – 60”
Schedules:
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SCH 10, SCH 40, SCH 80, SCH 160, XXS
Duplex stainless steels are extremely corrosion resistant, work hardenable alloys. Their microstructures consist of a mixture of austenite and ferrite phases. As a result, duplex stainless steels display properties characteristic of both austenitic and ferritic stainless steels. This combination of properties can mean some compromise when compared with pure austenitic and pure ferritic grades.
Duplex stainless steels are in most cases, tougher than ferritic stainless steels. Strengths of duplex stainless steels can in some cases be double that for austenitic stainless steels.
The duplex stainless steels are considered resistant to stress corrosion cracking, they are not as resistant to this form of attack as ferritic stainless steels. However, the corrosion resistance of the least resistant duplex stainless steels is greater than that for the most commonly used grades of stainless steels, i.e. 304 and 316.
Duplex stainless steels are also magnetic, a property that can be used to easily differentiate them from common austenitic grades of stainless.
Property data given in this document is typical for flat rolled products covered by ASTM A240/A240M. ASTM, EN or other standards may cover products sold. It is reasonable to expect specifications in these standards to be similar but not necessarily identical to those given in this datasheet.
ASTM A790 UNS S31803 Duplex stainless steel pipe
ASTM A790 UNS S31803 pipe Specification:
DUPLEX STEEL UNS S32205 S31803
SEAMLESS PIPES EQUIVALENT GRADE
| Standard | Equivalent Grade |
|---|---|
| ASTM | A790 UNS S31803 |
| EN | 1.4462 (X2CrNiMoN22-5-3) |
| JIS | SUS 329J3L |
| DIN | W.Nr 1.4462 |
| STANDARD | WERKSTOFF NR. | UNS |
| Duplex UNS S31803 | 1.4462 | S31803 |
| Duplex UNS S32205 | 1.4462 | S32205 |
DUPLEX STEEL A790 UNS S31803 PIPE CHEMICAL COMPOSITION
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | N | Fe |
| Duplex S31803 | 0.030 max. | 2.00 max. | 1.00 max. | 0.030 max. | 0.020 max. | 22.0 – 23.0 | 4.50 – 6.50 | 3.0 – 3.5 | 0.14 – 0.20 | 63.72 min. |
| Duplex S32205 | 0.030 max. | 2.00 max. | 1.00 max. | 0.030 max. | 0.020 max. | 21.0 – 23.0 | 4.50 – 6.50 | 2.50 – 3.50 | 0.08 – 0.20 | 63.54 min |
DUPLEX STEEL A790 UNS S31803 PIPE MECHANICAL PROPERTIES
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Duplex S31803 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 | 25 min. |
| Duplex S32205 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 | 25 min. |
Why A790 S31803 pipes?
Advantages of ASTM A790 S31803 Pipes: The allure of ASTM A790 S31803 pipes lies not only in their robust construction but also in their myriad advantages. Foremost among these is their unparalleled corrosion resistance, which surpasses that of conventional austenitic and ferritic stainless steels. This resistance extends to various forms of corrosion, including pitting, crevice corrosion, and stress corrosion cracking, ensuring longevity even in the harshest environments. Furthermore, the high strength of S31803 pipes enables them to withstand elevated temperatures and pressures, making them ideal candidates for high-stress applications. Beyond their intrinsic properties, ASTM A790 S31803 pipes offer cost-efficiency through reduced maintenance requirements and prolonged service life, delivering substantial savings over their operational lifespan.
Key Considerations for Selection and Installation: Selecting and installing ASTM A790 S31803 pipes necessitate meticulous attention to various factors to ensure optimal performance and longevity. Design considerations such as temperature, pressure, and fluid compatibility must be thoroughly evaluated to ascertain the suitability of S31803 pipes for the intended application. Additionally, adherence to best practices in welding and fabrication is imperative to maintain the integrity and corrosion resistance of these pipes. Rigorous testing and inspection protocols, including non-destructive testing (NDT), further guarantee the quality and reliability of ASTM A790 S31803 pipes throughout their lifecycle.
Conclusion: In conclusion, ASTM A790 S31803 pipes emerge as an exemplary solution for industries grappling with the challenges of corrosion, pressure, and temperature extremes. Their unrivaled combination of mechanical strength, corrosion resistance, and cost-efficiency positions them as indispensable assets in critical infrastructure and industrial processes worldwide. As industries continue to evolve and innovate, the enduring legacy of ASTM A790 S31803 pipes remains steadfast, embodying the pinnacle of engineering excellence and reliability.
Testing Requirements for ASTM A790 UNS S31803 Pipes
Tensile Test – Ensures minimum strength & elongation
Hardness Test – Confirms material is within specified limits
Impact Test (Charpy V-Notch) – Evaluates toughness at low temperatures
Intergranular Corrosion Test (IGC Test) – Ensures resistance to grain boundary corrosion
Hydrostatic Test – Verifies pipe pressure resistance
Non-Destructive Testing (NDT) – Includes ultrasonic or eddy current testing
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