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.
790 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
These attributes mean that Duplex UNS S31803, 1.4462 can be used successfully as an alternative to standard stainless steel specifications in applications where higher strength and resistance to stress corrosion cracking is required
ASTM A790 S31803 pipes find applications in various industries where a combination of high strength and excellent corrosion resistance is required. Some common applications include:
- Oil and Gas Industry: Duplex stainless steel pipes are used extensively in upstream and downstream oil and gas operations. They are employed in offshore platforms, subsea pipelines, refineries, and petrochemical plants due to their resistance to corrosion from harsh environments, including seawater and acidic or chloride-containing fluids.
- Chemical Processing: The chemical processing industry often deals with corrosive substances, high temperatures, and challenging operating conditions. ASTM A790 S31803 pipes are used in chemical plants for transporting corrosive chemicals, acids, and solvents safely and reliably.
- Desalination Plants: Desalination involves treating seawater or brackish water to produce freshwater. Duplex stainless steel pipes are utilized in desalination plants for seawater intake, brine disposal, and freshwater distribution systems due to their resistance to corrosion and chloride-induced stress corrosion cracking.
- Pulp and Paper Industry: Duplex stainless steel pipes are suitable for use in the pulp and paper industry, particularly in processes involving bleaching, chemical recovery, and handling corrosive liquids such as bleach liquor and black liquor.
- Power Generation: In power plants, ASTM A790 S31803 pipes are employed in systems for handling cooling water, steam, and other fluids. Their corrosion resistance and high strength make them suitable for applications in both conventional and nuclear power plants.
- Mining and Mineral Processing: Duplex stainless steel pipes are used in mining and mineral processing operations for transporting corrosive slurries, acids, and abrasive materials. They offer durability and resistance to wear, erosion, and corrosion, thereby extending the service life of piping systems.
- Construction and Infrastructure: Duplex stainless steel pipes are increasingly being used in architectural and structural applications where corrosion resistance and aesthetic appeal are desired. They are employed in bridges, tunnels, wastewater treatment plants, and other infrastructure projects.
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
1.Outer Diameter: 1/4″ – 16″ seamless
Welded tubes up to 48″
2.Wall thickness:1 mm-50mm
3.Length: 6 metre or as per customer request
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 | 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.
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