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ASTM A790 Duplex Stainless Steel Pipe
ASTM A790 duplex stainless steel pipe is a high-performance piping solution engineered for corrosive, high-pressure, and offshore environments. Combining the advantages of ferritic and austenitic structures, it delivers twice the strength of conventional stainless steels and superior resistance to chloride-induced stress corrosion cracking (SCC).
Compared with standard materials such as ASTM A312 Stainless Steel Pipe, ASTM A790 duplex pipe provides enhanced durability, longer service life, and reduced lifecycle cost, making it the preferred choice for demanding industries.
Available in both seamless and welded types, with grades including S31803 (Duplex 2205), S32205, and S32750 (Super Duplex 2507), ASTM A790 pipes are widely used in oil & gas, offshore platforms, desalination plants, chemical processing, and marine engineering systems. As a reliable duplex stainless steel pipe supplier, we provide full-size range, strict quality inspection, and fast global delivery to meet international project requirements.
Looking for a trusted ASTM A790 duplex pipe supplier? Contact us now for a fast quotation and technical support.
High Strength. Corrosion Resistant. Engineered for Extreme Environments.
✔ 2× Strength vs Austenitic Stainless Steel
✔ Excellent Resistance to Chloride & Seawater
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Product Overview
ASTM A790 duplex stainless steel pipe is designed for high-pressure and highly corrosive environments, combining the benefits of ferritic and austenitic structures. Compared with conventional stainless steels such as ASTM A312 Stainless Steel Pipe, duplex pipes offer significantly higher strength and superior resistance to stress corrosion cracking (SCC).
Available in both seamless and welded types, ASTM A790 pipes are widely used in offshore oil platforms, desalination plants, and chemical processing systems where durability and long service life are critical.
Why Choose Us
✔ 10+ Years Duplex Steel Export Experience
✔ Strict Quality Inspection System (SGS / BV Supported)
✔ Fast Delivery (7–15 Days)
✔ Full Size Range & Custom Solutions
✔ Serving Global EPC & Industrial Projects
Specifications
ASTM A790 covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
Size: OD: NPS 1/8" - 30" (10.3-762mm) WT: SCH5S/10S/40S/80S (1.65 - 12.7mm)
Length: 5.8m - 12m
Delivery condition: Solution Annealed
Packaging: bundle, plywood case.
Grade:
UNS S31200, UNS S31260, UNS S31500, UNS S31803
UNS S32003, UNS S32101, UNS S32202, UNS S32205 (2205), UNS S32304 (2304), UNS S32506, UNS S32520, UNS S32520, UNS S32550 (255), UNS S32707, UNS S32750 (2507), UNS S32760, UNS S32808, UNS S32900 (329), UNS S32906, UNS S32950
UNS S33207, UNS S39274, UNS S39277
| A Maximum, unless a range or minimum is indicated. Where ellipses (...) appear in this table, there is no minimum and analysis for the element need not be determined or reported. B New designation established in accordance with Practice E 527 and SAE J1086. C Common name, not a trademark, widely used, not associated with any one producer. 329 is an AISI number. D % Cr + 3.3 3 % Mo + 16 3 % N. |
Please indicate the information needed below when you have inquiries or orders:
Orders for material under this specification should include the following, as required, to describe the desired
material adequately:
1.1 Quantity (feet, [meters], or number of lengths),
1.2 Name of material (ferritic/austenitic steel pipe),
1.3 Process (seamless or welded),
1.4 Grade (see Table 1),
1.5 Size (NPS designator or outside diameter and schedule number of average wall thickness),
1.6 Length (specific or random) (see Section 11),
1.7 End finish (section on ends of Specification A999/A999M),
1.8 Optional requirements (product analysis, Section 9; hydrostatic test or nondestructive electric test, Section 14),
1.9 Test report required (section on certification of Specification A999/A999M),
1.10 Specification designation
1.11 Special requirements and any supplementary requirements selected.
ASTM A790 Duplex Stainless Steel Pipe Specifications
| Specification | Description |
|---|---|
| Standard | ASTM A790 / A790M |
| Type | Duplex Stainless Steel Pipe |
| Grades | UNS S31803, S32205, S32750 (Super Duplex) |
| Form | Seamless, Welded |
| Pipe Size | 1/2" – 24" (DN15 – DN600) |
| Wall Thickness | SCH 5 – SCH 160, Standard & Custom |
| Length | 6 m, 12 m, or cut-to-size |
| Surface Finish | Pickled & Passivated, 2B, BA, or Customized |
| End Connection | Plain End, Beveled, Threaded, Flanged |
| Testing | Hydrostatic Test, PMI, UT, RT, Hardness |
Why choose ASTM A790?
Corrosion resistance: Provides excellent corrosion resistance, particularly against stress corrosion cracking.
Versatility: Suitable for a variety of industrial and high-temperature applications.
Strength and toughness: Duplex structures typically offer a good combination of strength and toughness.
Applications
Typical applications of ASTM A790 duplex pipes in harsh and corrosive environments.
Offshore oil & gas pipelines
Seawater desalination systems
Chemical processing equipment
Heat exchangers & pressure systems
Marine engineering
Inspection & Quality Assurance
100% Hydrostatic Testing & Non-Destructive Testing (NDT)
PMI / Chemical Verification to Ensure Grade Compliance
Third-Party Inspection Available (SGS, BV, TUV, Intertek)
ISO 9001 & ISO 14001 Certified Manufacturing
FAQ
What is ASTM A790 duplex stainless steel pipe?
ASTM A790 duplex stainless steel pipe is a high-strength, corrosion-resistant pipe combining austenitic and ferritic stainless steel properties. It is widely used in chemical, oil & gas, marine, and industrial applications.
What grades are available in ASTM A790 pipes?
Common grades include UNS S31803, S32205 (standard duplex), and S32750 (super duplex) for extreme corrosion resistance.
Are ASTM A790 pipes seamless or welded?
Both seamless and welded (ERW/LR) pipes are available. Seamless pipes are preferred for high-pressure and critical applications, while welded pipes are cost-effective for larger diameters.
What pipe sizes and schedules are offered?
Sizes range from 1/2" to 24" (DN15–DN600) with wall thickness schedules from SCH 5 to SCH 160. Custom thicknesses can also be produced.
Can ASTM A790 pipes withstand seawater and harsh chemical environments?
Yes, especially S32750 super duplex pipes, which are highly resistant to pitting, crevice corrosion, and stress corrosion cracking.
What surface finishes are available?
Pickled & passivated (standard), 2B, BA, or custom finishes can be supplied depending on application requirements.
Are ASTM A790 pipes weldable and easy to fabricate?
Yes, these pipes can be welded, bent, and fabricated using standard stainless steel methods. Proper filler metals and welding procedures are recommended for super duplex grades.
Do ASTM A790 pipes meet international standards?
Yes, they comply with ASTM A790/A790M, ASME B36.19M (dimensions), and ISO 9001 certified quality standards.
Can third-party inspections be arranged?
Yes, inspections by SGS, BV, TUV, or Intertek can be performed upon request to ensure chemical composition, dimensions, and mechanical properties.
Do you provide custom lengths and packaging for export?
Standard lengths are 6 m or 12 m, with custom cut-to-size options. Pipes are packaged in anti-rust-coated wooden crates or steel pallets for safe export shipment.
What industries commonly use ASTM A790 pipes?
Chemical processing, petrochemical, oil & gas, desalination plants, marine/offshore platforms, power plants, and pulp & paper industries.
What is the difference between duplex and super duplex ASTM A790 pipes?
Super duplex (S32750) offers higher strength and superior resistance to chloride stress corrosion cracking compared to standard duplex (S31803/S32205).
Can ASTM A790 pipes be used for high-pressure applications?
Yes, especially seamless duplex and super duplex pipes, which can handle high-pressure pipelines and critical equipment.
What testing is performed on ASTM A790 pipes?
Hydrostatic testing, ultrasonic testing (UT), radiographic testing (RT), hardness testing, and PMI for chemical verification.
How long is the typical lead time for ASTM A790 pipes?
Lead time depends on size, grade, and quantity but typically ranges from 3 to 6 weeks for standard orders.
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