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ASTM A790 is a standard specification established by the American Society for Testing and Materials. It pertains to seamless and welded stainless steel pipes made from ferritic and austenitic alloys. This standard outlines the composition and mechanical properties required for such pipes, as well as the necessary details on manufacturing processes, heat treatment, sampling and testing requirements, and product marking. Additionally, the use of hydrostatic or non-destructive electrical testing is mandated for ASTM A790 duplex pipe. This is done to ensure the overall integrity of these specialized pipes through means such as eddy current or ultrasonic testing (UT).
- The ASTM A790 is a well-recognized standard specification for both seamless and welded ferritic/austenitic stainless steel pipes. It outlines the necessary requirements and parameters that must be met during the manufacturing and testing of these pipes. This specification helps to ensure that the finished product has the necessary quality and performance characteristics needed for its intended application. Stainless steel pipes that comply with this standard are widely used in a variety of industries, including chemical processing, oil and gas, and power generation. Their durability, corrosion resistance, and high-temperature strength make them an excellent choice for demanding applications. Overall, the ASTM A790 is a crucial document for ensuring the accuracy and consistency of the stainless steel pipe manufacturing process.
- The following grades are available for different types of stainless steel: S31803, S32205, S32750, S32760, S31200, S31260, S31500, S32001, S32003, S32101, S32202, S32304, S32506, S32520, S32550, S32707. These grades vary in their chemical compositions and properties, making them suitable for specific applications.
For example, S31803 and S32205 are duplex stainless steel grades with high strength and resistance to corrosion. They are commonly used in industries such as oil and gas, chemical processing, and marine environments.
S32750 and S32760 are super duplex stainless steel grades known for their exceptional corrosion resistance and mechanical properties. They are widely used in offshore oil and gas platforms, seawater desalination plants, and other environments where corrosion is a major concern.
S31200, S31260, and S31500 are lean duplex stainless steel grades that offer a good combination of strength and corrosion resistance. They find applications in structural and architectural industries, as well as in tanks and containers for chemicals and food processing.
S32001, S32003, S32101, and S32202 are similar in composition to duplex stainless steel but have lower nickel content. These grades are cost-effective and exhibit good resistance to stress corrosion cracking.
S32304 is a duplex stainless steel grade with enhanced corrosion resistance compared to S31803 and S32205. It is commonly used in chemical processing, pulp and paper, and oil and gas industries.
S32506, S32520, and S32550 are hyper duplex stainless steel grades with excellent resistance to corrosion and high mechanical strength. These grades are used in harsh environments, including offshore platforms, chemical processing plants, and desalination systems.
S32707 is a high-alloy duplex stainless steel grade with improved strength and corrosion resistance. It is suitable for applications involving high temperatures and aggressive media.
These stainless steel grades offer a wide range of options for various industries and applications, ensuring durability and performance in challenging environments.
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ASME B36.10 specifies the requirements for both welded and seamless wrought steel pipes, catering to a wide range of applications that deal with high or low temperatures and pressures. This standard ensures that the pipes are fabricated to meet the necessary specifications and standards suitable for their intended use. By following the guidelines provided in ASME B36.10, manufacturers and users can ensure the performance and reliability of the pipes in various demanding conditions. Whether it's for industrial settings or commercial purposes, this specification serves as a fundamental reference for the design, production, and installation of steel pipes. The importance of complying with ASME B36.10 cannot be overstated as it guarantees the quality, safety, and efficiency of the steel pipes throughout their service life.
The specifications of ASTM A790 Duplex Stainless Steel Pipe are as follows. Please note that the content generated is rearranged based on the original information:
Key specifications for ASTM A790 Duplex Stainless Steel Pipe are as follows.
| Specification | ASTM A790 and ASME SA790 |
| Standard | ASTM, AISI, EN, GB, DIN, JIS, ASME |
| Seamless Pipe OD | Our range of products includes sizes ranging from 6.00MM Outer Diameter to 250MM Outer Diameter, with sizes up to 12Inch NB. We strive to offer a wide variety of options to meet the needs of our customers. Whether you require a small or large diameter, we have you covered with our range of sizes. Our products are designed with durability and high performance in mind, and we believe in providing quality, reliable solutions to our clients. So if you're looking for top-notch products, look no further than our extensive selection. |
| Welded Pipe size | 5.0 MM To 1219.2 MM |
| Thickness | 0.3 To 50 MM |
| Schedule | 5, 10, 40, 80, 80S, 160, XXS, XS |
| Pipe Finish | 8K, Mirror finish, Polished, 2B, Annealed and Pickled, BA, HL, No.1 The various surface finishes available for metal products include No.1, Polished, 2B, Annealed and Pickled, BA, HL, 8K, and Mirror finish. These finishes offer different levels of smoothness and shine to suit diverse applications. By rearranging these surface finishes, we can explore their characteristics and uses in different industries. The No.1 finish represents the coarsest type with a rough surface texture. It is commonly used for structural components where appearance is not crucial. On the other hand, the Polished finish involves a series of abrasion and buffing processes resulting in a smooth and glossy appearance. This finish is often applied in decorative elements or high-end products. For industrial applications, the 2B finish is widely employed due to its moderate smoothness and resistance to corrosion. It is achieved by annealing and pickling the metal, providing a clean and uniform surface suitable for further processing or fabrication. Similarly, the BA finish involves additional bright annealing to enhance the metal's shine and smoothness. It finds applications in the food processing, dairy, and pharmaceutical industries where hygiene is of utmost importance. The HL finish, also known as hairline finish, exhibits a semi-reflective surface with fine lines running in one direction. This finish is commonly used in architectural and decorative applications, including furniture, kitchen appliances, and handrails. Moving towards higher levels of shine, the 8K finish offers a near-mirror-like appearance. It undergoes multiple polishing and buffing stages to achieve a flawless surface reflectivity. This finish is commonly utilized in the electronics, automotive, and jewelry industries, where premium aesthetics are required. Finally, the Mirror finish represents the pinnacle of surface smoothness and reflectivity. It undergoes extensive polishing processes, resulting in a nearly perfect reflection of the surroundings. This finish is often favored in luxury products, interior design, and high-end architecture. In summary, the range of surface finishes mentioned, including No.1, Polished, 2B, Annealed and Pickled, BA, HL, 8K, and Mirror finish, cater to different applications and industries. From rugged and functional to elegant and luxurious, these finishes offer a myriad of options to suit various requirements and aesthetics. |
| Form | Pipes come in various shapes and types, including round, square, hollow, hydraulic, coiled, and straight. These options provide different functionalities and can be selected based on specific requirements. The round pipe is a classic choice, while the square pipe offers a more unique appearance. Hollow pipes are known for their lightweight characteristics, making them suitable for specific applications. Hydraulic pipes are designed to handle high-pressure fluids efficiently. Coiled pipes provide flexibility and ease of installation, especially in confined spaces. Lastly, straight pipes offer a simple and straightforward design. Considering these options, one can choose the most suitable pipe for their intended use. |
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ASTM A790 Standard Dimensional Tolerance
| Standard | Outer Diameter(mm) | Wall Thickness(mm) | Length(mm) | ||
| range | deviation | range | deviation | deviation | |
| ASTM A790 | 10.3-48.3 | 0.4/-0.8 | 10.3-73 | -1.6 | 6 |
| 48.3-114 | ±0.8 | D≥88.9 | 6 | ||
| 114-219 | 1.6/-0.8 | T/d≤5% | -1.8 | 6 | |
| 219-457 | 2.4/-0.8 | T/d＞5% | -1.2 | 6 | |
| 457-660 | 3.2/-0.8 | D≥20 | -1.2 | 6 | |
ASTM A790 Duplex Stainless Steel Pipe Chemical Composition
| Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Ni | Cr | Mo | N | Cu |
| S31803 | 0.03 | 2.00 | 0.03 | 0.02 | 1.00 | 4.5–6.5 | 21.0–23.0 | 2.5–3.5 | 0.08–0.20 | - |
| S32205 | 0.03 | 2.00 | 0.03 | 0.02 | 1.00 | 4.5–6.5 | 22.0–23.0 | 3.0–3.5 | 0.14–0.20 | - |
| S32750 | 0.03 | 1.20 | 0.035 | 0.02 | 0.80 | 6.0-8.0 | 24.0-26.0 | 3.0-5.0 | 0.24-0.32 | 0.5 |
| S32760 | 0.05 | 1.00 | 0.03 | 0.01 | 1.00 | 6.0-8.0 | 24.0-26.0 | 3.0-4.0 | 0.20-0.30 | 0.50–1.00 |
ASTM A790 Material Mechanical Properties
| Mechanical properties | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB（max） |
| S31803 | 90 [620] | 65 [450] | 25 | 290 |
| S32205 | 95 [655] | 65 [450] | 25 | 290 |
| S32750 | 116 [800] | 80 [550] | 15 | 300 |
| S32760 | 109 [750] | 80 [550] | 25 | 300 |
ASTM A790 Pipe Heat Treatment
| UNS Designation | Temperature °F [°C] | Quench |
| S31803 | 1870-2010℉(1020-1100℃) | Rapid cooling in air or water |
| S32205 | 1870-2010℉(1020-1100℃) | Rapid cooling in air or water |
| S32750 | 1880-2060℉(1025-1125℃) | Rapid cooling in air or water |
| S32760 | 1960-2085℉(1070-1140℃) | Rapid cooling in air or water |
The microstructure of ASTM A790 duplex stainless steel pipe is half ferrite and half austenite. This composition gives them better corrosion resistance and strength than ferritic or austenitic steels. A790 pipe will be made by a seamless or automated welding process in which no filler metal is added during the welding operation and thermal analysis will be performed to determine the percentages of the specified elements. To comply with the specified requirements, our ASTM A790 Stainless Steel Pipe suppliers, after manufacture, conduct tensile tests, hardening tests, flattening tests, hydrostatic tests, and non-destructive electrical tests.
ASTM A790 Duplex Stainless Steel Pipe Type
ASTM A790 UNS S31803 is the specification for duplex steel materials. The material is an alloy steel that contains chromium, molybdenum, and a small amount of nitrogen. The addition of these materials makes the pipes stronger and more resistant to corrosion. ASME SA 790 UNS S31803 is one of the duplex steel grades which is stronger and corrosion resistant.
ASTM A790 UNS S32205 (Duplex 2205) is a duplex steel that is a mixture of different elements. The composition of SA 790 UNS S32205 steel contains chromium, molybdenum, and nitrogen. The composition requires corrosion resistance and strength in the mid-range of other duplex steel types.
ASTM A790 UNS S32750 (Duplex 2507) is a super duplex stainless steel containing 25% chromium, 4% molybdenum, 7% nickel, and copper that can be seamless and welded ferritic/austenitic duplex pipe.
ASTM A790 UNS S32760 is a super duplex grade with a composition of 25% chromium, 4% molybdenum, and 7% nickel. The composition makes the pipes stronger and more resistant to corrosion. Therefore, ASME SA 790 UNS S32760 is suitable for highly corrosive sour environments.
Application of ASTM A790 Stainless Steel Pipe
Due to the excellent corrosion resistance and high strength of ASTM A790 duplex stainless steel pipe, ASTM A790 duplex pipe is suitable for harsh environments including chloride and sulfide environments. Below are some of the applications where duplex stainless steel tubing is commonly used in the following areas:
- The marine environment
- Pollution Control Equipment
- Natural Gas and Petroleum Refining
- Paper and Pulp
- Chemical Processing, Storage and Transportation
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