A790 DUPLEX UNS S31803 Stahlrohr


A790 DUPLEX UNS S31803 Steel Pipe

At ABTER STEEL PIPE, we offer A790 Duplex UNS S31803 steel pipes that are known for their excellent corrosion resistance, hohe Festigkeit, und Haltbarkeit. These pipes are widely used in various industries such as oil and gas, chemische Verarbeitung, und Marineanwendungen. Our A790 Duplex UNS S31803 steel pipes adhere to the ASTM A790 specification, ensuring their quality and performance.

Duplex UNS S31803 Pipe Specification

The specification for Duplex UNS S31803 pipe includes the following key details:

  • Norm: ASTM A790/A790M
  • Grad: Duplex UNS S31803
  • Size Range: NPS 1/8to NPS 48″ (DN6 to DN1200)
  • Wandstärke: Schedule 5S to Schedule XXS
  • Länge: Einzeln zufällig, Doppelt zufällig, or Customized
  • End Connections: Glattes Ende, Abgeschrägtes Ende, Mit Gewinde, or Coupled
  • Oberflächenfinish: Pickled, Passivated, or Polished

These specifications ensure that our Duplex UNS S31803 pipes meet the necessary requirements for seamless pipe manufacturing and are suitable for a wide range of applications.

Chemical Material Composition of Duplex UNS S31803 Pipe

The chemical composition of Duplex UNS S31803 pipe is as follows:

  • Chrom (Cr): 21.0 – 23.0%
  • Nickel (In): 4.5 – 6.5%
  • Molybdän (Mo): 2.5 – 3.5%
  • Stickstoff (N): 0.08 – 0.20%
  • Mangan (Mn): 2.0% (maximal)
  • Silizium (Und): 1.0% (maximal)
  • Phosphor (P): 0.03% (maximal)
  • Schwefel (S): 0.02% (maximal)
  • Kohlenstoff (C): 0.030% (maximal)

The specific chemical composition of Duplex UNS S31803 pipe ensures its superior corrosion resistance and mechanical properties, making it suitable for demanding environments.

Mechanical Properties of Duplex UNS S31803 Seamless Pipes

The mechanical properties of Duplex UNS S31803 seamless pipes are as follows:

  • Zugfestigkeit: 620 MPa (Minimum)
  • Streckgrenze: 450 MPa (Minimum)
  • Verlängerung: 25% (Minimum)
  • Härte: 290 (maximal) HB or 30 HRC (maximal)

These mechanical properties highlight the strength, Duktilität, and toughness of Duplex UNS S31803 pipes, making them ideal for applications where high mechanical performance is required.

Equivalent Material of ASTM A790 Duplex UNS S31803 Seamless Pipe

The equivalent materials for ASTM A790 Duplex UNS S31803 seamless pipe include:

  • EIN/DEIN: 1.4462
  • UNS: S32205
  • ER: SUS 329J3L

These equivalent materials ensure that our Duplex UNS S31803 pipes can be easily sourced and used in various international markets.


To place an order for ASTM A790 Duplex UNS S31803 seamless pipes, please provide the following information:

  • Quantity: Specify the required quantity of pipes.
  • Größe: Indicate the desired size of the pipes in terms of nominal pipe size (NPS) or diameter and wall thickness.
  • Länge: Specify the required length of the pipes.
  • End Connections: Specify the desired end connections, such as plain end, beveled end, mit Gewinde, or coupled.
  • Oberflächenfinish: Specify the desired surface finish, such as pickled, passivated, or polished.
  • Additional Requirements: If you have any specific additional requirements, please mention them.

Our team at ABTER STEEL will ensure that your order is processed promptly and that you receive high-quality ASTM A790 Duplex UNS S31803 seamless pipes that meet your specifications and expectations.

Häufig gestellte Fragen (FAQ)

1. What is the difference between UNS S31803, S32750, and S32760?

The main difference lies in their chemical compositions. UNS S31803 is the most widely used grade, while UNS S32750 (2507) and UNS S32760 (Zeron 100) have higher chromium, Molybdän, und Stickstoffgehalt, resulting in improved corrosion resistance and strength.

2. Are duplex stainless steel pipes more expensive than other stainless steel pipes?

Ja, duplex stainless steel pipes are generally more expensive due to their higher alloy content and superior properties. Jedoch, their long-term durability and resistance to corrosion can result in cost savings over time.

3. Can duplex stainless steel pipes be welded?

Ja, duplex stainless steel pipes can be welded using appropriate welding techniques. Jedoch, it is important to ensure proper heat treatment and control to maintain the desired properties of the material.

4. How are duplex stainless steel pipes tested for quality assurance?

Duplex stainless steel pipes undergo various tests, including tension, hardening, flattening, hydrostatic, and nondestructive electric tests, to ensure compliance with the specified requirements of the ASTM A790 standard.

5. What are the advantages of using duplex stainless steel pipes?

The advantages of using duplex stainless steel pipes include excellent corrosion resistance, hohe Festigkeit, gute Schweißbarkeit, und Beständigkeit gegen Spannungsrisskorrosion. They are also suitable for use in challenging environments and offer cost savings in the long run.

2 Kommentare

    • Ronsun2023

      2024年3月24日 bei pm12:56

      ASTM A928 UNS S31803 Mechanical Properties
      Properties Metric Imperial
      Bruchdehnung (In 50 mm) 25.0 % 25.0 %
      Härte, Brinell 293 293
      Härte, Rockwell c 31.0 31.0
      Tensile strength at break 621 MPa 90000 psi


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