​​​​ASTM A790 UNS S31803 Duplex Tube | Seamless Stainless Steel Tube

Technical Specifications

ASTM A790 S31803 Tube Specifications

Chemical Composition

Chemical Composition of UNS S31803

Mechanical Properties

Mechanical Properties of ASTM A790 S31803 Tube

Material Characteristics

Duplex Stainless Steel Structure

S31803 duplex stainless steel contains both ferritic and austenitic phases. This duplex structure provides:

1. High Mechanical Strength

Compared with conventional austenitic stainless steels, duplex stainless steel generally provides higher yield strength, allowing engineers to consider optimized wall thickness designs in suitable applications.

2. Corrosion Resistance

The combination of chromium, nickel, molybdenum and nitrogen provides resistance against various corrosive environments.

Suitable for applications involving:

​​· Chloride-containing environments

​​​​· Chemical processing media

​​· Marine atmosphere

​​· Industrial fluids

3. Engineering Flexibility

ASTM A790 S31803 tube is available in:

​​· Seamless tube

​​· Welded tube

​​· Different diameters

​​· Different wall thicknesses

​​· Customized lengths

Applications of ASTM A790 S31803 Tube

Oil and Gas Industry

Used for:

​​· Offshore piping systems

​​· Process piping

​​· Oil and gas transportation equipment

Chemical Processing

Applications include:

​​· Chemical reactors

​​· Heat exchangers

​​· Process pipelines

Marine Engineering

Used in:

​​· Seawater systems

​​· Marine equipment

​​· Offshore structures

Power Generation

Suitable for:

​​· Cooling systems

​​· Industrial heat exchanger systems

Industrial Equipment

Commonly used in:

​​· Pressure equipment

​​· Fluid transportation systems

Advantages of ASTM A790 S31803 Duplex Tube

ASTM Standard Compliance

Manufactured according to ASTM A790 requirements for duplex stainless steel seamless and welded tubes.

Duplex Stainless Steel Performance

The ferritic-austenitic structure provides a combination of mechanical strength and corrosion resistance for industrial applications.

Flexible Manufacturing Options

Available with:

​​· Seamless production

​​· Welded production

​​· Customized OD and wall thickness

​​· Various surface treatments

Traceable Material Documentation

Supply can include:

​​· Material Test Certificate (MTC)

​​· Chemical composition report

​​· Mechanical test records

​·Inspection documents according to project requirements