The ASME SA815 WPS UNS S31803 seamless elbows are manufactured from ASME SA790 / ASTM A790 UNS S31803 seamless pipes, ensuring full compliance with the applicable ASME/ASTM material and manufacturing standards for duplex stainless steel seamless fittings.

Duplex stainless steels are a family of stainless steels. These are called duplex (or austenitic-ferritic) grades because their metallurgical structure consists of two phases, austenite (face-centered cubic lattice) and ferrite (body centered cubic lattice) in roughly equal proportions. They are designed to provide better corrosion resistance, particularly chloride stress corrosion and chloride pitting corrosion.Duplex stainless steel UNS S31803 (and the other specifications listed below) is described as a duplex stainless steel with a microstructure of 50:50 austenite and ferrite. The steel combines good mechanical strength (typically up to over 480 MPa yield strength) and ductility with moderate to
good corrosion resistance in a variety of environments.

Duplex stainless steels are usually divided into three groups based on their pitting corrosion resistance, characterised by the pitting resistance equivalence number, PREN = %Cr + 3.3 %Mo + 16 %N.

Standard duplex (PREN range: 28–38)
Typically Grade EN 1.4462 (also called 2205). It is typical of the mid-range of properties and is perhaps the most used today
By agreement, the alloy can be supplied with a PREN (Pitting Resistance Equivalent) at >34 which ensures that the resistance to pitting corrosion is as high as possible for this alloy grade.

A815 WPS  UNS S31803 Pipe Fittings Chemical Composition

The PREN is obtained by applying a mathematical formula to the chemical composition of a steel so that PREN = %Cr + (3.3 x %Mo) + (16 x %N). Using this formula 31803 Duplex stainless has a PREN of 35 which when compared with the PREN of Type 304 and Type 316 (18 and 24 respectively) demonstrates its superior corrosion resistance.
In short, due to its higher strength, longer component life cycle, and lower alloy composition, Duplex stainless can be a very cost effective solution to an engineering problem.

Hardness

• Maximum Hardness: ≤ 290 HB

• Typical Hardness Range: 240 – 280 HB

The higher hardness contributes to improved pressure resistance and reduced wall thickness requirements.

Size Range & Dimensions (ASME B16.9)

• Product Types:

  • 45° / 90° Elbow (Long Radius & Short Radius)

  • Equal Tee / Reducing Tee

  • Concentric / Eccentric Reducer

• Nominal Pipe Size (NPS): 1/2″ – 48″

• Wall Thickness: SCH 10, 20, 40, STD, XS, XXS

• Manufacturing: Seamless / Welded

All fittings are produced in accordance with ASME B16.9 dimensional tolerances.

Marking:Standard/ As per request

Packing: Wooden case(Fumigation free) Or as per request

Inspection & Testing

ASTM A815 WPS S31803 pipe fittings undergo strict inspection procedures, including:

• Positive Material Identification (PMI)

• Chemical Composition Analysis

• Mechanical Property Testing

• Dimensional Inspection

• Visual Examination

• Ferrite Content Test (Duplex Control)

• Certification: EN 10204 3.1 / 3.2