Haihao Group Dispatches Duplex Stainless Steel Elbows to UAE

Haihao Group has completed manufacturing, full material testing, and export handling for a high-specification shipment of duplex stainless steel pipe fittings supplied to a major oil and gas entity in the United Arab Emirates. Engineered to withstand high-pressure sour gas service and aggressive marine environments, this order consists of 2″ Schedule 80 seamless 90° long radius (LR) elbows forged from ASTM A815 Grade UNS S31803 duplex alloy.

Shipment Technical Breakdown

Partnering with an established ASTM A815 UNS S31803 elbow manufacturer ensures exact bevel geometry, strict ferrite phase balance, and verified NACE MR0175 compliance for critical Middle East hydrocarbon transport lines. Below are the verified parameters for the UAE supply:

Item Description: Seamless 90° Long Radius Pipe Elbow (R = 1.5D).

Nominal Size & Wall Thickness: 2 Inch (NPS 2 / DN50), Schedule 80 (SCH-80).

Connection Type: Butt Weld (BW) with smooth bevel end prep per ASME B16.9.

Material Specification: ASTM A815 Grade UNS S31803 (Duplex Stainless Steel 2205).

Dimensional Standard: ASME B16.9 (Factory-Made Wrought Buttwelding Fittings).

Compliance Standards: NACE MR0175 / ISO 15156, DPE Specifications DUSUP-P-05 & DPP-40.

Certification: EN 10204 Type 3.1 Mill Test Certificate.

ASTM A815 UNS S31803 duplex stainless steel 2 inch Sch 80 90 degree seamless elbows manufactured by Haihao Group

Metallurgical Integrity: Ferrite Phase Control & Sour Service Defense

Duplex stainless steel Grade UNS S31803 relies on a balanced dual-phase microstructure to combine the high tensile strength of ferrite with the toughness and pitting resistance of austenite. In hydrogen sulfide (H₂S) sour service environments common across UAE oil fields, maintaining strict phase ratios is essential to prevent sulfide stress cracking (SSC).

As a specialized ASTM A815 UNS S31803 elbow manufacturer, Haihao Group implements precise heat treatment protocols to guarantee optimal material properties:

Ferrite Content Optimization: Ferrite phase balance was strictly controlled between 40% and 65%, eliminating brittle intermetallic phases (such as sigma phase) and ensuring maximum resistance to stress corrosion cracking (SCC).

Low-Temperature Impact Energy: Charpy V-Notch impact testing performed at -46°C yielded minimum absorbed energy values exceeding 65J (average) and 45 J (single), guaranteeing high toughness under extreme pressure surges.

Sour Service Compliance: Fully compliant with NACE MR0175 / ISO 15156 and Dubai Petroleum Establishment (DPE) DPP-40 requirements for sour gas production.

Carbon Steel Contamination Protection: Dedicated stainless-steel handling tools, specialized pickling, and isolated storage ensured 100% freedom from iron/carbon steel surface contamination.

Precision Beveling, Quality Assurance & Certification

To maintain our standing as a top-tier ASTM A815 UNS S31803 elbow manufacturer, every fitting underwent rigorous non-destructive examination and mechanical verification prior to seaworthy packaging:

Dimensional & Wall Thickness Control: Bevel angles, wall thickness consistency across the bend radius, and center-to-end dimensions were 100% checked against ASME B16.9 tolerances.

Non-Destructive Testing (NDT): Liquid penetrant testing (PT) was applied to all outer and inner surfaces to verify zero forging cracks or surface defects.

Positive Material Identification (PMI): Handheld XRF analysis verified key alloying elements (chromium, nickel, molybdenum, nitrogen) on every individual elbow.

Traceable Documentation: Every batch was packed with EN 10204 3.1 certification detailing heat chemistry, impact energy logs at -46°C, ferrite phase percentages, and hardness records.

Choosing an experienced ASTM A815 UNS S31803 elbow manufacturer ensures complete project compliance and smooth welding operations during field installation.

Partner with Haihao Group for UAE & Middle East Energy Projects

In need of NACE-compliant duplex stainless steel fittings, ASTM A815 UNS S31803 seamless elbows, or custom ASME B16.9 butt weld components for your oil and gas infrastructure in the UAE? Rely on a proven ASTM A815 UNS S31803 elbow manufacturer. Contact the Haihao Group commercial engineering team today for quick technical consultations and competitive quotations.