ASTM A815 UNS S31803 Duplex Stainless Steel 90LR Elbow
Product Overview
Duplex Stainless Steel Long Radius Elbow for High Corrosion Resistance Piping
ASTM A815 UNS S31803 Duplex Stainless Steel 90LR Elbow is a forged or formed pipe fitting designed for changing flow direction in high-performance piping systems. Manufactured according to ASTM A815 / ASME SA815 specifications, this duplex stainless steel elbow combines high mechanical strength with excellent resistance to chloride-induced corrosion, making it suitable for demanding industrial environments.
The S31803 duplex structure contains both ferritic and austenitic phases, providing improved strength compared with conventional austenitic stainless steels while maintaining good corrosion resistance. The long radius (1.5D) design reduces flow turbulence and pressure loss, making it widely used in offshore, chemical processing, oil and gas, desalination and marine piping applications.
Technical Specifications
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Item
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Specification
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Product Name
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ASTM A815 UNS S31803 Duplex Stainless Steel 90LR Elbow
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Standard
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ASTM A815 / ASME SA815
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Material Grade
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UNS S31803 / Duplex 2205
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Product Type
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90 Degree Long Radius Elbow
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Radius Type
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Long Radius (1.5D)
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Manufacturing Process
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Hot Formed / Cold Formed
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Size Range
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NPS 1/2" – 48"
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Wall Thickness
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SCH 5S – XXS
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Connection Type
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Butt Weld
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Heat Treatment
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Solution Annealed
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Surface Finish
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Pickled / Polished / Machined
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Testing
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PMI, Dimensional Inspection, Hydrostatic Test (If Required)
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Certification
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EN 10204 3.1 MTC Available
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Chemical Composition
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Element
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Content (%)
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Chromium (Cr)
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21.0–23.0
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Nickel (Ni)
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4.5–6.5
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Molybdenum (Mo)
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2.5–3.5
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Nitrogen (N)
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0.08–0.20
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Carbon (C)
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≤0.030
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Manganese (Mn)
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≤2.00
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Silicon (Si)
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≤1.00
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Phosphorus (P)
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≤0.030
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Sulfur (S)
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≤0.020
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Iron (Fe)
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Balance
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Mechanical Properties
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Property
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Requirement
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Tensile Strength
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≥620 MPa
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Yield Strength
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≥450 MPa
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Elongation
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≥25%
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Hardness
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≤290 HB
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Product Features
- High Strength Duplex Structure
UNS S31803 duplex stainless steel combines ferritic and austenitic microstructures, providing higher yield strength than standard 316L stainless steel for pressure piping applications.
- Superior Resistance to Chloride Corrosion
The combination of chromium, molybdenum and nitrogen improves resistance to pitting and crevice corrosion, especially in chloride-containing environments such as seawater and chemical process media.
- Long Radius Design for Efficient Flow
The 90LR (1.5D) elbow design provides a smoother flow transition compared with short radius elbows, reducing turbulence and pressure drop in piping systems.
- Reliable Welded Piping Connection
The butt weld end design allows full penetration welding with adjacent pipes, creating a continuous piping system suitable for pressure service.
- Suitable for Aggressive Industrial Conditions
Designed for applications where both mechanical strength and corrosion resistance are required, including offshore platforms, chemical plants and marine systems.
Why Choose S31803 Duplex Elbow Instead of 316L?
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Feature
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UNS S31803 Duplex
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316L Stainless Steel
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Material Structure
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Ferritic + Austenitic Duplex
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Austenitic
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Yield Strength
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Higher
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Lower
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Chloride Resistance
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Excellent
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Good
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Stress Corrosion Cracking Resistance
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Better
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Moderate
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Offshore Service
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Preferred
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Limited Depending on Condition
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Heavy Pressure Application
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Suitable
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General Service
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Available Dimensions
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Parameter
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Range
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Size
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NPS 1/2"–48"
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Elbow Type
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90 Degree Long Radius
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Radius
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1.5D
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Thickness
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SCH 5S–XXS
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End Type
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Butt Weld
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Standard
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ASME B16.9 / MSS SP-43 (According to Requirement)
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Custom Dimensions
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Available
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Applications
ASTM A815 UNS S31803 90LR Elbows are widely used in:
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Offshore Oil & Gas Platforms
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Petrochemical Plants
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Chemical Processing Systems
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Desalination Facilities
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Marine Piping Systems
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Seawater Cooling Systems
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LNG Facilities
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Power Generation Plants
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Pressure Piping Systems
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Pulp & Paper Industry
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Fertilizer Plants
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Industrial Water Treatment
Inspection and Testing
Inspection options include:
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Positive Material Identification (PMI)
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Chemical Composition Analysis
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Tensile Testing
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Hardness Testing
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Dimensional Inspection
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Visual Inspection
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Surface Examination
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Non-Destructive Testing (NDT)
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Third Party Inspection
Why Choose YUHONG S31803 Duplex Elbows
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Manufactured according to ASTM A815 / ASME SA815 requirements
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Duplex stainless steel solution annealed structure
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Suitable for corrosive and high-pressure piping systems
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Long radius design for improved flow performance
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Complete inspection documentation available
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Customized dimensions supported for industrial projects
Frequently Asked Questions
- What is ASTM A815 S31803 elbow?
ASTM A815 S31803 elbow is a duplex stainless steel butt weld fitting designed for industrial piping systems requiring high strength and corrosion resistance.
- What is the difference between 90LR and 90SR elbow?
A 90LR elbow has a long radius of approximately 1.5 times the pipe diameter, providing smoother flow compared with a short radius elbow.
- Why use duplex stainless steel fittings?
Duplex stainless steel offers higher mechanical strength and improved resistance to chloride corrosion and stress corrosion cracking compared with conventional stainless steels.
- Is S31803 the same as Duplex 2205?
Yes. UNS S31803 is one of the commonly recognized grades within the Duplex 2205 family.
- Can customized duplex elbows be supplied?
Yes. Size, wall thickness, radius, end preparation and inspection requirements can be customized according to project specifications.
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