S31803 Duplex Steel Flanges 1/2in to 120in with 620 MPa Tensile Strength and PREN ≥35 Corrosion Resistance
Price:
Negotiable
MOQ:
Negotiable
Delivery Time:
Negotiable
Brand:
EVEREST
Product Description
S31803 Duplex Stainless Steel Flanges
Crafted from S31803 duplex stainless steel (UNS S31803), these high-performance flanges combine exceptional mechanical strength with outstanding resistance to chloride-induced corrosion. The dual-phase microstructure (50% austenite + 50% ferrite) delivers twice the yield strength of standard 316L steel and superior resistance to stress corrosion cracking, pitting, and crevice corrosion in harsh environments.
Key Advantages
Unmatched Corrosion Resistance
- PREN ≥35 ensures robust performance in chloride-rich media (seawater, brine, H₂S-containing fluids)
- Excellent performance in acidic/alkaline environments (pH 2-12)
- Ideal for subsea umbilicals, heat exchangers, and coastal chemical plants
High Strength & Durability
- Tensile strength ≥620 MPa with excellent impact toughness
- Suitable for high-pressure applications up to PN100/Class 2500
- Resists erosion and abrasion in slurry transport, mining, and pulp & paper industries
Cost-Efficient Longevity
- Outperforms 316L and 904L steels in aggressive conditions
- Reduces maintenance and replacement costs
- Operating temperature range: -50°C to 250°C (-58°F to 482°F)
Global Compliance & Traceability
- Manufactured to ASTM A182, ASME B16.5, EN 1092-1 standards
- NACE MR0175/ISO 15156 certified for sour service environments
- Full material traceability (MTC 3.1) with ISO 9001/14001 certifications
Customizable Solutions
- Types: Weld neck, slip-on, blind, threaded, and socket weld designs
- Sizes: DN15 to DN2000 (1/2in to 120in)
- Customizable bore dimensions, face finishes (RF/RTJ/FF), and pressure ratings
- Post-treatment options: Solution annealing, pickling, or shot blasting
Industry Applications
- Oil & Gas: Subsea pipelines, LNG terminals, refinery acid recovery systems
- Chemical Processing: Reactor vessels, sulfuric acid coolers, fertilizer production
- Water Treatment: Seawater reverse osmosis plants, brine pumps, offshore desalination units
- Pulp & Paper: Bleaching equipment, digesters, corrosive chemical storage
Why Choose S31803 Flanges?
- Leak-proof reliability with precision-machined sealing surfaces
- Stock availability for common sizes (DN15-DN600) with 15-day lead time
- Free technical support including corrosion compatibility analysis and welding guidelines
Quality Inspection
Our Quality Management Department implements comprehensive quality management across all sectors, including QC and QA processes. We conduct annual management reviews to ensure conformance, effectiveness, and suitability of our quality systems.
Project Achievements
| HENGLI Petrochemical 40 million/year oil refining integration project | ZHEJIANG Petrochemical 40 million/year oil refining integration project | LIANYUNGANG Petrochemical 3.2 million tons/year hydrocarbon comprehensive | YISHENG New Material 6.6 million tons/year PTA project | CNOOC Huizhou Refining & Chemical Co Huilian Phase II, 22 million/year oil refining reconstruction and expansion project |
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Certifications
Partners & Suppliers
Packing and Shipping
This product is carefully packaged to ensure safe delivery. It is wrapped in protective packaging material to prevent scratches or damage during transit. We use trusted delivery services to ensure prompt arrival in excellent condition, with order tracking available.
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Everest Technology (Wuxi) Co., Ltd
Location
No. 3, Gangchu Road, Hudai Town, Binhu District, Wuxi City, Jiangsu Province, China
Contact Person
DAVID