S31803 Duplex Stainless Steel Plate, also known as Duplex S31803 Plate, is a corrosion-resistant and high-strength stainless steel sheet widely used in demanding industries. It is produced with a dual-phase microstructure consisting of austenite and ferrite, which provides excellent mechanical strength and superior resistance to stress corrosion cracking compared to conventional stainless steels.
Our Duplex S31803 Plates are manufactured strictly in compliance with international standards such as ASTM A240, ASME SA240, EN 1.4462, and UNS S31803. All materials are supplied with mill test certificates (MTC), third-party inspection reports, and can be accompanied by SGS, BV, or TUV certifications upon request. With stable performance in mechanical strength, wear resistance, and pitting corrosion resistance, S31803 Duplex Plates are an ideal choice for critical applications.
Key Features & Advantages
Superior Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking.
High Mechanical Strength: Higher yield strength than 316L and 317L stainless steels, allowing thinner plate usage for cost efficiency.
Reliability & Certifications: Supplied with complete quality reports, material certificates, and third-party inspection upon request.
Long Service Life: Outstanding wear resistance ensures durability in aggressive working environments.
Global Standards Compliance: Conforms to ASTM, ASME, EN, and ISO standards, ensuring compatibility with international projects.
Applications
Duplex S31803 Plate is widely applied in industries requiring both corrosion resistance and mechanical strength:
Oil & Gas Industry: Offshore platforms, subsea pipelines, risers, and pressure vessels.
Chemical & Petrochemical: Heat exchangers, evaporators, and processing equipment.
Marine & Shipbuilding: Ballast tanks, ship hulls, and seawater desalination units.
Construction & Structural: Bridges, architectural facades, load-bearing structures.
Pulp & Paper Industry: Digesters, bleaching equipment, and storage tanks.
Product Specifications & Technical Data
|
Parameter |
Specification Range / Standard |
|
Grade / Standard |
ASTM A240 / ASME SA240 / UNS S31803 / EN 1.4462 |
|
Thickness |
3mm – 100mm (customizable) |
|
Width |
1000mm – 3000mm (cut-to-size available) |
|
Length |
2000mm – 12000mm or customized |
|
Surface Finish |
2B, BA, No.1, No.4, HL, or polished |
|
Yield Strength (Rp0.2) |
≥ 450 MPa |
|
Tensile Strength (Rm) |
620 – 880 MPa |
|
Elongation (%) |
≥ 25% |
|
Hardness |
≤ 290 HB |
|
Corrosion Resistance |
Excellent resistance to chloride and seawater environments |
|
Certificates |
MTC, SGS, BV, TUV, ISO 9001, CE |
Customization Services
At Jiangsu Cunrui Metal Products Co., Ltd., we offer flexible customization for Duplex S31803 Plate:
Cut-to-size service (laser cutting, water jet cutting, plasma cutting).
Processing support: drilling, bending, polishing, welding, and edge preparation.
Special dimensions available based on drawings.
Surface treatments: pickling, sandblasting, mirror finish.
Low minimum order quantity (MOQ) and quick response to urgent projects.
Price & Delivery
Competitive Pricing: Cost-effective without compromising quality.
Bulk Discounts: Attractive offers for large-volume orders.
Delivery Time: Standard lead time is 7–15 days; ready stock available for common sizes.
Flexible Logistics: Export-standard seaworthy packaging, supporting global shipping solutions.
Our Strength
Manufacturing Capability: Advanced rolling mills, CNC cutting equipment, and heat treatment facilities.
Production Capacity: Over 50,000 tons annual output of stainless steel plates.
Export Experience: Global supply to Europe, America, Middle East, and Southeast Asia.
Certifications: ISO 9001, PED, CE, and third-party approvals.
Technical Team: Professional R&D and engineering support to provide optimized material solutions.
Service & Support
Fast Response: Inquiries answered within 12 hours.
Technical Support: Engineering guidance for material selection and application.
Packaging: Wooden pallets, waterproof wrapping, and fumigation-free export packaging.
After-Sales Guarantee: Replacement or refund for quality-related issues.
Global Compliance: Export-ready documentation including CO, Form E, Form A, and inspection reports.
FAQ
Q1: What is the difference between S31803 and 2205 Duplex Stainless Steel?
A1: S31803 is the original grade designation, while 2205 (UNS S32205) is its improved version with tighter composition control. Both are widely interchangeable.
Q2: Can I order small quantities of Duplex S31803 Plate?
A2: Yes, we accept flexible MOQ and also provide cut-to-size services for urgent or small projects.
Q3: Do you provide test certificates with the plates?
A3: Absolutely. All Duplex S31803 Plates come with EN10204 3.1 or 3.2 MTC, and third-party inspection is available.
Q4: What surface finishes are available for Duplex S31803 Plate?
A4: We supply 2B, BA, No.1, No.4, HL, and mirror-polished finishes according to customer requirements.
Q5: How do you ensure safe delivery overseas?
A5: We use seaworthy wooden pallets with waterproof packing, ensuring safe transportation for long-distance shipping.
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