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Super Duplex S31803 | Product Overview
Introduction To Duplex Stainless Steel S31803
Duplex Stainless Steel S31803 is a ferritic austenitic stainless steel that combines excellent corrosion resistance with high mechanical strength. It is one of the most widely used duplex grades, containing about 22% chromium, 5–6% nickel, and 3% molybdenum, along with nitrogen to enhance corrosion resistance.
S31803 is designed for use in severe environments where pitting, crevice corrosion, and stress corrosion cracking are a concern. MOKSH TUBES & FITTINGS LLP is a trusted supplier, exporter, importer, and stockist of Duplex S31803 products such as pipes, tubes, fittings, flanges, plates, and custom components.
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 |
| Iron (Fe) | Balance |
Technical Composition
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 620 – 880 MPa |
| Yield Strength (0.2% Offset) | 450 – 550 MPa |
| Elongation | 25 – 30% |
| Hardness | 290 HB (max) |
| Density | 7.8 g/cm³ |
Products in Duplex Stainless Steel S31803
Duplex Stainless Steel S31803 is available in a variety of mill forms:
We supply Duplex Stainless Steel S31803 materials in accordance with the most stringent industry standards:
Uses and Advantages
Excellent resistance to chloride-induced stress corrosion cracking
Superior pitting and crevice corrosion resistance compared to austenitic stainless steels
Twice the yield strength of conventional austenitic stainless steels
Good weldability and formability
Durable performance in harsh environments
Cost effective solution for many demanding applications
Applications of Duplex Stainless Steel S31803
Duplex Stainless Steel S31803 is widely used across multiple industries due to its excellent strength, corrosion resistance, and machinability:
Chemical Processing
Reactors, heat exchangers, and piping systems for chemical processing equipment.
Oil & Gas Industry
Subsea equipment, risers, and pipelines for oil & gas applications.
Marine Engineering
Seawater systems and offshore structures with high corrosion resistance.
Desalination Plants
Equipment used in desalination plants operating in saline environments.
Pulp & Paper Industry
Machinery and piping used in pulp and paper production processes.
Pressure Vessels & Storage Tanks
Vessels and tanks used in corrosive conditions for safe storage and processing.
WHY CHOOSE US?
FAQ's
What is Duplex Stainless Steel S31803 used for?
It is widely used in chemical processing, marine engineering, desalination, and oil & gas applications.
Is Duplex S31803 weldable?
Yes, but proper welding procedures and post-weld heat treatment are recommended for maintaining optimum corrosion resistance and mechanical strength.
Can S31803 be used in seawater environments?
Yes, it provides excellent seawater corrosion resistance but is slightly less resistant than Super Duplex grades.
How does S31803 compare to 2205?
S31803 is more cost-effective for general use but offers slightly lower corrosion resistance compared to Super Duplex 2205.
Contact Us
For inquiries, pricing, or customized Duplex Stainless Steel S31803 solutions, Moksh Tubes & Fittings LLP your reliable partner in Duplex Stainless Steel S31803.
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