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Pathan Durgadevi Udyan, Ground Floor, 25 Plot No 74/80, Patra Chawl, Maruti , Mandir Marg, Second Street, Girgaon, Mumbai, Maharashtra 400004Tubotech Alloys is a leading manufacturer, supplier, and exporter of Duplex Steel 31803 / 32205 Fasteners in Italy, offering high-performance fastening solutions for demanding industrial applications. Our Duplex Steel fasteners are engineered to provide superior strength, excellent corrosion resistance, and exceptional durability in aggressive environments. These fasteners are widely used across industries such as oil & gas, petrochemicals, offshore platforms, marine engineering, chemical processing, power generation, and desalination plants.
Duplex Steel UNS S31803 and UNS S32205 Fasteners combine the advantages of both austenitic and ferritic stainless steels, delivering excellent resistance to stress corrosion cracking, pitting, crevice corrosion, and chloride-induced corrosion. Tubotech Alloys supplies precision-manufactured fasteners that comply with international quality standards and customer-specific requirements.
Tubotech Alloys offers a comprehensive range of Duplex Steel 31803 / 32205 Fasteners, including:
Available in metric and imperial sizes with customized coatings, threads, and dimensions.
| Element | UNS S31803 (%) | UNS S32205 (%) |
|---|---|---|
| Chromium (Cr) | 21.0 – 23.0 | 22.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 | 3.0 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 | 0.14 – 0.20 |
| Carbon (C) | ≤ 0.03 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.0 | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.03 | ≤ 0.03 |
| Sulfur (S) | ≤ 0.02 | ≤ 0.02 |
| Iron (Fe) | Balance | Balance |
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa Min |
| Yield Strength | 450 MPa Min |
| Elongation | 25% Min |
| Hardness | 290 HB Max |
| Density | 7.8 g/cm³ |
| Modulus of Elasticity | 200 GPa |
| Melting Range | 1350 – 1450°C |
These properties make Duplex Steel 31803 / 32205 Fasteners ideal for high-pressure and high-temperature applications.
The superior mechanical strength and corrosion resistance of Duplex Steel Fasteners make them suitable for a variety of industrial sectors:
Used in offshore platforms, subsea systems, pipelines, and refineries where corrosion resistance is essential.
Suitable for equipment exposed to acidic and chloride-containing environments.
Ideal for shipbuilding, marine hardware, seawater systems, and coastal structures.
Used in thermal, nuclear, and renewable energy projects due to excellent durability.
Provides resistance against seawater corrosion and high-salinity conditions.
Widely used in reactors, pressure vessels, heat exchangers, and storage facilities.
Performs effectively in chemically aggressive processing environments.
Used in bridges, structural steel projects, and industrial construction.
These fittings are crucial in ensuring smooth, dependable, and ordinary fluid and gas waft at some stage in various high-stakes programs.
We manufacture fasteners using certified Duplex Steel 31803 and 32205 grades sourced from trusted mills.
Our products comply with ASTM, ASME, DIN, ISO, and EN standards.
Precision machining and strict quality control ensure consistent product performance.
We offer cost-effective fastening solutions without compromising quality.
Fasteners are available in customized sizes, threads, coatings, and specifications.
Tubotech Alloys supplies Duplex Steel Fasteners throughout Italy and international markets with timely deliveries.
All fasteners undergo mechanical, chemical, dimensional, and corrosion resistance testing before dispatch.
| Specification | Details |
|---|---|
| Material Grade | UNS S31803, UNS S32205 |
| Standards | ASTM A182, ASTM A276, ASTM A479 |
| Size Range | M3 to M100 |
| Length | Up to 5 Meters |
| Thread Type | Metric, UNC, UNF, BSW |
| Form | Bolts, Nuts, Screws, Washers, Studs |
| Finish | Plain, Polished, Passivated, PTFE Coated |
| Manufacturing Process | Hot Forged, Cold Forged, CNC Machined |
Tubotech Alloys has established itself as a trusted supplier of Duplex Steel 31803 Fasteners and Duplex Steel 32205 Fasteners in Italy. With a strong commitment to quality, reliability, and customer satisfaction, we provide fastening solutions designed to perform in the most demanding industrial environments. Contact us today for competitive pricing and technical assistance.
Duplex Steel 32205 is an enhanced version of 31803 with tighter control over nitrogen content and improved corrosion resistance properties.
Yes. Their excellent resistance to seawater corrosion and chloride attack makes them ideal for marine and offshore environments.
Oil & gas, petrochemical, marine, power generation, desalination, chemical processing, and infrastructure industries frequently use these fasteners.
Yes. We manufacture customized fasteners according to customer drawings, dimensions, coatings, and specifications.
They offer significantly higher strength, better pitting resistance, superior stress corrosion cracking resistance, and longer service life in harsh environments.
Upgrade your assembly with Tubotech for excellence and built to closing. Contact us nowadays to get a quote or examine more about our product range.
Tubotech delivers precision-engineered tubing, fittings, and fasteners with innovative solutions and customizable options. Trusted for quality and durability, we serve industries requiring reliable, high-performance piping and instrumentation products.
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