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Sumer Metal Industries Private Limited is a leading manufacturer, supplier, and exporter of high-quality Duplex Steel S31803 Needle Tubes. Designed for applications requiring high strength, durability, and corrosion resistance, these tubes are manufactured using advanced melting, extrusion, and cold-drawing processes to ensure precision and superior mechanical performance.
Duplex S31803, also known as Duplex 2205 or UNS S31803 / EN 1.4462, features a unique ferritic–austenitic microstructure. This combination provides excellent mechanical strength, superior pitting and stress corrosion resistance, and better toughness than conventional austenitic stainless steels, making it ideal for high-pressure and chemically aggressive environments.
Our Duplex S31803 Needle Tubes are widely used in instrumentation, medical devices, oil and gas sampling lines, hydraulic and pneumatic systems, chemical processing, and marine applications. Their corrosion resistance and strength make them perfect for thin-walled, high-precision tubing where safety and reliability are critical.
Sumer Metal Industries exports these needle tubes to Oman, Qatar, Saudi Arabia, UAE, Kuwait, Spain, Germany, USA, Canada, and several regions across Africa. Every shipment is accompanied by Mill Test Certificates (MTC) and can include third-party inspection or PMI testing to ensure adherence to international quality standards.
Specification of Duplex Steel S31803 Needle Tubes
| Property / Standard | Detail |
|---|---|
| Material Grade | Duplex Stainless Steel S31803 (UNS S31803 / EN 1.4462) — commercial Duplex 2205 family |
| Standards (typical) | ASTM A789 / A790 (seamless & welded duplex tubes), EN 10216-5 / EN 10312 (where applicable); customer-specific specs accepted |
| Surface finish | Cold-drawn bright / polished / annealed & pickled |
| Delivery condition | Annealed, pickled, straightened, cut-to-length |
| Certificates | Mill Test Certificate (EN 10204 3.1 / 2.1 as requested), PMI/third-party inspection available |
The production process includes vacuum induction melting (where applicable), hot extrusion, precision cold drawing, annealing, and pickling. These processes ensure optimal surface finish, dimensional accuracy, and structural integrity. We also provide custom lengths, end finishing, and packaging tailored for safe transport to global destinations.
Chemical Composition of Duplex Steel S31803 Needle Tubes
| Element | Typical Range (wt.%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Silicon (Si) | ≤ 0.8 |
| Manganese (Mn) | ≤ 2.0 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.02 |
| Chromium (Cr) | 22.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.14 – 0.20 (typical) |
| Iron (Fe) | Balance |
With a proven track record as a Duplex Steel S31803 Needle Tubes exporter in over 30 countries, Sumer Metal Industries ensures global availability, third-party inspection support, and client-specific customization. Our wide export network combined with strict quality standards has made us a preferred choice for SS 31803 tubing worldwide.
Specification of Duplex Steel S31803 Needle Tubes
| Property / Standard | Detail |
|---|---|
| Material Grade | Duplex Stainless Steel S31803 (UNS S31803 / EN 1.4462) — commercial Duplex 2205 family |
| Standards (typical) | ASTM A789 / A790 (seamless & welded duplex tubes), EN 10216-5 / EN 10312 (where applicable); customer-specific specs accepted |
| Surface finish | Cold-drawn bright / polished / annealed & pickled |
| Delivery condition | Annealed, pickled, straightened, cut-to-length |
| Certificates | Mill Test Certificate (EN 10204 3.1 / 2.1 as requested), PMI/third-party inspection available |
🏭 Industry & Application
- ✅ Duplex Steel S31803 Needle Tubes for Medical Industry
- ✅ Duplex Steel S31803 Needle Tubes for Chemical Processing
- ✅ Duplex Steel S31803 Tubes for Needle Lines
- ✅ Duplex Steel S31803 Needle Tubes for Gas & Liquid Flow
- ✅ Duplex Steel S31803 Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
What are Duplex Steel S31803 Needle Tubes used for?
Duplex Steel S31803 Needle Tubes are commonly used in instrumentation, hydraulic systems, chemical processing, marine applications, and high-pressure fluid transfer where superior strength and corrosion resistance are essential.
What are the advantages of Duplex S31803 over standard stainless steel?
Compared to standard austenitic stainless steels, Duplex S31803 offers higher mechanical strength, better resistance to chloride stress corrosion cracking, and excellent pitting resistance, making it ideal for demanding environments.
Do you provide Duplex S31803 Needle Tubes with certifications?
Yes, Sumer Metal Industries supplies Duplex Steel S31803 Needle Tubes with Mill Test Certificates (EN 10204 3.1) and can also arrange third-party inspection, PMI testing, and other certifications as per customer requirements.
What sizes and tolerances are available for Duplex S31803 Needle Tubes?
We manufacture Duplex S31803 Needle Tubes in outside diameters ranging from 0.5 mm to 6 mm with precise wall thicknesses. Custom tolerances and special lengths can be produced as per OEM drawings or project requirements.
Do you export Duplex Steel S31803 Needle Tubes internationally?
Yes, Sumer Metal Industries exports Duplex Steel S31803 Needle Tubes to Oman, Qatar, Saudi Arabia, UAE, Kuwait, Spain, Germany, USA, Canada, and several regions across Africa, ensuring international quality standards and packaging.
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At Sumer Metal Industries Pvt. Ltd., we follow a zero-defect policy by implementing stringent quality checks, using certified raw materials, and continuously improving our processes to deliver reliable and consistent tubing solutions
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