Duplex Steel S31803 Capillary Tubes, SS 31803 Capillary Tubes, 31803 Stainless Steel Capillary Tube Manufacturer, SS 31803 Capillary Tube Supplier, SS 31803 Capillary Tube Exporter, Stainless Steel 31803 Precision Tubing, SS 31803 Small Diameter Tube ,SS 31803 Instrumentation Tubes
Sumer Metal Industries Private Limited is a reputed manufacturer, supplier, and exporter specializing in Duplex Stainless Steel S31803 Capillary Tubes. These high-quality tubes are exported to key markets including Oman, Qatar, Saudi Arabia, UAE, Kuwait, Spain, Germany, USA, Canada, and multiple regions across Africa.
Duplex S31803 (UNS S31803, EN 1.4462) capillary tubes are duplex (ferritic‑austenitic) stainless steel, offering higher strength and enhanced resistance to corrosion (especially chloride stress and pitting) compared with common austenitics like 304 or 316. This is largely due to the balance of their microstructure and elevated levels of chromium, molybdenum, and nitrogen.
These tubes typically conform to standards such as ASTM A789 / A790 and are available in capillary sizes—outer diameters from ~0.28 mm to 10 mm, wall thicknesses from ~0.08 mm to 1.2 mm, tailor-made as per client requirements.
Sumer Metal Industries Private Limited utilizes state-of-the-art manufacturing technologies to ensure their Duplex Steel S31803 Capillary Tubes meet stringent international standards such as ASTM, ASME, DIN, and EN. The production process includes cold drawing, annealing, pickling, and high-precision testing to achieve ultra-fine tube dimensions with tight tolerances. Every tube undergoes non-destructive testing (NDT), hydrostatic testing, and is certified for dimensional accuracy and pressure handling. This ensures high quality and consistency across large production volumes.
Specification of Duplex Steel S31803 Capillary Tubes
| Property | Specification Details |
|---|---|
| Material Grade | Duplex Stainless Steel S31803 (UNS S31803 / 1.4462 / 2205) |
| Standards | ASTM A789 / A790, ASME SA789 / SA790, EN 10216-5, DIN 17458 |
| Tube Outer Diameter (OD) | 0.28 mm to 10.00 mm (custom sizes available) |
| Wall Thickness | 0.08 mm to 1.20 mm |
| Length | Up to 30 meters (straight or coiled form) |
| Form | Seamless, Welded, Cold Drawn |
| Surface Finish | Bright Annealed, Polished, Pickled |
| Tolerance | ±0.05 mm (OD), ±10% (thickness), or as per customer request |
| Production Technique | Cold Drawing, Annealing, Precision Cutting |
| End Type | Plain End, Beveled End, Threaded End, or Custom Ends |
| Packaging | Plastic caps, sealed ends, shrink-wrapped bundles, wooden box |
| Certification | EN 10204 3.1 / 3.2, ISO 9001:2015, PED, NACE MR0175 |
| Testing | PMI, Hydrostatic, Eddy Current, Ultrasonic, Mechanical Testing |
| Applications | Instrumentation, Oil & Gas, Chemical, Marine, Medical, Pharma |
Duplex S31803 Capillary Tubes are especially critical in instrumentation, flow control systems, and chromatography where tight dimensional control and surface finish are non-negotiable. These tubes are designed to carry liquids and gases under high pressure, with minimal wall thickness and superior surface cleanliness—factors that reduce the risk of contamination and fluid loss. Their high strength allows for miniaturized systems without compromising structural integrity, making them the preferred choice in precision industries.
Chemical Composition of Duplex Steel S31803 Capillary Tubes
| Element | Minimum (%) | Maximum (%) | Purpose / Role |
|---|---|---|---|
| Carbon (C) | – | 0.030 | Limits carbide precipitation; improves weldability |
| Manganese (Mn) | – | 2.00 | Improves hot working and strength |
| Silicon (Si) | – | 1.00 | Enhances oxidation resistance |
| Phosphorus (P) | – | 0.030 | Should be kept low to avoid embrittlement |
| Sulfur (S) | – | 0.020 | Low levels improve corrosion resistance and weldability |
| Chromium (Cr) | 21.0 | 23.0 | Provides corrosion and oxidation resistance |
| Nickel (Ni) | 4.5 | 6.5 | Stabilizes austenite phase; improves toughness and corrosion |
| Molybdenum (Mo) | 2.5 | 3.5 | Improves pitting and crevice corrosion resistance |
| Nitrogen (N) | 0.14 | 0.20 | Strengthens austenite and increases resistance to corrosion |
| Iron (Fe) | Balance | Balance | Base metal |
With a proven track record as a Duplex Steel S31803 Capillary 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 Capillary Tubes
| Property | Specification Details |
|---|---|
| Material Grade | Duplex Stainless Steel S31803 (UNS S31803 / 1.4462 / 2205) |
| Standards | ASTM A789 / A790, ASME SA789 / SA790, EN 10216-5, DIN 17458 |
| Tube Outer Diameter (OD) | 0.28 mm to 10.00 mm (custom sizes available) |
| Wall Thickness | 0.08 mm to 1.20 mm |
| Length | Up to 30 meters (straight or coiled form) |
| Form | Seamless, Welded, Cold Drawn |
| Surface Finish | Bright Annealed, Polished, Pickled |
| Tolerance | ±0.05 mm (OD), ±10% (thickness), or as per customer request |
| Production Technique | Cold Drawing, Annealing, Precision Cutting |
| End Type | Plain End, Beveled End, Threaded End, or Custom Ends |
| Packaging | Plastic caps, sealed ends, shrink-wrapped bundles, wooden box |
| Certification | EN 10204 3.1 / 3.2, ISO 9001:2015, PED, NACE MR0175 |
| Testing | PMI, Hydrostatic, Eddy Current, Ultrasonic, Mechanical Testing |
| Applications | Instrumentation, Oil & Gas, Chemical, Marine, Medical, Pharma |
🏭 Industry & Application
- ✅ SS 31803 Capillary Tubes for Medical Industry
- ✅ SS 31803 Capillary Tubes for Chemical Processing
- ✅ SS 31803 Tubes for Instrumentation Lines
- ✅ Duplex Steel S31803 Capillary Tubes for Gas & Liquid Flow
- ✅ SS 31803 Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1:What distinguishes Duplex Steel S31803 capillary tubes from standard stainless steel?
Duplex S31803 features a dual microstructure offering enhanced strength and corrosion resistance compared to traditional austenitic stainless steels.
Q2: Can S31803 capillary tubes be used in high-chloride environments?
Yes—this grade excels in chloride-rich and aggressive media such as seawater and chemical processing settings.
Q3:Are S31803 capillary tubes compatible with welding and fabrication without heat treatment?
Indeed—thanks to their duplex structure, they generally don't require post-weld heat treatment, simplifying fabrication processes.
Duplex Steel S31803 Capillary Tubes exporter
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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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