Duplex Steel S31803 Instrumentation Tubes, SS 31803 Instrumentation Tubes, 31803 Stainless Steel Instrumentation Tube Manufacturer, SS 31803 Instrumentation Tube Supplier, SS 31803 Instrumentation Tube Exporter, Stainless Steel 31803 Precision Tubing, SS 31803 Small Diameter Tube ,SS 31803 Instrumentation Tubes
Duplex Steel S31803 Instrumentation Tubes are precision-engineered tubing solutions manufactured from duplex stainless steel grade UNS S31803, also known as Duplex 2205. This material combines the favorable properties of both austenitic and ferritic stainless steels, offering superior strength, excellent corrosion resistance, and high durability. These characteristics make S31803 an ideal choice for instrumentation systems operating in challenging industrial environments.
One of the most notable advantages of Duplex S31803 is its enhanced resistance to localized corrosion such as pitting and crevice corrosion, particularly in chloride-containing environments. It also offers excellent resistance to stress corrosion cracking, which is a significant concern in offshore, marine, and chemical processing applications. This makes the tubes particularly well-suited for harsh and corrosive service conditions, where conventional stainless steels like 304 or 316 may not perform adequately.
These instrumentation tubes are typically used in applications involving high-pressure fluid or gas transmission, precise flow control, and analytical measurements. Common industries include oil and gas, petrochemical, power generation, desalination, and pulp and paper. Their reliability in maintaining system integrity and pressure containment is critical for the safe and efficient operation of control and instrumentation equipment.
Manufactured in accordance with international standards such as ASTM A789, A790, and ASME SA789, Duplex Steel S31803 Instrumentation Tubes are available in seamless or welded form, with various sizes, wall thicknesses, and surface finishes to suit specific project requirements. The tubes undergo rigorous quality control and testing to ensure high dimensional accuracy, pressure tolerance, and surface integrity, which are vital for sensitive instrumentation setups.
Specification of Duplex Steel S31803 Instrumentation Tubes
| Property | Specification |
|---|---|
| Material Grade | Duplex Stainless Steel UNS S31803 (1.4462) |
| Product Type | Instrumentation Tubes |
| Standards | ASTM A789 / ASTM A790 / ASME SA789 / EN 10216-5 |
| Form | Seamless, Welded |
| Outer Diameter (OD) | 1/8" to 2" (3.18 mm to 50.8 mm) |
| Wall Thickness | 0.028" to 0.120" (0.71 mm to 3.05 mm) or as per customer requirement |
| Length | Straight lengths up to 6 meters (custom lengths available), coils on request |
| Surface Finish | Bright Annealed, Pickled, Polished, Passivated |
| Yield Strength (0.2% offset) | ≥ 450 MPa |
| Tensile Strength | ≥ 620 MPa |
| Elongation | ≥ 25% |
| Hardness | ≤ 290 HB (Brinell Hardness) |
| Density | 7.8 g/cm³ |
| Operating Temperature | -50°C to +300°C (may vary based on application and standards) |
| Corrosion Resistance | Excellent resistance to pitting, crevice, and stress corrosion cracking |
| Pressure Rating | Suitable for high-pressure applications (varies with size and wall thickness) |
| Microstructure | 50% Ferrite / 50% Austenite (typical) |
| End Finishes | Plain, Beveled, Threaded, or Custom as required |
| Certifications | EN 10204 3.1 / 3.2, NACE MR0175 / ISO 15156, PED 2014/68/EU (on request) |
Overall, Duplex Steel S31803 Instrumentation Tubes offer an excellent balance of mechanical strength, corrosion resistance, and cost-effectiveness. Their long service life and performance in aggressive environments help reduce maintenance costs and downtime, making them a preferred material choice for critical instrumentation and control systems across a wide range of industries.
Chemical Composition of Duplex Steel S31803 Instrumentation Tubes
| Element | Typical Range (wt%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | 1.0 – 2.0 |
| Silicon (Si) | 0.5 – 1.0 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.02 |
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 |
| Copper (Cu) | ≤ 0.5 |
| Iron (Fe) | Balance |
With a proven track record as a Duplex Steel S31803 Instrumentation 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 Instrumentation Tubes
| Property | Specification |
|---|---|
| Material Grade | Duplex Stainless Steel UNS S31803 (1.4462) |
| Product Type | Instrumentation Tubes |
| Standards | ASTM A789 / ASTM A790 / ASME SA789 / EN 10216-5 |
| Form | Seamless, Welded |
| Outer Diameter (OD) | 1/8" to 2" (3.18 mm to 50.8 mm) |
| Wall Thickness | 0.028" to 0.120" (0.71 mm to 3.05 mm) or as per customer requirement |
| Length | Straight lengths up to 6 meters (custom lengths available), coils on request |
| Surface Finish | Bright Annealed, Pickled, Polished, Passivated |
| Yield Strength (0.2% offset) | ≥ 450 MPa |
| Tensile Strength | ≥ 620 MPa |
| Elongation | ≥ 25% |
| Hardness | ≤ 290 HB (Brinell Hardness) |
| Density | 7.8 g/cm³ |
| Operating Temperature | -50°C to +300°C (may vary based on application and standards) |
| Corrosion Resistance | Excellent resistance to pitting, crevice, and stress corrosion cracking |
| Pressure Rating | Suitable for high-pressure applications (varies with size and wall thickness) |
| Microstructure | 50% Ferrite / 50% Austenite (typical) |
| End Finishes | Plain, Beveled, Threaded, or Custom as required |
| Certifications | EN 10204 3.1 / 3.2, NACE MR0175 / ISO 15156, PED 2014/68/EU (on request) |
🏭 Industry & Application
- ✅ SS 31803 Instrumentation Tubes for Medical Industry
- ✅ SS 31803 Instrumentation Tubes for Chemical Processing
- ✅ SS 31803 Tubes for Instrumentation Lines
- ✅ Duplex Steel S31803 Instrumentation Tubes for Gas & Liquid Flow
- ✅ SS 31803 Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1: What is Duplex Steel S31803?
Duplex Steel S31803, also known as UNS S31803 or Duplex 2205, is a duplex stainless steel grade that combines approximately equal amounts of austenite and ferrite phases. This composition gives it higher strength and better corrosion resistance than conventional stainless steels like 304 or 316.
Q2: What are Duplex S31803 Instrumentation Tubes used for?
These tubes are used in instrumentation and control systems across industries such as oil & gas, petrochemical, power generation, marine, and chemical processing, where corrosion resistance and mechanical strength under pressure are critical.
Q3:What standards do Duplex S31803 Instrumentation Tubes comply with?
Common standards include ASTM A789/A790, ASME SA789/SA790, and EN 10216-5. These standards define chemical composition, mechanical properties, dimensions, and testing requirements.
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