Home > Bright Bars > Duplex & Super Duplex Bright Bars
Inox Steel India is a trusted manufacturer, supplier, and exporter of Duplex & Super Duplex Stainless Steel Bright Bars in grades UNS S31803 (Duplex 2205) and UNS S32750 (Super Duplex 2507). We supply precision-finished bright bars to industries operating in high-corrosion, high-pressure, and chloride-rich environments across India, GCC, Middle East, Africa, Europe, and the Americas.
Our duplex and super duplex bright bars combine the strength of ferritic stainless steel with the corrosion resistance of austenitic stainless steel, offering exceptional performance where conventional stainless steels fail. Using advanced cold drawing, peel turning, polishing, and centerless grinding, we deliver bright bars with tight tolerances, smooth surface finish, and consistent metallurgical structure.
Duplex and Super Duplex Bright Bars are cold-finished stainless steel bars produced from nitrogen-alloyed duplex grades, designed to provide high yield strength, excellent resistance to pitting and crevice corrosion, and superior stress corrosion cracking (SCC) resistance.
Manufacturing Process Flow:
1️⃣ Grade-Specific Billet Selection – S31803 (22% Cr) and S32750 (25% Cr)
2️⃣ Hot Rolling / Forging – Primary bar formation
3️⃣ Cold Drawing / Peeling – Improves dimensional accuracy and strength
4️⃣ Solution Annealing – Ensures balanced austenite-ferrite microstructure
5️⃣ Polishing / Centerless Grinding – Achieves superior surface finish and roundness
6️⃣ Final Inspection & Testing – Chemical, mechanical, ferrite, and corrosion checks
This controlled process ensures bright bars with predictable mechanical properties, long service life, and reliability in aggressive service conditions.
Key Advantages of Duplex & Super Duplex Bright Bars
✔ High yield strength (nearly twice that of austenitic stainless steels)
✔ Excellent resistance to pitting, crevice corrosion, and SCC
✔ Superior performance in seawater and chloride environments
✔ Tight dimensional tolerances (h8 / h9 / h10)
✔ Reduced material thickness and weight due to higher strength
✔ Full traceability with certified test reports
Both grades are supplied with EN 10204 3.1 / 3.2 certification, ensuring compliance with ASTM, EN, and NACE standards.
Applications of Duplex & Super Duplex Bright Bars by Grade
Duplex and Super Duplex Stainless Steel Bright Bars supplied by Inox Steel India are specifically engineered for high-pressure, high-chloride, and corrosive environments where standard austenitic stainless steels (304/316) are inadequate. The selection between S31803 (Duplex 2205) and S32750 (Super Duplex 2507) depends on chloride concentration, mechanical load, and service severity.
Grade-Wise Application Breakdown
INOX Steel India supplies duplex and super duplex bright bars in a wide range of standard and custom sizes to meet EPC and OEM requirements.
High yield strength allows designers to reduce section thickness, optimizing weight and material cost without compromising safety.
Surface Finish & Machining Performance
Machining Considerations:
✔ Controlled cutting parameters recommended
✔ Use of carbide tooling for optimal performance
✔ Stable machining in solution-annealed condition
✔ Excellent surface integrity after machining
| Grade | Approx. Price (INR / kg – Ex-Mumbai) | Approx. Price (USD / kg – FOB India) |
|---|---|---|
| Duplex 2205 (S31803) | ₹ 420 – ₹ 580 | $ 5.05 – $ 6.95 |
| Super Duplex 2507 (S32750) | ₹ 650 – ₹ 900 | $ 7.85 – $ 10.80 |
Prices are indicative and vary based on size, finish, tolerance, and certification (NACE / G48).
HSN / HS Code
Testing & Quality Assurance
Every duplex and super duplex bright bar supplied by Inox Steel India undergoes stringent inspection to ensure performance in aggressive environments:
All supplies are delivered with EN 10204 3.1 / 3.2 Mill Test Certificates, and NACE MR0175 / MR0103 compliance where required.
Inox Steel India is a reliable manufacturer, supplier, and exporter of Duplex & Super Duplex Stainless Steel Bright Bars, supporting critical industries that operate in aggressive corrosion, high-pressure, and marine environments. Our S31803 and S32750 bright bars are trusted for their exceptional strength, corrosion resistance, and long-term reliability.
Our Core Strengths:
✅ Manufacturer & bulk stockholder
✅ Grades: Duplex 2205 (S31803) & Super Duplex 2507 (S32750)
✅ Precision finishes: Cold drawn, polished, centerless ground
✅ Tight tolerances: h8 / h9 / h10
✅ Solution annealed supply condition
✅ EN 10204 3.1 / 3.2 certification
✅ NACE MR0175 / MR0103 compliance
✅ Export-ready packaging & documentation
Industries & Applications We Serve
| Industry | Typical Components | Preferred Grade |
|---|---|---|
| Marine & Offshore | Shafts, fasteners, fittings | S32750 |
| Oil & Gas | Valves, connectors, pump parts | S31803 / S32750 |
| Desalination Plants | Seawater handling components | S32750 |
| Chemical Processing | Heat exchanger parts, reactors | S31803 |
| Power & Energy | Pressure equipment components | S31803 |
Each application is supported with correct grade selection, corrosion assessment, and certification compliance.
Export Readiness & Packaging
All duplex and super duplex bright bars are packed to meet international export standards:
Yes, duplex and super duplex bright bars are widely used in marine and offshore environments due to high pitting and SCC resistance.
Super Duplex 2507 typically has a PREN value greater than 40, indicating very high pitting resistance.
Yes, we supply duplex and super duplex bright bars compliant with NACE MR0175 / MR0103.
The standard HSN code is 7222.
Yes, we supply custom cut lengths as per drawing and machining allowance.