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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.
This controlled process ensures bright bars with predictable mechanical properties, long service life, and reliability in aggressive service conditions.
Both grades are supplied with EN 10204 3.1 / 3.2 certification, ensuring compliance with ASTM, EN, and NACE standards.
DUPLEX & SUPER DUPLEX STAINLESS STEEL BRIGHT BARS – MASTER TECHNICAL DATA SHEET
Grades: UNS S31803 (Duplex 2205) | UNS S32750 (Super Duplex 2507)
| Parameter / Property | Duplex 2205 Bright Bar (UNS S31803 / S32205) | Super Duplex 2507 Bright Bar (UNS S32750) |
|---|---|---|
| Material Type | Duplex Stainless Steel (Austenitic–Ferritic) | Super Duplex Stainless Steel (Austenitic–Ferritic) |
| UNS Number | S31803 / S32205 | S32750 |
| ASTM Standard | ASTM A276 / A479 | ASTM A276 / A479 |
| EN Equivalent | EN 1.4462 | EN 1.4410 |
| DIN Equivalent | X2CrNiMoN22-5-3 | X2CrNiMoN25-7-4 |
| IS Standard | IS 7904 (equivalent) | IS 7904 (equivalent) |
| Manufacturing Process | Cold Drawn / Peeled / Polished / Centerless Ground | Cold Drawn / Peeled / Polished / Centerless Ground |
| Available Forms | Round, Square, Hex, Flat Bright Bars | Round, Square, Hex, Flat Bright Bars |
| Diameter Range (Round) | 5 – 150 mm | 5 – 150 mm |
| Square / Hex Size | 6 – 100 mm | 6 – 100 mm |
| Standard Length | 3 – 6 meters | 3 – 6 meters |
| Custom Cut Lengths | As per drawing / requirement | As per drawing / requirement |
| Tolerance | h8 / h9 / h10 | h8 / h9 / h10 |
| Supply Condition | Solution Annealed | Solution Annealed |
| Tensile Strength (MPa) | ≥ 620 | ≥ 800 |
| Yield Strength (MPa) | ≥ 450 | ≥ 550 |
| Elongation (%) | ≥ 25 | ≥ 25 |
| Hardness (HB max) | ≤ 290 | ≤ 310 |
| PREN Value | ~35 | ≥ 40 |
| Carbon (C % max) | 0.03 | 0.03 |
| Chromium (Cr %) | 21 – 23 | 24 – 26 |
| Nickel (Ni %) | 4.5 – 6.5 | 6 – 8 |
| Molybdenum (Mo %) | 2.5 – 3.5 | 3 – 5 |
| Nitrogen (N %) | 0.14 – 0.20 | 0.24 – 0.32 |
| Corrosion Resistance | Excellent (Chloride & SCC resistant) | Superior (High chloride & seawater resistant) |
| Pitting / Crevice Resistance | Very High | Extremely High |
| Machinability | Moderate | Moderate |
| Weldability | Good (controlled procedures) | Good (specialized procedures) |
| Surface Finish | Bright Cold Drawn / Polished / Centerless Ground | Bright Cold Drawn / Polished / Centerless Ground |
| Testing Performed | Chemical, Mechanical, PMI, Ferrite | Chemical, Mechanical, PMI, Ferrite, ASTM G48 |
| Certification | EN 10204 3.1 / 3.2, ISO 9001 | EN 10204 3.1 / 3.2, ISO 9001, NACE |
| NACE Compliance | MR0175 / MR0103 | MR0175 / MR0103 |
| HSN / HS Code | 7222 | 7222 |
| Typical Applications | Marine, chemical, heat exchangers, pressure vessels | Offshore, subsea, desalination, oil & gas |
| Packaging | HDPE wrap / Wooden pallets / Export seaworthy | HDPE wrap / Wooden pallets / Export seaworthy |
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.
High yield strength allows designers to reduce section thickness, optimizing weight and material cost without compromising safety.
Machining Considerations:
| 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 Code (India): 7222
HS Code (Export): 7222.20 / 7222.30
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:
| 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.
All duplex and super duplex bright bars are packed to meet international export standards:
Export Destinations:
UAE · Saudi Arabia · Oman · Qatar · Nigeria · South Africa · Germany · Italy · UK · USA · Brazil
Ports of Dispatch:
JNPT (Mumbai) · Mundra · Hazira
At Inox Steel India, we supply precision-finished duplex and super duplex bright bars engineered for maximum corrosion resistance, strength, and service life.
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
steel@inoxsteelindia.in
+91 9930796690
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.
Inox Steel India is a leading manufacturer and exporter of duplex & super duplex bright bars (S31803, S32750). NACE compliant, precision finished & export-ready. Supplier near Alankar Cinema, Mumbai.