Inox Steel India is a trusted manufacturer, supplier, and exporter of Duplex & Super Duplex Stainless Steel Round Bars in grades UNS S31803 / S32205 (Duplex 2205) and UNS S32750 (Super Duplex 2507), supplied in compliance with ASTM A479 / ASTM A276 standards.
Our duplex and super duplex round bars are widely used in offshore, marine, oil & gas, desalination, chemical processing, and high-chloride environments, where strength and corrosion resistance must perform together.
With consistent stock availability in hot rolled, forged, bright drawn, and peeled & polished conditions, Inox Steel India supports critical engineering projects and export requirements across India, GCC, Middle East, Africa, Europe, and the Americas.
Inox Steel India is a trusted manufacturer, supplier, and exporter of Duplex & Super Duplex Stainless Steel Round Bars in grades UNS S31803 / S32205 (Duplex 2205) and UNS S32750 (Super Duplex 2507), supplied in compliance with ASTM A479 / ASTM A276 standards.
Our duplex and super duplex round bars are widely used in offshore, marine, oil & gas, desalination, chemical processing, and high-chloride environments, where strength and corrosion resistance must perform together.
With consistent stock availability in hot rolled, forged, bright drawn, and peeled & polished conditions, Inox Steel India supports critical engineering projects and export requirements across India, GCC, Middle East, Africa, Europe, and the Americas.
Duplex and super duplex round bars are solid stainless steel bars engineered with a dual-phase microstructure (austenite + ferrite). This structure provides a unique combination of high mechanical strength, excellent resistance to pitting and crevice corrosion, and superior stress corrosion cracking resistance.
Compared to conventional austenitic stainless steels, duplex grades offer almost double the yield strength, allowing lighter and more efficient component design.
This controlled process ensures duplex and super duplex round bars capable of long-term service in aggressive and chloride-rich environments.
Duplex 2205 (UNS S31803 / S32205) – Balanced strength and corrosion resistance for marine and chemical service
Super Duplex 2507 (UNS S32750) – Enhanced pitting resistance for severe chloride and offshore environments
Applicable Standards:
ASTM A479 / ASTM A276
EN equivalents available on request
Master Technical Datasheet provided above applies to all grades.
India: Chemical plants, desalination units, offshore fabricators, and pump manufacturers in Mumbai, Chennai, Gujarat, and coastal regions.
GCC & Middle East: Offshore platforms, seawater piping, valves, and subsea components.
Europe & Americas: High-integrity marine, energy, and chemical processing equipment.
Inox Steel India supports these markets with ready stock, export documentation, and consistent supply schedules.
| Industry / Sector | Typical Applications | Preferred Grades |
| Oil & Gas | Shafts, valve components, connectors | Duplex 2205 |
| Offshore & Marine | Propeller shafts, fasteners, risers | Super Duplex 2507 |
| Desalination Plants | Pump shafts, seawater handling parts | Super Duplex 2507 |
| Chemical Processing | Reactor internals, agitator shafts | Duplex 2205 |
| Power & Energy | High-strength mechanical components | Duplex 2205 |
| Pulp & Paper | Digesters, pressure-loaded parts | Duplex 2205 |
Standard Diameter Range (mm):
6, 8, 10, 12, 16, 20, 25, 32, 40, 50, 65, 80, 100 and above up to 350 mm
Length Options:
Random Lengths
Fixed Lengths
Custom Cut-to-Length
Finish Options:
Hot Rolled (Black)
Bright Drawn
Peeled & Polished
Weight (kg/m) = (D² × 0.006165)
Where D = Diameter in mm
| Grade | Approx. Price INR/kg | Typical Use |
| Duplex 2205 (S31803 / S32205) | ₹ 380 – ₹ 580 | Marine & chemical service |
| Super Duplex 2507 (S32750) | ₹ 620 – ₹ 950 | Offshore & high-chloride environments |
Prices are indicative and subject to change based on alloy surcharge, certification, and size.
HSN Code: 7222
Documentation Supplied:
EN 10204 3.1 / 3.2 Mill Test Certificate
NACE MR0175 / MR0103 compliance (on request)
Third-Party Inspection (SGS / BV / TUV) on request
| Industry | Application |
| Offshore & Marine | Shafts, fasteners, risers |
| Oil & Gas | Valves, connectors, pressure parts |
| Desalination | Pump shafts, seawater systems |
| Chemical Processing | Reactor internals, agitators |
| Power & Energy | High-strength mechanical components |
| Pulp & Paper | Digesters, pressure-loaded parts |
Export Destinations:
UAE, Saudi Arabia, Oman, Qatar, Nigeria, South Africa, Germany, Italy, USA, and other global markets.
Dispatch through JNPT (Mumbai), Mundra, and Hazira ports.
If you are searching for a duplex or super duplex round bar supplier near Alankar Cinema, Mumbai, Inox Steel India offers immediate availability, certified material, and nationwide as well as export delivery support.
Q1. What is the difference between duplex and super duplex round bars?
Super duplex 2507 has higher chromium, molybdenum, and nitrogen content, providing superior pitting and crevice corrosion resistance.
Q2. What is the typical price of duplex round bars in India?
Duplex round bar prices generally range from ₹380 – ₹580 per kg.
Q3. Where are super duplex round bars commonly used?
Offshore platforms, desalination plants, and high-chloride environments.
Q4. What is the HSN code for duplex and super duplex round bars?
HSN code is 7222.
Q5. Do duplex round bars require special welding procedures?
Yes, controlled heat input and suitable filler metals are required.
Q6. Do you supply peeled & polished duplex round bars?
Yes, peeled & polished duplex and super duplex bars are available.