Home > Round Bars > Duplex & Super Duplex Round Bars
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.
At Inox Steel India, duplex and super duplex round bars are manufactured using controlled metallurgical processes to ensure precise phase balance and consistent mechanical properties.
This process ensures duplex and super duplex round bars capable of long-term service in aggressive and chloride-rich environments.
These advantages make duplex and super duplex round bars ideal for critical rotating parts, shafts, valves, and pressure-loaded components.
Inox Steel India supplies duplex stainless steel round bars in the following grades:
Applicable Standards: ASTM A479 / ASTM A276 | EN equivalents available on request.
MASTER TECHNICAL DATA SHEET:
Duplex & Super Duplex Round Bars
| Parameter | Duplex 2205 (UNS S31803 / S32205) | Super Duplex 2507 (UNS S32750) |
|---|---|---|
| Product Form | Solid Round Bar | Solid Round Bar |
| Material Category | Duplex Stainless Steel (22% Cr) | Super Duplex Stainless Steel (25% Cr) |
| Standard | ASTM A479 / ASTM A276 | ASTM A479 / ASTM A276 |
| EN / DIN Equivalent | EN 1.4462 | EN 1.4410 |
| Manufacturing Process | Hot Rolled / Forged / Bright Drawn | Hot Rolled / Forged / Bright Drawn |
| Diameter Range (mm) | 6 – 350 mm | 6 – 300 mm |
| Standard Sizes (mm) | 8, 10, 12, 16, 20, 25, 32, 40, 50, 65, 80, 100 | Same as Duplex |
| Length | Random / Fixed / Cut-to-Length | Random / Fixed / Cut-to-Length |
| Surface Finish | Black / Bright / Peeled & Polished | Black / Bright / Peeled & Polished |
| Density (g/cm³) | ~7.8 | ~7.8 |
| Chemical Composition (Typical %) | Cr 21–23, Ni 4.5–6.5, Mo 2.5–3.5, N 0.14–0.20, C ≤0.03 | Cr 24–26, Ni 6–8, Mo 3–5, N 0.24–0.32, C ≤0.03 |
| Tensile Strength (MPa) | ≥ 620 | ≥ 800 |
| Yield Strength (MPa) | ≥ 450 | ≥ 550 |
| Elongation (%) | ≥ 25 | ≥ 25 |
| Hardness | ≤ 290 HB | ≤ 310 HB |
| Corrosion Resistance | Excellent in chloride & marine environments | Superior pitting/crevice resistance for high-chloride service |
| Temperature Service (Guideline) | Up to ~250–300°C | Up to ~250–300°C (avoid prolonged 300–350°C exposure) |
| Heat Treatment | Solution Annealed | Solution Annealed |
| Typical Applications | Shafts, valves, pump parts, marine fittings, chemical components | Offshore, subsea, desalination, high-chloride plants, chemical pumps |
| Testing | Chemical, Mechanical, UT, PMI, Ferrite Test | Chemical, Mechanical, UT, PMI, Ferrite Test, ASTM G48 (pitting) when required |
| Certification | EN 10204 3.1 / 3.2, PED (if required) | EN 10204 3.1 / 3.2, PED, NACE MR0175/MR0103 (if required) |
| HSN / HS Code | 7222 (stainless steel bars/rods) | 7222 (stainless steel bars/rods) |
| Export Suitability | Domestic & Export | Export (critical service) |
Selecting the correct duplex or super duplex round bar grade depends on the operating environment and project constraints:
Inox Steel India maintains stock readiness and export documentation to support consistent global supply schedules.
Duplex and super duplex round bars supplied by Inox Steel India are engineered for applications requiring high strength and exceptional corrosion resistance.
| 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 |
These applications demand resistance to stress corrosion cracking and long service life.
Inox Steel India supplies duplex and super duplex round bars in a comprehensive size range suitable for machining, forging, and structural applications.
Standard Diameter Range (mm)
6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 32 mm, 40 mm, 50 mm, 65 mm, 80 mm, 100 mm and above up to 350 mm
Length Options
Finish Options
Bright and peeled bars are preferred for precision machining and rotating components.
The standard formula used for estimating round bar weight:
Weight (kg/m) = (D² × 0.006165)
Where D = Diameter in mm
This formula is commonly used for material planning and logistics estimation.
| 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 (NACE), and size.
Every duplex and super duplex round bar supplied by Inox Steel India undergoes stringent quality control and inspection.
Quality Tests Conducted
Documentation Supplied
These measures ensure material reliability, safety, and acceptance in offshore and chemical projects.
Inox Steel India is a dependable duplex and super duplex round bar manufacturer and supplier in Mumbai, serving high-performance stainless steel requirements for critical marine and chemical applications.
Our Key Strengths
Our focus is on helping buyers select the correct grade and size for long-term performance and cost efficiency.
| 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 |
Each industry is supported with material traceability, technical guidance, and timely dispatch.
All duplex and super duplex round bars are packed to ensure safe handling and corrosion protection:
Export Destinations:
UAE, Saudi Arabia, Oman, Qatar, Nigeria, South Africa, Germany, Italy, USA, and other global markets.
Dispatch is arranged 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 with certified material, competitive pricing, and fast delivery across Maharashtra and major industrial regions of India.
Duplex & Super Duplex Round Bars Manufacturer & Supplier – S31803, S32750 | Inox Steel India
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
steel@inoxsteelindia.in
+91 9930796690
Duplex round bar prices generally range from ₹380 – ₹580 per kg, depending on size and finish. They are widely used in offshore platforms, desalination plants, and high-chloride chemical environments. The HSN code is 7222. Yes, controlled heat input and suitable filler metals are recommended to maintain phase balance. Yes, we supply peeled & polished duplex and super duplex round bars for precision applications. What is the typical price of duplex round bars in India?
Where are super duplex round bars commonly used?
What is the HSN code for duplex and super duplex round bars?
Do duplex round bars require special welding procedures?
Do you supply peeled and polished duplex round bars?
Inox Steel India is a leading duplex and super duplex round bar manufacturer and supplier in India. UNS S31803 (2205) & UNS S32750 (2507) round bars as per ASTM A479/A276 with export supply.