Duplex Steel Bars

A duplex steel bar is a solid, semi-finished metal product made from a dual-phase stainless steel alloy combining a ferritic and austenitic microstructure in roughly equal proportions. The most common grades are S31803, S32205, and 2205, with chromium content ranging from 21–23% and molybdenum at 2.5–3.5%. This two-phase structure delivers twice the yield strength of standard austenitic stainless grades, reaching a minimum of 450 MPa, along with outstanding resistance to chloride-induced stress corrosion cracking. Duplex stainless steel bars are used in oil & gas, chemical, marine, and construction industries where both strength and corrosion resistance are essential.

Duplex Steel Bar Price:

The price of a duplex steel bar depends on its grade, size, and order quantity. Understanding the cost structure enables procurement teams and engineers to plan the budget accurately.

Approximate Price Range:

Duplex steel bars cost between Rs. 350 and Rs. 500 per kg for standard grades and profiles. Super duplex grades, such as 2507 or S32750, have higher prices due to increased nickel and molybdenum content.

Factors Affecting Price:

• Grade and alloy content: Higher-alloy grades like S32750 and S32760 cost more than standard 2205 due to elevated chromium, molybdenum, and nickel content.

• Size and profile: Larger cross-sections use more material per metre, which increases the overall weight and cost. Hex and flat bars may also have slightly different pricing compared to round bars of similar size due to differences in shape and processing.

• Manufacturing finish: Cold-drawn and ground bars are more costly than hot-rolled options due to tighter tolerances and additional processing steps.

• Order volume and market conditions: Base rates are tied to global nickel, chromium, and molybdenum commodity prices. Always confirm the current duplex steel bar price per kg before placing bulk orders.

Duplex Stainless Steel Bar Grades

Duplex stainless steel bar grades depend on the operating environment, corrosion resistance, temperature, and mechanical load. The 3 primary duplex stainless steel bar grades are listed below.

• Duplex Steel S31803 Bars
• Duplex Steel S32205 Bars
• Duplex Steel 2205 Bars

Types Of Duplex Steel Bars

Duplex steel bars are available in 5 primary profiles; each suits specific load types, fabrication methods, and engineering requirements.

• Round Bars
• Flat Bars
• Square Bars
• Hex Bars
• Hollow Bars

Duplex Steel Bars Specifications

The table below covers governing standards, dimensional ranges, microstructure, and mechanical properties for duplex steel bar procurement and engineering reference.

Duplex Steel Bars Size Chart

Duplex steel bar sizes cover a wide dimensional range across all standard profiles, with lengths typically from 3,000 mm to 6,000 mm and custom forged lengths available on request.

Key Features Of Duplex Steel Bars

Duplex steel bars are specified for 8 performance characteristics that standard austenitic stainless grades cannot match under combined mechanical and corrosive conditions.

• Superior Strength-to-Weight Ratio
• Enhanced Corrosion Resistance
• Versatility
• Weldability and Fabrication
• High Strength and Toughness
• Resistance to Stress Corrosion Cracking (SCC)
• Cost-Effectiveness
• High Fatigue Resistance

Applications Of Duplex Steel Bars

Duplex steel bars are used in 8 key sectors where carbon steel or austenitic grades fail to perform effectively due to corrosion, high loads, or harsh working conditions.

• Oil and Gas Industry
• Chemical Processing
• Marine Applications
• Construction
• Pulp and Paper Industry
• Pharmaceuticals
• Nuclear Power Plants
• Food Processing

How To Choose The Right Duplex Steel Bars Supplier And Manufacturer?

Choosing the right duplex steel bar supplier affects quality, delivery time, and overall cost. Follow these criteria before finalising a vendor.

Selecting The Right Supplier And Manufacturer:

Confirm the manufacturer supplies duplex steel bars in the exact grade, profile, and size range required. Not every facility stocks all duplex variants or handles custom bar lengths. Verify production capabilities and available stock before issuing an RFQ.

Technical Considerations:

Match the grade to the service environment, 2205 or S31803 for general chemical and marine media, and S32750 or S32760 for severe chloride or high-temperature applications. Request a Material Test Certificate (MTC) confirming chemical composition and mechanical properties. Confirm compliance with ASTM A276 or ASTM A479 as applicable. Custom sizes typically carry 6–10 week lead times; check stock availability early.

Evaluating Supplier Credibility:

A credible duplex steel bar supplier holds ISO 9001 certification at a minimum. Each bar batch must carry a heat number traceable to the originating mill. This is essential for project documentation, quality audits, and traceability requirements in regulated industries.

Procurement Strategy:

Send a clear RFQ that specifies the grade (UNS number), profile type, size, finish, standard, and order quantity. At least compare three supplier proposals based on pricing, lead time, MTC availability, and minimum order quantities. For bulk orders, schedule a pre-dispatch inspection (PDI) or third-party inspection (TPI) at the facility.