Sheet, Pipe, Bar & Tube | ASTM A240 / A790 / A479
High-performance duplex stainless steel with exceptional corrosion resistance and mechanical strength. Global supply from Europe, China, and Dubai.
Updated: July 2025
Product Form Minimum Order
**Trial orders available for approved buyers. Subject to extended lead time or surcharge.
Includes Free Pre-Shipment Third-Party Inspection (PMI, Dimensional, Visual, Photos) by SGS / TÜV
We don’t just sell certified material. We re-certify it ourselves and then have an independent expert verify it. This is our definition of uncompromising integrity.
Forms: Sheet / Plate / Welded Pipe / Seamless Pipe / Round Bar / Tube
Standards: ASTM A240, A790, A479
UNS: S32205 / S31803
W.Nr.: 1.4462
Super Duplex 2507 has higher chromium, molybdenum, and nitrogen content compared to Duplex 2205, giving it superior corrosion resistance, especially against pitting and crevice corrosion in seawater. It also offers greater tensile and yield strength, making it ideal for offshore and high-pressure environments.
Yes, 2507 offers far superior resistance to chloride-induced corrosion compared to 316L or even 904L. It’s often used as an upgrade in chemical, desalination, and marine systems where traditional austenitic grades fail under stress or corrosion.
Use ER2594 or E2594 welding wire/electrode. Heat input and interpass temperature must be carefully controlled to preserve the desired ferrite-austenite phase balance and prevent cracking.
Yes, when certified to NACE MR0175 / ISO 15156, Super Duplex 2507 is fully suitable for use in sour gas environments. Be sure to specify this requirement in your inquiry to receive compliant material.
• Plates and welded pipes are commonly available from stock in China and Dubai.
• Seamless pipes are usually made-to-order and may have longer lead times.
• Typical delivery times range from 1–3 weeks for stock items, and 4–6 weeks for custom seamless pipes.
• EN 10204 3.1 MTC – 3.2 on request
• Third-party inspection (e.g., TUV, SGS)
• NACE MR0175 compliance for sour service
**Traceable by heat & batch numbers for EPC & offshore projects
Duplex 2205 – Twice the Strength, Half the Trouble
The go-to alloy for stress-prone environments and aggressive corrosion.
Tougher than 316L, stronger than standard austenitics.
Duplex 2205 is a nitrogen-enhanced duplex stainless steel alloy combining high strength and excellent corrosion resistance, especially in chloride environments. It has a two-phase microstructure (austenite-ferrite) and is widely used in aggressive service conditions such as offshore platforms, chemical processing, and desalination. ASTM standards vary based on the product form. Below is a comprehensive summary of relevant specifications.
• Product Form: Plate, Sheet, Strip
• Application: Pressure vessels, structural parts, chemical equipment
• Key Notes:
o Covers duplex and austenitic stainless steels including UNS S31803 / S32205
o Typically supplied in solution annealed and pickled condition
o Thickness range: from thin gauge (~0.3 mm) to heavy plates (>50 mm)
o Surface finish options: hot rolled, cold rolled, pickled, or polished
o Includes tensile, elongation, and bend tests per ASTM A240 requirements
o Duplex alloys must meet ferrite/austenite phase balance requirements
• Product Form: Seamless and Welded Pipe
• Application: Oil & gas, seawater piping, structural systems
• Key Notes:
o Includes UNS S31803 and S32205
o Applies to pipe used in corrosive or pressure-rated environments
o Mandatory NDT: Each pipe must undergo ultrasonic or eddy current testing
o Dimensional, straightness, and ovality tolerances defined
o Typical mechanical properties:
▪ Yield Strength ≥ 450 MPa
▪ Tensile Strength ≥ 620 MPa
▪ Elongation ≥ 25%
o Hydrostatic testing required for welded pipes
o Weld integrity must be demonstrated through RT or UT
• Product Form: Round Bar, Hex Bar, Square Bar, Forged Shapes
• Application: Machined components, flanges, fasteners, shafts
• Key Notes:
o Covers hot- or cold-finished stainless bars including duplex grades
o Includes mechanical property testing and heat treatment conditions
o Surface finish: peeled, ground, polished, or rough turned
o Suitable for pressure-retaining applications
o Duplex 2205 bars must meet specific microstructure (ferrite/austenite) targets
• Product Form: Tube (Seamless / Welded)
• Application: Heat exchangers, condensers, seawater coolers
• Key Notes:
o Covers duplex tube for non-pressure and moderate-pressure service
o Mandatory eddy current or ultrasonic inspection
o Chemical and mechanical properties identical to A790 pipe
o Often used for thin-wall and coiled tubing applications
o Leak testing required (hydrostatic or pneumatic)
o Must maintain corrosion and mechanical performance even in welded form
• Product Form: Flanges, Fittings, Forged Components
• Application: High-stress or pressure piping systems
• Key Notes:
o Applicable to forged duplex steel parts including S31803/S32205
o Requires solution annealing and full mechanical testing
o Often used in petrochemical and power generation environments
o Third-party verification required for some critical projects (e.g., NORSOK, PED)
