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Home Stainless Steel Profiles 2205 Duplex Steel I – Beam

2205 Duplex Steel I – Beam

160×88×6mm, offshore platform, high strength

2205 Duplex Steel I-Beam (standard GB/T 706-2016, 022Cr23Ni5Mo3N) consists of 50% austenite + 50% ferrite, with a yield strength ≥450 MPa (twice that of 304 stainless steel) and a PREN value ≥40.

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  • High Strength & Lightweight

    Yield strength is twice that of standard 304, enabling a wall thickness reduction of up to 30% and decreasing overall offshore structural weight by 40%, significantly lowering freight and installation costs.

  • Chloride Stress Corrosion Resistance

    Zero risk of stress corrosion cracking in high-chloride seawater and aggressive chemical media; PREN ≥40 ensures superior localized pitting resistance compared to 316L.

  • Fatigue Resistance

    High fatigue strength at $10^7$ cycles ≥300 MPa, engineered specifically to withstand continuous wave impact on offshore platforms and vibrating chemical equipment.

Product Specifications

Chemical Composition Table (GB/T 21832-2008)
Element C ≤ Si ≤ Mn ≤ P ≤ S ≤ Cr Ni Mo N
Content % 0.03 1 2 0.035 0.03 22.0–23.0 4.5–6.5 3.0–3.5 0.08–0.20
Physical & Chemical Properties

  • Physical Properties: Density 7.8 g/cm³, melting point 1300–1390 °C, thermal conductivity 25 W/(m·K) (20 °C).

  • Mechanical Properties (Annealed): Tensile strength ≥620 MPa, yield strength ≥450 MPa, elongation ≥25%, hardness ≤290 HB.

  • Chemical Properties: No pitting in 3.5% NaCl solution; 50% higher resistance to crevice corrosion than 316L.

Specifications & Supply Dimensions

Reference cross-section sizes (GB/T 706-2016):

Model (h×b×d) Height h (mm) Flange Width b (mm) Web Thickness d (mm) Theoretical Weight (kg/m)
I16# 160 88 6 20.513
I25a# 250 116 8 38.105
I40a# 400 142 10.5 67.598

  • Length: Custom 6–12 m, standard tolerance ±5 mm, minimum order 200 kg.

  • Surface: Hot-rolled pickled, passivated (enhanced corrosion resistance).

Pricing Calculation

Workshop & Manufacturing Machine

Stainless Steel Profiles on Storage Racks

Spectrometer for Alloy Composition Analysis

Profile Weighing with Crane Scale

Factory Stacking of Stainless Steel Profiles

Packaged Stainless Steel Profiles for Shipment

Worker Loading Profiles onto Truck

Product Applications

  • Chemical High-Pressure Support Beams

    Stainless steel I-beams used as structural supports for petroleum cracking units commonly installed in chemical production workshops, providing reliable resistance to high-pressure environments up to 10 MPa and corrosion from H₂S-containing gases.

  • Offshore Drilling & Wind Platforms

    Stainless steel I-beams applied as deck support structures for drilling platforms commonly built in shipbuilding yards, offering strong resistance to seawater corrosion and wave impact with service life exceeding 15 years.

FAQs

What are the advantages of 2205 duplex steel I beams?
They offer double the yield strength of 304/316L, exceptional resistance to chloride stress corrosion (PREN ≥40), and allow structural weight reduction of up to 40% in heavy load-bearing projects.
Is welding duplex steel I beams difficult?
No. With proper heat input control and matching consumables (e.g., E2209 electrodes), 2205 beams maintain excellent weldability while preserving their dual-phase microstructure.
Do you provide certification for duplex I beams?
Yes. Every batch is delivered with original Mill Test Certificates (MTC) and fully supports pre-shipment inspections by independent agencies like SGS, BV, and TUV.
What are the advantages of 2205 duplex steel I beams?
Duplex 2205 offers high strength, excellent corrosion resistance, and good fatigue performance.
What applications typically use duplex steel I beams?
Offshore platforms, bridges, marine structures, and chemical plant frameworks.

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Walmay will help match the right stainless product form and specification for your application, confirm quantities and packing needs, and provide requested documents based on order requirements.

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