Product Category

Duplex 2205 Stainless Steel Equal Angles

Tags : 310S furnace tube , NAS 800 Nickel Alloy Tubes , ASME SA213 TP310S

High-Performance Duplex Angles for Offshore Platforms, Marine Fabrication, and High-Chloride Environments

Premium Duplex 2205 (S31803/S32205) Stainless Steel Equal Angles for Structural Supports, Shipbuilding, Seawater Systems, and Chemical Plant Frameworks

Womic Steel manufactures premium Duplex 2205 Stainless Steel Equal Angles, covering a complete range of sizes from 20x20mm to 200x200mm. Our S31803/S32205 duplex angles deliver approximately twice the yield strength of 316L (≥450 MPa), excellent resistance to chloride stress corrosion cracking, outstanding pitting resistance, and exceptional structural integrity in aggressive marine and chemical environments.

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Key Features of Duplex 2205 Stainless Steel Equal Angles

High Strength (≥450 MPa Yield): Twice the yield strength of 304/316L, allowing lighter sections and reduced weight.

Superior Chloride SCC Resistance: Performs reliably where 304L and 316L fail in high-chloride environments.

Excellent Pitting Resistance: PRE ≥ 34 (S31803) / ≥ 35 (S32205) for seawater and aggressive media service.

Balanced Dual-Phase Microstructure: 50% ferrite / 50% austenite for optimal strength and corrosion balance.

Good Weldability: Maintains phase balance with proper procedures and ER2209 filler metal.

Low Thermal Expansion: 13.5 μm/m·K vs 15.9-17.2 for austenitic grades, reducing thermal stress.

International Certifications: ABS, BV, DNV, LR, GL, RINA, CCS, KR, NK, NORSOK M-630.

International Standards and Corresponding Grades

Standard	Description	Duplex 2205 Grade
ASTM A276 / A479	Stainless steel bars and shapes	S31803 / S32205
EN 10088-2 / EN 10088-4	European structural sections	1.4462 (X2CrNiMoN22-5-3)
JIS G4303	Japanese bars and shapes	SUS329J3L
GB/T 4226	Chinese cold-formed sections	022Cr22Ni5Mo3N
NORSOK M-630	Offshore material standard	S31803 / S32205

Chemical Composition

Element	C	Mn	P	S	Si	Cr	Ni	Mo	N
S31803	≤0.030	≤2.00	≤0.030	≤0.020	≤1.00	21.0–23.0	4.5–6.5	2.5–3.5	0.08–0.20
S32205	≤0.030	≤2.00	≤0.030	≤0.020	≤1.00	22.0–23.0	4.5–6.5	3.0–3.5	0.14–0.20

S32205 offers tighter composition controls for enhanced corrosion resistance. PRE ≥35 vs ≤26 for 316L.

Mechanical Properties and Heat Treatment

Property	Unit	Duplex 2205
Tensile Strength	MPa	≥620
Yield Strength	MPa	≥450
Elongation	%	≥25
Hardness (Brinell)	HBW	≤290
Density	g/cm³	7.80
Thermal Expansion (20-100°C)	μm/m·K	13.5

Heat Treatment: Solution annealed at 1040–1120°C followed by water quenching (mandatory – air cooling causes sigma phase embrittlement).

Delivery Condition: Annealed and pickled (standard); grit blasted available for paint adhesion.

Standard Dimensions and Sizes

Leg Length	Thickness	Weight (kg/m)	Leg Length	Thickness	Weight (kg/m)
40 x 40 mm	4 mm	2.42	75 x 75 mm	6 mm	6.92
40 x 40 mm	5 mm	2.98	75 x 75 mm	8 mm	9.09
50 x 50 mm	5 mm	3.79	100 x 100 mm	8 mm	12.32
50 x 50 mm	6 mm	4.54	100 x 100 mm	10 mm	15.25
65 x 65 mm	6 mm	5.95	150 x 150 mm	12 mm	27.78
65 x 65 mm	8 mm	7.78	200 x 200 mm	15 mm	46.66

Custom sizes, unequal angles, and lengths up to 12m available.

Tolerances

Parameter	Size Range	Tolerance
Leg Length	≤50 mm	±0.8 mm
Leg Length	51-100 mm	±1.2 mm
Leg Length	101-200 mm	±1.6-2.0 mm
Thickness	≤5 mm	±0.3 mm
Thickness	>10 mm	±0.8 mm
Squareness	All sizes	±1.0°
Straightness	All sizes	2 mm/m

Manufacturing Process

Raw material selection (certified duplex billets)

Heating (1150–1200°C – lower than austenitic grades)

Hot rolling (strict temperature control)

Controlled cooling

Straightening

Solution annealing (1040–1120°C)

Water quenching (mandatory, <30 sec delay)

Pickling & passivation

Ferrite content measurement (35-65%)

Cutting, inspection, marking

Surface Conditions

Surface Type	Description	Applications
Annealed & Pickled	Oxide-free, matte finish – standard	Offshore platforms, marine structures
Grit Blasted	Uniform matte texture	Topside structures requiring paint
Passivated	Chemically enhanced passive layer	Critical marine/chemical service

Quality Control and Inspection

Chemical Analysis: PMI verification of Cr, Ni, Mo, N

Ferrite Measurement: 35-65% required (documented)

Microstructure Exam: No sigma or chi phases

Mechanical Testing: Tensile, yield, elongation, hardness

Charpy Impact: -40°C upon request

Dimensional Inspection: Leg length, thickness, squareness, straightness

Third-Party Inspection: SGS, BV, DNV, LR, TUV available

Applications

Offshore Oil & Gas Platforms: Topside structural supports, module frameworks, pipe racks, flare booms (ABS/BV/DNV/LR certified, NORSOK M-630 compliant)

Marine & Shipbuilding: Vessel structural framing, deck supports, bulkhead reinforcements, seawater intake structures

Desalination Plants: Brine line supports, evaporator structural frames, piping racks

Chemical Processing (Chloride Service): Equipment frameworks, pipe supports in high-chloride environments

Flue Gas Desulfurization (FGD): Scrubber supports, absorber platforms, ductwork supports

Port & Harbor Facilities: Crane rails, dock fendering, pier framing, loading platforms

Packaging and Delivery

Packaging: Steel-strapped bundles with woven fabric wrapping, plastic edge protection, wooden pallets for export. Moisture barrier for sea freight.

Womic Steel's Shipping Strengths:

Direct cooperation with global shipowners – competitive freight rates

Professional loading teams prevent bending and damage

Full documentation including NORSOK M-630, MTR, ferrite reports

Ready stock for common sizes

Continuous cargo tracking

Frequently Asked Questions (FAQ)

1. Why Duplex 2205 over 316L for marine angles?
Twice the yield strength (450 vs 170 MPa) and superior chloride SCC resistance. 316L suffers pitting in seawater; Duplex 2205 performs reliably.

2. Can Duplex 2205 angles be welded?
Yes. Use low heat input, N₂ shielding gas, and ER2209 filler. No PWHT required.

3. What is the maximum service temperature?
250°C for chloride service; 300°C for non-chloride. Above 300°C – sigma phase embrittlement risk.

4. S31803 vs S32205 – what's the difference?
S32205 has tighter Cr, Mo, N controls, providing PRE ≥35 vs ≥34. S32205 preferred for new offshore construction.

5. Are NACE MR0175 certified angles available?
Yes, for sour service applications. Full documentation available upon request.

Why Choose Womic Steel for Duplex 2205 Angles?

High Strength: 2.2-2.6x stronger than austenitic grades – lighter sections possible

Marine & Offshore Certified: ABS, BV, DNV, LR, NORSOK M-650 qualifications

Ferrite Controlled: 35-65% documented per heat

Full Traceability: Heat number on each bundle

Complete Size Range: 40x40mm to 200x200mm in stock

Global Delivery: Exported to major offshore and marine projects worldwide

Contact Us

Tel / WhatsApp:

Victor: +86 15575100681

Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Appendix: Common Sizes & Related Keywords

Stock Examples (6m length – Annealed & Pickled – Offshore Grade):

Size	Thickness	Weight	Primary Application
50x50mm	5mm	3.79 kg/m	Handrails, light framing
65x65mm	6mm	5.95 kg/m	Equipment supports
75x75mm	8mm	9.09 kg/m	Module framing, pipe racks
100x100mm	10mm	15.25 kg/m	Platform beams
150x150mm	12mm	27.78 kg/m	Offshore skids
200x200mm	15mm	46.66 kg/m	Heavy offshore structures

Related Keywords:

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