Duplex 2205 Stainless Plate

1. Standard: ASTM A790 / ASME SA790、ASTM A928 / ASME SA928
2. Size: 5.0 - 1219.2 mm
3. Thickness : 0.5 - 20mm
4. Length: Single, Double Random & Cut Length

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Product Introduction

Duplex 2205 stainless plate, the term "duplex" refers to the dual-phase microstructure of the metal. While standard 300-series stainless steels are purely austenitic and 400-series steels are ferritic, a premium duplex 2205 plate balances these two phases in an approximate 50:50 ratio. HT PIPE is a astm a240 type 2205 plate supplier with 15+ export experience. Contact us for more information and quotes for free!

Product Forms

Bar & Rod

Plate & Sheet

Coil & Strip

Pipe & Tube

Fitting: Flange, Tee, Elbow, Reducer etc.

Forging: Ring, Shaft, Circle, Block etc.

ASME SA 240 UNS S32205 Sheet Specifications

Specification	ASTM A240 / ASME SA240
Standard Sizes	1000 x 2000 mm, 1220 x 2440 mm, 1500 x 3000 mm, 2000 x 2000 mm, 2000 x 4000 mm
Thickness	0.5mm to 50mm
Width	1000mm to 2500mm
Length	2m, 2.44m, 3m, or as required
Finish	2B, No.4, BA, 8K, satin, hairline, brush, mirror, etc.
Form	Plate, Sheet, Coils, Foils, Strip, Flats, Clad Plate, Plain Sheet, Rolling Sheet, Rolling Plate
Fabrication	Hot rolled, Cold rolled
Plasma profiles	As per the customer's drawings
Value added services	Waterjet Cutting, Laser Cutting, Plasma Cutting, Bending and Mechanical Processing, Edge Preparation, Welding, Sawing, and Shearing.

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2205 Stainless Steel Pipe Chemical Properties

	C	Si	Mn	P	S	Cr	Ni	Mo	Cu	N	PREN	Fe
Min	•	•	•	•	•	24	4.5	2.9	1.5	0.1	40	0
Max	0.04	1	1.5	0.04	0.03	27	6.5	3.9	2.5	0.25	•	0

Yield Strength Optimization and Material Weight Reduction

One of the primary economic justifications for purchasing a 2205 stainless steel plate rather than a 316L alternative is its mechanical capability.

The yield strength of a standard duplex 2205 plate is approximately twice that of conventional austenitic grades.

Engineering Impact: This structural capacity allows design engineers to significantly reduce material wall thicknesses in pressure vessels, storage tanks, and structural supports without sacrificing safety margins. Thinner plates translate directly to lower overall structural weight, reduced freight costs, and less filler metal required during the welding phase.

Resistance to Chloride Stress Corrosion Cracking (SCC)

Austenitic stainless steels are notoriously prone to sudden, catastrophic SCC when exposed to tensile stress in warm, chloride-rich environments (such as marine coastlines or industrial cooling systems).

The ferritic phase inherently embedded within 2205 duplex plate acts as a structural barrier to transgranular crack propagation, allowing the alloy to perform safely in environment temperatures up to approximately 300℃ (572℉) before long-term thermal embrittlement becomes a risk.

Forming and Bending

Because of the alloy's inherent stiffness, fabricators must budget for significantly higher power requirements when utilizing press brakes or plate rollers. The material exhibits a higher level of elastic spring-back compared to standard carbon or austenitic steels. A minimum bend radius of 2T (twice the plate thickness) is generally recommended to prevent surface micro-cracking during cold-forming operations.

Welding Protocols

2205 duplex plate features excellent weldability, provided the thermal input is tightly managed. The goal during welding is to maintain the balanced 50:50 ferrite-austenite ratio within the Heat Affected Zone (HAZ).

Filler Metals: Over-alloyed filler metals containing elevated nickel content (such as ER2209 or E2209) are typically specified to ensure the weld pool solidifies with sufficient austenite phase distribution.
Thermal Control: Preheating is generally discouraged, and interpass temperatures must be carefully monitored to avoid the precipitation of brittle intermetallic phases (such as the sigma phase), which dramatically degrade both impact toughness and corrosion resistance.