ER2209 is a duplex stainless steel welding consumable widely used in the petrochemical industry, offshore platforms, shipbuilding, and other fields.

一. Product Types and Standards:

① ER2209 includes welding wires (such as TIG and MIG welding wires) and welding rods (such as E2209-16).

② Complies with multiple standards:
Chinese Standard: YB/T 5092 H03Cr22Ni8Mo3N
US Standard: AWS A5.9 ER2209 (welding wire), AWS A5.4 E2209 (welding rod)
International Standard: ISO 14343-A-G 22 9 3 N L

二. Chemical Composition:

The typical chemical composition (%) of ER2209 is as follows:

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三. Mechanical Properties:

Typical mechanical properties of the deposited metal are as follows:

Tensile Strength: ≥770 MPa (typical values up to 800-810 MPa)
Yield Strength: ≥450 MPa (typical values up to 550 MPa)
Elongation: ≥20% (typical values up to 30-33%)
Ferrite Content: Approximately 50% (WRC-92 standard)

四. Main Applications:

ER2209 is specifically designed for welding 22%Cr duplex stainless steel (such as 2205/S31803/S32205). Common applications include:

Offshore platforms: Piping systems, flowlines, and risers.
Petrochemical equipment: Containers, pipelines, and pressure vessels.
Shipbuilding: Hull structures and corrosion-resistant components.
Hydraulic engineering: Corrosion-resistant structural components.

五. Welding Characteristics:

①Corrosion Resistance: Excellent resistance to stress corrosion cracking (especially in chloride environments) and pitting corrosion.

②Processing Performance: Suitable for TIG, MIG, and metal arc welding; produces stable arcs, minimal spatter, and aesthetically pleasing finishes.
③Welding Position: Suitable for all positions (including horizontal, horizontal, vertical, and overhead).

六. Welding Precautions:

①Pretreatment:
Before welding, remove oil, rust, and moisture from the weld surface to prevent pores and cracks.
The welding rod must be baked at 250°C for 1.5 hours (use immediately upon baking).
② Shielding Gas:
TIG welding: Pure argon (purity ≥99.99%), flow rate 8-15 L/min.
MIG welding: Recommended mixture of Ar and 2% O₂, flow rate 20-25 L/min.
③ Welding Parameters:
Strictly control the heat input (affects the mechanical properties and crack resistance of the weld).
It is recommended to use reverse direct current (DC+) or alternating current (AC); avoid wind speeds >1.0 m/s.
④ Post-weld Treatment: Perform a process assessment if necessary to ensure performance.

七. Product Specifications and Availability:

① Common Specifications:
Wire diameter: 0.8-4.0 mm (common 1.2 mm, 1.6 mm, 2.4 mm, and 3.2 mm).
Rod diameter: 2.5 mm, 3.2 mm, 4.0 mm, and 5.0 mm.

② Packaging: Welding wire is available in coils or strips.

八. Advantages and Features:

① Duplex Structure: The weld metal features an austenite-ferrite duplex structure (approximately 50:50), balancing high strength with good toughness.

② Cost-Effective: Suitable for harsh environments (such as seawater and high-chloride media), it can replace high-alloy materials and reduce costs.

九. Summary:

ER2209, as a high-performance duplex stainless steel welding consumable, can achieve welds with excellent strength, ductility, and corrosion resistance through proper welding process control. It is ideal for welding and repairing critical equipment in the energy, chemical, and offshore engineering sectors.