AK-ER312 Duplex Stainless Steel Welding Wire for High-Crack-Resistance Applications.
A 29% Cr-9% Ni austenitic-ferritic duplex stainless steel wire designed to maintain its duplex structure under high dilution and deliver excellent crack resistance in all welding positions.
Product Overview
AK-ER312 is a solid welding wire classified to EN ISO 14343-A:G 25 9, AWS A5.9 ER312, and GB/T 29713 S312. It is formulated as a 29% Cr-9% Ni austenitic-ferritic duplex stainless steel to retain its duplex microstructure even when diluted by high levels of austenite-forming elements.
The wire is suitable for welding cast alloys of similar composition and can also be used to join carbon steel and stainless steel, particularly high nickel stainless steel. Its composition provides high resistance to cracking during welding.
Application: Commonly used for welding cast alloys of similar composition, but can also be used for carbon steel and stainless steel (especially high nickel stainless steel).
Key Benefits
Maintains Duplex Structure Under High Dilution.
The wire's chemical balance ensures the duplex structure remains stable even when diluted by significant amounts of austenite-forming elements, which reduces the risk of hot cracking in the weld metal.
High Crack Resistance
The 29% Cr-9% Ni composition delivers high resistance to solidification and hot cracking, making it suitable for demanding applications where weld integrity is critical.
All-Position Welding Capability
AK-ER312 can be welded in all positions, allowing for flexible application on complex joints without requiring changes in consumable or technique.
Consistent Mechanical Properties
The deposited metal achieves a tensile strength of at least 680 MPa and elongation of at least 30%, supporting structural integrity in service.
Where It Is Used
- Welding of cast duplex stainless steel alloys with similar composition.
- Joining carbon steel and stainless steel, especially high nickel stainless steel.
- Fabrication and repair in environments requiring high corrosion and crack resistance.
Who It Is For
- Welding consumable distributors supplying duplex stainless steel solutions.
- Fabricators and maintenance teams working with duplex stainless steel in petrochemical and offshore applications.
- Contractors requiring a single wire for multiple base metals including high nickel stainless steel.
Problems It Solves
- Loss of duplex structure and reduced crack resistance when welding duplex steels with high dilution from base metals.
- Need to source multiple wires for different base metals when joining duplex steel to carbon steel or high nickel stainless steel.
- Weld cracking in high-dilution scenarios due to improper filler metal selection.
Specifications
Published by the factory for AK-ER312. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO 14343-A:G 25 9 |
| Classification 2 | AWS A5.9 ER312 |
| Classification 3 | GB/T 29713 S312 |
| Element | Content |
|---|---|
| C | 0.15 |
| Si | 0.30-0.65 |
| Mn | 1.0-2.5 |
| S | 0.03 |
| P | 0.03 |
| Ni | 8.0-10.5 |
| Cr | 28.0-32.0 |
| Mo | 0.75 |
| Cu | 0.75 |
| Property | Value |
|---|---|
| Tensile strength (MPa) | 680 |
| Elongation (%) | 30 |
Technical Features
- Solid welding wire with composition: 29% Cr, 9% Ni, 0.15% C, 0.30-0.65% Si, 1.0-2.5% Mn, 0.03% S, 0.03% P, 0.75% Mo, 0.75% Cu.
- Deposited metal tensile strength of at least 680 MPa and elongation of at least 30%
- Classified to EN ISO 14343-A:G 25 9, AWS A5.9 ER312, and GB/T 29713 S312.
- Suitable for all-position welding.
Use Guide
- Select welding parameters based on joint design, thickness, and position. Use recommended current and voltage ranges to maintain weld pool control and avoid excessive dilution.
- Clean base metal surfaces of oil, grease, rust, and scale before welding to prevent contamination and porosity.
- Store the wire in dry conditions and avoid exposure to moisture. Use within the recommended time after opening to prevent hydrogen pickup.
- Ensure proper shielding gas flow rate and type (typically argon-rich mixtures) to protect the weld pool from atmospheric contamination.
How It Compares
AK-ER312 is a duplex stainless steel wire with a 29% Cr-9% Ni composition, suitable for welding cast duplex alloys and joining carbon steel or high nickel stainless steel. It differs from standard austenitic wires like ER308L in its higher chromium and nickel content, which stabilizes the duplex structure under dilution. Unlike pure austenitic wires, AK-ER312 offers improved resistance to stress corrosion cracking and chloride-induced cracking in aggressive environments.
Related Grades
Other welding wire in the same family.
AK-ER312 Questions
What standards does AK-ER312 meet?
What are the key chemical elements and their ranges?
What mechanical properties does the deposited metal achieve?
Can this wire be used on carbon steel and high nickel stainless steel?
What packing is AK-ER312 supplied in?
Can we test AK-ER312 before placing a production order?
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