AK-EA4 Submerged Arc Welding Wire for Low-Alloy High-Strength Steel.
A low alloy high-strength submerged arc welding wire designed to deliver specified mechanical properties when used with matching fluxes for structural steels like Q490.
Product Overview
AK-EA4 is a submerged arc welding wire for low-alloy high-strength structural steels. It is formulated to achieve target mechanical properties when combined with compatible fluxes such as AKJ101 or AKJ105.
The wire's chemical composition includes 0.15% carbon, 0.80% silicon, 1.60% manganese, 0.40–0.65% molybdenum, and controlled levels of sulfur and phosphorus at or below 0.030% each, supporting strength and toughness in the weld metal.
Application: With flux (such as AKJ101, AKJ105, etc.) for the welding of low-alloy high-strength structural steel such as Q490.
Key Benefits
High Tensile Strength and Yield Stress.
The wire delivers a tensile strength of 550–700 MPa and a yield stress of at least 470 MPa, meeting the requirements for high-strength structural applications.
Good Ductility and Toughness.
With elongation of at least 20% and impact values of at least 27 J at minus 30 degrees C, the deposited metal maintains performance in low-temperature service.
Compatibility with Matching Fluxes.
When used with fluxes such as AKJ101 or AKJ105, AK-EA4 ensures consistent mechanical properties and weld quality in production environments.
Controlled Chemistry for Clean Weld Metal.
Low sulfur and phosphorus content (≤0.030%) help reduce the risk of cracking and improve weld metal cleanliness, especially in critical structural joints.
Where It Is Used
- Welding of low-alloy high-strength structural steels such as Q490.
- Heavy fabrication and structural components requiring high strength and toughness.
- Submerged arc welding in automated or semi-automated production lines.
Who It Is For
- Structural steel fabricators working with high-strength steels.
- Welding distributors supplying consumables for structural and heavy equipment projects.
- EPC contractors and fabricators requiring consistent, code-compliant weld metal properties.
Problems It Solves
- Achieving specified mechanical properties in weld metal when joining high-strength low-alloy steels like Q490.
- Matching wire and flux combinations to ensure consistent performance across production batches.
- Reducing the risk of weld defects due to impurities in the deposited metal by using low-sulfur and low-phosphorus wire.
Specifications
Published by the factory for AK-EA4. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO 24598-A:S S(MnMo) AWS A5.23 F8A/P0-EA4-A4 |
| Classification 2 | GB/T —— |
| Element | Content |
|---|---|
| C | 0.15 |
| Si | 0.80 |
| Mn | 1.60 |
| S | ≤0.030 |
| P | ≤0.030 |
| Mo | 0.40-0.65 |
| Property | Value |
|---|---|
| Tensile strength (MPa) | 550-700 |
| Yield Stress (MPa) | ≥470 |
| Elongation (%) | ≥20 |
| Impact values (J) | ≥27J/-30℃ |
Technical Features
- Chemical composition: C 0.15%, Si 0.80%, Mn 1.60%, Mo 0.40–0.65%, S ≤0.030%, P ≤0.030%
- Tensile strength: 550–700 MPa.
- Yield stress: ≥470 MPa.
- Elongation: ≥20%
- Impact toughness: ≥27 J at minus 30 degrees C.
- Complies with EN ISO 24598-A:S S(MnMo) and AWS A5.23 F8A/P0-EA4-A4 standards.
- Designed for use with fluxes such as AKJ101 and AKJ105.
Use Guide
- Select a matching flux such as AKJ101 or AKJ105 to ensure the desired mechanical properties are achieved in the weld metal.
- Ensure the wire and flux are stored dry and protected from moisture before use.
- Follow recommended welding parameters for the specific application and joint configuration.
- Clean joint surfaces of rust, oil, paint, and moisture prior to welding to avoid porosity and cracking.
How It Compares
AK-EA4 is a low alloy high-strength submerged arc wire intended for structural steels like Q490. It differs from general-purpose mild steel wires by its higher strength and controlled alloying elements. When compared to other high-strength wires, its molybdenum content (0.40–0.65%) supports improved hardenability and toughness. It is not intended for use with fluxes outside the recommended range, as this may compromise mechanical properties.
Related Articles
Technical background on this grade from the AKWELD knowledge centre.
Related Grades
Other welding wire in the same family.
AK-EA4 Questions
What standards does AK-EA4 meet?
Which fluxes are recommended for use with AK-EA4?
What are the mechanical properties of the deposited metal?
What is the carbon content and how does it affect weldability?
What packing is AK-EA4 supplied in?
Can we test AK-EA4 before placing a production order?
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