AK-EM4 Submerged Arc Welding Wire for High-Strength Low-Alloy Steel.
A low alloy high strength steel submerged arc welding wire designed for structural applications requiring excellent mechanical properties and toughness at low temperatures.
Product Overview
AK-EM4 is a low alloy high strength steel submerged arc welding wire formulated for use with matching fluxes such as SJ618. When combined with the appropriate flux, it produces weld metal with high tensile strength, good ductility, and impact resistance suitable for demanding structural applications.
The wire is classified under EN ISO 26304 B:S 76A4 FB SUN5M3, AWS A5.23 F11A4-EM4-M4, and GB/T 12470 F76A4 -H08Mn2NiMoA, ensuring compatibility with international standards for high-strength structural welding.
Application: With flux (such as SJ618, etc.), it is used for the welding of low-alloy and high-strength structural meshes such as lifting and transportation machinery and construction machinery, such as Q690.
Key Benefits
High Tensile Strength and Yield Stress.
The deposited metal achieves a tensile strength of 760-900 MPa and a yield stress of at least 680 MPa, making it suitable for high-strength structural components such as those in lifting and transportation machinery.
Excellent Low-Temperature Toughness
Impact values of at least 27 J at minus 40 degrees C ensure reliable performance in cold environments, reducing the risk of brittle fracture in critical joints.
Controlled Chemical Composition
Precise levels of carbon (≤0.10%), manganese (1.40-1.80%), chromium (0.60%), and molybdenum (0.50-0.65%) contribute to balanced mechanical properties and weldability.
Low Sulfur and Phosphorus Content.
Sulfur content is limited to ≤0.010% and phosphorus to ≤0.015%, minimizing the risk of hot cracking and improving weld metal cleanliness.
Where It Is Used
- Welding of low-alloy and high-strength structural components such as Q690 steel.
- Construction and transportation machinery requiring high-strength, tough welds.
- Structural mesh and heavy-duty frames in industrial equipment.
- Submerged arc welding in automated or semi-automated production lines.
Who It Is For
- Welding consumable distributors supplying high-strength structural welding solutions.
- Fabricators of heavy machinery and lifting equipment.
- Contractors working on high-strength steel structures in demanding environments.
Problems It Solves
- Achieving required mechanical properties in high-strength structural welds without compromising toughness or ductility.
- Matching filler metal chemistry to base metals like Q690 to meet code requirements for strength and impact performance.
- Reducing the risk of weld defects due to high sulfur or phosphorus content in the deposited metal.
Specifications
Published by the factory for AK-EM4. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO 26304 B:S 76A4 FB SUN5M3 |
| Classification 2 | AWS A5.23 F11A4-EM4-M4 |
| Classification 3 | GB/T 12470 F76A4 -H08Mn2NiMoA |
| Element | Content |
|---|---|
| C | ≤0.10 |
| Si | 0.20-0.60 |
| Mn | 1.40-1.80 |
| S | ≤0.010 |
| P | ≤0.015 |
| Cr | 0.60 |
| Mo | 0.50-0.65 |
| Property | Value |
|---|---|
| Tensile strength (MPa) | 760-900 |
| Yield Stress (MPa) | ≥680 |
| Elongation (%) | ≥15 |
| Impact values (J) | ≥27J/-40℃ |
Technical Features
- Low alloy high strength steel submerged arc welding wire with specified chemical composition.
- Deposited metal tensile strength of 760-900 MPa and yield stress of at least 680 MPa.
- Elongation of at least 15 percent and impact energy of at least 27 J at minus 40 degrees C.
- Complies with EN ISO 26304 B:S 76A4 FB SUN5M3, AWS A5.23 F11A4-EM4-M4, and GB/T 12470 F76A4 -H08Mn2NiMoA standards.
- Designed for use with fluxes such as SJ618.
Use Guide
- Select the appropriate flux (e.g., SJ618) to match the wire and ensure optimal weld metal properties.
- Maintain proper welding parameters as recommended for submerged arc welding processes to achieve consistent bead quality and mechanical performance.
- Ensure base metal surfaces are clean and free from oil, rust, moisture, and contaminants before welding.
- Store the wire in a dry environment to prevent moisture absorption, which may affect weld quality.
How It Compares
AK-EM4 is a high-strength low-alloy submerged arc welding wire suitable for structural applications requiring high tensile strength and toughness. It differs from standard mild steel wires by its elevated manganese, chromium, and molybdenum content, which enhances strength and hardenability. It is not intended for use on low-strength steels where lower alloy content would be sufficient. When compared to other high-strength wires, AK-EM4 offers a balanced combination of strength, ductility, and low-temperature impact performance as defined by its classification standards.
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Technical background on this grade from the AKWELD knowledge centre.
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Other welding wire in the same family.
AK-EM4 Questions
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