AK-EF1 Submerged Arc Welding Wire for 620MPa High-Strength Steel.
A submerged arc welding wire formulated for high-strength steel with 1.3% Ni—0.3% Mo, delivering stable arc, easy slag removal, and excellent mechanical properties in critical pressure applications.
Product Overview
AK-EF1 is a submerged arc welding wire designed for high-strength steel with a minimum tensile strength of 620 MPa. The wire contains 1.3% Ni and 0.3% Mo as primary alloying elements, contributing to the weld metal's strength and toughness.
The wire produces a stable arc during welding, easy slag removal, and a smooth, attractive weld bead. Mechanical properties of the deposited metal meet or exceed 550–700 MPa tensile strength, 470 MPa yield stress, 20% elongation, and 54 J impact energy at 0 degrees C.
AK-EF1 is supplied to EN ISO 26034-A:S 55 4 FB(S 3NiMo) and AWS A5.23 F9A/P4-EF1 classifications, and also complies with GB/T 36034 S 62A / P 4 FB-SUM2M2. It is used in the fabrication of large power stations, boilers, high-pressure vessels, and steam pipes.
Application: For welding of large power stations, boilers, high pressure vessels, steam pipes, etc.
Key Benefits
Stable Arc and Easy Slag Removal.
The wire delivers consistent arc performance during welding, with slag that detaches easily, reducing cleaning time and improving productivity.
High Mechanical Strength and Toughness.
The deposited metal achieves tensile strength between 550 and 700 MPa, yield stress of at least 470 MPa, elongation of at least 20%, and impact energy of at least 54 J at 0 degrees C.
Excellent X-Ray Qualification Rate.
The weld metal exhibits high integrity, resulting in a high X-ray inspection pass rate, which is critical for pressure-containing components.
Suitable for High-Strength Steel Applications.
The wire is specifically formulated for 620 MPa high-strength steel, making it ideal for demanding environments in power generation and pressure vessel construction.
Where It Is Used
- Welding of large power station components.
- Boiler fabrication and repair.
- High-pressure vessel construction
- Steam pipe welding in industrial plants.
Who It Is For
- Pressure vessel and boiler manufacturers requiring high-strength, code-compliant welding wire.
- Fabricators of large-scale industrial equipment in power and petrochemical sectors.
- Welding engineers specifying consumables for high-integrity, high-strength joints.
Problems It Solves
- Matching filler metal chemistry to high-strength steel with 1.3% Ni—0.3% Mo to achieve required mechanical properties and code compliance.
- Achieving consistent weld quality with high X-ray qualification rates in critical pressure components.
- Reducing post-weld cleaning time through easy slag removal and stable arc performance.
Specifications
Published by the factory for AK-EF1. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO 26034-A:S 55 4 FB(S 3NiMo) AWS A5.23 F9A/P4-EF1 |
| Classification 2 | GB/T 36034 S 62A / P 4 FB-SUM2M2 |
| Element | Content |
|---|---|
| C | 0.07-0.15 |
| Si | 0.15-0.35 |
| Mn | 0.90-1.70 |
| S | ≤0.015 |
| P | ≤0.020 |
| Ni | 0.95-1.70 |
| Mo | 0.25-0.55 |
| Property | Value |
|---|---|
| Tensile strength (MPa) | 550-700 |
| Yield Stress (MPa) | ≥470 |
| Elongation (%) | ≥20J |
| Impact values (J) | ≥54J/0℃ |
Technical Features
- Submerged arc welding wire for high-strength steel with 1.3% Ni and 0.3% Mo content.
- Deposited metal tensile strength: 550–700 MPa.
- Yield stress: at least 470 MPa.
- Elongation: at least 20%
- Impact energy: at least 54 J at 0 degrees C.
- Complies with EN ISO 26034-A:S 55 4 FB(S 3NiMo), AWS A5.23 F9A/P4-EF1, and GB/T 36034 S 62A / P 4 FB-SUM2M2.
- Chemical composition: C 0.07–0.15%, Si 0.15–0.35%, Mn 0.90–1.70%, S ≤0.015%, P ≤0.020%, Ni 0.95–1.70%, Mo 0.25–0.55%
Use Guide
- Select welding parameters based on joint design, plate thickness, and position. Use recommended current and voltage ranges to maintain stable arc and proper bead formation.
- Ensure the base metal and joint surfaces are clean and free from oil, rust, moisture, and paint before welding.
- Store the wire in a dry environment to prevent moisture absorption. Re-bake if exposed to humid conditions before use.
- Use flux compatible with AK-EF1 to ensure proper slag coverage and weld metal quality.
How It Compares
AK-EF1 is a high-strength submerged arc wire with 1.3% Ni and 0.3% Mo, designed for applications requiring 620 MPa tensile strength and high toughness. It differs from standard low-alloy wires by offering enhanced strength and impact performance at 0 degrees C. Compared to lower-strength alternatives, it provides better mechanical properties in high-pressure and high-temperature environments. It is not intended for use on mild steel or low-strength materials where lower alloy content would be sufficient.
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Other welding wire in the same family.
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