AK-ER70SD Gas Shielded Welding Wire for 700MPa High Toughness Low Alloy Steel.
A NiMo-type solid wire for gas shielded arc welding of high-strength low alloy steel structures, delivering stable arc, minimal spatter, and a smooth weld bead with excellent mechanical properties.
Product Overview
AK-ER70SD is a solid gas shielded welding wire classified under EN ISO, AWS A5.28 ER100S-G, and GB/T 8110 ER69-G. It is formulated for welding 700MPa grade high toughness low alloy steel structures with consistent performance across multiple applications.
The wire delivers arc stability, low spatter, and a clean, aesthetically pleasing weld bead. The deposited metal exhibits strong mechanical properties, including high tensile strength, yield stress, elongation, and impact toughness at low temperatures, meeting the demands of critical structural applications.
Application: AK-ER70SD is NiMo type 700MPa high toughness low alloy steel gas shielded welding wire, arc stability, small spatter, beautiful weld shape, deposited metal has good comprehensive mechanical properties. Suitable for welding 700MPA steel structure. Commonly used in construction machinery, lifting machinery, ships, bridges, hydropower, pipelines and pressure vessels and other structures of the welding.
Key Benefits
Stable Arc and Low Spatter.
The wire provides a stable arc during welding, reducing spatter and improving weld quality, especially in automated or semi-automated processes.
Smooth and Aesthetic Weld Bead.
The molten weld metal flows evenly, producing a clean, well-shaped bead that requires minimal post-weld grinding or finishing.
High Mechanical Properties in Deposited Metal.
The deposited metal achieves tensile strength of at least 690 MPa, yield stress of at least 610 MPa, elongation of at least 16 percent, and impact values of 130 J at minus 20 degrees C and 125 J at minus 40 degrees C.
Suitable for High-Strength Steel Structures.
Designed specifically for welding 700MPa grade low alloy steel, making it ideal for demanding structural applications in heavy machinery, ships, bridges, and pressure vessels.
Where It Is Used
- Construction and lifting machinery.
- Shipbuilding and offshore structures.
- Bridge and hydropower infrastructure.
- Pipeline and pressure vessel fabrication.
- High-strength steel structures requiring good toughness at low temperatures.
Who It Is For
- Welding consumable distributors supplying high-strength structural welding wires.
- Fabricators working with 700MPa grade low alloy steels in heavy equipment and infrastructure.
- Contractors in shipbuilding, bridge, and pipeline projects requiring consistent, certified filler metal.
Problems It Solves
- Achieving consistent weld metal properties in high-strength low alloy steel structures where mechanical performance must meet code requirements.
- Reducing spatter and weld bead imperfections in automated or high-speed welding processes.
- Ensuring good impact toughness at low temperatures in critical structural joints without compromising strength.
Specifications
Published by the factory for AK-ER70SD. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification | EN ISO —— AWS A5.28 ER100S-G GB/T 8110 ER69-G |
| Element | Content |
|---|---|
| C | 0.070 |
| Si | 0.46 |
| Mn | 1.50 |
| S | 0.004 |
| P | 0.012 |
| Ni | 1.34 |
| Cu | 0.13 |
| Mo | 0.45 |
| Al | 0.01 |
| Ti | 0.09 Mechanical |
| Tensile strength (MPa) | ≥690 |
| Yield Stress (MPa) | ≥610 |
| Elongation (%) | ≥16 |
| Impact values (J) | 130J/-20℃, 125J/-40℃ |
| Recommended | 1.0mm: F(H)-80-250A/ |
| V(OH)-70-160A 1.2mm | F(H)-100-300A/ |
| V(OH)-80-180A 1.6mm | F(H)-170-390A |
Mechanical property data for this grade is not published on the factory datasheet. Ask our technical team for the test record before you qualify it.
Note: 1. The protective gas is argon-rich or CO2-rich gas with a flow rate of 15-20L/min. 2. The weld must be cleaned of water, oil, embroidery and other impurities. 3. When the current is more than 250A, the wire dry elongation should be 20-25mm.20- 25mm
Technical Features
- NiMo-type solid wire for gas shielded arc welding of 700MPa high toughness low alloy steel.
- Chemical composition: C 0.070%, Si 0.46%, Mn 1.50%, S 0.004%, P 0.012%, Ni 1.34%, Cu 0.13%, Mo 0.45%, Al 0.01%, Ti 0.09%
- Deposited metal tensile strength ≥690 MPa, yield stress ≥610 MPa, elongation ≥16%
- Impact toughness: 130 J at minus 20 degrees C, 125 J at minus 40 degrees C.
- Supplied in 1.0 mm, 1.2 mm, and 1.6 mm diameters.
Use Guide
- Use argon-rich or CO2-rich shielding gas with a flow rate of 15-20 L/min.
- Clean the weld joint thoroughly to remove water, oil, grease, and other contaminants before welding.
- Maintain a wire dry extension of 20-25 mm when welding current exceeds 250 A.
- Select the correct current range based on wire diameter and position: 1.0 mm (F(H)-80-250 A / V(OH)-70-160 A), 1.2 mm (F(H)-100-300 A / V(OH)-80-180 A), 1.6 mm (F(H)-170-390 A)
How It Compares
AK-ER70SD is a NiMo-type solid wire designed for high-strength low alloy steel welding. It differs from standard ER70S-6 wires by offering higher tensile strength and improved low-temperature impact toughness. It is not intended for use on mild steel where lower strength and cost are acceptable. For applications requiring even higher toughness or specific alloying, other ER100S-G or ER110S-G wires may be considered.
Related Grades
Other welding wire in the same family.
AK-ER70SD Questions
What are the recommended welding parameters for each diameter?
What classifications does this wire meet?
What are the mechanical properties of the deposited metal?
What shielding gas and flow rate should be used?
What packing is AK-ER70SD supplied in?
Can we test AK-ER70SD before placing a production order?
Request a Quotation for AK-ER70SD
Send the diameter, the quantity and the destination port. Our technical team replies with packing, pricing and the data you need to qualify the grade.