AK-W907Ni Low-Temperature Steel Electrode for -90℃ Service.
A low-hydrogen sodium-coated electrode for all-position welding of 3.5Ni low-temperature steel, maintaining impact toughness down to -90℃.
Product Overview
AK-W907Ni is a low-temperature steel electrode with a low-hydrogen sodium coating containing nickel, designed for use with DC reverse polarity and all welding positions.
The deposited metal retains impact toughness of at least 27 J at -90℃, making it suitable for critical applications in cryogenic environments.
It meets EN ISO 2560-B:E 8015-2, AWS A5.5 E8015-C2, and GB/T 5117 E5515-N7 classifications, with a chemical composition tailored for low-temperature performance.
Application: Welding 3.5Ni low-temperature low-alloy steel structures working at – 90℃.
Key Benefits
Impact Toughness at -90℃.
The deposited metal achieves a minimum impact value of 27 J at -90℃, ensuring reliable performance in extreme cold environments.
Low-Hydrogen Sodium Coating
The low-hydrogen sodium coating minimizes hydrogen content in the weld metal, reducing the risk of cold cracking in high-strength low-alloy steels.
All-Position Welding Capability
Suitable for flat, horizontal, vertical, and overhead welding positions, allowing consistent performance across complex joint geometries.
Ni-Enhanced Low-Temperature Performance
With nickel content between 3.0% and 3.75%, the electrode delivers improved toughness and ductility in low-temperature service conditions.
Where It Is Used
- Welding of 3.5Ni low-temperature low-alloy steel structures operating at -90℃.
- Cryogenic storage tanks and pressure vessels in cold climates.
- Offshore and Arctic platform components exposed to extreme cold.
- Pipelines and structural components in low-temperature environments.
Who It Is For
- Welding consumable distributors supplying low-temperature welding electrodes.
- Fabricators working with 3.5Ni steel for cryogenic applications.
- Oil and gas contractors requiring certified electrodes for low-temperature service.
Problems It Solves
- Achieving required impact toughness at -90℃ in welds made on 3.5Ni steel, where standard electrodes fail to meet code requirements.
- Avoiding cold cracking in high-strength low-alloy steels due to hydrogen in the weld metal, solved by using a low-hydrogen sodium-coated electrode.
- Sourcing a single electrode that meets multiple international standards (EN ISO, AWS, GB) for low-temperature service without switching suppliers.
Specifications
Published by the factory for AK-W907Ni. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO 2560-B:E 8015-2 |
| Classification 2 | AWS A5.5 E8015-C2 |
| Classification 3 | GB/T 5117 E5515-N7 |
| Element | Content |
|---|---|
| C | 0.12 |
| Si | 0.80 |
| Mn | 1.25 |
| S | 0.030 |
| P | 0.030 |
| Ni | 3.0-3.75 |
| Property | Value |
|---|---|
| Tensile strength (MPa) | ≥550 |
| Yield Stress (MPa) | ≥460 |
| Elongation (%) | ≥17 |
| Impact values (J) | ≥27J/-90℃ |
| Diameter | Current range |
|---|---|
| 2.5mm | 60-100A |
| 3.2mm | 80-130A |
| 4.0mm | 140-200A |
| 5.0mm | 180-240A |
Technical Features
- Low-hydrogen sodium coating with nickel content between 3.0% and 3.75%
- Deposited metal tensile strength at least 550 MPa, yield stress at least 460 MPa, elongation at least 17%
- Impact toughness at least 27 J at -90℃.
- Supplied in 2.5 mm, 3.2 mm, 4.0 mm, and 5.0 mm diameters with published current ranges.
- Meets EN ISO 2560-B:E 8015-2, AWS A5.5 E8015-C2, and GB/T 5117 E5515-N7 classifications.
Use Guide
- Select diameter by joint thickness and set current within the recommended range: 2.5 mm (60-100 A), 3.2 mm (80-130 A), 4.0 mm (140-200 A), 5.0 mm (180-240 A).
- Use DC reverse polarity (DCEN) for stable arc and consistent weld quality.
- Keep electrodes dry in sealed packaging; re-dry if exposed to moisture before use.
- Clean joint surfaces thoroughly to remove oil, rust, paint, and moisture before welding.
How It Compares
AK-W907Ni and E8015-C2 both provide low-hydrogen, all-position welding for low-temperature service, but AK-W907Ni is specifically formulated for 3.5Ni steel with nickel content between 3.0% and 3.75%. Standard E8015 electrodes may not achieve the same impact toughness at -90℃. E8015-C2 is a general-purpose low-hydrogen electrode, while AK-W907Ni is optimized for cryogenic applications requiring high toughness at extreme temperatures.
Related Grades
Other welding electrodes in the same family.
AK-W907Ni Questions
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