AK-55QNH Low-Alloy Steel Solid Wire for Corrosion-Resistant Bridge Steel Welding.
A gas shielded solid welding wire designed for high atmospheric corrosion resistance and excellent mechanical properties in critical bridge applications using weathering steels like Q420NH.
Product Overview
AK-55QNH is a low-alloy steel solid welding wire for gas metal arc welding (GMAW) of weathering steels such as Q420NH. It is formulated to deliver excellent atmospheric corrosion resistance in the weld metal, extending service life under diverse climatic conditions.
The wire meets the GB/T 8110 ER55-G standard and is intended for structural welding where both mechanical performance and long-term durability are required. Its chemical composition includes controlled levels of copper, nickel, chromium, and silicon to enhance corrosion resistance and crack resistance in the deposited metal.
Application: Used for welding of important bridge corrosion-resistant steel such as Q420NH, etc.
Key Benefits
Excellent Atmospheric Corrosion Resistance.
The weld metal produced by AK-55QNH exhibits strong resistance to atmospheric corrosion, meeting the performance demands of bridge structures exposed to harsh weather and varying environmental conditions.
High Mechanical Properties in Weld Metal.
The wire delivers robust mechanical properties in the deposited metal, with a balanced composition that supports strength and toughness suitable for critical structural applications.
Good Crack Resistance
The chemical formulation of AK-55QNH reduces the risk of solidification and hydrogen-induced cracking, improving weld integrity in thick-section and high-stress joints.
Compatibility with Weathering Steels.
Designed specifically for welding Q420NH and similar weathering steels, the wire maintains the corrosion-resistant characteristics of the base metal in the weld zone.
Where It Is Used
- Welding of important bridge structures made from weathering steel such as Q420NH.
- Structural welding in outdoor environments exposed to moisture, salt, and temperature variation.
- Critical joints in steel bridges where long-term durability and minimal maintenance are required.
Who It Is For
- Bridge fabricators and contractors requiring corrosion-resistant welds for long-life structures.
- Steel structure fabricators working with weathering steels in demanding environments.
- Welding engineers specifying consumables for projects with high durability and low maintenance expectations.
Problems It Solves
- Achieving consistent atmospheric corrosion resistance in the weld zone when joining weathering steels like Q420NH.
- Maintaining mechanical strength and crack resistance in thick-section or high-stress joints without post-weld heat treatment.
- Sourcing a single wire that matches both the base metal’s corrosion performance and structural requirements.
Specifications
Published by the factory for AK-55QNH. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification | GB/T 8110 ER55-G |
| Element | Content |
|---|---|
| C | 0.10 |
| Mn | 0.6-1.20 |
| P | 0.025 |
| S | 0.020 |
| Si | 0.60 |
| Cu | 0.20-0.50 |
| Ni | 0.20-0.60 |
| Cr | 0.30-0.90 |
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.
| Diameter | Current range |
|---|---|
| 0.8mm | F/H-50-180A / V(OH)-50-100A |
| 1.0mm | F/H-80-250A / V(OH)-70-160A |
| 1.2mm | F/H-100-360A / V(OH)-80-220A |
| 1.6mm | F/H-250-500A |
Technical Features
- Low-alloy steel solid wire for GMAW, meeting GB/T 8110 ER55-G.
- Chemical composition: C 0.10%, Mn 0.6–1.20%, P 0.025%, S 0.020%, Si 0.60%, Cu 0.20–0.50%, Ni 0.20–0.60%, Cr 0.30–0.90%
- Weld metal designed for excellent atmospheric corrosion resistance and good crack resistance.
- Available in diameters: 0.8 mm, 1.0 mm, 1.2 mm, and 1.6 mm.
Use Guide
- Select wire diameter based on joint thickness and welding position: 0.8 mm for thin sections, 1.6 mm for high deposition rates.
- Use the recommended current ranges: 0.8 mm – 50–180 A flat/horizontal, 50–100 A vertical/overhead; 1.0 mm – 80–250 A flat/horizontal, 70–160 A vertical/overhead; 1.2 mm – 100–360 A flat/horizontal, 80–220 A vertical/overhead; 1.6 mm – 250–500 A flat/horizontal.
- Ensure proper shielding gas flow and joint preparation to avoid porosity and ensure full fusion.
- Store wire in sealed packaging to prevent moisture absorption; use only if the wire remains dry before welding.
How It Compares
AK-55QNH is a solid wire for GMAW of weathering steel, differing from flux-cored wires in its clean weld metal and consistent deposition. It is not intended for use with base metals outside the Q420NH range. Compared to standard low-carbon wires, AK-55QNH provides enhanced corrosion resistance and mechanical performance in the weld zone, making it suitable for outdoor structural applications where long-term durability is required.
Related Grades
Other welding wire in the same family.
AK-55QNH Questions
What standards does AK-55QNH meet?
What is the chemical composition of AK-55QNH?
What are the recommended welding parameters?
Which base metals is AK-55QNH suitable for?
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Can we test AK-55QNH before placing a production order?
Request a Quotation for AK-55QNH
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.