AK-S80A/ AK-AF80SD Submerged Arc Welding Wire and Flux for 800MPa High-Strength Steel.
A copper-plated wire and fluorine-base sintered flux combination for submerged arc welding of high-strength low alloy steels, delivering stable arc, low impurity content, and excellent low-temperature toughness.
Product Overview
AK-S80A is a copper-plated submerged arc welding wire for low alloy high strength steel, and AK-AF80SD is a fluorine-base type sintered flux with light gray spherical particles in the size range of 12 to 50 mesh.
The combination of AK-S80A and AK-AF80SD provides excellent welding process performance, including stable DC arc with positive electrode polarity, a well-shaped weld bead, and easy slag removal.
The deposited metal has low sulfur and phosphorus content, which contributes to high crack resistance and excellent low-temperature impact toughness.
This system is primarily used for welding 800 MPa grade high-strength steel pressure pipelines in pumped storage energy and large hydropower equipment, and is also suitable for critical structures made of Q690E and E690 alloy steel such as ocean engineering components, ships, bridges, and pressure vessels.
Application: AK-S80A is a submerged arc welding wire for low alloy high strength steel, AK-AF80SD is a fluorine-base type sintered flux, light gray spherical particle, particle size 12 ~ 50 mesh, copper-plated wire AK-S80A and flux AK-AF80SD combination, it can obtain excellent welding process performance, DC welding, welding wire positive electrode, arc stability, beautiful shape, easy slotting slag, weld metal S, P content is low, with excellent low temperature impact toughness and crack resistance. Mainly used for pumping energy storage, large hydropower equipment 800MPa grade high-strength steel pressure pipeline welding. It is also suitable for welding important structures of Q690E and E690 alloy steel such as ocean engineering, ships, bridges, pressure vessels, etc.
Key Benefits
Stable Arc with Positive Electrode Polarity.
The system delivers a stable DC arc when the welding wire is connected to the positive terminal, ensuring consistent welding performance and reduced spatter.
Low Sulfur and Phosphorus in Deposited Metal.
Sulfur content is 0.004 percent and phosphorus content is 0.010 percent, which enhances crack resistance and improves weld metal cleanliness.
Excellent Low-Temperature Impact Toughness.
The deposited metal achieves 130 J at minus 40 degrees C, meeting the requirements for service in cold environments.
Easy Slag Removal and Clean Bead Profile.
The flux produces a slag that lifts off easily, reducing post-weld cleaning time and minimizing the risk of slag inclusions.
Where It Is Used
- Welding of 800 MPa grade high-strength steel pressure pipelines in pumped storage energy and large hydropower equipment.
- Welding of critical structures in ocean engineering, ships, and bridges made from Q690E and E690 alloy steel.
- Pressure vessel fabrication requiring high crack resistance and low-temperature toughness.
Who It Is For
- Welding consumable distributors supplying high-strength steel welding systems.
- Fabricators of large hydropower and pumped storage equipment.
- Contractors working on offshore structures and heavy steel infrastructure requiring reliable, code-compliant welds.
Problems It Solves
- Achieving low sulfur and phosphorus levels in deposited metal to prevent cracking in high-strength steel welds.
- Maintaining arc stability and weld bead quality during submerged arc welding of thick-section high-strength steels.
- Ensuring low-temperature toughness in critical welds exposed to cold service environments.
Specifications
Published by the factory for AK-S80A/ AK-AF80SD. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification | EN ISO —— AWS A5.23M F76A4-EG-G GB/T 36037 SA FB 1 |
| Element | Content |
|---|---|
| C | 0.035 |
| Si | 0.39 |
| Mn | 1.53 |
| S | 0.004 |
| P | 0.010 |
| Ni | 2.13 |
| Cu | 0.06 |
| Mo | 0.50 |
| Cr | 0.27 Mechanical |
| Tensile strength (MPa) | 780-900 |
| Yield Stress (MPa) | ≥680 |
| Elongation (%) | ≥15 |
| Impact values (J) | 130J/-40℃ |
| Recommended | —— |
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. before the use of flux must be 350 ° C ~ 400 ° C baking 1 ~ 2 hours, welding wire before use should be dry, oil-free, rust-free state. 2. before welding should be strictly removed welding oil, rust, moisture and other impurities. 3. Recommended welding specifications (taking φ4.0 wire as an example) i = (525 ± 50) a, U = (30 ± 2) V, welding speed V = (38 ± 2) cm/min, and inter-pass temperature (150 ± 15) ° 4. To ensure the plasticity of deposited metal, it is necessary to dehydrogen at 200 ~ 240 °C for 2 ~ 4 hours after welding. 5. welding materials in the storage room to keep dry, and the ground and wall to keep a certain distance. Storage should pay attention to distinguish models, specifications, can not be mixed up. Flux Quality Requirements: 1. Flux water content0.10% 2. Mechanical inclusions ≤0.30. 3 in flux, flux s 0.050% 4. Flux p content ≤0.060% Deposited metal x-ray detection requirements: Grade I
Technical Features
- Copper-plated AK-S80A wire with chemical composition: C 0.035%, Si 0.39%, Mn 1.53%, Ni 2.13%, Mo 0.50%, Cr 0.27%, Cu 0.06%
- AK-AF80SD fluorine-base sintered flux with particle size 12 to 50 mesh, light gray spherical particles.
- Deposited metal tensile strength 780 to 900 MPa, yield stress at least 680 MPa, elongation at least 15 percent.
- Impact toughness at least 130 J at minus 40 degrees C.
- Flux water content less than 0.10%, mechanical inclusions less than 0.30%, sulfur content less than 0.050%, phosphorus content less than 0.060%
- Deposited metal X-ray detection requirement: Grade I.
Use Guide
- Before use, bake the flux at 350 to 400 degrees C for 1 to 2 hours.
- Ensure the welding wire is dry, oil-free, and rust-free before welding.
- Clean the joint surfaces thoroughly to remove oil, rust, moisture, and other contaminants.
- For φ4.0 mm wire, recommended parameters are current 525 ± 50 A, voltage 30 ± 2 V, welding speed 38 ± 2 cm/min, and inter-pass temperature 150 ± 15 degrees C.
- After welding, perform dehydrogenation treatment at 200 to 240 degrees C for 2 to 4 hours to ensure deposited metal plasticity.
- Store welding materials in a dry environment, with separation from the floor and walls, and keep different models and specifications distinct to avoid mixing.
How It Compares
AK-S80A/ AK-AF80SD is a submerged arc welding system designed for high-strength low alloy steels. It differs from standard carbon steel fluxes by offering lower sulfur and phosphorus content, higher impact toughness at low temperatures, and better crack resistance. It is not suitable for applications requiring basic fluxes with ultra-low hydrogen content, nor for welding materials below 690 MPa where simpler systems may suffice.
Related Grades
Other welding wire in the same family.
AK-S80A/ AK-AF80SD Questions
What are the recommended baking conditions for the flux?
What are the chemical composition limits for sulfur and phosphorus in the flux?
What are the mechanical properties of the deposited metal?
What is the required post-weld heat treatment?
What packing is AK-S80A/ AK-AF80SD supplied in?
Can we test AK-S80A/ AK-AF80SD before placing a production order?
Request a Quotation for AK-S80A/ AK-AF80SD
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.