AK-H08Mn2MoA/AK-AF205 Submerged Arc Welding Wire and Flux for 600MPa Class Low Alloy Steel.
A submerged arc welding consumable combination designed for high-strength low alloy steel structures, delivering stable arc, clean bead formation, low hydrogen content, and excellent crack resistance at low temperatures.
Product Overview
AK-H08Mn2MoA is a submerged arc welding wire formulated for low alloy high strength steel, and AK-AF205 is an alkali-fluoride type sintered flux with light gray spherical particles sized 10-60 mesh. The combination is intended for submerged arc welding of 600MPa class low alloy steel structures.
The system provides good arc stability, consistent weld bead formation, easy slag removal, low diffused hydrogen content, and deposited metal with good crack resistance and impact toughness at low temperatures.
It is supplied to EN ISO —— AWS A5.23M F62A2/A4-EA3-A3 and GB/T 36037 SA FB 1 standards, with chemical and mechanical properties tailored for demanding structural applications.
Application: Ak-H08Mn2MoA is a submerged arc welding wire for low alloy high strength steel, AK- AF205 is an alkali-fluoride type sintered flux with light gray spherical particle size of 10-60 mesh. The combination of AK-H08Mn2MoA and AK-AF205 has good welding performance, arc stability, good forming, easy slag removal, low diffused hydrogen content, good crack resistance and low temperature impact toughness of deposited metal. Suitable for the welding of 600MPA class low alloy steel structure such as ship, machinery manufacture, chemical industry, bridge, steel structure and so on.
Key Benefits
Stable Arc and Clean Bead Formation.
The AK-AF205 flux ensures a stable arc and consistent weld pool behavior, resulting in a smooth, well-formed bead with minimal spatter and easy slag removal.
Low Diffused Hydrogen Content.
The alkali-fluoride composition of AK-AF205 limits diffused hydrogen in the deposited metal, reducing the risk of hydrogen-induced cracking in high-strength steels.
Good Crack Resistance and Low-Temperature Toughness.
Deposited metal achieves impact values of at least 27 J at minus 20 degrees C and 95 J at minus 40 degrees C, supporting use in low-temperature environments.
Compatibility with 600MPa Class Steels.
The combination is suitable for welding 600MPa class low alloy steel structures used in shipbuilding, machinery, chemical plants, bridges, and steel structures.
Where It Is Used
- Welding of 600MPa class low alloy steel structures in shipyards.
- Heavy machinery and equipment fabrication.
- Chemical plant and pressure vessel construction.
- Bridge and large steel structure fabrication.
- High-strength steel components requiring low-temperature toughness.
Who It Is For
- Welding consumable distributors supplying submerged arc welding systems for structural steel.
- Fabricators working with 600MPa class low alloy steels in demanding environments.
- Contractors in shipbuilding, energy, and heavy industry requiring reliable, code-compliant welding consumables.
Problems It Solves
- Achieving low hydrogen levels and crack resistance in high-strength steel welds without requiring post-weld heat treatment.
- Maintaining consistent weld quality and mechanical properties in thick-section and low-temperature applications.
- Reducing rework caused by poor slag removal, hydrogen cracking, or inadequate impact toughness in the deposited metal.
Specifications
Published by the factory for AK-H08Mn2MoA/AK-AF205. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification 1 | EN ISO —— AWS A5.23M F62A2/A4-EA3-A3 |
| Classification 2 | GB/T 36037 SA FB 1 |
| Element | Content |
|---|---|
| C | 0.060-0.11 |
| Si | 0.25 |
| Mn | 1.60-1.90 |
| S | 0.030 |
| P | 0.030 |
| Ni | 0.30 |
| Cu | 0.35 |
| Mo | 0.50-0.70 |
| Cr | 0.20 |
| Ti | 0.05-0.15 Mechanical |
| Tensile strength (MPa) | 620-760 |
| Yield Stress (MPa) | ≥540 |
| Elongation (%) | ≥17 |
| Impact values (J) | ≥27J/-20℃, 95J/-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 300 ~ 350 ° 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. Flux Quality Requirements: 1, flux water content ≤0.10% 2, flux mechanical inclusions ≤0.30. 3, flux sulfur content s0.050% 4, flux phosphorus content ≤0.060% Requirements for radiographic testing of deposited metals : Grade I
Technical Features
- Submerged arc welding wire AK-H08Mn2MoA with chemical composition: C 0.060-0.11, Si 0.25, Mn 1.60-1.90, S 0.030, P 0.030, Ni 0.30, Cu 0.35, Mo 0.50-0.70, Cr 0.20, Ti 0.05-0.15.
- Sintered flux AK-AF205 with light gray spherical particles, 10-60 mesh, alkali-fluoride type.
- Deposited metal tensile strength 620-760 MPa, yield stress ≥540 MPa, elongation ≥17 percent.
- Impact toughness ≥27 J at minus 20 degrees C, ≥95 J at minus 40 degrees C.
- Flux water content ≤0.10 percent, mechanical inclusions ≤0.30 percent, sulfur content ≤0.050 percent, phosphorus content ≤0.060 percent.
- Radiographic testing of deposited metal meets Grade I requirements.
Use Guide
- Bake AK-AF205 flux at 300 to 350 degrees C for 1 to 2 hours before use.
- Ensure AK-H08Mn2MoA wire is dry, oil-free, and rust-free before welding.
- Clean joint surfaces thoroughly to remove oil, rust, moisture, and other contaminants prior to welding.
- Use flux with water content ≤0.10 percent and mechanical inclusions ≤0.30 percent for optimal performance.
- Verify flux sulfur content ≤0.050 percent and phosphorus content ≤0.060 percent to meet quality requirements.
How It Compares
AK-H08Mn2MoA/AK-AF205 is a submerged arc welding system for high-strength low alloy steel. It differs from basic fluxes in its alkali-fluoride composition, which provides lower hydrogen content and better slag removal. Compared to rutile or mixed fluxes, it offers superior crack resistance and low-temperature impact properties. It is not intended for use with low-strength steels where simpler systems may be sufficient.
Related Grades
Other welding wire in the same family.
AK-H08Mn2MoA/AK-AF205 Questions
What are the chemical composition limits for AK-H08Mn2MoA?
What mechanical properties does the deposited metal achieve?
What are the flux quality requirements?
What is the recommended flux baking temperature and time?
What packing is AK-H08Mn2MoA/AK-AF205 supplied in?
Can we test AK-H08Mn2MoA/AK-AF205 before placing a production order?
Request a Quotation for AK-H08Mn2MoA/AK-AF205
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.