KF-550/KW-3
Basicity：1.2
KF-550+KW-3 is suitable for welding 490N/mm² grade steel.
KUANG TAI METAL INDUSTRIAL CO., LTD.
廣泰金屬工業股份有限公司
No.20, Gongye Rd., Erzhen, Guantian Dist.
Tainan City 72042, Taiwan
TEL：886-6-6987615 FAX：886-6-6987315
▎Classification
| AWS A5.17/A5.17M | F7A2-EM12K/F49A3-EM12K |
| JIS Z3183 | S502-H |
| EN ISO 14171-A | S42 3 AB S2Si |
| GB T5293 | F5A3-H08MnA |
▎Applications and Features
- KF-550+KW-3 is suitable for welding 490N/mm² grade steel.
- KF-550 is an agglomerated aluminate-basic type flux, providing good bead appearance, high current resistance, and excellent slag detachability.
- Ideal for single- or multi-electrode welding of thick plates in steel structures, pressure vessels, shipbuilding, and bridges.
▎Welding Position
▎Welding Instruction
Please refer to Appendix E.
▎Application
Ideal for single- or multi-electrode welding of thick plates in steel structures, pressure vessels, shipbuilding, and bridges.
▎Typical Chemical Composition of Weld Metal (wt%)
| C | Si | Mn | P | S |
| 0.05 | 0.42 | 1.51 | 0.018 | 0.007 |
▎Typical Mechanical Properties of Weld Metal
| Tensile Strength N/mm² | Yield Strength N/mm² | Elongation % | Charpy V-Notch ℃ | Charpy V-Notch J |
| 522 | 426 | 32 | -30 | 54 |