Hardfacing Electrodes
ES 420 / EN 14700: E Z Fe8
Description
ES 420 Heavily coated electrode that produces a martensitic deposit similar to AISI 420 stainless steel Designed for abrasion resistance under high corrosion conditions. The electrode coating permits the use of the drag or contact welding technique as well as positional welding if required. It can be machined by grin ding. Re-drying is 300°C min 2 h.
Typical Chemical Composition (%)
| Si | Mn | Mo | Cr | C | V |
|---|---|---|---|---|---|
| 0.40 | 0.30 | 0,4 | 12.0 | 0.50 | 1,3 |
Typical Mechanical Properties
| Yeild Strength | Tensile Strength | Elongation 5x D | Impact (ISO-V) |
|---|---|---|---|
Applications
It is used for hard facing of alloyed and unalloyed steels. Worn surfaces of crushing tools in the mining industry, conveyor screws, excavator bucket and teeth, excavator and bulldozer blades, mixer parts screws of cement pumps, and cutting edges of cold worked tool steels can be hard facing with it. While there is no need to have a buffer layer for unalloyed steels up to St 70 ; or high alloyed steels, it is recommended to have a buffer layer with E 7018 or E 7018-1, and in special cases with E 307-15 or E 318-16 Hardening in oil or air at 950°C - 1000°C, Softening in furnace at 850°C.
Sizes Available & Recomennded Currents
| Diam. (mm) | Length (mm) | Current (Amperes) | Arc Voltage | Wire Feed |
|---|---|---|---|---|
| 3.25 | 350 | 110 - 140 | ||
| 4.0 | 450 | 150 - 190 | ||
| 5.0 | 450 | 180 - 260 |
Welding Current
AC Min. 65 V. / DC { + }
Welding Positions
 Flat |
 Horizontal |
 Vertical Up |
 Overhead |
Hardness (HB)
55 (HR)