Hardfacing Electrodes
SMA (EXTRA)
AWS: SFA
EN ISO CODE:
SMA(Extra) is a basic coated electrode producing an austenitic manganese steel weld metal which is crack resistant. The weld metal work hardens under impact loads in service and has excellent resistance to abrasion in combination with high impact. It is ideally suited for rebuilding of austenitic manganese steels to enhance the life of these components. The weld deposit work hardens in service and attains maximum resistance to abrasion combined with impact. Some typical applications include crusher jaws, hammer, bucket teeth and lips, manganese steel castings, etc.
Approvals
TYPICAL CHEMICAL COMPOSITION OF ALL WELD METAL (%)
| Element | C | Mn | Si | P |
S |
| Percent | 0.85 | 12.5 | 0.60 | 0.025 | 0.018 |
HARDNESS:
(Three layers deposit on mild steel)
170 240 BHN (As welded)
Work hardens up to 550 BHN (UNDER IMPACT)
CURRENT & PACKING DATA: AC / DC (+)
| Size (mm) | 6.3x450 | 5x450 | 4x350 | 3.15x350 |
| Current Range (Amps) | 240-290 | 170-230 | 140-180 | 100-140 |
| Weight / Carton (kgs) | 20 | 35 | 55 | 75 |
