ROYAL PRIME 81W is a low alloy flux-cored wire designed for welding weathering steels (ASTM A242, A588, and similar grades). It provides weld metal with excellent resistance to atmospheric corrosion and high strength properties. Ideal for bridges, transmission towers, railway wagons, and outdoor structural fabrications.
| C | Mn | Si | Ni | Cu | Cr | P | S |
| 0.05 – 0.12 | 0.50 – 1.30 | 0.35 – 0.80 | 0.40 – 0.80 | 0.30 – 0.75 | 0.45 – 0.70 | ≤0.03 | ≤0.03 |
| Property | UTS (MPa) | Yield Strength (MPa) | Elongation (%) | Impact Toughness |
| Typical Values | 560 – 690 | 480 – 530 | 19 – 26 | 55 – 70 J @ –29°C |
| Welding Position | Current (A) | Voltage (V) | Shielding Gas | Gas Flow (L/min) |
| Flat / Horizontal | 180 – 350 | 24 – 34 | CO₂ / Mix Gas (Ar+CO₂) | 15 – 25 |
| Vertical / Overhead | 120 – 280 | 22 – 32 | CO₂ / Mix Gas (Ar+CO₂) | 15 – 25 |
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