Low Alloy Steel

ROYAL PRIME A1

AWS/ASME: A5.29 E81T1-A1

ROYAL PRIME A1 is a low alloy flux-cored wire designed for welding 0.5% Mo creep-resistant steels. It provides good tensile strength, toughness, and creep resistance under elevated temperature service conditions. Typical applications include boilers, pressure vessels, piping, and structural components in power plants and refineries.

1. Typical Chemical Composition of Weld Metal (% by weight)

C	Mn	Si	Mo	P	S
0.05 – 0.12	0.80 – 1.25	0.20 – 0.80	0.40 – 0.65	≤0.03	≤0.03

2. Typical Mechanical Properties of Weld Metal

Property	UTS (MPa)	Yield Strength (MPa)	Elongation (%)	Impact Toughness
Typical Values	570 – 690	480 – 520	20 – 25	40 – 60 J @ –29°C

3. Recommended Welding Parameters — A5.29 E81T1-A1

Welding Position	Current (A)	Voltage (V)	Shielding Gas	Gas Flow (L/min)
Flat / Horizontal	180 – 360	25 – 34	CO₂ or Ar + 20–25% CO₂ (mix)	15 – 25
Vertical / Overhead	150 – 280	23 – 32	CO₂ or Ar + 20–25% CO₂ (mix)	15 – 25

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