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Low Alloy Steel

ROYAL PRIME K2

AWS/ASME: A5.29 E81T1-K2

ROYAL PRIME K2 is a low alloy flux-cored wire developed for applications requiring high impact toughness at subzero temperatures. It provides excellent crack resistance and notch toughness, making it suitable for offshore structures, bridges, shipbuilding, pressure vessels, and cryogenic service piping.

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

C Mn Si Ni Mo Cr P S
0.04 – 0.15 0.50 – 1.75 0.20 – 0.80 1.0 – 2.0 ≤0.35 ≤0.15 ≤0.03 ≤0.03

2. Typical Mechanical Properties of Weld Metal

Property UTS (MPa) Yield Strength (MPa) Elongation (%) Impact Toughness
Typical Values 570 – 610 480 – 530 20 – 26 60 – 100 J @ –60°C

3. Recommended Welding Parameters — A5.29 E81T1-K2

Welding Position Current (A) Voltage (V) Shielding Gas Gas Flow (L/min)
Flat / Horizontal 170 – 350 24 – 34 100% CO₂ or Ar + 20–25% CO₂ 15 – 25
Vertical / Overhead 140 – 280 22 – 32 100% CO₂ or Ar + 20–25% CO₂ 15 – 25

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