Flux

ROYAL FLUX 4

AWS/ASME: A5.17 F7A4-EM12K

ROYAL FLUX 4 is a fused flux specially designed for use with EM12K submerged arc welding wires.
Provides high tensile strength and impact toughness, even at low temperatures.
Ensures stable arc characteristics with smooth bead appearance.
Excellent slag detachability for multi-pass welding.
Designed for pressure vessels, bridges, structural steel, offshore rigs, and shipbuilding.
Hydrogen-controlled flux, reducing risk of cold cracking.

1. Typical Chemical Composition of Weld Metal

C	Mn	Si	S	P
0.08 – 0.13	0.90 – 1.40	0.20 – 0.45	≤ 0.025	≤ 0.025

2. Typical Mechanical Properties of Weld Metal

Property	UTS (MPa)	Yield Strength (MPa)	Elongation (%)	Impact Toughness (J @ -40 °C)
Typical Values	580 – 640	500 – 560	24 – 30	60 – 80

3. Recommended Welding Parameters — AWS A5.17 F7A4-EM12K

Welding Position	Current (A)	Voltage (V)	Polarity	Flux Consumption (kg/kg Wire)
Flat / Horizontal	400 – 1000	28 – 42	AC / DCEP	0.9 – 1.1

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