4.0 X 350MM RD-718 E7018 X 5.0KG SP NIKKO STEELS ELECTRODES SP: STANDARD PACK

The design emphasis of the chemically basic flux is engineered to ensure the optimum weld metal properties demanded by the specification are fully met. The basic flux containing the appropriate alloying elements with a controlled balanced addition of iron powder is extruded onto a high-purity ferritic core wire with a blend of silicates that ensures both coating strength and a coating resistant to subsequent moisture absorption.

The chemical nature of the flux together with a significant proportion of iron powder ensures maximum deposition efficiency without detracting from its ability to be used in all positions except vertical down. Overall the arc is very stable, slag detachability is good and metal recovery is some 115% with respect to the core wire.

As with RD-718, it is suitable for all grades of C-Mn structural steels. However, it is used to best advantage on fully deoxidised C-Mn steels when high toughness values are specified down to -45 ºC. These toughness properties are maintained even after extended PWHT, making it ideal for pressure vessel work. The low weld Si and high Mn to Si ratio ensure maximum resistance to solidification cracking on thick restrained sections.