1. UNCONTROLLED MANUFACTURERS OF A DIVERSE RANGE OF ADVANCED WELDING CONSUMABLES SECTION 4 CR-718 LOW HYDROGEN - IRON POWDER ELECTRODE FOR WELDING DEOXIDISED C-Mn STEELS WITH HIGHER SUB-ZERO TOUGHNESS PROPERTIES DATA SHEET NO. 24 SPECIFICATION AWS A5.1 BS EN ISO 2560B JIS Z 3212 CLASSIFICATION E7018 E4918 D5016 PRODUCT DESCRIPTION The design emphasis of the chemically basic flux is engineered to ensure the optimum weld metal properties demanded by the speci fication 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 . WELDING FEATURES OF THE ELECTRODE The chemical nature of the flux together with a sig nificant proportion of iron powder ensures maximum deposition efficiency withou t 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. APPLICATIONS AND MATERIALS TO BE WELDED As with RD718 it is suitable for all grades of CM n structural steels. However, it is used to best advantage on fully deoxidised CMn steels when high toughness values are specified down to 45 o C. These toughness properties are maintained even afte r 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 th ick restrained sections. C Mn Si S P Cr Ni Mo V Fe MIN          MAX 0.15 1.6 0.75 0.035 0.035 0.2 0.3 0.3 0.08 WELD METAL ANALYSIS COMPOSITION % BY Wt. TYPICAL 0.06 1.4 0.35 0.01 0.02 0.05 0.06 0.03 0.02 Bal. PROPERTY UNITS MINIMUM TYPICAL OTHERS Tensile strength N/mm 2 490 600 0.2% Proof stress N/mm 2 400 500 Elongation on 4d % 22 28 Reduction of Area (RA) %  70 WELD METAL PROPERTIES (ALL WELD METAL) Impact energy 30 o C J 27 100 Ø mm) 2.6 3.2 4.0 5.0 MIN 50 75 130 180 WELDING AMPERAGE AC or DC+ MAX 85 125 170 220 OTHER DATA Electrodes that have become damp should be redried at 150 o C for 1 hour. RELATED PRODUCTS Please contact our Technical Department for detail. WI-0304 DS24 CR-718 Rev. 3, Date 01.11.2013