1. UNCONTROLLED MANUFACTURERS OF A DIVERSE RANGE OF ADVANCED WELDING CONSUMABLES SECTION 4 RD-18C2 LOW HYDROGEN - IRON POWDER ELECTRODE FOR WELDING 3 to 3.5% NICKEL STEELS USED FOR CRYOGENIC WORK DOWN TO -80 0 C DATA SHEET NO. 35 SPECIFICATION AWS A5.5 BS EN ISO 2560-B CLASSIFICATION E8018-C2 E5518-N7 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 Fabrication of cryogenic plant and pipework mainly in the petrochemical industry operating down to -80 °C. Materials to be welded include: ASTM A333 - Grade 3 BS1503 - Grade 503 ASTM A350 - Grade LF3 Castings BS1504 - Grade 503 LT and ASTM A352 - Grade LC 3 For service temperature below -80 °C please contact technical department. C Mn Si S P Ni Fe MIN - - - - - 3.0 MAX 0.12 1.25 0.8 0.03 0.03 3.75 WELD METAL ANALYSIS COMPOSITION % BY Wt. TYPICAL 0.06 0.5 0.3 0.01 0.015 3.5 Bal. PROPERTY UNITS MINIMUM TYPICAL OTHERS Tensile strength N/mm 2 550 630 0.2% Proof stress N/mm 2 460 550 Elongation on 4d % 19 23 Reduction of Area (RA) % - 65 WELD METAL PROPERTIES (ALL WELD METAL) Impact energy -75 ºC J 27 90 PROPERTIES MAINTAINED AFTER PWHT AT 600 ºC Ø (mm) 2.6 3.2 4.0 5.0 MIN 60 90 140 180 WELDING AMPERAGE AC or DC+ MAX 100 150 190 220 OTHER DATA Electrodes that have become damp should be re-dried at 150 o C for 1 hour. RELATED PRODUCTS Please contact our Technical Department for detail. WI-0304 DS35 RD-18C2 Rev. 3, Date 01.12.2013