Nikko Steel Kawat Las Elektroda For Superaustenitic Alloys and Modified Austenitics NCNb-25.35

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1. MANUFACTURERS OF A DIVERSE RANGE OF ADVANCED WELDING CONSUMABLES SECTION 8 NCNb-25.35 A CHEMICALLY BASIC FLUX COATED ELECTRODE THAT DEPOSITS A NIOBIUM STABILISED WELD METAL CONTAINING A NOMINAL 25Cr-35Ni RESISTANT TO THERMAL FATIGUE UP TO 1100 º C. DATA SHEET NO. 104 SPECIFICATION CLASSIFICATION NO SPECIFICATION EXISTS FOR THIS ELECTRODE, BUT IT MAY BE COMPOSITIONALLY CODED AS 25.35H.Nb.B PRODUCT DESCRIPTION Manufactured on a high purity Cr Ni wire, the chemically basic flux provides high resistance to microfissuring when welding thick sections and ensures low levels of non-metallic inclusions. The flux is extruded on to the core wire using a blend of silicates that ensures both coating strength and a coating resistant to subsequent moisture absorption . WELDING FEATURES OF THE ELECTRODE Suitable for use on DC+ only, the arc is stable and directional but strike and re- strikes should be made with the back-step technique. The weld beads are bright with fillet welds having a convex profile. Slag detachability is good even in thick butt welds. Positional welding is best undertaken with 3.2mm and smaller diameters. Metal recovery is some 130% with respect to weight of core wire. APPLICATIONS AND MATERIALS TO BE WELDED Designed for welding similarly alloyed castings covered by ASTM - ASME A297 HP40Cb. Proprietary alloys include: Paralloy H39W (Doncaster Paralloy) Lloyds T64 (LBA) Thermalloy 64 (Duralloy) Pyrotherm G25/35Nb and NbTZ (Pose Marre) For the above, the alloy provides good strength and creep resistance up to 1100 º C and is resistant to sigma phase formation and thus embrittlement. WELD METAL ANALYSIS COMPOSITION % BY Wt. C Mn Si S P Cr Ni Mo Nb Ti MIN 0.35 0.5 0.2 - - 23 32 - 0.8 0.05 MAX 0.50 2.0 1.0 0.03 0.04 27 36 0.5 1.5 0.20 TYPICAL 0.44 1.5 0.4 0.01 0.02 25 35 0.2 1.2 0.1 WELD METAL PROPERTIES (ALL WELD METAL) PROPERTY UNITS MINIMUM TYPICAL OTHERS Tensile strength N/mm 2 600 740 0.2% Proof stress N/mm 2 - 560 Elongation on 4d % 6 12 Reduction of Area (RA) % - 15 Impact energy 0 o C J - - HV 240 WELDING AMPERAGE AC or DC+ Ø (mm) 2.6 3.2 4.0 5.0 MIN 60 70 100 130 MAX 90 120 105 210 OTHER DATA Electrodes that have become damp should be re-dried at 180 o C for 1 hour. RELATED PRODUCTS Please contact our Technical Department for detail. WI-0304 DS104 NCNb-25.35, Rev. 0, Date 01.09.2008

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