1. MANUFACTURERS OF A DIVERSE RANGE OF ADVANCED WELDING CONSUMABLES SECTION 9 NS-300 LOW HYDROGEN MEDIUM ALLOYED HIGH EFFICIENCY HARDFACING ELECTRODE WITH EXCELLENT RESISTANCE TO IMPACT INDUCED COMPRESSIONAL STRESSES DATA SHEET NO. 131 SPECIFICATION CLASSIFICATION - PRODUCT DESCRIPTION The design emphasis of the chemically basic flux is engineered to ensure that the weld metal hardness levels demanded by the specification are fully met without detracting from the toughness levels associated with this class of alloy. The basic flux containing the appropriate alloying elements and a balanced addition of iron powder is extruded onto a high purity ferritic core wire using a balance of silicates that ensures both coating strength and resistance to moisture absorption. WELDING FEATURES OF THE ELECTRODE The electrode is suitable for both AC and DC and may be used in all positions except vertical down. Arc stability is good as is slag detachability. Weld seams are smooth, evenly rippled and slightly convex in shape. The metal recovery of the electrode is some 120% with respect to weight of the core wire. APPLICATIONS AND MATERIALS TO BE WELDED Many die forming blocks in the drop forging industry are continuously subjected to impact induced compressional stresses combined with thermal shock from insertion of the hot blank and removal fo the shaped product. HV 300 ensures for such applications freedom from die distortion due to its high strength level freedom from cracking due to its exceptional toughness and resistance to oxidation due to the balanced ratio of chrome - nickel and molybdenium. WELD METAL ANALYSIS COMPOSITION % BY Wt. C Mn Si S P Cr Ni Mo Fe MIN 0.06 0.8 - - - 1.0 2.8 0.9 MAX 0.12 1.2 0.5 0.03 0.03 1.4 3.3 1.2 TYPICAL 0.1 1.0 0.4 0.01 0.02 1.2 3.0 1.1 Bal. WELD METAL HARDNESS (ALL WELD METAL) AS WELDED (PREHEAT & INTERPASS Vickers (HV) Rockwell (HRC) 150 0 C 270 – 300 26 – 30 250 0 C 300 – 360 30 – 36 PWHT 590 – 600 0 C 300 30 OTHER PROPERTIES UTS 120N/mm 2 Charpy V at -30°C : 40J WELDING AMPERAGE AC or DC+ Ø (mm) 2.6 3.2 4.0 5.0 MIN 60 80 130 170 MAX 90 140 190 210 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 DS131 NS-300 Rev. 1, Date 01.12.2013