D547Mo valve welding electrodes meet the GB EDCrNi-B-15 
 Description: D547Mo is a low hydrogen sodium type coating CrNiSiMo valve welding electrode. DC reverse. Deposited metal has good high temperature abrasion resistance, erosion resistance and other properties, have high hot hardness, good thermal stability and resistance to fatigue. Deposited metal age strengthening effect is remarkable, with the aging time increased, hardness and abrasion resistance to further improve performance. 

 Uses: temperature lower than 600 ℃ for the high pressure valve sealing surface surfacing. 

 Chemical Composition of Deposited Metal (%) Chemical Composition C Mn Si SP Ni Mo Cr Nb total amount of other elements 
 Guaranteed value ≤ 0.18 0.60 ~ 5.00 3.80 ~ 6.50 ≤ 0.030 ≤ 0.040 6.5 ~ 12.0 3.5 ~ 7.0 14.0 ~ 21.0 0.5 ~ 1.2 ≤ 2.50 

 Surfacing layer hardness: HRC ≥ 37 
 Reference Current (DC +) electrode diameter (mm) φ3.2 φ4.0 φ5.0 
 Welding current (A) 80 ~ 120 120 ~ 160 160 ~ 200 

 Note: 
 1. Welding electrodes shall be subject to 300 ℃ or so before baking 1h. 
 2. Welding large parts, small diameter hole or other steel valve body to a certain temperature is required preheat and slow cooling after welding. 
 3. Hardfacing welding required 3-4 continuous layer, not stopped surfacing layer processing should be not less than 5mm, hardness and chemical composition to ensure stability, but not too thick surfacing to avoid cracks.