D516MA valve welding electrodes meet the GB EDCrMn-A-16 
 Description: D516MA is a low hydrogen potassium type coating for high chromium manganese steel surfacing electrode, deposited metal has good wear resistance, heat resistance, corrosion resistance and thermal cracking performance, welding process is simple, no preheating before welding, without heat treatment after welding, surfacing layer can be cutting. 

 Uses: used in welding temperature below 450 ℃ under water, steam, oil under medium components, such as 25, cast steel, high pressure valve sealing surface. 

 Chemical Composition of Deposited Metal (%) Chemical Composition C Mn Si Cr 
 Guaranteed value ≤ 0.25 6.00 ~ 8.00 ≤ 1.00 12.0 ~ 14.0 

 Surfacing layer hardness: HRC ≥ 38-48 
 Reference current (AC, DC +) electrode diameter (mm) φ3.2 φ4.0 φ5.0 
 Welding current (A) 80 ~ 120 120 ~ 160 180 ~ 190 

 Note: 
 1. 300-350 ℃ before welding electrodes shall be baked 1h. 
 2. Welding weldment should be on the former oil and impurities to clean up.