D557 valve welding electrodes type: EDCrNi-C-15 surfacing hardness HRC: ≥ 37 
 Description: The chrome-nickel alloy steel valves welding electrodes, the use of DCRP, deposited metal to rely on intensive silicon obtained ferrite plus austenite, aging time increased, hardness and abrasion resistance performance is further improved, with good anti-erosion, corrosion and oxidation resistance. 
 Uses: Used to work below 600 ℃ high pressure valve sealing surface of the surfacing.