D577 valve welding electrodes meet the GB EDCrMn-C-15 
 Description: D577 is a low hydrogen sodium type coating, the Cr-Mn alloy valve core welding electrodes. DC reverse, deposited metal manganese austenitic high chromium steel, so the work hardening effect is remarkable, with a good anti-abrasion performance, in a certain temperature and hardness, good thermal stability, such as cooperation with the D507Mo use, get good anti-abrasion performance, good crack resistance of the electrodes, welding process is simple, do not preheat welding, weld without heat treatment, welding metal cutting performance is good. 

 Uses: used in welding temperature below 510 ℃ in temperature and pressure valve sealing surface, such as in the valve in conjunction with the D507Mo, life higher. 

 Chemical Composition of Deposited Metal (%) Chemical Composition C Mn Si Ni Mo Cr total amount of other elements 
 Guaranteed value ≤ 1.10 12.0 ~ 18.0 ≤ 2.00 ≤ 6.00 ≤ 4.00 12.0 ~ 18.0 ≤ 3.00 

 Surfacing layer hardness: HRC ≥ 28 
 Reference Current (DC +) electrode diameter (mm) φ3.2 φ4.0 φ5.0 
 Welding current (A) 80 ~ 120 120 ~ 160 160 ~ 200 

 Note: 
 1. 300-350 ℃ before welding electrodes shall be baked 1h. 
 2. Deposited metal after processing more than 5mm height should be to ensure uniform chemical composition and hardness.