D507 valve hardfacing electrodes meet the GB EDCr-A1-15 
 Description: D507 is a low hydrogen sodium type coating 1Cr13 valve welding electrode, the use of DCRP. 1Cr13 half surfacing metal is ferritic high chromium steel. Surfacing with air quenching properties, generally not be heat-treated, uniform hardness, can also be annealed at 750-800 ℃ to soften, when heated to 900-1000 ℃ air-cooled or oil quenched, re-hardening. 
 Uses: This is a versatile surfacing the surface of electrode for welding temperature below 450 ℃, carbon steel or alloy steel shafts and valves. 
 Chemical Composition of Deposited Metal (%) chemical composition of other elements of total CSP Cr 
 Guaranteed value ≤ 0.15 ≤ 0.030 ≤ 0.040 10.0 ~ 16.0 ≤ 2.50 
 Surfacing layer hardness: (welding followed by air cooling) HRC ≥ 40 
 Reference Current (DC) electrode diameter (mm) φ2.5 φ3.2 φ4.0 φ5.0 
 Welding current (A) 50 ~ 80 80 ~ 120 120 ~ 160 160 ~ 200 
 Note: 
 1. Welding electrodes shall be subject prior to baking about 300-350 ℃ 1h. 
 2. Preheating before welding the workpiece to be above 300 ℃ heat treatment after welding to obtain the corresponding different hardness.