D512 valve welding electrodes meet the GB EDCr-B-03 
 Description: D512 titanium calcium type of valve welding electrode 2Cr13, DC and AC welding technology is good. Surfacing metal is 2Cr13 martensitic high chromium steel. Surfacing with air quenching properties, generally do not need heat treatment, uniform hardness, softening annealing at 750-800 ℃, when heated to 950-1000 ℃ air-cooled or oil quenched re-hardening. 

 Uses: D512 is a versatile surfacing electrode surface, surfacing layer harder than the D502, more wear and difficult to process for welding carbon steel or low alloy steel shaft, superheated steam valves, mixers paddle, screw conveyor blades. 

 Chemical Composition of Deposited Metal (%) chemical composition of other elements of total C Cr 
 Guaranteed value ≤ 0.25 10.0 ~ 16.0 ≤ 5.00 

 Surfacing layer hardness: (welding followed by air cooling) HRC ≥ 45 (softening resistance to 500 ℃) 
 Reference current (AC, DC) electrode diameter (mm) φ3.2 φ4.0 φ5.0 
 Welding current (A) 80 ~ 120 120 ~ 160 170 ~ 210 

 Note: 
 1. 150 ℃ before welding electrodes shall be baked 1h. 
 2. Preheating before welding the workpiece to be above 300 ℃ for different post-weld heat treatment such as the availability of appropriate hardness.