D502 in line with GB / T 984 EDCr-A1-03 Description: D502 titanium calcium type skin 1Cr13 valve welding electrodes can be AC ??and DC, good welding process. Welding metal is 1Cr13 half ferritic high chromium steel. Surfacing with air quenching properties, generally not be heat-treated, uniform hardness, can be annealed at 750 ~ 800 ℃ soften when heated to 900 ~ 1000 ℃ air cooling or oil quenching re-hardening. Purpose: This is a versatile surfacing welding rod for welding temperature below 450 ℃, carbon steel or alloy steel shafts and valves. Deposited metal chemical composition (%) C Cr SP other elements of total guaranteed value ≤0.15 10.00 ~ 16.00 ≤0.030 ≤0.040 ≤2.50 Example value 0.15 11.20 0.008 0.024 - :( surfacing layer hardness after welding, air-cooled) HRC≥40 reference current (AC, DC) electrode diameter (mm) f2.5 f3.2 f4.0 f5.0 welding current (A) 50 ~ 80 80 ~ 120 120 ~ 160 160 ~ 200 Note: 1. Welding electrodes shall be subject about 150 ℃ baking 1h. 2. before welding workpieces preheated to 300 ℃, different heat treatment after welding gets the appropriate hardness.