D227 in line with GB / T 984 EDPCrMoV-A2-15 Description: D227 is a low hydrogen sodium type coating of welding electrodes, DC reverse, surfacing layer is martensitic matrix by adding a certain number of high hardness carbide, wear higher grain and wear properties, deposited metal has good crack resistance. Uses: Can be used to withstand a certain amount of impact load surfacing wear-resistant parts, such as by grinding surface TBM disc cutter. Deposited metal chemical composition (%) C Cr Mo V guarantee 0.45 to 0.65 4.00 to 5.00 2.00 to 3.00 4.00 to 5.00 0.50 4.53 2.47 4.50 Example values ??are surfacing layer hardness: HRC≥55 Reference Current (DC +) Electrode Diameter (mm) f3.2 f4.0 f5.0 welding current (A) 90 ~ 110 140 ~ 180 180 ~ 220 Note: 1. Welding electrodes shall be subject to 300 ~ 350 ℃ baking 1h. 2. Before welding large parts should be properly preheated to about 300 ℃, and welding parts of the surface rust and oil are removed.