D256 in line with GB / T 984 EDMn-A-16 rather AWS A5.13 EFeMn-A Description: D256 is a low hydrogen potassium type coating of high manganese steel welding electrodes, when AC and DC (AC welding, the no-load voltage not less than 70V), surfacing should be used when a small current, narrow weld, while hammering the red hot or water quenched immediately to reduce the crack tendency. Surfacing metal is austenitic high manganese steel, with hardening, tough and wear-resistant characteristics. Uses: Suitable for easy wear parts of the surfacing of various crushers, high manganese steel rail, fighting, bulldozers and the like. Deposited metal chemical composition (%) C Mn Si other elements of total guaranteed value ≤1.10 11.00 ~ 16.00 ≤1.30 ≤5.00 Example value 0.54 14.00 0.32 - Surfacing layer hardness: HB≥170 Reference current (AC, DC +) Electrode Diameter (mm) f3.2 f4.0 f5.0 welding current (A) 70 ~ 90 100 ~ 140 150 ~ 180 Note: 1. Welding electrodes shall be subject to 300 ~ 350 ℃ baking 1h. High manganese steel workpiece 2. surfacing worn, prior fatigue level should eliminate or toughening treatment with water or primed with chrome manganese steel electrode (eg D277). 3. surfacing large yellow smoke, should pay attention to increase ventilation and to stand upwind of operation.