D397 in line with GB / T 984 EDRCrMnMo-15 Description: D397 is a low hydrogen sodium type coating CrMnMo forging welding electrodes, DC reverse. Cladding layer martensite + retained austenite, having between metal wear and abrasion resistant properties. Purpose: forging die for the surfacing of cast or forged blank can also be used to repair 5CrMnMo, 5CrNiMo, 5CrNiSiW old forging die steel, or welding of high strength wear-resistant parts. Deposited metal chemical composition (%) C Mn Si Cr Mo SP guaranteed ≤0.60 ≤2.50 ≤1.00 ≤2.00 ≤1.00 ≤0.035 ≤0.04 cases 0.40 1.70 0.43 1.65 0.50 0.007 0.018 :( surfacing layer hardness after welding, air cooling) HRC ≥40 Reference Current (DC +) Electrode Diameter (mm) f3.2 f4.0 f5.0 welding current (A) 100 ~ 120 140 ~ 190 190 ~ 210 Note: 1. Welding electrodes shall be subject to about 300 ℃ baking 1h . 2. before welding workpieces preheated to 250 ℃, slow cooling after welding.