D632A High Chromium Iron Surfacing Electrode High Chromium Alloy Wear-Resistant Electrode Description: The D628 high chromium iron surfacing electrode is a graphite-coated, wear-resistant, high-carbon, high-chromium iron surfacing electrode designed for abrasive wear resistance. The surfacing layer consists of a high-carbon, high-chromium iron type with dispersed carbides, offering high hardness and good thermal strength. However, the surfacing layer is hard and brittle, with limited ability to withstand pressure and impact loads. To avoid compromising the abrasive wear resistance of the surfacing layer, use the smallest possible current to facilitate the alignment of hard-phase crystals in the surfacing layer. Application: The D628 high chromium iron surfacing electrode is used for surfacing wear-resistant surfaces that are subject to slight impact loads but require excellent resistance to abrasive wear. Examples include hammer heads for hammer mills and impact plates for fan mills. Deposited Metal Chemical Composition (%) C Cr Mo V Guaranteed Value 3.00~5.00 11.00~20.00 1.00~4.00 ≤1.00 Example Value 4.65 15.00 1.74 0.32 Surfacing Layer Hardness: HRC≥60 Reference Current (DC+) Electrode Diameter (mm) φ3.2 φ4.0 φ5.0 Welding Current (A) 90~140 130~180 160~210 Precautions: 1. The electrode must be baked at 250°C for 1 hour before use. 2. Preheat the workpiece to 400~600°C before surfacing, and ensure that rust, oil, and other contaminants are thoroughly removed. 3. The length of each surfacing pass should preferably not exceed 50~70mm. 4. After welding, the workpiece should be tempered at 600~700°C for 1 hour and then cooled slowly, or immediately placed in a dry and preheated sandbox or straw ash for slow cooling.