RD-258
Special welding wire for coal mill rollers/grinding discs, the material contains chromium carbide after welding, with excellent wear resistance.
RD-258
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Special welding wire for coal mill rollers/grinding discs, the material contains Iron-based molybdenum-containing, high-carbon, high-chromium wear-resistant alloy , with excellent wear resistance.
| The post-weld material is a molybdenum-containing composite carbide alloy material with excellent wear resistance, medium impact resistance, and strong resistance to spalling; the post-weld material is not suitable for flame cutting, cannot be machined, and has fine stress cracks on the surface. | |
| 1.Microstructure: Austenitic chromium-manganese steel；Alloy Type：C-Cr-Mo-Fe | 2.Processing performance: only support sanding |
| 3.Cutting performance: does not support flame cutting | 4.Surfacing thickness: supports multi-layer surfacing，Overlay thicknesses up to 30-50 mm |
| Ideally suited for hardfacing parts subjected to a high degree of wear and general impact. Examples: coal mill rolls, grinding discs and other wear-resistant layer applications. The application temperature range does not exceed 550°C. |
| C | Cr | Mn | Si | P | S | Ni | Mo | Nb | W | Others |
| 4.0-6.0% | 26-30% | 0.5-2.0% | 0.5-2.2% | ≤0.04% | ≤0.04% | / | 0.5-1.5% | / | / | ≤2.0% |
| HRC 58-63 | 125/150/250 KG/Barrel |
| Wire Diameter | Current | Voltage | Wire Stick-out Length |
| 2.4/2.8/3.2mm | 250-430A | 27-32V | 25-40mm |
1. When using RD-258 wire, do not use inert gas, and take care to control the current and voltage according to the recommended overlay welding parameters. 2. The overlay layer will have normal fine stress relief cracks, which will help to prevent the occurrence of large-scale spalling of the overlay layer. 3. Before surfacing, please pay attention to removing ash, oil, rust and corrosion in the area to be welded. 4. Oscillating and linear welding are available, can be overlaid with multiple layers, the performance of the alloy layer is related to the dilution rate of the overlaid welding. 5. Preheating can reduce stress cracks. |
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