RD-238
Special welding wire for coal mill rollers/grinding discs, the material contains chromium carbide after welding, with excellent wear resistance.
RD-238
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Special welding wire for coal mill rollers/grinding discs, the material contains chromium carbide after welding, with excellent wear resistance.
| The post-weld material is an extremely tough, crack-resistant cladding material with high extrusion stress, austenitic in nature, and characterized by hardening (work hardening) when impacted. | |
| 1.Microstructure: Austenitic chromium-manganese steel；Alloy Type：C-Cr-Mn-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 8-16 mm |
| Excellent for hardfacing parts subject to high wear and general impact. Particularly suitable for new production and overlay repair of coal mill rolls and grinding discs, as well as high wear-resistant surfaces such as extrusion roll patterns, grinding roll surfaces and pulverizer rolls. The application temperature range does not exceed 500℃. |
| C | Cr | Mn | Si | P | S | Ni | Mo | Nb | W | Others |
| 3.0-5.5% | 25-30% | 0.5-2.0% | 0.5-2.2% | ≤0.04% | ≤0.04% | / | / | / | / | ≤2.0% |
| HRC 55-60 | 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-238 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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：RD-258