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- Hardcarb MM55
Hardcarb MM55
Iron base hardfacing alloy suitable for hardfacing and rebuilding components subject to metal-to-metal adhesive wear, high abrasion, high impact and compressive stresses. The weld deposit is martensitic with considerable retained austenite. Suitable for deposits on mild steel, steel castings and manganese steel.
Weld deposit characteristics:
The tough martensitic weld metal is designed to give an outstanding resistance to low stress abrasion with heavy impact and high compressive stresses. The deposit is heat treatable and forgeable.
The weld deposit is magnetic and cannot be machined. Stress-relief cracks are normal and can be minimized by use of suitable preheat.
Recommended uses and applications
» cane cutting knives
» bamboo chipper knives
» metal cutting and forming tools
» mining and earth-moving equipment
» cold trimming and cutting dies
» crusher hammers
» dipper teeth, bucket teeth
» conveyor screws
» tool-joints
Additional info
Anti-wear suitability
| Metal-to-Metal friction Metal surfaces in relative motion forced into contact with or without lubricant. Degradation by the formation of micro-welds between the contacting surfaces. | Highly suitable |
| High pressure abrasion Wear by relative movement under pressure of mineral particles of suitable hardness, shape and texture to remove material from the metal surface, leaving superficial deformation. | Suitable |
| Cavitation Tearing out of grains from the metal surface by the formation and implosion of bubbles in a liquid in rapid motion. | - |
| Mechanical fatigue Fatigue and formation of cracks in surface regions due to tribological stress cycles that result in the separation of material. | - |
| Thermal fatigue Cyclic exposure to high temperatures leading to permanent deformation by alternate expansion and contraction. Alteration of the structure and properties of the material. | - |
| Hot oxidation Creation of a poorly adhering oxide layer that reforms constantly. Degradation by loss of material thickness. | - |
Workability
| Work hardening Work hardening is the process of making a metal harder and stronger through plastic deformation. When a metal is plastically deformed, dislocations move and additional dislocations are generated. | |
| Edge retention Suitability for creating sharp edges and retaining them during operation. | |
| Machining Machinability is the ease with which a metal can be cut (machined) permitting the removal of the material with a satisfactory finish at low cost. | Not possible. Only grinding possible. |
