Hardcarb 6900
Tungsten carbide hardfacing superalloy for oxy-acetylene welding. The weld deposit possesses excellent abrasion, erosion and corrosion resistance. Perfectly suited for hardfacing of mixer blades, scrapers and screws in the ceramic, chemical and food industry; stabilizer blades and drilling heads in the petroleum industry; impellers of waste gas fans and hard facing on various ferritic and austenitic steels used in severe wear environments.
Weld deposit characteristics:
The weld metal consists of a NiCrBSi matrix (approx. 450 HV ) with embedded fused tungsten carbides. The extraordinary high hardness, toughness and volume of these tungsten carbides along with a nickel-chrome matrix ensures excellent abrasion, erosion and corrosion resistance. The hard facing is highly resistant to acids, bases, lye, and other corrosive media and severest of wear environments.
The electrode has excellent flow and wetting characteristics at a low welding temperature of approximately 1050 °C (1925 °F).
Recommended uses and applications
Typical applications:
» mixer blades, scrapers and screws in the ceramic, brick, chemical and food industry
» stabilizer blades and tools for oilfield equipment
» drilling head and tools for deep drilling equipment
» intensive mixer tools in foundry and steel industry
» screws in aluminum smelters and waste recycling industry
» hydro-pulper and reject sorter blades in paper industry
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. | 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. | Highly 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. |
