Chemical components

Product Description

RCoCr-C is a cobalt-base solid welding wire classified under AWS A5.21 specification, known commercially as Stellite® wire equivalent. The wire contains approximately 30% chromium, 8-12% tungsten, and 1.0-2.0% carbon, with the balance cobalt (approximately 55-60%). This composition creates a tungsten-strengthened matrix with exceptional red hardness and high-temperature strength. Designed for gas tungsten arc welding (GTAW/TIG) and gas metal arc welding (GMAW/MIG), it produces as-welded hardness of 40-48 HRC (approximately 380-450 HB), capable of maintaining hardness at elevated temperatures up to 850°C (1562°F). The higher tungsten content provides superior hot hardness and resistance to thermal softening compared to RCoCr-A and RCoCr-B.

Features

▪ Superior Red Hardness: The 8-12% tungsten content provides exceptional resistance to thermal softening, maintaining hardness at temperatures up to 850°C, higher than both RCoCr-A and RCoCr-B.
▪ Excellent High-Temperature Strength: Maintains mechanical properties and dimensional stability at elevated temperatures, making it ideal for hot working applications with extended thermal exposure.
▪ Balanced Carbide Formation: The moderate carbon content (1.0-2.0%) with 30% chromium provides good carbide strengthening for wear resistance while maintaining sufficient ductility for thermal shock resistance.
▪ Enhanced Oxidation Resistance: The cobalt-chromium-tungsten alloy composition provides excellent resistance to oxidation and scaling at high temperatures, protecting the base metal from degradation.
▪ Precision Welding Capability: The solid wire format provides clean, low-spatter weld deposits with excellent control using GTAW/TIG or GMAW/MIG processes, suitable for precision applications.

Applications

▪ Designed for applications requiring maximum high-temperature performance and red hardness, RCoCr-C is commonly applied in:
▪ Hot Working Tools: Hot working dies, forging dies, and extrusion tools requiring exceptional red hardness and resistance to thermal softening during prolonged high-temperature exposure.
▪ Turbine Components: Turbine blades, nozzle rings, and high-temperature turbine components requiring excellent high-temperature strength and oxidation resistance.
▪ Industrial Furnace Parts: Furnace rolls, conveyor belts, and furnace components operating at sustained high temperatures requiring resistance to thermal softening.
▪ Metal Processing: Hot strip mill rolls, hot working guides, and metal processing equipment requiring red hardness during high-temperature operations.
▪ Aerospace Engine Parts: Hot sections of turbine engines, exhaust components, and aerospace applications requiring excellent high-temperature properties and oxidation resistance.