Chemical components

Product Description

RCoCr-A 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, 3-5% tungsten, 1.0-2.0% carbon, and the balance cobalt (approximately 60-65%). This composition creates a carbide-strengthened matrix with excellent high-temperature strength, hot hardness, and corrosion resistance. Designed for gas tungsten arc welding (GTAW/TIG) and gas metal arc welding (GMAW/MIG), it produces as-welded hardness of 40-45 HRC (approximately 370-420 HB), capable of maintaining hardness at elevated temperatures up to 800°C (1472°F). The cobalt-base alloy offers exceptional resistance to thermal shock, oxidation, and galling in high-temperature service environments.

Features

▪ Exceptional High-Temperature Properties: Maintains hardness and strength at temperatures up to 800°C, making it ideal for hot working dies and high-temperature components requiring dimensional stability.
▪ Carbide Strengthening: The chromium carbides formed by the 30% chromium content and 1.0-2.0% carbon provide excellent wear resistance and hot hardness in severe service conditions.
▪ Thermal Shock Resistance: The cobalt matrix provides outstanding resistance to thermal cycling and thermal shock, preventing crack formation during rapid temperature changes.
▪ Excellent Corrosion Resistance: The high chromium content and cobalt base provide superior resistance to oxidation, corrosion, and galling in aggressive chemical and high-temperature environments.
▪ Clean Weld Deposits: 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

▪ Widely used for hardfacing and surfacing components subjected to high temperatures, severe wear, and corrosive environments, RCoCr-A is commonly applied in:
▪ Hot Working Dies: Die casting dies, forging dies, hot working tools, and extrusion dies requiring high-temperature hardness and thermal shock resistance.
▪ Aerospace & Turbine: Turbine blades, valve seats, and aerospace engine components requiring excellent high-temperature strength and oxidation resistance.
▪ Industrial Valves: Valve seats, valve trim, and valve components in high-temperature service requiring resistance to corrosion, galling, and wear.
▪ Metal Processing: Hot shear blades, hot strip mill guides, and metal processing equipment operating at elevated temperatures with severe wear conditions.
▪ Chemical Processing: Pump shafts, agitator blades, and chemical processing equipment requiring corrosion resistance and wear resistance in aggressive environments.