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Improved Corrosion and Wear Resistance of a Niobium Alloyed Co-Cr-Mo Alloy

Picture for Improved Corrosion and Wear Resistance of a Niobium Alloyed Co-Cr-Mo Alloy
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Product Number: 51315-5960-SG
ISBN: 5960 2015 CP
Author: Matthew Yao
Publication Date: 2015
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Co-Cr-W alloys such as Stellite 6 (UNS R30006) have long been served in various industries for high-temperature corrosion and wear applications. The Co-Cr-Mo alloys are developed to meet the market requirements for improved corrosion resistance with similar wear resistance as of Co-Cr-W alloys especially for oil and gas and power generation industries.The corrosion and wear resistance of a Nb (niobium) alloyed Stellite 728 alloy is studied in this work. In addition Stellite 6 (UNS R30006) and Stellite 21 (UNS R30021) are chosen to be compared with. According to ASTM G59 potentiodynamic polarization test is conducted in three different electrolytes - 10% H2SO4 (215 ) 5% HCl (150 ) and 65% HNO3 (150 ). The immersion test is dealt within the same conditions as well by following ASTM G31. Furthermore the critical pitting temperatures of these alloys are detected in three solutions. Wear testing is conducted according to ASTM G65 (abrasion) ASTM G98 (galling) ASTM G76 (erosion) and ASTM G99 (metal on metal wear). This work provides an advanced Nb alloyed Co-Cr-Mo alloy which possesses improved corrosion resistance compared to Stellite 6 with similar wear properties and improved wear resistance compared to Stellite 21 with similar corrosion properties.
Co-Cr-W alloys such as Stellite 6 (UNS R30006) have long been served in various industries for high-temperature corrosion and wear applications. The Co-Cr-Mo alloys are developed to meet the market requirements for improved corrosion resistance with similar wear resistance as of Co-Cr-W alloys especially for oil and gas and power generation industries.The corrosion and wear resistance of a Nb (niobium) alloyed Stellite 728 alloy is studied in this work. In addition Stellite 6 (UNS R30006) and Stellite 21 (UNS R30021) are chosen to be compared with. According to ASTM G59 potentiodynamic polarization test is conducted in three different electrolytes - 10% H2SO4 (215 ) 5% HCl (150 ) and 65% HNO3 (150 ). The immersion test is dealt within the same conditions as well by following ASTM G31. Furthermore the critical pitting temperatures of these alloys are detected in three solutions. Wear testing is conducted according to ASTM G65 (abrasion) ASTM G98 (galling) ASTM G76 (erosion) and ASTM G99 (metal on metal wear). This work provides an advanced Nb alloyed Co-Cr-Mo alloy which possesses improved corrosion resistance compared to Stellite 6 with similar wear properties and improved wear resistance compared to Stellite 21 with similar corrosion properties.
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