Cemented carbide with improved toughness for oil and gas applications

摘要

The present invention relates to cemented carbide with excellent properties for oil and gas applications regarding resistance to the combined erosion and corrosion synergistic effects at temperatures between -50 and 300°C and toughness. This object has been achieved with a cemented carbide containing, in wt-%, 8 - 12 Co+Ni with a weight ratio Co/Ni of 0.25-4, 1-2 Cr and 0.1-0.3 Mo wherein essentially all of the WC grains have a size 1 µm and with a magnetic cobalt content between 80 and 90 % of that chemically determined.