IRON-BASED CASTING ALLOY Russian patent published in 2024 - IPC C22C38/08 C22C38/10 C22C38/12 

FIELD: metallurgy.

SUBSTANCE: invention relates to cast iron-based Invar alloys, which have a low temperature coefficient of thermal expansion, and are used for the manufacture of parts with high dimensional stability in precision engineering products, for example, electronic devices, aircraft, predominantly operating in contact with non-metals such as glass ceramics, quartz glass, ceramics. The alloy contains components in the following ratio, wt.%: nickel from more than 32.6 to 36.5, cobalt 11.0 or less, niobium from more than 0.2 to 0.7, molybdenum 0.05-0.4, one component selected from cerium, lanthanum or yttrium 0.03-0.15, one component selected from calcium, strontium or barium 0.003-0.006, iron and impurities - the rest, with impurities in an amount of 0-0.3.

EFFECT: required values of the temperature coefficient of thermal expansion are provided in a wide temperature range while maintaining the required level of casting properties and reducing the content of rare earth metals.

1 cl, 1 tbl