IRON-BASED CASTING ALLOY Russian patent published in 2021 - IPC C22C38/12 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to iron-based casting precision alloys used for manufacturing parts with high dimensional stability in precision equipment, e.g., electronic apparatuses, aircrafts, primarily working in contact with non-metals, such as sitalls, quartz glass, ceramics. The alloy comprises nickel, cobalt, niobium, carbon, iron and impurities at the following ratio of components, wt.%: nickel 31.5 to 34.5, cobalt 4.0 to 5.5, niobium 0.55 to 1.2, carbon up to 0.35, iron and impurities the rest. As impurities, the alloy comprises chromium, manganese and silicon in an amount not exceeding 0.3 wt.% of each.

EFFECT: reduction in the value of the thermal coefficient of linear expansion is achieved ensuring the maintained stability of operational characteristics in the temperature range from minus 100 to +300°C, and the level of crack resistance and machinability sufficient for manufacturing castings by the shaped casting method are achieved.

2 cl, 2 tbl