RU2529342C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: cast iron contains the following substances, wt %: carbon - 3.0-3.6, silicon - 3.0-3.6, manganese - 0.4-0.6, molybdenum - 0.15-0.25, magnesium - 0.002-0.003, cerium - 0.13-0.15, phosphorus - 0.2-0.3, barium - 0.002-0.003, silver - 0.002-0.003, iron making the rest.

EFFECT: higher heat resistance of cast iron.

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Description

The invention relates to the field of ferrous metallurgy, in particular to compositions of cast iron, which can be used for the manufacture of parts of thermal units, furnaces.

Known cast iron of the following composition, wt.%: Carbon 3.0-3.8; silicon 3.0-3.5; manganese 0.1-0.6; molybdenum 0.1-0.2; magnesium 0.03-0.08; copper 0.2-0.6; cerium 0.05-0.1; iron - the rest [1].

The objective of the invention is to increase the heat resistance of cast iron.

The technical result is achieved by the fact that cast iron containing carbon, silicon, manganese, molybdenum, magnesium, cerium, iron, additionally contains phosphorus, barium, silver, in the following ratio of components, wt.%: Carbon 3.0-3.6; silicon 3.0-3.6; manganese, 0.4-0.6; molybdenum 0.15-0.25; magnesium 0.002-0.003; cerium 0.13-0.15; phosphorus 0.2-0.3; barium 0.002-0.003; silver 0.002-0.003; iron is the rest. The table shows the composition of cast iron.

Table Components Composition, wt.%: one 2 3 Carbon 3.0 3.3 3.6 Silicon 3.0 3.3 3.6 Manganese 0.6 0.5 0.4 Molybdenum 0.25 0.2 0.15 Magnesium 0.002 0.0025 0.003 Cerium 0.13 0.14 0.15 Phosphorus 0.3 0.25 0.2 Barium 0.003 0.0025 0.002 Silver 0.002 0.0025 0.003 Iron rest rest rest Heat resistance of cast iron (heating to 850 ° C - cooling to 20 ° C), cycles until cracks appear. ~ 250 ~ 250 ~ 250

In the composition of cast iron, the components manifest themselves as follows. Molybdenum and phosphorus increase the strength characteristics of the alloy, increase its hardness. Molybdenum makes the alloy heat-resistant, increases the load-bearing capacity of parts under shock loads and high temperatures. Cerium and barium serve as deoxidizing agents; cerium neutralizes the influence of sulfur impurities. Silver slightly prevents the occurrence of cracks at temperature extremes.

Cast iron is smelted in electric furnaces and cast into molds. The castings are annealed at a temperature of 720-740 ° C, followed by cooling in air.

Information sources

1. SU 981428, C22C 37/10, 1982.

Claims (1)

Cast iron containing carbon, silicon, manganese, molybdenum, magnesium, cerium, iron, characterized in that it additionally contains phosphorus, barium, silver, in the following ratio of components, wt.%: Carbon 3.0-3.6; silicon 3.0-3.6; manganese 0.4-0.6; molybdenum 0.15-0.25; magnesium 0.002-0.003; cerium 0.13-0.15; phosphorus 0.2-0.3; barium 0.002-0.003; silver 0.002-0.003; iron is the rest.