RU2322527C1 - Cast iron - Google Patents

Abstract

FIELD: ferrous metallurgy.

SUBSTANCE: invention relates to cast iron compositions. Proposed cast iron comprises the following components, wt.-%: carbon, 2.2-2.7; silicon, 0.1-0.3; manganese, 0.6-1.2; chrome, 0.8-1.2; nickel, 3.8-4.2; copper, 1.0-1.5; molybdenum, 3.2-3.8; niobium, 1.0-1.5; cobalt, 3.8-4.2; aluminum, 0.1-0.2, and iron, the balance. Proposed cast iron shows high fragile strength and can be used in making articles exploited under conditions of mechanical and thermocyclic loads.

EFFECT: improved and valuable properties of cast iron.

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Description

The invention relates to the field of ferrous metallurgy, and in particular to compositions of cast iron, which can be used for the manufacture of products operated under mechanical and thermal cyclic loads.

Known cast iron, containing, wt.%: Carbon 1.5-4.0; silicon 0-1.5; manganese 0.05-1.5; chrome 0.02-1.5; copper 0.02-2.5; molybdenum and niobium ≤7.0; cobalt and nickel ≤5.0; aluminum 0.05-2.0; iron - the rest [1].

The objective of the invention is to increase the brittle strength of cast iron.

The technical result is achieved in that in cast iron containing carbon, silicon, manganese, chromium, nickel, copper, molybdenum, niobium, cobalt, aluminum, iron, the components are in the following ratio, wt.%: Carbon 2.2-2.7 ; silicon 0.1-0.3; manganese 0.6-1.2; chrome 0.8-1.2; nickel 3.8-4.2; copper 1.0-1.5; molybdenum 3.2-3.8; niobium 1.0-1.5; cobalt 3.8-4.2; aluminum 0.1-0.2; iron is the rest.

The table shows the composition of cast iron.

Table Components Composition, wt.%: one 2 3 Carbon 2.2 2,5 2.7 Silicon 0.3 0.2 0.1 Manganese 1,2 0.9 0.6 Chromium 0.8 1,0 1,2 Nickel 4.2 4.0 3.8 Copper 1,0 1.3 1,5 Molybdenum 3.2 3.4 3.8 Niobium 1,5 1,2 1,0

Table continuation Components Composition, wt.%: one 2 3 Cobalt 3.8 4.0 4.2 Aluminum 0.2 0.15 0.1 Iron rest rest rest Durability of cast iron after 100 heat shifts
(heating to 750 ° С - cooling to 20 ° С in air), MPa ~ 900 ~ 900 ~ 900

The components present in the composition of cast iron manifest themselves as follows.

Molybdenum and niobium strengthen the solid solution. Cobalt and nickel improve the metal base of the alloy. Nickel prevents bleaching. Copper promotes graphitization and increases the content of perlite in the alloy. Chrome stabilizes carbides. Aluminum acts as a deoxidizing agent, contributes to the production of an alloy with a fine-grained structure.

Cast iron is smelted in electric furnaces and cast in sand forms. Castings are subjected to normalization at a temperature of 900-950 ° C and tempering at a temperature of 350-450 ° C.

Information sources

1. DE 10 2004 010 916 A1, C22C 37/10, 2005.

Claims (1)

Cast iron containing carbon, silicon, manganese, chromium, nickel, copper, molybdenum, niobium, cobalt, aluminum and iron, characterized in that it contains components in the following ratio, wt.%: carbon 2.2-2.7 silicon 0.1-0.3 manganese 0.6-1.2 chromium 0.8-1.2 nickel 3.8-4.2 copper 1.0-1.5 molybdenum 3.2-3.8 niobium 1.0-1.5 cobalt 3.8-4.2 aluminum 0.1-0.2 iron rest