RU2349670C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: cast iron contains components in a following ratio, wt %: carbon 3.0-3.8; silicon 0,8-1.0; manganese 5.5-6.5; nickel 1.6-2.0; titanium 0.1-0.2; niobium 0.2-0.3; tellurium 0.0001-0.0002; lead 0.003-0.007; nitrogen 0.003-0.005; selenium 0.003-0.008; iron - the rest.

EFFECT: increasing of cast iron hardness.

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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 in the production of tubing equipment.

Known cast iron, containing, wt.%: Carbon 1.7-3.8; silicon 0.01-2.5; manganese 0.01-1.0; nickel 0.01-5.0; titanium 0.01-0.15; niobium 0.01-0.1; tellurium 0.001-0.05; lead 0.001-0.2; iron - the rest [1].

The objective of the invention is to increase the hardness of cast iron.

The technical result is achieved by the fact that cast iron containing carbon, silicon, manganese, nickel, titanium, niobium, tellurium, lead, iron, additionally includes nitrogen and selenium in the following ratio of components, wt.%: Carbon 3.0-3.8; silicon 0.8-1.0; manganese 5.5-6.5; nickel 1.6-2.0; titanium 0.1-0.2; niobium 0.2-0.3; tellurium 0.0001-0.0002; lead 0.003-0.007; nitrogen 0.003-0.005; selenium 0.003-0.008, iron - the rest.

The table shows the composition of cast iron.

Table Components Composition, wt.%: one 2 3 Carbon 3.8 3.4 3.0 Silicon 1,0 0.9 0.8 Manganese 5.5 6.0 6.5 Nickel 2.0 1.8 1,6 Titanium 0.2 0.15 0.1 Niobium 0.3 0.25 0.2 Tellurium 0,0002 0.00015 0.0001 Lead 0.007 0.005 0.003 Nitrogen 0.005 0.004 0.003 Selenium 0.003 0.005 0.008 Iron rest rest rest Hardness HRC ~ 60 ~ 60 ~ 60

The components present in the composition of cast iron manifest themselves as follows. Manganese provides increased hardness of cast iron. Nickel improves the metal base of the alloy. Tellurium stabilizes carbides. Niobium and titanium form carbonitrides, which contribute to improving the mechanical properties of cast iron. Selenium and lead give a fine-grained alloy structure.

Cast iron is smelted in cupola furnaces and cast in sand forms. Castings are subjected to heat treatment at a temperature of 200-230 ° C.

Information sources

1. GB 1149401 A, 1969.

Claims (1)

Cast iron containing carbon, silicon, manganese, nickel, titanium, niobium, tellurium, lead, iron, characterized in that it additionally contains nitrogen and selenium in the following ratio of components, wt.%: Carbon 3.0-3.8; silicon 0.8-1.0; manganese 5.5-6.5; nickel 1.6-2.0; titanium 0.1-0.2; niobium 0.2-0.3; tellurium 0.0001-0.0002; lead 0.003-0.007; nitrogen 0.003-0.005; selenium 0.003-0.008; iron is the rest.