RU2332501C1 - Iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to compositions of iron. Iron contains components at the following ratio, mass %: carbon 2.0-2.5; silicon 1.0-1.5; manganese 2.0-2.5; chromium 5.0-6.0; copper 1.5-2.0; aluminium 0.1-0.2; phosphorus 0.05-0.1; sulphur 0.05-0.1; titanium 0.1-0.2; molybdenum 0.4-0.8; nickel 0.8-1.2; zirconium 0.1-0.2; barium 0.05-0.1; niobium 0.2-0.4, the rest being iron.

EFFECT: upgraded wear resistance of iron.

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Description

The invention relates to the field of metallurgy and relates to compositions of cast iron, which can be used for the manufacture of rolling rolls.

Known cast iron, containing, wt.%: Carbon 2.5-4.0; silicon 0.8-2.5; manganese 0.3-1.5; chrome 0-1.5; copper 0-4.0; aluminum 0-0.2; phosphorus 0.05-1.5; sulfur 0-0.3; titanium 0-1.0; molybdenum 0-0.8; nickel 0-2.5; zirconium 0-1.0; barium 0-0.2; niobium 0-1.0; iron - the rest [1].

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

The technical result is achieved by the fact that in cast iron containing carbon, silicon, manganese, chromium, copper, aluminum, phosphorus, sulfur, titanium, molybdenum, nickel, zirconium, barium, niobium, iron, the components are in the following ratio, wt.%: carbon 2.0-2.5; silicon 1.0-1.5; manganese 2.0-2.5; chrome 5.0-6.0; copper 1.5-2.0; aluminum 0.1-0.2; phosphorus 0.05-0.1; sulfur 0.05-0.1; titanium 0.1-0.2; molybdenum 0.4-0.8; nickel 0.8-1.2, zirconium 0.1-0.2; barium 0.05-0.1; niobium 0.2-0.4; iron is the rest.

The table shows the composition of cast iron

Table Components Content, wt.% In the compositions one 2 3 Carbon 2.0 2,3 2,5 Silicon 1,5 1.3 1,0 Manganese 2,5 2,3 2.0 Chromium 5,0 5.5 6.0 Copper 2.0 1.7 1,5 Aluminum 0.1 0.15 0.2 Phosphorus 0.1 0,07 0.05 Sulfur 0.05 0,07 0.1 Titanium 0.2 0.15 0.1 Molybdenum 0.4 0.6 0.8 Nickel 1,2 1,0 0.8 Zirconium 0.1 0.15 0.2 Barium 0.1 0,07 0.05 Niobium 0.2 0.3 0.4 Iron rest rest rest Depreciation, unit ~ 0.85 ~ 0.85 ~ 0.85 Note: for 1 rel. dry friction wear of known cast iron [1] under specific pressure up to 100 kgf / cm ² , sliding speed up to 5.7 m / s, counterbody - gray cast iron modified (MSC 28-48) was adopted.

The increase in wear resistance of cast iron is due to the complex effect of the components that make up its composition. Chrome provides increased alloy hardness. Molybdenum and niobium strengthen the solid solution. Copper and nickel improve the metal base of the alloy, prevent the occurrence and development of cracks. Aluminum and barium split the cast iron. Titanium gives a fine grain structure to the alloy. Phosphorus forms a low-melting eutectic, its hard sections in the fine-grained material contribute to increased wear resistance. The combined presence of sulfur and zirconium in the composition of cast iron contributes to the formation of zirconium sulfides, which prevent the formation of burrs.

Cast iron is smelted in cupola furnaces, by a duplex process or in electric furnaces, and cast into hot (400-450 ° C) metal molds coated with refractory clay. The temperature of the melt when casting molds should be at least 1320 ° C. Castings are subjected to normalization at a temperature of 900-950 ° C and tempering at a temperature of 350-450 ° C.

The source of information

1. JP 60-121254, C22C 37/08, 1985.

Claims (1)

Cast iron containing carbon, silicon, manganese, chromium, copper, aluminum, phosphorus, sulfur, titanium, molybdenum, nickel, zirconium, barium, niobium, iron, characterized in that the components are contained in the following ratio, wt.%: Carbon 2, 0-2.5; silicon 1.0-1.5; manganese 2.0-2.5; chrome 5.0-6.0; copper 1.5-2.0; aluminum 0.1-0.2; phosphorus 0.05-0.1; sulfur 0.05-0.1; titanium 0.1-0.2; molybdenum 0.4-0.8; nickel 0.8-1.2; zirconium 0.1-0.2; barium 0.05-0.1; niobium 0.2-0.4; iron is the rest.