RU2494164C1 - Cast iron - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: proposed composition contains the following substances, in wt %: carbon - 3.0-3.5, silicon - 0.5-0.9, manganese - 0.5-0.9, molybdenum - 0.7-0.9, stibium - 0.02-0.03, hafnium - 1.1-1.5, boron - 0.02-0.03, iron making the rest.

EFFECT: higher strength.

1 tbl

Description

The invention relates to the field of metallurgy, in particular to compositions of cast iron, which can be used in mechanical engineering.

Known cast iron, containing, wt.%: Carbon 3.0-3.4; silicon 1.6-2.2; manganese 0.005-0.04; vanadium 0.05-0.14; molybdenum 0.1-0.4, antimony 0.05-0.1; graphene 0.14-0.27, iron - the rest [1].

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

The technical result is achieved by the fact that cast iron containing carbon, silicon, manganese, molybdenum, antimony, hafnium, iron, additionally includes boron, and the components are in the following ratio, wt.%: Carbon 3.0-3.5; silicon 0.5-0.9; manganese 0.5-0.9; molybdenum 0.7-0.9; - antimony 0.02-0.03; hafnium 1.1-1.5; boron 0.02-0.03; iron is the rest.

The table shows the composition of cast iron.

Components Content, wt.% In the compositions one 2 3 Carbon 3,5 3.3 3.0 Silicon 0.9 0.7 0.5 Manganese 0.9 0.7 0.5 Molybdenum 0.7 0.8 0.9 Antimony 0.02 0,025 0,03 1 aphni 1,5 1.3 1,1 Boron 0,03 0,025 0.02 Iron rest rest rest Tensile Strength, MPa ~ 800 ~ 800 ~ 800

The increase in the strength of cast iron is due to the complex effect of the components that make up its composition. Manganese provides increased hardness of cast iron. Molybdenum and hafnium increase the strength of cast iron. Antimony promotes the formation of a fine-grained structure of the alloy, increases hardness. Boron stabilizes carbides, increases the hardness and strength of the alloy

Cast iron is smelted in electric furnaces and cast into hot (~ 400 ° C) metal molds coated with refractory clay. The castings are subjected to normalization at a temperature of 900-950 ° C and tempering at a temperature of 350-450 ° C.

Information sources

1. SU 1359327, C22C 37/00, 1986.

Claims (1)

Cast iron containing carbon, silicon, manganese, molybdenum, antimony, hafnium, iron, characterized in that it additionally contains boron in the following ratio of components, wt.%: Carbon 3.0-3.5; silicon 0.5-0.9; manganese 0.5-0.9; molybdenum 0.7-0.9; antimony 0.02-0.03; hafnium 1.1-1.5; boron 0.02-0.03; iron is the rest.