SU732400A1 - Cast iron - Google Patents

Description

(54) CAST IRON

I

The invention relates to metallurgy, in particular, to finding chugues for thin-walled castings, and can be used in the production of castings from liquid blast furnace hot melt of the first melting and curd blast furnace secondary iron.

Known cast iron of the following chemical composition, wt.%:

Carbon 2.8-4, O

Silicon1.5-2.6

Manganese 0.2-1.2

Alk Lines O, O6-O, 6

Calcium O4-O, 1

CeriOO, O1-O, 05

Iron Else 1.

This cast iron is the largest. close to the proposed technical essence and the achieved result.

The disadvantage of the known cast iron is not enough high density and strength of castings.

The purpose of the invention is to increase the density and strength of castings. To achieve this goal, cast iron containing carbon, silicon, manganese, aluminum, calcium and rare earth metals, additionally contains magnesium and yttrium, in the following ratio of components, wt.%:

3.3-4.3

Carbon 1.2-2.6

Silicon 0.1-1.7

Manganese Oh, 05-2.0

Aluminum 0.01-0.2

Calcium Red-earth0, 01-0.9 metals 0, OO4-0, O7 Magnesium 0.002-0.1 Yttrium

The rest of the iron. Table 1 shows the chemical composition of the proposed and well-known iron, table 2 - mechanical properties and structure.

3732400

The chemical composition of cast iron, weight. % 13.3 1,2OD 0.05 O, O1 23.8 1.90.91, O O, 1 3 (proposed, 7 2.0 O, 2 nd) 4.3 2.6

1.0 0.1

3.8 1.9

0.9

Mechanical properties

Content of harmful trace metals of non-ferrous metals, weight,%

Oh, O2

7.1

Density,

Strength - when stretching, kg / mm

21

4 T a b i c a 1

Oh o5

Table 2

0,007

0,0090, O25

7.24

7.25

7.08

5O

18

Claims (1)

32 0.01 0.002 0.004 Balance 0.45 0.05 O, 035 Same as 0; 9 0.1 O, 07 573 As it follows from Table 1 and 2, the proposed cast iron is characterized by significantly higher properties than non-yttrium-free cast iron. Magnesium: Density is 10-25% higher, durability - 15-8O%, which is due to the low content of harmful micro-samples, favorable form of graphite inclusions and small base structure. Claims: Cast iron containing carbon, silicon, manganese, aluminum, calcium and rare earth metals, different. By the fact that, in order to increase the density and strength of castings, it additionally contains magnesium and yttrium, with a relative ratio of the components. .%: Carbon 3.3-4.3 Silicon 1.2-2.6 Manganese 0.1-1.7 Aluminum O, O5-2, O Calcium 0.01-07 Rare-earth 0.01-0.9 metals Magnesium 0.004-0.07 Yttrium 0.002-0.1 Iron Else Sources of information that have been taken into account under 1. USSR author's certificate 592864, cl. C 22 C 37/10, 1975 ootype).