SU740854A1 - Modifier - Google Patents

Description

one

The invention relates to drinking production, in particular to the search for new formulations of modifiers used in the manufacture of articles of cast iron.

Known modifier for cast iron, content of 7-21% barium; 8-35% aluminum: 1O-21% calcium; up to 25% iron and manganese; silicon - optal

", ten

The use of this moai {1mcator for the treatment of cast iron, cast in a chill mold, does not provide high physical and mechanical properties in castings in combination with other performance characteristics, in particular, with high antifriction properties.

The closest to the proposed invention in terms of composition and technical essence is a complex modification - JQ fop of the following composition, wt.%:

Silicon55-85

Carbon 0.2 -1.0

Aluminum up to 2

Calcium2-5

Iron Else fz.

When modifying cast iron with this modifier in an amount of 2% О% by weight of the liquid metal, cast iron with a tensile strength of 23- is obtained. 25 kg / mm and an elongation of 2.9-3.1%.

The disadvantage of this modifier is that in the manufacture of cast iron castings using metal molds as mold molds, the presence of structurally free cementite is observed, which is not allowed for wear castings, for example, tractor engine liners. In addition, the absence in the modifier of elements stabilizing the perlite of the metal matrix, such as copper or nickel, as well as strong graphitizers does not allow to obtain castings that are cast in metal molds with high resistance to wear. 3,740,854 The aim of the invention is to improve the structure and enhance the strength and antifriction properties of cast iron. The goal is achieved by the fact that the modifier, the contents of cronal, carbon, aluminum, calcium, and iron, additionally contains copper, barium and strontium in the following ratio of components, wt.%; Silicon45.0-65.0 Copper10.0-25.0 Us 10 You Barium 0.5-6.0 Strontium 0.5-7.0 Carbon 0.2-4.0 Aluminum 2.5-6.5 Calcium 0, 1-5.0 Iron Else In the laboratory and pilot industrial ovi s, the modifiers listed in Table 2 are smelted and tested. 1, Table 1

10 25 11.2

0.5

45

6.0 65

0.67 46.2

3.6 50.2

14.7

5.8 54.3 19.2

3.2 57.4 24.3

0.62 64.3 16.1 58 73

The effectiveness of the modifiers was tested on base iron, containing, wt.%: Carbon 3.24; silicon 1.22; manganese 0, chromium 0.25; nickel O, 07; phosphorus 0.11; sulfur 0.05. The cast iron is melted in an induction furnace with a capacity of 30 kg. The temperature of the cast iron during the modification of 1350-14OO C. Modification is carried out by immersing the modifier on the bottom of the ladle before releasing

3.2 31.1 3.2 30.1 3.3 30, O 3.3

3.3 29.8

0.1

7.0

6.5

Rest

0.2 2.5

5.0 Same Oh 5

4.0

1.21 1.43, 3 6.42 2.21 5.53

2.43, 8 0.38

0.64 4.41, 72 3.54 3.63

0.32, 41 4.73

3.96 2.81, 8

0.54 0.57 0.37

0.84 0.86 1.72

guna from the stove. The amount of modifier 2, O% by weight of liquid iron. To study the structure and mechanical properties of cast iron, samples with a diameter of 5,10,30,60 and 12О mm are cast.

The mechanical properties and structure of the cast irons modified by the modifier compositions under test are listed in Table. 2

-Table 2,

P, GdZ, Gd4

220 220 P95, GdZ, Gd4 225 P, Gd Gd4 225 P, Gd4 230 P. Gd4

The microstructure of cast iron in the samples with a diameter of 5,10,30,6O and 12O mm is pearlitic with up to 5% ferrite, without 20 traces of structurally free cementite. ,

Verification of the proposed modifier shows its greater efficiency in obtaining iron compared with the known modifier. Thus, the tensile strength of 25 cast iron pr) is increased by 6.1 kg / mm; deflection arrow - O, 55mM; relative wear resistance - by ZOR - 45%; hardness - 20-30 IB. At the same time, the size of inclusions of graphite of modified 30 nog iron by the proposed modifier is reduced by 25-30 microns.

The described modifier can be used to produce high-quality castings manufactured by pouring metal into metal molds. Formulas of the invention

A modifier containing silicon, carbon, aluminum, calcium, and iron, from the Continuation Table. 2

Having a leak that, with a chain of improving the structure, improving the strength and anti-friction properties of cast iron, it additionally contains copper, barium and strontium in the following ratio of components, wt.%:

45.0-65.0

Silicon 10.0-25.0 Copper 0.5 -6.0 Bar ry 0.5-7.0 Strontium 0.2-4.0 Carbon 2.5-6.5 Aluminum 0.1-5.0 Calcium The rest of the iron

Sources of information taken into account in the examination

1. Durrer R. and Volkert G. Metappurgi ferroalloys. Moscow, Metallurgists, 1976, p. 2O.

2. US patent N 3765875, cl. 75-130, 1974.

Claims (2)

Claim A modifier containing silicon, carbon, aluminum, calcium and iron, characterized in that, with a chain for improving the structure and increasing the strength and antifriction properties of cast iron, it additionally contains copper, barium and strontium in the following ratio of components, wt.%: Silicon 45.0-65.0 Copper 10.0-25.0 Barium 0.5 -6.0 Strontium 0.5-7.0 Carbon 0.2-4.0 Aluminum 2.5-6.5 Calcium 0.1 * —5.0 Iron Rest Sources information taken into account during the examination 1. Durrer R. and Volkert G. Metallurgy of ferroalloys. M., 'Metallurgy', 1976, p. 20. 2. US patent Ν '3765875, CL 75-130, 1974. 'Compiled by V. Rybintsev