SU823446A1 - Modifier - Google Patents

Description

. The invention relates to foundry, namely to the development of complex modi cations of DL9 cast irons. Known monodigagor for cast iron, containing in its composition magai, calcium, silicon, RMZ, aluminum and gel. 1 | However, the modifier contains a large amount of silicon, has a low density of 2.8-4.2 g / cm, and therefore must be forced into liquid cast iron, which requires additional devices and complicates the process of producing cast iron with spherical ipa fit, it does not provide the high mechanical properties in thick-walled castings of nodular cast iron, “fi high silicon content in the modifier tf1actically impossible to obtain nodular graphite iron with metallic pearlitic basis. The closest to the invention in its technical essence and the effect achieved is a modifier of the following composition, wt.%: Iron 4-60}, mfganze, copper aluminum (one or more) 5-55 Calcium 10-40. Nickel 0.5 Magyu0.5 RMZ. Up to 20 2. The specified solvent has the following disadvantages: a) high silicon content, aluminum and calcium, its density is not high (it is forced to enter the cast iron into force, which requires additional input devices; b ) even when the calcium content is at the lower limit, the mdifikgche does not dissolve well in the liquid (the modifier absorption coefficient does not exceed 45050%) D c) it cannot be practically used to obtain thicker grains

cast iron nodular castings with high uniformly distributed mechanical properties.

The purpose of the invention is to expand the mechanical cBcriicTB of cast iron in thick-walled castings.

The goal is achieved by the fact that the modifier additionally contains molybdenum and zirconium gphy in the following ratio of components, wt.%: Copper 5-50

Silicon - 0.5-2.5

Manganese 0.5-7.0

Aluminum0,3-1,0

Calcium2-8

Magnesium. 2-10

RZM2, O-15

Molybdenum1-8

Zirconium 5-10

IronErest

Example. The modifier is prepared by briquetting. First, copper-calcium-magnesium-aluminum-REM-zirconium alloy is produced. The alloys are poured into metal molds and, after cooling, are crushed into pieces with a grain size of up to 1 mm. Powder alloys are mixed with the appropriate amount of iron powder brand PZH-, 2, crushed ferrosicily brand FS-75, ferromanganese, ferromolybdenum. From this mixture, tablets of 0 8О and a height of 30 mm are pressed.

Prepare complex modifiers, compositions are given in table. one.

Table 1

15 2.5 7.0 1, O 8.0 5.0 5, O 8.0 10 Ostal Iron composition, wt.%: C 3.33; 5-1 1.7; Mp 0.5; H 0.25; Si 0.15; Wed, 2; P 0, 07, and 6 0.04 (initial content), about which lime is used as a modifier of composition, wt.%: Copper 18; silicon 5.6 manganese 7, O | aluminum 5, O; Cal days 1O; magnesium 5; REM 8, O, and iron else, and the proposed; complex modifier oor compositions 1-3.

Perlitna

Pearlite-ferlitna Ferrito-pearlitic

Plates 500x500 in size and trashable ZOO mm are cast from cast iron treated with the known and proposed complex modifier, from which samples are cut for mechanical tests (tensile strength 6 a. Stress strength KI hardness HB).

The test results are presented in Table. 2

.Table 2 .

22О

4.4

2O7

4.1

200

4.0.

193

3.7

179

3.0

163

Claims (2)

2.6 As can be seen from the table. 2, the proposed modifier allows to obtain a pearlite structure and higher (mechanical properties in thick-walled castings of nodular cast iron). The proposed complex modifier can be widely used in the production of thick-walled castings from chugzgna- with spherical graphite with high mechanical properties. Formula of inventions A modifier containing copper, cream, scientific research institute, manganese, aluminum, calcium, magnesium, rare earth metals, iron, characterized in that, in order to control the mechanical properties of chu gu on thick-walled castings, it additionally contains molybdenum and zirconium in the following ratio of components:%: 15-50 Silicon 0.5-2.5 Manganese 0.5-7.0 Aluminum 0.3-1.0 Caly1Iy 2- 8 Magnesium 5-1О Rare-earth 5-15 metals Molybdenum 1-8 Zirconium 5-10 Iron Else Sources of information that are taken into account during the examination 1. Author's certificate of the USSR 90860, class C. 22 C 35 / OO, 1976. 2. The patent of Germany No. 1284433, 18 v, 1 / O8, 1969.