SU724595A1 - Thermoresistant cast iron - Google Patents

Description

   1 The invention relates to metallurgists in particular to the development of heat-resistant cast irons. Known heat-resistant cast iron l3 of the following chemical composition, weight. Carbon3,2-3,8 Silicon1,8-2,6 Manganese0,1-0,5 Chrome0,1-O, 6 Molybdenum 0,1-0,6 Nickel0,5-3,5 IronEstalled And the ratio of chromium to nickel is n more than 0.4. Cast iron has a hardness of not more than 229NB. The closest to the described invention in technical essence and the achieved result is heat-resistant cast iron 2} of the following chemical composition, weight,%; Carbon2.5-2.8 Silicon0.3-0.4 Manganese1, 1.5-4.5 Aluminum 0.6-0.8 Copper 0.08-0.12 Magnesium Calcium 0.01-0.03 0, 12-0.25 Cerium Rest Iron The disadvantages of the famous cast iron are the propensity to form shrinkage films, to film formation, as well as the possibility of smelting it in a cupola for a low silicon content. The aim of the invention is to improve the density of castings. This goal is achieved by the fact that the bridge-resistant cast iron contains the following components of the ratio, weight,%: Carbon3, O-3.7 Silicon1.3-2.6 Manganese, 0.3-1.0 Aluminum1.0-1.45 Copper 0.6-0 , 8 Magnesium0.005-0.06 Calcium0, OO5-O, 1

Cerium0,005-0,1

IronLean

The proposed cast iron can be melted in a cupola, electric arc or induction furnaces. When smelted in iar. The aluminum wound is introduced into the ladle when cast iron is released. When smelted in an elektrodukh howl and induction furnaces aluminum enter the 51T in the furnace or in the ladle. Modifying additives calcium, magnesium are introduced into the ladle under,

CTpyto metal. The tamper K1pzh11o to enter into the cast iron in the form of alloys kalysht-copper, silicocalcium and ferrosilicon, magnesium in the form of various master alloys containing magnesium. -

According to the described technology, 3 compositions of cast iron are melted in a pulp furnace with a crucible capacity of 160 kg.

The chemical composition of the proposed and known 4yrjiia is given in table. one,

Table 1

Aluminum, calcium, magnesium and cerium are introduced into the ladle under a stream of metal. For this purpose, a complex modifier, containing 1 salicy, magnesium and cerium is used, and alum} shy is introduced in Pure form.

In the smelting, samples are poured onto the obsinuca) decay and staydertnye are shaped 30 mm and 34O mm long, of which. make samples for mechanical testing and heat resistance.

Table 2 shows data on the density of castings and heat resistance.

table 2

As can be seen from the table, the proposed cast iron has a higher density (a smaller percentage of the volume of the shrinkage shells).

The proposed cast iron can be used to make parts such as. cocts, molds, cylinders ,. Diesel engine heads, etc., PCs operating under variable temperature conditions.

Claims (2)

Invention Formula Heat-resistant cast iron containing urrode, silicon, manganese, aluminum, copper, magai, calcium, cerium and iron, is different because in order to increase the density of castings, it contains components in the following ratio, wt.% Carbon3-3,7 Silicon1,3-2,6 Manganese 0.3-1.0 Aluminum1.0-1.45 Copper 0.6-0.8 Magnesium0,000-0.06 Calcium0.005-0.1 5724595 6 Cerium0.005-0.11. Copyright svdedelstvo USSR Iron The rest № 380738, cl. C 22 C 37/10, 1968. Information sources, 2. USSR author's certificate taken into account in the examination number 441331, cl. C 22 C 37 / OO, 1973.