SU1629342A1 - Cast iron for electric range cover plates - Google Patents

Description

t

(21) 4476367/02

(22) 08.16.89

(46) 02.23.91. Bul If 7

(71) All-Union Design Institute of Electrotechnical Production Technology.

(72) S.G. Bogatyrev, G.P.Gorbunov, S.A. Komarichev, A.P.Ivankovich, A.I. Lanko and M.P.Solomkin

(53) 669.15-196 (088.8)

(56) USSR author's certificate

No. 1235974, cl. C 22 C 37/10, 1984.

USSR Author's Certificate No. 380736, cl. C 22 C 37/04, 1970.

(54) CAST IRON FOR CONFORES ELECTRIC PLATES (57) The invention relates to metallurgy and can be used in the production of electric burners, plates. The purpose of the invention is to increase the heat resistance and reduce the hardness. New cast iron contains, wt%: C 3.2- 3.7; Si 2.4-3.2; Mp 0.2-0.6; A1 0.01-0.2; Ca 0.001-0.01; Ti 0.5-0.7; Sn 0.001-0.01; Fe rest. The addition of Sn to cast iron and a change in its ratio in it made it possible to increase the heat resistance and reduce the hardness. 2 tab.

The invention relates to metallurgy, in particular to the development of cast iron compositions for electric hotplates.

The purpose of the invention is to increase the heat resistance and reduce the hardness.

The choice of the boundary limits for the content of components in the cast iron of the proposed composition is determined by the following. Complex modification and alloying of cast iron with tin, titanium, calcium and aluminum is the most optimal for obtaining the required operational properties. In cast irons with small complex additives, complex physicochemical processes take place, as a result of which the chemical composition of the phases and their structural state change and, as a result, the properties change.

Tin, which can be introduced both in pure form and with scrap of tin bronze (the accompanying impurities of copper and lead do not have a noticeable effect on the properties of cast iron) and titanium provides less dependence of properties on variations in the composition of cast iron in carbon, silicon and manganese that allows you to expand the range of use of these elements in the iron without a noticeable deterioration of properties, their content is selected, respectively, wt.%: carbon 3.2-3.7; silicon is 2.4-3.2; manganese 0.2-0.6. Further expansion of the limits is limited by the requirements for ensuring the workability of the burners. The specified content of carbon, silicon and manganese in combination with tin and titanium provides less dependence of the properties of cast iron on sulfur and phosphorus impurities | in charge materials and allows (to reduce the chemical composition of waste. Lower

s & y

with oo

four

to

The limit on the content of tin and titanium is selected according to the test results. Below the specified limit, the structure changes dramatically with a significant decrease in properties, an increase in tin content of more than 0.0) wt.% Is impractical, and an increase in titanium content of more than 0.7, wt.% Causes undesirable structural changes and reduces the properties of products. Calcium based on the content of 0.001-0.018 and aluminum 0.01-0.2 wt.% Introduced to remove chill. Otsustviyu in the structure of the proposed pig iron, SHG with a ratio of SH and NG) close to 1.5 and 1, and predominantly pearlite matrix provide higher performance properties of the burners.

Nine industrial melts of the proposed and renowned cast iron are conducted in open acidic lined induction furnaces. The charge and alloying materials used in the smelting of pig iron are manufactured by industry in accordance with state standards. The process of smelting and casting iron involves the following operations: loading the charge into the furnace, melting, removing slag, introducing aluminum, titanium, tin in aluminum foil or tinned bronze into the alloy successively, pouring iron into the casting unit, removing slag,

Note. The content of impurities, wt.X: phosphorus e is more than 0.1} sulfur is not more than 0.01; no more chrome.

0

five

0

s

Filling of molds with modifying to the stream with ground silicocalcium.

Filling takes place at 1380-1420 ° C. The chemical composition of the samples of the pilot industrial melts of the proposed and known iron is given in Table 1, while the content of sulfur and phosphorus in all experimental melts does not exceed 0.03 and 0.2-0.3 wt.%, Respectively.

As follows from Tables 1 and 2, an additional input to the cast iron of the proposed tin composition and a reduction in the aluminum content in it allows to increase the heat resistance by 1.2-1.25 times and reduce the hardness by 1.3-1.39 times.

Claims (1)

Invention Formula Cast iron for electric hotplates containing carbon, silicon, manganese, aluminum, calcium, titanium and iron, characterized in that, in order to improve heat resistance and reduce hardness, it additionally contains tin in the following ratio of components, wt.%: Carbon 3.2- 3.7 Silicon2.4-3.2 Manganese 0.2-0.6 Aluminum0.01-0.2 Calcium0.001-0.01 Titan0.5-0.7 Tin0,001-0,01 IronErest Table 1