SU767227A1 - Cast iron - Google Patents

Description

(54) PIGER The invention relates to the field of ferrous metallurgy, in particular to cast iron used for casting chill molds. , Cast iron of the following composition is known, 5 wt.% 2.7-3.8 Carbon. 1.6-3.6 Silicon 0.2-1.2 Manganese 0.1-0.4 to Nickel 0.001-0.4 0.03-0.25 0.03-0.25 Calcium 0.01-0 , 06 Magnesium Rare-earth metals 0,005-0,25 Else ij. Iron The disadvantages of the known iron are the tendency to chill, the formation of shrink holes and residual stresses in the castings. Closest to the invention, according to the technical essence and the achieved effect, cast iron of the following composition, wt.% Carbon 2.6-4.5 Silicon1.0-4.0 Manganese 0.1-1.2 Chromium 0.01-0.5 Copper0.01- 1.0 s selected from the list of wines in hot water on the right 0.01-1.0 Nickel 0.015-0.06 Calcium 0.015-0.1 Magnesium. Rare-earth metals 0,005-0,15 0,005-0,4 Aluminum Else 2 Iron The disadvantages of this cast iron are a large volume of shrink holes, ate and high residual stresses in castings. The chill-out depth in the wedge is 7.5 mm, the volume of shrinkage is 5.2%, and the residual stresses of castings are 1.7 kg / mm. The purpose of the invention is to reduce the volume of the shells, bleaching and residual stresses in the castings. To achieve the goal, the cast iron containing carbon, em, manganese, chromium, copper, copper, calcium, magnesium, rare earth metals, aluminum and iron, which is different from that known to contain iron, contains components and follows the ratio, wt.% Carbon 3, 25-4.0 Silicon1.9-2.9 Manganese 0.1-1.0 Chromium. 0.05-0.3.

0.1-0.9. 0.1-0.3 0.005-0.1 0.001-0.008

spruce

0.001-0.1

0.03-0.1 Else

PRI me R. Cast iron was smelted in an induction furnace, and cast iron Cherepovets-O of a metallurgical plant, steel, 15, ferro-sicilium, and ferroalloys were used as the charge. Cast iron overheated in the furnace to 1450-1470 С

Copper and nickel were introduced into the mixture, calcium was introduced in the form of ferrosilicage, magnesium - in the form of iron-silicon-magnesium ligature, containing 3.8% magnesium. Rare earth metals were introduced in the form of cerium mitmetall with a cerium content of 49%.

The table shows the composition of the proposed iron and its properties.

From the data in the table, it follows that the proposed cast iron, in comparison with the known, has less chill, volume of shrink holes and residual stresses in castings.

1 3.25 1.9 0.1 0.1 0.1 0.05

3.65 2.45 0.45 0.15 0.45 0.18 0.004 0.08 0.02 0.06 Also

Claims (2)

4.0 2.9 1.0 0.3 0.9 0.3 0/000 0.1 0.1 0.1 The same Formula of isotopes Cast iron containing carbon, manganese silica, chromium, copper, nickel, calcium, magnesium, rare earth metals aluminum and iron, which is also distinguished by the fact that, in order to reduce the volume of shrink holes, chill out and residual stresses in the castings, it contains components in the following ratio, wt.% Carbon 3.25-4.0 Silicon1.9-2.9 Manganese 0.1-1.0 Chromium - 0.05-0.3 2.7 1.0 4.0 1.0 2.7 4.0 0.001 0.005 0.005 0.03 Ootal- 3.9. 2.75 1.0 0.1-0.9 0.1-0.3 Nickel 0.005-0.1 Calcium 0.001-0.008 Magnesium Rare-earth 0.001-0.1 Metals 0.03-0.1 Aluminum Rest Iron Information sources , which are taken into account during the examination 1. USSR author's certificate 49103, cl. C 22 C 37/00, 1973. 2. Authors certificate of the USSR 50453, cl. C 22 C 37/10, 1975.