SU598953A1 - Pig iron - Google Patents

Description

(54) CAST IRON

one

This invention relates to the field of metallurgy, in particular to the production of doped nodular ferritic cast iron, which has a higher level of impact at positive temperatures.

The closest to the invention according to the technical sutnosti and the achieved result is cast iron; t; j of the following chemical composition, wt.%:

2.7-3.8

Carbon

1.6-3.6 Silicon

0.2-1.2 Manganese

0.01-0.06 Magnesium

0.03-0.05 Calcium

0.01-0.3 Chromium

Rare-earth0, 005-0,25 metals 0.01-0.3 Copper 0.01-0.4 Nickel Else Iron As an impurity, cast iron may contain, in wt%:

Sulfur. Up to 0.01 Phosphorus Up to 0.15 Known cast iron has the following mechanical properties:

Strength limit, kg / mm 55,4-62 Yield strength, kg / mm 38,1-40

Relative elongation;% 6.3-9.7

Shock in ekost kg / cm 3,6-5,0 Hardness НВ197-21

The disadvantages of the known cast iron are reduced plastic properties and lateral hardness, which makes it unsuitable for operation at negative temperatures.

The purpose of the invention is to increase the toughness of cast iron at temperatures down to minus.

This is achieved by the fact that cast iron containing carbon, silicon, nickel, manganese, magnesium, calcium, rare earth metals and iron, additionally contains silicon and tin in the following ratio of components, wt.%:

The composition and mechanical properties of the samples proposed alloy-are given in table.1.

Tests with low temperatures on notched impact samples are carried out at temperatures plus, fviHHyc 20 ° C, minus, minus.

The results are shown in table 2.

As can be seen from the table, the impact viscosity determined on samples with a notch, described cast iron is 1.3-1.5 times higher at plus and minus 20s than in the known, and at temperatures of minus and minus 2-3.8 and 1 times, respectively.

The proposed cast iron can be used for the manufacture of cast parts operating at lower temperatures.

Claims (1)

Invention Formula Chugun, carbon, silicon, nickel, manganese, magnesium, calcium, rare earth metals and iron, which are characterized by the fact that, in order to increase the impact toughness at temperatures down to minus, it additionally contains aluminum and tin in the following ratio of components, , veb.%: Ugrorod 2.92-3.48 Silicon 1.67-2.25 0.59-1.10 Nickel 0.35-0.86 Manganese 0.036-0.052 Magnesium 0.025-0.03 Calcium Rare-earth0, 03-0.10 Metals 0.058-0.092 Aluminum 0.011-0.057 Tin Remain. Iron Sources of information taken into account in the examination: I. USSR author's certificate 449103, cl. C 22 C, 37/00, 1974.