SU785376A1 - Cast iron - Google Patents

Description

(5O CAST IRON

one

The invention relates to the field of metallurgy, in particular to low-alloy cast iron, intended for the manufacture of parts operating in an abrasive environment under conditions of shock loading.

Nowadays, in order to increase the structural strength and wear resistance of cast iron for castings, scarce alloying elements, such as Mo, W, Ni, Co, V, having a high value of 1, are used.

Under the conditions of the USSR, low-alloyed cast irons with Cr, T1, V, B, C, etc. additives are often used, possessing a certain wear resistance and durability of HzL. Such pigs are inexpensive, technological, however, in connection with the growth of production capacity and intensification of production For parts and parts, such as grinding media, the cast iron cannot be used due to insufficient safety margin and wear resistance due to low impact resistance.

The closest to the described invention to the technical essence and the achieved result is cast iron of the following chemical composition, wt.%:

2.6-3.6

Carbon

1.3-2.8

Silicon

0.3-1.0

Manganese

0.2-1.0

Chrome. 0.05-0.4

Titanium

0.1-0.25

Vanadium

0.1-0.3

Aluminum Rest z1

Iron

According to its technological and physicomechanical properties, said cast iron basically satisfies the requirements imposed on cast iron, however, it is not a sufficiently wear-resistant and ductile material. 15 This cast iron has the following disadvantages: low durability, icing, impact resistance and corrosion resistance.

The aim of the invention is to increase durability, toughness, impact resistance and corrosion resistance.

This goal is achieved by the fact that cast iron containing carbon, cream, manganese, chromium, titanium, vanadium, aluminum and iron, additionally contains copper and nitrogen in the following ratio of components, wt.%:

Carbon 2.6-3.6

Claims (3)

30 Silicon 0.6-2.5 Manganese 0.33-1.5 Chromium 0.09-1.0 Titanium 0.02-0.40 Vangshiy 0.03-0.30 Aluminum 0.02-0.30 Copper 0.02 -1.0 Nitrogen .0.005-0.04 Iron Else To increase the service life of iron pigments used, for example, in cement and mining industry cement mites, was achieved by additional doping with copper and nitrogen. The deterioration of the properties (wear resistance and impact resistance) of cast iron is achieved by complex doping of Ti, V, A1, Cu and N. In this case, the carbide-forming elements contribute to the increase in the content of perlite in the metal matrix, and such elements as T1 and V in the specified amounts, they also contribute to the refinement of graphite. and increase the uniformity of the distribution of b inclusions. Taking into account that the properties of cast iron for 8GSyt from both graphite and matrix, this line allows to obtain the optimum properties due to the addition of copper and nitrogen to the composition of cast iron. The most effective for low alloyed cast irons is the simultaneous doping with elements. Oppositely affecting graphitization. This refers to the graphitizing additives and additives, which determine the thermodynamic activity of YT: Lerod by displacing the carbide-forming elements from the tBerdy solution. It has a positive effect on graphitization in the area of extrinsic conversion, slows down the formation of graphite transformation, contributing to the production of stable pearlite structures. Copper also has a positive line on the dispersion of the iron matrix, grinding the sizes of austenite dendrites and increasing the dispersion of perlite. With a copper content of up to 1% in terms of piffiraefcfl, the corrosion resistance of iron is important, which is important when working with such products7 for body and mining and cement industries when grinding materials. AzSH in pr; by means of quantity of goods, also equip up to 1SHWH11 service properties of cast iron by improving the shape of graphite, casting properties of castings (when the content at the lower level is 0.005% and higher) .The dispersion of all the structural components of the whole | content in the middle and upper level (0.02-0.04%), especially in combination with carbide-forming elements V and T}. Nitrogen interferes with graphitization both during crystallization and in the eutectoid interval. Thus, nitrogen and copper, under appropriate crystallization conditions and in combination with V, Ti, Cr and A1, have a positive effect on the properties of the iron. on: the presence of V and T in combination with nitrogen prevents the formation of gas pockets, coarse graphite precipitates - sang, which drastically reduces the strength characteristics of cast iron. Nitrogen and copper contribute to the further pearly structure, increase dispersion: the structural components, thereby increasing the strength, wear resistance of cast iron and resistance to impact loads and improving the service properties of cast iron by 50-80%. Nitrogen and copper contribute to the expansion of the applicability of the pig iron of the proposed composition, in the factory, iron from different classes (white, gray, half) with a good complex of properties can be obtained from the conditions of melting and is associated with the formation of complex nitrides (carbonitrides) of titanium, vanadium , aluminum and their role in the processes of carbide and graphite formation1 ((. Copper in the indicated amounts improves the corrosion resistance of the alloy. Copper and nitrogen further strengthen the metal matrix due to dispersion In the iron foundry shop of the Baku Experimental Mechanical Foundry named after B6 | i6BCKor6, additional melting of the proposed cast iron was carried out on the cupolas with a capacity of 3 tons / hour. The chemical composition and properties of the cast iron are shown in the table. The table shows the number of unplayed during testing of the grinding bodies. The relative wear resistance was obtained when testing for abrasive wear on the HB-4 machine, corrosion resistance was tested and in the environment of flowing sea water. From the data in the table it can be seen that the proposed cast iron has significant differences from the well-known cast iron, expressing timings in the increased service characteristics. At the same time, the introduction of new elements (Cu, N) is made at the expense of cheap by-products and does not require a significant increase in the cost of doping. 7 78537 Formula of the invention: Cast iron containing carbon, silicon dioxide, manganese, chromium, titanium, vanadium. aluminum and iron, which is also distinguished by the fact that, for the purpose of better-5, neither wear resistance, strength, impact resistance, corrosion resistance, it additionally contains copper and nitrogen in the following ratio of components, wt.%:. Coalleg 2 6-3 80 - silicon o .6-2.5 Manganese 0,3,3-1,5 Chromium 0.09-1.0 Chitan 0.02-0.40 8 Vanadium 0.03-0.30 Aluminum 0.02-0.30 Copper 0.02-1 O Nitrogen O 005-0 04 Iron Else, Sources of information that have been taken into account in the examination of 133b2 G C T2G I / SS 1972 1336919, C. From 22 to 37/00, 1972. 2. USSR author's certificate 496320, cl. C 22 C 37/00, 1974. 3. USSR author's certificate 496321, cl. C 22 C 37/00, 1974.