SU705000A1 - Cast iron alloy - Google Patents

Description

.1 The invention relates to the field of metallurgy, in particular, to a master alloy for producing low-alloyed iron with improved physico-mechanical properties. The following ligature is known, weight. %: Silicon ZO-40 Manganese to 1.0 Aluminum to O, 5 to 0.5 Iron to 0.25 Carbon to 1.0 to 0.05 Phosphorus to 0, O5 Else |, 1 Nickel The disadvantage of the known ligature is low modifying ability. The closest to the invention of the technical essence and the achieved result is a ligature for the chug on the following composition, wt.%: 20-30 Silicon 1.2-2.5 Manganese 1.2-2.4 Nickel D-35 Tungsten 1.75 -5.0 Else. Iron The disadvantage of such a ligature is a high melting point of 1380-1390 ° C, an unsatisfactory microstructure containing free cementite, low iron absorption of 72-74%, and low strength and antifriction properties of the iron. The tensile strength of a cast iron modified with a known ligature is 22–23 kg / mm in tension, 0.2% to 15.3–16.3 kg / mm in strain, and the relative wear resistance is 1–1.05. The aim of the invention is to reduce the melting texture, increase the degree of assimilation of iron, improve the microstructure of cast iron and increase its strength and anti-friction properties. 3 7050 This is due to the fact that the ligature for cast iron, containing chromium, silicon, manganese, tungsten, iron and ni-sep, additionally contains carbon, copper and titanium. The following ratio of components is 5 nanometers, weight,%: Rom 2-40 Silicon 10-25 Manganese 0.1-3.5, Q Tungsten 0.1-4.0 Iron 0.5-8.0 Carbon 0.1-0.85 Copper 0.5-10.0 Titanium 0.1 -8,015 Nickel Else. 00 .4 Example. The ligature of the melt goat in the induction furnace MGP - 102. The alloying of cast iron is carried out by composition, wt.%: 3.24 carbon, 1.62 silicon, 0.63 manganese, 0.06 chromium, 0.08 nickel, 0.1 copper, 0.07 phosphorus, 0.03 sulfur. After: the molten iron is overheated to 1430 ° C, poured in portions of kg into a ladle and then into a small one, together with a ligature treatment. injected in an amount of 1% by weight of the liquid metal. The table shows the composition of the ligature and the properties of alloyed cast iron. The cast iron structure contains finely graded graphite. 705000 From the data presented in the table it follows that the proposed ligugur, in comparison with the known, has a lower melting point, a higher percentage of pig iron absorption, improves the strength and antifriction properties of cast iron, and improves its structure. Invention Ligature for cast iron containing chromium, silicon, manganese, tungsten, iron and nickel, characterized in that, in order to reduce the temperature of the melt iron, increase the absorption rate of the iron, improve the microstructure of the iron and increase its strength and strength tifrici do noo cling properties, it is additionally carbon, copper, n titanium with a slit ratio of components, wt.%: Chromium 2-40 Silicon 10-25 Manganese 0.1-3.5 Tungsten 0.1-4.0 Iron 0.5-8, 0 Carbon 0.1-0.85 Copper0.5-10.0 Titanium0.1-8.0 NickelEverything else. Sources of information, taken into account in the examination 1. The author's certificate of the USSR 236771, cl. C 22 C 35/00, 1967, 2. The patent of England No. 128424, C 7 A, 1972.