SU570655A1 - Foundry alloy - Google Patents

Description

1-15 0.5-5.0

2-40 0.5-5.0 1.0-3.5 Else

The ligature is used to alloy and deoxidize steel and cast iron. Ligatures are added to the liquid metal in a ladle or smelter.

Chromium and magnesium introduced into the ligature protect alloying and modifying elements from oxidation: rare-earth metals, vanadium, and promote their uniform distribution in the metal. The ligature has a high density and is immersed in the deeper layers. When the ligature is dissolved, the magnesium is released and at a high speed moves from bottom to top, mixing layers of metal and ligature. This contributes to the deep deoxidation of iron and steel, increasing the degree of assimilation of components and modifying their action, reducing the consumption of the modifier, as well as removing gases and sulfur from steel and iron.

The process is as follows.

In a laboratory induction furnace with a capacity of 35 kg, mild steel containing molten metal is melted; carbon 0.12%, manganese 0.10%, silicon 0.05%. Before releasing this metal from the furnace, a ligature of the following composition is introduced, wt. %: silicon 21.5; manganese 27.6; chromium 26.2; vanadium 5.4; Rare earth metal

4.6; magnesium 2.3; titanium 0.71; calcium 0.61. Get the metal of the following composition,%: C 0.32; Mp 1.05; Si 0.48; Cr 0.90; V 0.15; REM (amount: cerium, lanthanum, neodymium and others.) 0.048; Ti traces; Sa traces. Thus, the assimilation of elements is: vanadium 98%, chromium 99,%, manganese 99%, rare earth metals 36.4%. With the introduction of these elements into steel by ferroalloys or known ligatures, the assimilation of these elements is 5-10%, and the rare-earth metals are 1.5-2 times lower.

Comparative data of known and proposed ligatures depending on the content of rare-earth metals and carbon are given in Table. one.

Table 1

In addition, the effect of the optimal 25 magnesium and chromium additives on the grain size and the uniform distribution of elements over the cross section was studied. For this purpose, a series of swimming trunks with varying magnesium content and chromosity of the table can be seen that the optimum magnesium content in the ligature is 2.5%, and chromium is 20%. In this case, the smallest content of non-metallic inclusions is achieved, the best distribution of elements over the ingot section, which is determined by the local

by chemical and special analysis, the highest grade of grain.

Claims (2)

As can be seen from the above data, the proposed master alloy has a clear advantage compared with the known alloys. Increasing the effect of the modification allows for removal in the ligature. At the same time, the composition of the initial metal does not change, and the composition of the master alloy differs only in the content of chromium and magnesium (see Table 2). Table 2: Modifier and alloying consumption, such as vanadium, chromium, rare-earth metals, by 20-50%. The introduction of the proposed ligature for deoxidation and alloying improves the quality of cast iron and steel for various purposes, improves the performance characteristics of the products made from them, which gives the national economy an economic effect of 25 rubles. per 1 ton ligatures. Invention Ligature for the deoxidation and alloying of steel and cast iron, containing vanadium, silicon, manganese, calcium, titanium, chromium, magnesium and iron, in order to increase the degree of utilization of the main elements, their uniform distribution over the cross section of casting and increase degree of modification, rare earth metals and carbon are additionally included in it, and the following ratio of components, c. %: Vanadium 5,0-25,0 Silicon 10,0-40,0 Manganese 8,0-40,0 Calcium 0.5- 5.0 Rare-earth metals1, 0-15.0 Titanium 0.5- 5.0 Chromium 2.0 -40.0 Magnesium 0.5- 5.0 Carbon 1.0- 3.5 Iron Else Sources of information taken into account in the examination 1. US patent number 3383202, cl. 75-122, 66. 2. USSR author's certificate No. 451777,. C 22C 35/00, 1973.