SU1008269A1 - Master alloy - Google Patents

Abstract

LIGATURE, containing calcium, boron, guitar, and silicon, which is different from that, with the aim of increasing the modifying ability when processing iron-carbon alloys, it additionally contains social materials such as rare earth metals, nitrogen and manganese at the following component ratio of Calcium 5.0- 25.0 Bor3.0-15, O Titan0.5-20, O Rare-earth metals2, O-5, O Nitrogen, OO1-O, 5 Manganese, 0.1-5.0 Silicon, Other

Description

The invention relates to metallurgy, in particular, to ferroalloys for foundry production and can be used for the motivation of iron-carbon alloys.

Known ligature for iron and steel nfj, containing, wt.%: Vanadium 5, O-14.0

Silicon .5.0-30.0

Manganese5.0-25.0

Chrome1, O-3.0

Titan0,1-2,0

Carbon 0.2-4.0

Nitrogen, C), 1-O, 4

Iron. OS-1

Closest to the proposed technical essence and the achieved result is the ligature L2J, containing, wt.%:

1.0-5.0 25.0-65.0 10.0-30.0 1O, O-4O, O 0.2-15.0 0.1-10.0 Else

However, this alloy has insufficient modifying ability, which is expressed in grinding and increasing the equiaxiality of metal grains in construction.

due to the structural and size mismatch of the crystal lattices of the components of the austenite crystal lattice introduced into the alloy.

The purpose of the invention is to increase the mechanical properties of the alloy being processed and to enhance the modifying ability of the master alloy, expressed in

millenia and increase the equiaxiality of the iron-based alloy grains due to the formation in its composition of compounds with structural and dimensional lattice correlations

with austenite grate.

. The goal is achieved by the fact that the GU league, containing calcium, boron, titanium, and silicon, contains in addition rare earth metals, nitrogen

and manganese in the following ratio of components, wt.%:

5.0-25.0 3, O-15.0 0.5-20.0

spruce

2.0-5.6. about 0.001-0.5 0.1-5.0 Else

The composition of the melted ligatures is given in table. one.

Table 1

The proposed 15.0 3.0 2.0 0.5 O, 1 0, OO1 216.0 1O, 0 3.5 10, O 2.0 0.016 3: 25.0 15.0 5.0 20.0 5 , 0 6.5 Known7, 0 3, O- 15.0 - Experienced by the effect of modifying the melt with ligatures, from the waist of P12 on the mechanical properties, the magnitude and degree of equiaxiality of grains in the crystallized metal. Ligatures are introduced

in melt in the amount of 0.3 wt.% steel. The structure of the crystallized metal is examined in cylindrical specimens molded into sandy clay forms. .. Ostal-Ostal- - - Ostal- --40, 0 Osgal- 20.0 5.0

31O082694

The test results are shown at run at (). Isletsutable 2 and 3. are hard, temporary resistance

Steel specimens are subjected to quenching during bending to impact in a strain of 1250 ° C (1523K) and threefold

UnmodifiedNonquality As the test results show, the steel modified by the proposed ligature has the best complex of mechanical properties, the grain is 1.5-2.0 times smaller, and the equiaxiality is higher than that modified by the known ligature that gives you the abilityTable 2

Table 3

The ability to improve the performance properties of cast steel and to refuse to normalize castings, v The expected economic effect for 50 due to the elimination of the normalization of casting is 8-15 rubles per 1 ton of castings.

Claims (2)

A master alloy containing calcium, boron, titanium and silicon, different heme, which, in order to increase the modifying ability in the processing of iron-carbon alloys, it additionally contains rare earth metals, nitrogen and manganese with the following nents, weight <% :: Calcium Bor T ethan Rare Earth Metals Nitrogen Manganese Silicon ratio compo 5.0-25.0 3.0-15.0 0.5-20.0 2.0-5.0 0.001-0.5 0.1-5.0 The rest. >