SU876762A1 - Modifier - Google Patents

Description

(54) MODIFIER

1 The invention relates to ferrous metallurgy, BV in particular to the stable and foundry industry. A modifier of the following composition is known, weight. %: Silicon 5-15 Calcium 2-8 Magnesium6-15 Manganese 1-10 Rare-earth metals 0.8-2 Aluminum 0.1-1.5 Copper Remaining This modifier cannot be used to modify water with high magnesium content. The closest to the proposed technical essence and the available effect is a modificato of the following composition, weight. % Magnesium6-8 Calcium3-12 Barium1-12 Rare Earth Metals1-8 Copper11-19 Nickel11CH9 Carbon0.5-6. Iron 1-15 Silicon The Other Alloy Deficiency is high magnesium content. Its introduction into steel at atmospheric pressure is accompanied by a pyroelectric effect and release of metal from the ladle. The modifier has a small specific gravity, it does not contain aluminum, - which significantly reduces the effectiveness of the modification. The use of this modifier does not allow to obtain a high level of plastic properties of steel. The purpose of the invention is to increase the ductility of steel. The goal is achieved by the fact that the modifier, containing magnesium, for alloys, rare-earth metals, silicon, iron and nickel, additionally contains aluminum — with the following ratio of components, weight: Magnesium 0.5-2.0 Calcium 2.5 12.0 Rare earth metals -. 3.4-14.6 Silicon15, Aluminum0.5-6.7

3.0-21.0

Iron 2,4-74,9 Nickel

A feature of the proposed modifier is that it selects the ratio of active elements in such a way that it provides high deoxidizing and modifying abilities due to high absorption of magnesium, calcium and rare earth metals. This modifier is intended mainly for modifying stainless and nickel-containing high-quality structural steels and alloys, it can be used for deoxidation

Famous

7.2 7.2 4.2 Else 1

Proposed

To prevent metal splashes in the process. Modifying with modifier 1, it is introduced into the steel with small weights in several steps. Steel is poured into ingots weighing .30 kg. Templates are cut out of the ingots to emit structure and samples.

The number of revolutions to failure (p) is determined to estimate the technological plasticity of the modified steel according to the generally accepted procedure on samples of 10 mm and a length of 140 mm at a temperature of 120 () s, i.e. in the course of modifying various classes of steel, cast iron and alloys. He has a high beats. weight (6.8-5.8 g / cm) and a relatively low melting point (1220-1130 s), which simplifies the technology of modification and leads to its high absorption.

Example. The effectiveness of the modifiers was tested by modifying steel 12X18H10T. The steel is smelted in an induction furnace and, after it has been deoxidized with manganese, silicon, aluminum and titanium, modification is carried out in a ladle at the rate of 2 kg / t steel. The composition of the modifiers is given in table. one.

Table

sixteen

1.2 8.1 14

for determining mechanical properties. The mechanical properties of the steel are tested in a cast state after quenching from temperature in water.

Data on the properties of steel are given in table. 2

Table 2

The procedure for the onset of plastic deformation of steel 12X18H10T. One end of the sample is fixed in place, the other rotates from the drive, the working part of the sample is in the furnace at a given temperature.

Claims (2)

1. USSR author's certificate 418552, cl. C 2 C 35/00, 1975. 2. USSR author's certificate 20. 5,34513, cl. C 22 C 35/00, 1977.