SU522258A1 - Steel modifier - Google Patents

Description

(54) STEEL MODIFIER

I

The invention relates to ferrous metallurgy and can be used in the production of castings and rolled low carbon steel steels with improved physical and mechanical properties.

Known modifier for steel of the following composition, wt. %:

Calcium 5-20

Magnesium2-5

Rare earth metals 5-15

Aluminum5-15

Manganese 5-10

Silicon15-40

Iron rest.

However, steels modified with lime modifier have low strength characteristics.

For example:

For steel grade 20

H

Strength of b51,5 kg / mm

Yield point "T s23 kg / mm

For steel grade 30

Strength limit b b 73,5 kg / mm

Yield point 45.5 kg / mm

For steel grade tO GN

Strength of b 48.5 kg / mm

one

Yield point S S34 kg / mm

6 The proposed modifier is different in that, in order to increase the physicist's mechanical properties of steel, it additionally contains nitrogen and boron in the following ratio of components, weight. %:

0 Cree day1-10

Rare Earth Metals 6-15 Alylvshiy1-10

1 manganese11-25

Vanadium10-30

5 Cr. 8-20

Nitro 0.5-2

Bor0,2-2

Iron rest.

In the table, the physicomechanical characteristics of steel grades 20, 30, and 10 GI modified with the proposed modifier were introduced: 0.3, 9 introduced into the melt (by weight of metal).