SU142325A1 - Structural steel - Google Patents

Description

Known structural steels have a number of disadvantages, one of which is their high nickel content.

The peculiarity of the invented steel is that, in order to increase the hardenability depth and save nickel, it has a new combination and percentage composition of elements.

Structural steel may contain up to 0.03% boron as a modifier.

Steel has the following chemical composition (n%): carbon 0.12-0.22, silicon 0.7-1.1, manganese 1.8-2.2 chromium 1.8-2.2; tungsten 0.8-1.2, nickel up to 0.35, titanium or zirconium up to 0.1.

Structural steel after quenching and low abrasion has the following mechanical properties:

temporary resistance 120-125 kg / mm;

elastic limit105-115 kg / mm-;

elongation 10%;

compressing a cross sectional area of 50%;

impact viscosity 10-9 kgm / cm:

Brunel hardness2.9-3.4 units

The steel may be applied cemented or after conventional heat treatment. The presence of tungsten in steel contributes to an increase in the depth of its hardenability, and the presence of silicon to a certain decrease in the concentration of carbon in the cemented layer.

The described structural steel is intended for use in mechanical engineering, aeronautical industry, etc., where the use of high purity metal is required. .Nb 142325- 2. ,,:; . The subject of the invention is 1. Structural steel, characterized by increasing depth. hardenability and economy zhit (%): -yUl GU: carbon. - silicon - manganese chromium tungsten nickel titanium or zirconium 2. Structural steel according to claim 1, I distinguish in it boron is introduced to 0.03%. the fact that, for the purpose of nickel, it contains 0, 12-0,22 0,7-1,1 1,8 -2,2 1,8 -2,2 0,8 - 1,2 to 0,35 to 0 , 1, so that