SU1235979A1 - Steel - Google Patents

Description

The invention relates to metallurgy, in particular to tool steels for the manufacture of hot forming dies and molds.

The purpose of the invention is to increase hardenability and wear resistance of steel.

The chemical composition of the investigated bottoms of the proposed and known steels and the corresponding properties are given in Table. 1 and 2.

The introduction of titanium carbonitrides in an amount of 0.10–0.7 wt.% Strengthens the structure, increases the hardness, hardenability depth and wear resistance. At a concentration of titanium carbonitrides of up to 0.10 wt.%, The structure hardening, an increase in hardenability and wear resistance is insignificant, and at a concentration of more than 0.7 wt.%, There is a release of titanium carbonitrides along the grain boundaries, a decrease in the mechanical and operational properties of steel.

Calcium borides in the amount of 0.003-0.2 wt.% Have a modifying effect and crush the structure. Note. Smelting 1 - known steel; Smelting 2-4 — The proposed steel j smelting 5.6 has a component content that goes beyond the limits of alloying.

359792

round, which leads to an increase in the mechanical and operational properties of steel. When the concentration of calcium borides is less than 0.003 wt.%, The modifying effect and the increase in mechanical and operational properties are not observed, and with an increase in the content of calcium borides more than 0.2 wt. and technological properties of steel.

The hardenability of steel is determined by the method 15 of face hardening into oil after heating the samples to 1123 K. The tests for wear resistance of samples made in the form of washers with an external and internal diameter of 22 and 20 10.5 mm are carried out at a specific pressure of 0.3 tffia at 573 K. The counterbody is a sample of the hard alloy BC-3.

As can be seen from the table. 2, we offer 25 steel in comparison with the known one has high characteristics of hardenability, wear resistance and service resistance.

Table 1

0.2 Else

0,,,,, 23- Editor N. Yatsola

Order 3066/27 Circulation 567

VNISh State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Table 2

Compiled by V. Brostrem

Tehred O. Gortvay Proofreader O. Lugova

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Claims (1)

STEEL containing carbon, silicon, manganese, vanadium, chromium, nitrogen and iron, characterized in that, in order to increase hardenability and wear resistance, it additionally contains titanium carbonitrides and calcium borides in the following ratio, wt.%: Carbon 0.4-0.9 Silicon 0.1-0.3 Manganese 0.2-0.5 Vanadium 0.3-0.9 Chromium 0.05-0.3 Nitrogen 0.02-0.2 Carbonitride titanium; 0.10-0.7 Calcium borides 0.003-0.2 Iron The rest § ye SP m