SU1235980A1 - Bearing steel - Google Patents

Description

The invention relates to the field of metallurgy, in particular to steels used for the manufacture of rolling bearings.

The aim of the invention is to increase the wear resistance and hot plasticity of the bearing 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.

Proposed and known steel are compared for a number of operational and technological properties in the state of delivery and after quenching from and tempering at a temperature

0

160 C for 2 hours

Wear resistance is investigated in the mode of dry friction with a ball diameter

Note. Smelting 2-4 - proposed steel;

Melting 6 - ShKh15 steel is known; melts i and 5 have extreme component content

359VO2

9.5 mm of steel 111X15 with a load of 30 MPa. The test time is 1 hour. Hot torsion is determined by twisting samples with a length of

5 working parts 40 mm and diameter 8 mm. The proposed steel (compounds 2-4) exceeds the well-known steel 111X15 (composition 6) in hardness, penetrability and wear resistance. Compliance with the chemical composition of the proposed steel at the lower limit results in low hardness, at the upper limit - to a significant decrease in ductility during hot conditions.

15 pressure treatment and impact strength (smelting 1 and 5).

The economic effect is achieved by increasing the performance of the bearings,

Table 1

Editor L. Gratilllo

Order 3066/27. Circulation 567

VNIIPI USSR State Committee

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

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

table 2

Compiled by V. Brostrem

Tehred O. Gortvay Proofreader L. Patay

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Claims (1)

BEARING STEEL containing carbon, manganese, silicon, chromium, iron, characterized in that, in order to increase wear resistance and hot ductility, it additionally contains cerium, yttrium and calcium in the following ratio of components, May.%: Carbon 0.95-1.05 Manganese 0.70-1.00 Silicon 1,50-2,50 Chromium 0.40-0.60 Cerium 0.005-0.05 Yttrium 0.005-0.05 Calcium 0.005-0.05 Iron Rest