SU645977A1 - Steel - Google Patents

Description

(54) STEEL

one

The invention relates to metallurgy, mainly to the production and use of alloyed steels, and can be used to make links of a tractor caterpillar with quenching of HDTV, track cogs, tractor caterpillar shoes.

Known steel containing, wt.%;

0.32-0.44

Carbon

0.6 -1.2 Manganese Silicon

0.2-0.6 # 0.03-0.1 Aluminum

0.02 -0.08 Titanium

0.002-0.005 Bor

Calcium

0.005-0.05

Else l, Iron A disadvantage of the known steel is a low fatigue strength and a high cold brit threshold.

The aim of the invention is to increase fatigue strength and lower the cold brit threshold.

This goal is achieved by the fact that the proposed steel contains components in the following ratio, wt.%:

Carbon 0.35 -0.50 Silicon 0.17 -0.40 Manganese 0.9 -1.2 Bor0,0008-0.003

Titanium0,011-0,05

Aluminum 0,008 -0,05 Iron Else The chemical composition of the investigated heats of the proposed steel is presented in table. one.

Table 1 .. vi-wilLj Fatigue strength was adjusted by spinning Yaler's crooked and position, cold brittleness threshold. By conducting serial tests in the temperature range from +20 to -80 ° C. The criterion of -50% fiber was adopted. nistkogo break. Fatigue strength C and threshold of cold brittleness of the proposed steel in comparison with the known steel Table2

Claims (1)

Invention Formula Steel, holding carbon, silicon, manganese, boron, titanium, aluminum and iron, characterized in that, in order to improve fatigue strength and lower the threshold of hololamosti, it contains the components in the following ratio, weight: Carbon 0.35-0 , 50 Silicon 0.17-0.40 Manganese 0.90 -1.20 Bor0,0008-0.003 Titanium0,011-0,05 Aluminum 0,008-0,05 Iron Rest Sources of information taken into account during the examination one . USSR author's certificate P 539981, CL. C 22 C 38/14, 1975. The images were tested in the quenching condition from a temperature of 850 ° C and high tempering. The level of strength after this treatment corresponded to 90 + 3 kg / mm. As can be seen from the presented results, the proposed steel in comparison with the prototype has a higher fatigue strength limit at a lower position of the cold brittleness threshold, i.e. higher structural durability and reliability.