SU952992A1 - Composition of ste - Google Patents

Description

(54) STEEL

The invention relates to the field of metallurgy, in particular to heat-resistant, nickel-free austenitic steels, ductile ductile at room temperature and can be used to produce from cold castings using cold plastic deformation of machine parts and machines working at elevated to room and room temperatures. Such parts may include glass making forms, some types of pipes, parts of heat-treating furnaces. .

Closest to the technical essence and the achieved effect to the proposed is steel ij, containing, wt.%:

0.10-0.25

Carbon 0.10-0.90 Silicon 31.0-33.0 Manganese 10.0-12.0 Chromium

1.0-1.8

Aluminum 0.04-0.15 Cerium Else, Iron known The disadvantage is that it does not. lies in

has sufficient values of plasticity and strength at room temperature, not allowing

use it as a material suitable for cold extrusion of parts with complex relief.

The aim of the invention is to increase the strength and ductility of cast steel.

This goal is achieved by the fact that steel, containing carbon, silicon, manganese, chromium, aluminum and iron, additionally contains yttrium in the following ratio of components, wt.%:

Carbon 0.1-0.18

15

Silicon0,1-0,6

Manganese25-30

Chrome10-12

Aluminum1.0-1.6

Yttrium0.08-0.16

20

IronErest

A series of stashes were performed in the main induction furnace according to the generally accepted technology. The chemical composition of the experimental heats with different lm

25 contents of the elements are given in table. one.

The heat treatment mode consisted of heating to 900 ° C, holding at this 30 temperature for 2 hours and quenching of the oxen. The structure after heat treatment is austenitic. Mechanical "properties, were determined on standard specimens made from castings obtained by pouring into sand-clay forms. The test results of mechanical properties are given in Table. 2. As can be seen from the table. 1 and 2, the samples of heats 3, 4, have the optimal complex of mechanical properties. 5 and b. Increasing the yttrium content in steel to 0.2% (smelting 7) results in a deterioration of the mechanical properties at room temperature. With an increase in manganese to 35% (smelting 8), a decrease in spinnability is observed with oxidation resistance at 720 ° C. In addition, experimental data show that the proposed steel has the best deformability at

Table2 manganese in the range of 25-30%, yttria 0.08-0.16%. Steel has passed a pilot industrial test as a material for glass molds of the Provence-4 type. The results indicate a better deformability of the proposed steel. npoNtmuieHHoe using it as a material intended for the manufacture of cold extrusion parts, working both at room temperature and at elevated temperatures, will make these parts less costly and of higher quality. Cost reduction is due to the fact that the parts previously obtained only as a result of versatile machining, it is now possible to produce methods of cold pressing (extrusion). Table

Continued table. 2

Claims (1)

Claim Steel containing carbon, silicon, manganese, chromium, aluminum and iron, characterized in that, in order to increase ductility and strength, it additionally contains yttrium 'in the following ratio of components, wt.%: Carbon 0.10-0.18 Silicon 0.10-0.60 Manganese Chrome Aluminum Yttrium> Iron 25.0-30.0 10.0-12.0 1.0-1.6 0.08-0.16 Else