SU855050A1 - Steel - Google Patents

Description

one

The invention relates to metallurgy and can be applied in the metallurgical and engineering industries for the production of cast parts operating under high impact and fatigue loads at. negative temperatures.

Known CTaj # 1, containing

weight.%:

0.35-0.50

Carbon 0.5-1

Silicon 0.8-1.5

Manganese 0.05-0.5

Nickel 0.05-0.5

Chrome 0.05-0.2

Vanadium 0.001-0.05

Calcium O, O 05-0, 03

Titanium 0.0005-0.003

Boron

0,015-0,06

Aluminum Rest

Iron

Closest to the proposed technical essence and the achieved effect is steel 2, containing, in weight,%:

Carbon0.36-0.50

Silicon 0.20-1.0

Manganese0.45-1.0

Bor0.001-0.05

Titan0,01-0,06

Vanadium...

Nitrogen0,005-0,014 Rare-earth metals 0,001-0,01 Magnesium 0,001-0,03 Iron Else However, this steel has insufficient strength, ductility, toughness, and low wear resistance or foundry properties.

ten

The purpose of the invention is to increase the mechanical properties, toughness at a negative temperature, wearability and casting properties.

15

The goal is achieved by the fact that steel containing carbon, manganese, silicon, titanium, boron, vanadium and iron, additionally contains yttrium and calcium in the following 20, wearing components, wt.%:

Carbon0.35-0.45

Manganese1,2-1,6

Silicon0.3-0.6

Titanium0.005-0.015

25

Bor0,0005-0,003

Vanadium 0,01-0,06

Yttrium0,0001-0,01

Calcium0,0001-0,02

IronErest

thirty

Melting of the proposed and known; steel was produced in an induction furnace with a capacity of 60 kg.

The chemical composition of steels is given in Table. 1. .. The fluidity of melted steels is determined by pouring the metal into process samples at temperatures of 1510–1600 ° C, covering all the working temperatures of the steel at the time it is released from the furnace and cast into molds.

The results of the casting properties are given in table. 2

I From the table. 2, it is clear that, compared with the known, steel has a high fluidity and 1 Less prone to cracking. This is due to the absence of magnesium in the pre-Lagum steel, which promotes the formation of foam. In addition, the quantized yttrium and calcium change the composition and shape of nonmetallic inclusions, which also leads to an increase in sludge flow.

The results of the physicomechanical properties are given in Table e. 3,

Below is the test data on the known and expected steel for abrasive wear after heat treatment (quenching from lOSO C tempering 600-650 C).

Melting steel Relative We offer wear resistance

11,545

21,547

31,545 Known 1,296

It can be seen from the above data that the proposed steel has higher mechanical properties and wear resistance, especially high impact strength with negative t & The threshold of cold breaks at the proposed mouth is lower.

Thus, the proposed structural steel, in comparison with the known, possesses enhanced physical and mechanical properties, is more plastic, has increased toughness (especially at negative temperatures, higher fluidity and crack resistance.

table 2

Claims (2)

Invention Formula : Steel containing carbon, manganese, silicon, titanium, boron, vanadium, and iron, characterized in that, in order to increase the furTable 3 fQi properties, toughness at negative temperature, wear resistance and casting properties, it additionally contains yttrium and calcium in the following ratio 5 components, wt.%: 0.35-0.45 1 / 2-1.6 0.3-0.6 0.005-0.0-15 0,0005-0.003 0.01-0.06 0.0001-0.01 0.0001 -0.02 Else Sources of information taken into account in the examination ;, Ai. USSR author's certificate, cl. C 22 C 38/54, 1977. 2. Copyright USSR USSR I 644664, cl. C 22 C 38 / i4, 1979.