SU1081232A1 - Steel - Google Patents

Abstract

STEEL containing carbon, silicon, manganese, aluminum, titanium and iron, characterized in that, in order to increase toughness and ductility, it contains components in the following ratio, wt;%: Carbon 0.55-0.65 Silicon 0.60-0.90 Manganese. 0.50-0.80 Aluminum 0.04-0.1 Titanium Oj05-0.15 Iron Else

Description

The invention relates to metallurgy, in particular, alloyed steels, and can be used to manufacture products that are subject to high wear, impact and bending loads, such as plow heaps.

Known steel tl3 increased wear resistance of the composition, wt.%:

Carbon 0.3-0.8. Silicon up to 0.35

Manganese 0.3-1.5

Chrome. 0.5-2

Aluminum 0.015-0.05

Titan0,02-0,07

Vanadium 0.05-0.2

Zinc0.05-0.2

Sulfur0.04-0.15

Iron Else

However, this steel has a relatively low ductility and toughness, which prevents its use under high operating loads.

The closest to the technical essence and the achieved result to the proposed is steel L2J composition, wt.%:

0.65-0.74

Carbon 0.15-0.35

Silicon

0.2-0.4

Manganese

0.03-0.08

Aluminum

0.01-0.1

Titanium

0.001-0.08

Calcium

0.001-0.05

Magnesium

0.001-0.08

Rare earth metal

0.05-0.2

Vanadium Else

Iron

Known steel has a high hardness after rolling, and requires additional heat treatment. In addition, the presence of silicon in steel is only a technological additive. Therefore, even after isometric hardening, the well-known steel has insufficient viscosity and ductility and cannot be used for the manufacture of parts operating under shock and bending loads, such as plow heaps.

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

The goal is achieved by the fact that steel containing carbon, silicon, manganese, aluminum, titanium and iron contains components, in the following ratio, May. %: Carbon 0.55-0.65

Silicon 0.60-0.90 Manganese 0.50-0.80 Aluminum 0.04-0.1 Titanium0.05-0.15

Iron Resistant

The ductility of the proposed steel is increased by lowering the hardness compared to the known after rolling.

The proposed may contain as an impurity chromium in an amount up to 0.25 wt.%.

Silicon is introduced into the steel in order to increase cross-linkability, hardenability, elasticity, wear resistance and toughness, especially during isothermal hardening. The presence of silicon rose in the amount of 0.600, 90% does not impair the processability of steel and does not increase its tendency to decarburize, while a content of less than 0.60% does not provide the required elasticity and viscosity after isothermal hardening, and the content of more than 0.90% increases C | Loyalty of steel to decarburization.

Manganese is introduced into steel in order to prevent carbon from being emitted with a high content of silicon in graphite form.

The percentage of manganese (0.5-0.8%) was chosen on the basis that its addition in the amount of 0.5% has little effect on the mechanical aging of the steel, and if the content exceeds 0.8%, an increased tendency to increase in grain is observed at heating in the austenitic region, which causes a decrease in toughness.

The chemical composition of the investigated bottoms of the proposed steel is presented in table. one.

.Table 1

0.5 0.15 0.040 0.050

0.6 0.65 0.15. . 0.07 0.10 0.75 0.80 0.18 0.10 0.15 0.90

Else 11

 and

In addition, zinc 0.05-0.2 wt.% And sulfur 0.04-0.15 wt.%

The proposed steel was made in an electric arc furnace with a capacity of 1 t. The ingots were rolled into strips with a thickness of 14 mm (for making ribbons) and 7 mm (for making parts — plow heaps).

The use of heat treatment of isothermal hardening allows to increase the strength characteristics of steel by several times in comparison with the hot rolled state.

Isothermal hardening was carried out according to the following mode: tem perature viscosity

kgsm / cm 2

on samples of 7.7 mm

with a notch of 1 mm

on samples of 10-10 mm

with 2 mm notch

Plastic,

8 arrow deflection, mm

Strength at

Continued table. one

austenization round (900 + 101 ° С, cooling in molten salts at a temperature (280 ± 10fc, holding for 20 minutes), followed by cooling in water (washing).

In this way, it is possible to obtain the entire complex of mechanical properties, tbebekyh for parts operating under conditions of high wear. The mechanical properties of the steel of the investigated heats with a hardness of 52-54 PCs are presented in Table. 2

table 2

1.7-2.5 1.7-2.5

.7

Claims (1)

(541 STEEL containing carbon, silicon, manganese, aluminum, titanium and iron, characterized in that, in order to increase the toughness and ductility, it contains components in the joint, wt.%: Carbon * Silicon Manganese Aluminum Titanium Iron as follows 0.55-0.65 0.60-0.90 0.50-0.80 0.04-0.1 0.05-0.15 Else