SU899704A1 - Steel composition - Google Patents

Description

The invention relates to metallurgy, in particular to casting steels, and can be used for the manufacture of armor plates for grinding mills operating under conditions of intense abrasive wear in the presence of shock loads.

Closest to the invention is steel 13, containing, by weight. %:

0.15-0.62

Carbon

Aluminum 0.005-0.1 0.35-1.2

Silicon

Nitrogen O, OO5-O, 05 0.2-2

Manganese

0.005-0.1

Lantan

3.2-7.5

Chromium

Calcium

0.001-0.08

0.2-0.8

Nickel

Magnesium

0.001-0.05

Molybdenum

1.2-2.5

Vanadium

0.2-1.2

Rest

Iron

The disadvantage of this steel is low strength, toughness, resistance (54) STEEL

kslggy in the abrasive environment and at shock-abrasive wear.

The purpose of the invention is to increase strength, toughness, durability in an abrasive environment and in shock-abrasive wear.

This goal is achieved by the fact that steel containing carbon, chromium, manganese, nickel, vanadium, nitrogen, calcium, magnesium and iron, additionally contains cerium in the following ratio of components, wt. %:

Carbon

0.6-0.8

5-9.5

Chromium

2-4

Manganese

0.3-1.5

Nickel

0.1-0.6

Vanadium O, 03-O, 15

Nitrogen 0,001-0,01

Calcium 0.001-0.01

Magnesium 0.05-0.25

Cerny Else

Iron

The chemical composition of the steel is given in table. one.

Fvziko-mechanical properties of steels are given in table. 2

Strength and plasticity at stretching, impact dough on the Menage, abch is racy resistance in sand, clinker,

coal, ore, wear resistance under the friction of metal on metal were investigated after storage during normalization from EOO-CZBO S AND tempering at 200-700С. The study of macro-microstructure, phase composition.

In tab. Figure 2 shows the averages of 5 parameters of the properties of the investigated steels after austenitization from and tempering at. Such a heating temperature for quenching or during normalization ensures the complete transformation of austenite, the dissolution of carbides and nitrides, but does not cause; eosta austenitic grain. Leave over allows the steel to be overdone somewhat to improve toughness with a slight decrease in strength.

When casting on large complex Nehondzi-Kuptsov samples, casting has been studied. the characteristics of this steel. At pouring temperatures of 1530 - 1560 - ISGO C, the fluidity is 590 64О - 68О mm, the foundry shrinkage is 2.3 2, 35 - 2.40 mm, no cracks are found. At these temperatures, the fluidity and linear shrinkage of the known steel are the same as the cracks in the samples not. Good casting properties make it possible to obtain high-quality, non-defective castings of armor-grade materials.

The macro and microstructures, mechanical properties over the cross section of castings in different states were studied (Table 3). Research results are shown in. 3

In this connection, all experienced armor plates are quenched in oil after heating to 110 ° C-1060 ° C and released at 590 UB.

The uniform hardness over the section of armor plates of the proposed steel, a dense structure without rift and cavities, high strength and impact strength have led to high resistance to wear, lack of smth and tears of all layers, starting from the surface. As a result, cement-grinding mills with armor-lining states of the proposed steel without repair worked for 53 months.

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Claims (1)

N 11 89970. Claims of Invention. Steel containing iron, carbon, chromium, nickel, manganese, vanadium, nitrogen. Sapygai, magnesium and iron, so that with the aim of higher-5 nn of strength, toughness, durability in an abrasive environment and with a shock-abrasive installment, it additionally keeps cerium in the following ratio : nki components weight. %: O Carbon 0.6-O, 8 Chromium 5, O-9.5 412 Manganese 2, O-4.0 Nickel 0.3-1.5 Vanadium 0.1-0.6 Nitrogen 0, OZ-O, 15 Calcium O, 001-O, 0l Magnesium 0.001-0.01 Cerium 0.05-0.25 Iron Else Sources of information taken into account during the examination 1. USSR author's certificate No. 508560, cl. C 22 C 38/22, 1976.