SU735653A1 - Steel - Google Patents

Description

(54) STEEL. The invention relates to metallurgy and mechanical engineering and can be used in the manufacture of the basis of steel-iron bimetallic products. The 4OL steel is known, on the basis of which steel-cast iron bimetal of increased structural strength is obtained. However, on the basis of this steel it is impossible to produce steel-cast iron bimetal with increased ductility of the cast iron layer, in particular, due to the formation of high-strength pig iron in the bimetal. Closest to the invention to the technical essence and the achieved effect is steel 2, containing wt.%: Carbon0.0 8-0.14 Silicon0.8-1.1 Manganese1.4-1.85 Bor0.002.-0, O04 Calcium0, O4-0, O8 IronEstal. Known steel is characterized by an increased level of structural construction, cold resistance, impact toughness and ductility in a state of thermal improvement. In the supply state, the steel is characterized by a low level of toughness. However, steel-cast iron obtained on the basis of the known steel bimetal is characterized by low structural strength and ductility of the cast iron bimetal layer, the relative elongation is close to zero. The aim of the invention is to reinforce toughness, structural strength, plasticity, obtained on the basis of steel steel-pigment bimetal. This is achieved by the fact that the proposed steel additionally contains magnesium in the following ratio of components, wt.%: Carbon 0.08-0.16 Crtnium0.80-1.1 Manganese0.90-1.5 Boron0.001-0.004

Calcium0,002-0,05

Magnesium0, OO1-0,04

Iron

The introduction of magnesium into steel contributes to an increase in its toughness and also allows to obtain steel-cast iron of increased ttasticity on the basis of this steel with a cast-iron layer of high-strength cast iron due to the fact that magnesium contributes to the formation of globular graphite in the latter.

The steel melting heads were cast, on the basis of which steel bimetal was obtained.

. .i

The chemical composition of the experimental steels is presented in table. one.

Tablipa

When Vshlavka steel used its processing in a casting ladle with synthetic slag. Boron, calcium, magnesium are introduced into the steel simultaneously in the ladle during the process of purging it with argon. Processed with synthetic slags, argon with boron, calcium and magnesium, liquid steel is poured into a casting housin with graphite heated to 84 ° C. core and cooled with the furnace to room tetrapperaty.

redlag

Steel 1, bi-12/34 / steel-steel, cast iron based on it

Steel 2, bi-11.6 / 35 / metal steel-iron based on it

The resulting bimetallic steel-iron sleeves are cut into specimens on which mechanical properties are tested.

The mechanical properties of steel (numerator) and cast iron (denominator). Steel-cast steel, obtained on the basis of the corresponding steel, are presented in table 2.

table 2

47/46

160

19/6

48/45

155

18/4

Steel 3, bimetal steel-iron based on it

Known

Steel bimetalp stshugugun ka its base

As the conditional structural strength of bimetal steel-cast iron, the averaged values of the tensile strength and relative elongation of the steel and cast-iron bimetal layers are taken.

The test results showed that the impact strength of the proposed steel increased by more than 60%.

The proposed steel is used as a steel-cast iron base for bimetal, leading to an increase in its structural strength of more than 1.5 times. In particular, the strength t of the iron layer of the bimetal increases by more than 2 times, and the relative elongation from zero to 4-6%.

The application of the proposed steel, the production of bimetallic steel-iron products will contribute to increasing their reliability and durability;

The proposed steel can be used in the manufacture of bimetallic steel-cast iron products, such as diesel sleeves, pistons, piston rings. The sleeves of increased structural strength contribute to

Continued table. 2

15O

20/6

46/43

34/17/0

10A

49/22

33 / resource exploitation of diesel engines and their efficiency.

20

Claims (2)

1. USSR author's certificate number 579098, cl. B 22 D 19 / GS, 1975. 2. USSR author's certificate No. 631555, cl. C 22 C 38/04, 1977.