SU885332A1 - Steel - Google Patents

Description

(5) STEEL

I

The invention relates to metallurgy, in particular to the search for steels for the manufacture of castings of increased reliability and durability.

Known steel Dl of the following chemical composition, weight:

Carbon 0.12-0.25

Manganese 0.7-1.5

Silicon0,2-0,65

Chrome 0.1-0.35

Vanadium. Q ,, S Titan 0,015-0,

Aluminum 0,015-0,06

Cerium 0,01-0,1

Calcium0.007-0.07

Nickel 0.05-0, i

Copper0.05-0, i

IronErest

The disadvantage of steel is low impact strength.

The closest in technical essence and the achieved effect to the proposed is steel 2 of the following chemical composition, wt.%:

Carbon 0.12-0.25

Silicon0,2-0,6

Manganese, 6-1, 7

Chrome 0.03-0.45

Vanadium 0.03-0.16

Aluminum 0.01-0.08

Nickel 0.03-0,

Copper0.03-0.15

Magnesium0.002-0.05

IronErest

ten

This steel with casting properties satisfies the requirements for responsible casting. A disadvantage of the known steel is low wear resistance and impact

15 viscosity at low temperatures.

The purpose of the invention is to increase wear resistance and toughness at low temperatures.

This goal is achieved by

30 that the steel containing carbon, silicon, manganese, chromium, vanadium, aluminum, nickel, copper, magnesium and iron, additionally contains niobium and titanium, with

the following ratio of components, wt.%: 0.18 0.3 b2 0, 0.12 0.2 0.6 0.03 "0.25 0.6 1.7 O, 15 0.2 0.4 1, 3 0.28

Wear resistance is determined by comparison with steel 20 FL. Weldability is assessed according to GOST 13585-68. When welding the proposed steel, the absence of welding cracks is noted. The proposed steel has the following set of mechanical properties:

Yield strength

kgcm / cm

Tensile strength,

CMF / CM 60-66

Relative elongation,% 23-28 Relative narrowing, (The use of the proposed steel for casting critical parts will increase their wear resistance, impact strength.

853324

and the nitrides of these elements are still formed in the liquid steel and during its crystallization contribute to the grinding of the cast structure. This increases wear and toughness and toughness.

The content of titanium and niobium below the lower limit is ineffective, and above the upper limit does not contribute to further improving the properties of steel

10 and leads to some decrease due to the formation of excess carbide and nitride phases at the grain boundaries.

Chemical composition and mechanical

15 properties of the proposed and famous steel are given in the table.

durability by 2i% and get the annual economic effect of p.

Claims (2)

Invention Formula Steel containing carbon, silicon, manganese, chromium, vanadium, aluminum, nickel, copper, magnesium, and iron, characterized in that, in order to improve wear resistance and toughness at low temperatures, it further contains the ratio of components, wt.%: Carbon 0.12-0.25 Silicon0,2-0,6 Manganese 0.6-1.7 Chrome 0.03-0.5) Vanadium 0.03-0.16 Proposed 0.1 0.030.25 0.15 0.01 O, Oft 0.02 12 7.76.0 b. 0.03 0.01 0.03 0.03 0.002 P, 02 0.01 13.6 8.2 5.2 5.6 0.16 0.08 0, 0.2 0.05 0.06 O, Oil 8.8 7.2 5.6 5.8 Known 0.1 0.03 0.3 0.15 0.01 - - 8 6.7. 5 Aluminum 0,01-0,08 Nickel 0,, 45 Copper 0,, 20 Magnesium 0,002-0,05 Niobium 0,02-0,06 Titanium 0,010-0,014 IronEverything else 8853326 Sources of information. taken into account during the examination 1. USSR author's certificate M52618t, cl. C 22 C 38/50, 1976. 5 2. USSR author's certificate in application number 2b90511 / 22-02, class C 22 C 38 / + 6, 1978