SU1252382A1 - Cast iron - Google Patents

Description

The invention relates to metallurgy, in particular, to the development of cast iron compositions for castings operating under conditions of cavitation and hydroabrasive wear in aggressive media.

The aim of the invention is to increase wear resistance in cavitation and hydroabrasive wear in aggressive environments.

The introduction of aluminum, vanadium and cobalt into the composition of the proposed cast iron significantly increases the wear resistance of cast iron during hydroabrasive and

In addition, aiadi carbides, which are the leading phase during crystallization, eliminate ledeburit, promote grain refinement, which also improves cavitation resistance.

ten

Cobcit, introduced into the iron in an amount of 0.05-4.0 wt.%, Contributes to an increase in hydroabrasive resistance and cavitation due to the fact that it reduces the critical quenching speed (increases hardenability), and to release hardening phases during tempering (microhardness decreases). cavitation wear. (aluminum content). The presence in the cast iron mini 0.01-0.05 May.% In the composition of residual austenite, the guna is severely impaired, and the anticorrosive properties of the white casting and cavitation properties increase it. He refined alloyed iron.

Cast iron, removes oxides and nitrides. Cobalt and aluminum increase marten, which are corrosion concentrators, reduce ductility and, as a result, cavitation resistance. An aluminum content of more than 0.05% by weight makes it difficult to produce cast iron without being contaminated with oxides of a to tni.

Vanadium (0.3–5.5 wt.%) Increases the wear resistance of cast iron during hydroabrasive wear by changing the shape of primary carbides (included in the composition of carbides) and increasing the alloying of the wear resistance when the substrate is cavitated with chromium (redistributive and hydroabrasive). no chrome wear between carbide and base). in the medium of sugar syrup at 40 C.

.- 20

25

sieve point and reduce the amount of residual austenite, thereby increasing the hydro-abrasive and cavitation resistance.

The chemical compositions of the known and proposed cast iron, as well as their properties are presented in the table.

As follows from the table, the additional input B the composition of iron vanadium, aluminum and cobalt provides

2.2 o, in “. About 22.0 e, 015 4.0 3.0 1.0 4.0 Ostal- 1.25

some

2.2 O. f, o g.o e.ots e.g., 5 o.s 8.0, 62.51.5 gb.O0, OS 5.59.04.06. .80.3O.Sti, e0.01 0.30.10.050. , 82.81.72в, 00,10 .0105.06. .0.20,116,00,005 O.i 0,030,250. .thirty

2.10

1.75

2.50

2.20

Please note. Sostvvy 7 and in the well-known cast iron contain But in the amount of 2.8 and Ias.1

VNIIPI Order 4591/29 Circulation 567 Subscription Proizv.-poly. pr-tie, Uzhgorod, st. Design, And

In addition, aiadi carbides, which are the leading phase during crystallization, eliminate ledeburit, promote grain refinement, which also improves cavitation resistance.

. Cobalt and aluminum increase marten-30 by increasing the wear resistance at cavitation and hydroabrasive wear in the medium of sugar syrup at 40 C.

20

25

sieve point and reduce the amount of residual austenite, thereby increasing the hydro-abrasive and cavitation resistance.

The chemical compositions of the known and proposed cast iron, as well as their properties are presented in the table.

As follows from the table, the additional input B the composition of iron vanadium, aluminum and cobalt provides

19.00.0030.29

20.50.0020.

24.50.0250.29

22.40.0150,66

27.50,0350.27

26.00.0300.40

Claims (1)

CAST IRON containing carbon, silicon, manganese, copper, nickel, chromium and iron, characterized in that, in order to increase wear resistance during cavitation and hydroabrasive wear in an aggressive environment, it additionally contains vanadium, aluminum and cobalt in the following ratio of components , May.%: Carbon 1.8-2.6 Silicon 0.3-2.5 Manganese 0.5-1.5 Chromium 18-26.0 Nickel 0.1-9.0 Copper 0.3-6.0 Vanadium 0.3-5.5 Aluminum 0.01-0.05 Cobalt 0.05-4.0 Iron Rest