SU1067074A1 - Cast iron - Google Patents

Abstract

CAST IRON containing carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, copper and iron, characterized in that, in order to improve wear resistance while maintaining hardness, it additionally contains phosphorus and calcium in the following ratio of compoyens, May. %: 2.3-3.0 Carbon 1.0-2.0 Silicon 0.5-1.5 Manganese 3.0-15.0 Chromium 0.5-3.0 Nickel 0.3-1.5 Molybdenum 0.5-1.5 Vanadium 1.0-2.0 Copper 0.25-0.50 Phosphorus 0,, 03 Calcium Iron Else

Description

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The invention relates to metallurgy, in particular to the development of cast iron for valve seats of an internal combustion engine.

 The known composition of cast iron 1J, containing, wt.%:

Carbon2.5-3.00

Silicon1.5-2.50

Manganese 0.8-1.0 Chromium 3.0-4.0

Phosphorus. Up to 0,2

IronErest

Said cast iron is characterized by insufficient wear resistance. Moreover, its hardness during heating (under operating conditions) decreases sharply, which in turn results in increased wear.

The closest in technical essence and the achieved result to the proposed is cast iron 2 containing, wt.%:

Carbon 2.7-3.5

Silicon0,4-2,0

Manganese 0.2-1.0 Chromium 12.0-20.0

Nickel 0.6-1.5

Copper0,6-1,5

Molybdenum 0.5-1.0 Vanadium2.0-3.0

Titan0,1-1,7

Bor0,1-0,4

Cerium 0.03-0.1

IronErest

However, the specified cast iron with nagrve significantly reduces hardness and does not have sufficient wear resistance.

The purpose of the invention is to increase wear resistance while maintaining hardness.

The goal is achieved by the fact that cast iron containing carbon silicon, manganese, chromium, nickel, molybdenum, vanadium, copper and iron, additionally contains phosphorus and

calcium at s.left ratio of components, wt.%;

2.3-3.0

Carbon

1.0-2.0

Silicon

0.5-1.5

Manganese

3.0-15.0

Chromium

0.5-3.0

Nickel

0.3-1.5

Molybdenum

0.5-1.5

Vanadium

1.0-2.0

Copper

0.25-0.50

Phosphorus

0.01-0.03

Calcium

Rest

Iron

Entering phosphorus provides for obtaining phosphide eutectics in the structure of white cast iron 5, and calcium for the refinement of ledeburitic structure. As a result, the wear resistance of the cast iron and the resistance to the decrease in hardness at elevated temperature are increased. An increase in the phosphorus content beyond the established limit leads to embrittlement of the pig iron, and calcium in the amount of more than 0.03, to the formation of non-metallic inclusions in the castings and their marriage. A decrease in the phosphorus content below 0.25% and calcium below 0.01% does not affect the formation of a Phosphide eutectic — and grinding a grain of 0.5–1.5% V increases the hardness of the phosphate eutectic.

The chemical composition and properties of known and proposed cast iron are presented in the table.

From the above data it follows that the wear resistance of cast iron of the proposed composition is 1.4-2.2 times greater than that of the known. In addition, the decrease in hardness in the pig iron of the proposed composition when heated to 650 ° C occurs more slowly than that of the cast iron, taken as a prototype.

The economic effect from the introduction of the invention is 70 thousand rubles. in year.

2.81.50.813.5 Known Proposed 2.31.00.53.0 2.51.50.88.0 3.02.01.515.0 0.91.62.50.60.9 0.3 0, 51,00,50,3 2,01,51,00,93, 02,01,51,5Products ;; table live

Claims (1)

(57) CAST IRON containing carbon, silicon, manganese, chromium, nickel / molybdenum, vanadium, copper and iron, characterized in that, in order to increase wear resistance while maintaining hardness, it additionally contains phosphorus and calcium in the following ratio of components |, May.%: Carbon 2.3-3.0 Silicon 1.0-2.0 Manganese 0.5-1.5 Chromium 3.0-15.0 Nickel 0.5-3.0 Molybdenum 0.3-1.5 Vanadium 0.5-1.5 Copper 1.0-2.0 Phosphorus 0.25-0.50 Calcium 0.01- ^ 0.03 Iron The rest