SU1076484A1 - Cast iron - Google Patents

Abstract

CAST IRON containing carbon, silicon, manganese, antimony, molybdenum, iron, characterized in that, in order to increase abrasive wear resistance and corrosion resistance, it additionally contains titanium, tin and phosphorus in the following ratio of components, wt.%: Carbon 3.2- 3.40 Silicon1.6-3.0 Manganese 0.005-0.04 Antimony0.05-0.14 Molybdenum 6.1-0.4 Titanium 0.3-0.55 Tin0.15-0.33 Phosphorus0.1- 0.6 Iron Else

Description

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4 00 4

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

Known cast iron tl L containing wt.%:

Carbon3.38-3.86

Silicon 0.32-3.03

Manganese 0.54-1.07 ChromeDo 0.8

Nickel to 2,3

Molybdenum Do Oh, 3 Cerium 0,016-0,89

IronErest

The closest to the proposed results achieved is cast iron 2.}, containing, wt.%: Carbon 3,0-3,40

Silicon1,6-2,20

Manganese 0.005-0.04 Sulfur 0.08-0.10

Antimony 0.05-0.14

Molybdenum 0.1-0.40 IronEstal

A disadvantage of the known cast iron is its low resistance under the conditions of an aggressive hydroabrasive environment.

The purpose of the invention is the development of abrasive wear resistance and corrosion resistance.

This goal is achieved by the fact that cast iron containing carbon, silicon, manganese, antimony, molybdenum and iron additionally contains titanium, tin and phosphorus in the following ratio, wt.%: Carbon 3.2-3.40 Silicon 1.6- 3.0 Manganese 0.005-0.04 Antimony 0.05-0.14. Molybdenum 0.1-0.4

Titanium 0.3-0.55 Tin 0.15-0.33 Phosphorus 0.1-0.6 Iron Else As an impurity, iron contains 5 sulfur to 0.05%.

Each of the additionally introduced elements has a different effect on the crystallization process and, therefore, on the structure and properties of the material. Phosphorus increases the activity of carbon in the melt, reduces the Cree (the tical size of the earbud during eutectic crystallization, which contributes to the grinding of grain. The simultaneous presence of phosphorus and antimony in the iron leads to the formation of complex phosphide-antimony eutectic, evenly distributed in the structure. Tin is a strong perlithizer, increases the dispersion of the eutectoid and increases its microhardness. Increasing the hardness of cast iron due to grinding of the eutectic grain, the presence in the structure of phosphorus Antimony eutectics, an increase in the dispersion of the eutectoid, have a positive effect on the abrasive wear resistance of the material.Titan, alloyed the metallic base of cast iron-ferrite and eutectoid cementite, has a favorable effect on its corrosion resistance.

Example. Dp of studying the properties of the proposed material melt the cast irons of three compositions containing basic kits at three levels: low, medium and high, as well as a well-known alloy with an average level of ingredients.

The test results are presented in Table. one.

Table 1

Cast iron is melted in a 50 kg induction furnace with an acidic lining. Metallized pellets of silicon, molybdenum, titanium, phosphorus, sulfurous iron, and also crystalline antimony and tin, are used as a charge for the production of low manganese iron. The process of introducing phosphorus, tin, and titanium into cast iron consists of melting the charge, calculated by taking into account the preparation of the material of the required composition, Ferrrphosphorus (18% P) and ferrotitanium (30% Ti) are loaded into the furnace along with the main charge.

Crystalline tin is introduced into the liquid melt before pouring the mold. The amount of additives is calculated from the average absorption of phosphorus and tin at the level of 85-95%, titanium 80-85%,

Samples are poured into sukhus sand form. Tests for abrasive wear resistance are carried out on the friction machine by moving the sample along the surface of the carbonitride abrasive

0 material, corrosion tests carried out in a 3.0% solution of Bordeaux fluid at 50 s,

The test results are presented in Table 2;

table 2

Claims (1)

CAST IRON containing carbon. Silicon, manganese, antimony, molybdenum, iron, characterized in that, in order to increase abrasive wear resistance and corrosion resistance, it additionally contains titanium, tin and phosphorus in the following ratio of components, wt.%: Carbon 3.2-3.40 Silicon 1.6-3.0 Manganese 0.005-0.04 Antimony 0.05-0.14 Molybdenum 0.1-0.4 Titanium 0.3-0.55 Tin 0.15-0.33 Phosphorus 0.1-0.6 Iron Rest