SU498350A1 - Cast iron - Google Patents

Description

(54) CAST IRON

The invention relates to the field of metallurgy, in particular to the search for cast irons used for the manufacture of parts operating under conditions of active abrasive wear, including in aggrega- tions in the presence of high impact loads and contact pressures, for example, lining ball and rod grinding mills, lining ore passes, parts of slurry pumps, disks of sorting grids, parts of ore-dressing machines, etc.

Known cast iron following chemical composition, weight. %:

4.0-6.0

1.5-3.5

12.0-15.0

10.0-15.0

0.3-1.0

Up to 0.1

Rest.

The known cast iron is smelted in furnaces and is intended for the casting of any grinding bodies. It has an austenitic structure with a large variety of carbides.

Cast iron has the following properties: Tensile strength at bending, KzlMM 55.2

Deflection arrow

distance between supports

300 mm, mm Hardness, HRc

However, the known cast iron, which has high hardness, does not have plasticity. In an abrasive environment without shock loads, the wear resistance of cast iron is high, but for parts such as linings of grinding mill mills, discs, sorting grids and others operating under abrasive conditions under high impact loads and contact pressures, such cast iron is not applicable due to its low ductility. 1, parts made of it are destroyed at the very beginning of the operation of the unit.

In order to increase the plasticity and wear resistance under the conditions of impact abrasive wear, the proposed cast iron is distinguished by a lower carbon content in the next component weighting, weight. %:

Carbon 1.6-3.0

Silicon0.15-2.0

Manganese5.0-15.0

Chrome5.0-12.0

Bor0,1-0,5

Titan0,2-1,0

Claims (1)

Iron Else. 3 Cast iron in a cast state has the following properties: Flexural strength, kg / mm 106.8 Strength bar with a distance of 300 mm between supports, ML1 6.9 Hardness, HRc 36 Structure - 45-65% of solid phases (com plex carbides, titanium compounds with boron, carboborides), 10–20% doped austenite, the rest martensite. T1ve inclusions: PFDs have a microhardness of 140Q-Q20Q kg / mm and are evenly distributed in a viscous, durable and plastic austenitic-martensitic matrix. 4 Invention claim Cast iron containing carbon, silicon, manganese, chromium, boron, titanium and iron, characterized in that, in order to increase ductility and wear resistance under conditions of wear and abrasive wear, its components are taken in the following ratio, weight. %: Carbon 1.6-3.0 Silicon 0.15-2.0 Manganese 5.0-15.0 Chromium 5.0-12.0 Boron 0.1-0.5 Titanium 0.2-1.0 Iron Else