NINGBO TIANCHENG NON-FERROUS METAL PRODUCTS CO.,LTD.
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Iron and steel casting manufacturer

It is an object of the present invention to provide a Steel Castings cast steel featuring a high wear-resistance under the conditions of a shock-abrasive wear at high contact loads of an impact character and having a high impact elasticity, while retaining sufficiently high mechanical and casting parameters.

The above specified composition ensures an enhanced wear resistance under predominantly wear in the presence of insignificant impact loads.

BEST WAY OF CARRYING THE INVENTION INTO EFFECT

Casting of the steel according to the present invention is conducted by the known processes in electric furnaces with a basic lining, envisaging the use of a fresh charge in the form of both ferroalloys and wastes of carbon steel, high-manganese, and chromium steels.

A furnace is charged in the following order: waste and recycling materials are the main charge; ferrochromium is charged after smelting; ferromanganese; ferrovanadium; deoxidizers--silicon, aluminium; modifiers--titanium, boron, cerium.

Before casting the steel is held in the melting furnace under white (aluminous) synthetic slags.

According to the present invention steel can be produced also by processes of electric-slag and vacuumarc remelting.

The resulting cast steel has the following composition (% by mass): carbon 1.6-3.0 silicon 1.2-1.6 manganese 11.0-15.0 chromium 9.0-10.8 cerium 0.001-0.2 vanadium 0.15-0.3 titanium 0.05-0.15 aluminium 0.05-0.15 boron 0.005-0.015 iron the balance.

The steel according to the present invention, in comparison with the known wear-resistant steel (SU, A, 587170), under the same test conditions at substantially equal strength characteristics and sufficiently high plasticity is characterized by an increase of its shock-abrasive wear-resistance by 50-80% by mass and impact elasticity by 2.5-2.8 times without changes in the casting parameters (fluidity and linear shrinkage). These parameters make it possible to employ said steel for the production of large- and small-size shaped castings of a broad assortment: working members, parts and assemblies of crushing-grinding, mining, ore dressing and metallurgical equipment,Aluminum Castings operating under severe conditions of shock-abrasive wear in the presence of considerable contact loads of a shock character.

The high parameters of wear-resistance and impact elasticity of the steel according to the present invention result in a reduced consumption of the subject to wear replaceable units of mining and ore-dressing equipment; they also increase its reliability and extend its service life. The steel is characterized by a high crack-resistance upon casting. Thin-walled castings from this steel can be produced without increments.

There are no critical components in the composition of the steel according to the present invention.