Cast steel

Details Cast steel Cast steel

1989-04-07

1990-05-29

Yee, Deborah

Alloys or metallic compositions

Ferrous

1.7 percent or more carbon containing

420 15, 420 56, 420 40, 420 74, C22C 3838

Patent

active

049294164

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE ART

The present invention relates to metallurgy, and, more specifically, to cast steel, which can be used for the manufacture of cast parts of ore-dressing machines, jaw-type, cone, rotary, and hammer crushers, linings of ore discharging chutes, grinding mills and other members of crushing-grinding and metallurgical equipment, operating under conditions of an intensive shock-abrasive wear with high contact loads of a shock character.


Prior Art

Known in the art is wear-resistant pig iron /SU, A, 393350/ containing /% by mass/:


______________________________________ carbon 2.5-3.8 silicon 1.1-3.5 manganese 5.5-12.0 chromium 1.5-4.0 boron 0.05-0.3 titanium 0.1-0.2 iron the balance. ______________________________________
This pig iron can be employed for the manufacture of parts operating under abrasive wear conditions.
Said pig iron, however, is characterized by the presence of silicide segregation /mostly at the grain boundaries/ and large-size inclusions of hypereutectic carbides because of the high content of carbon and silicon, sharply lowering its impact elasticity and making the metal more brittle. In this connection it cannot be employed for the production of parts operating under shock-abrasive wear conditions.
Known in the art is also an alloy /SU, A, 498350/, which is used for the same purpose and contains /% by mass/:


______________________________________ 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 the balance. ______________________________________
This alloy is sufficiently wear-resistant under abrasive wear conditions in the presence of impact and contact pressures.
However, a considerable amount of large-size carbides and borides as eutectic components present in the structure of the alloy (even in the case of a uniform distribution thereof), as well as the formation of large-size primary grains significantly lower the level of its impact elasticity, thus resulting in a rapid destruction of castings.
Known in the art is a wear-resistant cast steel /SU, A, 587170/, containing /% by mass/:


______________________________________ carbon 2.5-3.2 chromium 9.0-10.8 silicon 1.2-2.4 manganese 11.0-15.0 cerium 0.001-0.2 vanadium 0.15-0.3 iron the balance. ______________________________________
This steel can be employed in the production of heavy-duty wear-resistant members of metallurgical and mining equipment.
However, the presence of a hardening phase of M.sub.7 C.sub.3 type, which has an elongated shape as needles and a considerable length of interphase boundaries in the steel structure determines a low level of its impact elasticity (not more than 0.064 J/m.sup.2) and nonuniformity of wear of parts, that depends on the angle at which the elongated carbides are disposed to the plane of wear.


DISCLOSURE OF THE INVENTION

It is an object of the present invention to provide a 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.
This object is accomplished by providing a cast steel, containing carbon, silicon, manganese, chromium, cerium, vanadium and iron, which, according to the present invention, additionally contains titanium, aluminium, and boron at the following ratio of the components /% 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 0.05-0.3 aluminium 0.05-0.15 boron 0.005-0.015 iron the balance. ______________________________________
The steel according to the present invention is characterized by a homogeneous austenitic structure with a hardening disperse phase in the form of carbides, carbonitrides, and the like, which is uniformly distributed within the matrix volume thus imparting to the steel a high wear-resistance in the presence of dyn

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