SU908920A1 - Wear-resistant cast steel - Google Patents

Description

I

This invention relates to the steel industry.

Known steel 1 of the following chemical composition, wt.%:

Carbon 0.7 - 1.1

Silicon 0.4-1.2 Manganese 0.85-1.5 Chrom0.2 - 1.5

Aluminum 0.03-0.06 Yttrium0.02-0, 2

IronErest

A disadvantage of the known steel is low ductility (relative elongation of 5.2%), impact strength (, 2.2 kG-m / cm).

The closest in technical essence and the achieved effect is cast steel wear-resistant steel 2 of the following chemical composition, wt.%: Carbon 0.6 - 1.2

Silicon0,6 - 1,3

Manganese 0.6 - 1.5

Chrome 0.6 - 2.0

Aluminum 0.04-0.07

Rare earth

0.01-0.05

metals

Nickel 0.2 - 1.0

Titanium 0.01-0.05

Iron Else

Known steel composition, wt.%: C-0.9, SiO - 0.95, Mn-1.1, Sch-1.25, Ni - 0.5, Ti - 0.03, REM-0,018 has the following mechanical properties; Tensile strength kgf / mm 127.6 Yield strength kgf / mm 110 Relative elongation,% 6.3 Relative narrowing,% 14.5 Shock viscosity kgf / cm 2.8 Hardness, NB 400 Wear resistance 40-60%

more than steel 1 UPI. 39 The purpose of the invention is to increase the plasticity, impact strength. In order to achieve this goal, calcium, containing carbon, silicon, manganese, chromium, aluminum, nickel, titanium, and iron, was added to calcium in the following ratio of components, wt.%: Carbon. 0.6-1.2 Silicon .0.6-1.2 Manganese 0 Chromium 0.6 2.0 Aluminum 0.04-0.07 Nickel0.2 1.0 Titanium0.01 - 0.05 Calcium .0,0001 - 0.01 Else Iron to 1 Carbon is one of the basic elements that determine the mechanical properties of steel. The proposed steel is high carbon, thanks to which it has high strength and yield strength. Silicon nurtures ferrite and increases its hardness. At concentrations of the order of 1% silicon, the ductility of ferrite is not reduced. Manganese, which forms carbides, increases the strength of steel. Chromium increases the stability of ferrite, forms strong carbides, and contributes to the grinding of grain. Thanks to chromium, the strength and hardenability of steel is increased. Aluminum acts as a deoxidizer and modifier in steel. Nickel increases the strength of ferrite and increases hardenability. Titanium crushes the structure and increases strength haElements, wt.% Steel I Si I Mn I Cr J L1 1

Known

0.95 1.1 1.25 0.055 0.018 0.5

0.9

0.62 0.63 0.041 0.95 1.05 1.23 0.055 1.29 1.5 2.0 0.07

Fe

0.03

Rest

0.01 0.0001, 03 0.006, 05 0.01 - acting. Introducing calcium increases plasticity and viscosity of the flock and reduces its cost. The proposed composition of the steel taught by the method of fractional melting (Table 1). Steel casting is carried out in dry molds from a core mixture. The physicomechanical properties of the predicted and known steel are presented in table 2. As can be seen from the table, the toughness and ductility of the proposed steel is higher than that of the known steel, while maintaining other properties at the same level. Products made of the proposed steel have wear resistance under conditions of shock-hydro-abrasive wear. Experimental testing of parts made from; The proposed steel showed that their service life is at the same level in comparison with similar parts made of known steel, but at the same time the cost of steel and CTofiKocTb decreases 1.5-2 times higher than the same parts made in now from steel 35HGSL. The expected economic effect from the use of the proposed steel for the manufacture of working bodies, for example, hydraulic elevators and dredging pumps operating at the Orotukansky mining equipment plant, will amount to 200-250 thousand rubles. Table I I REM I NiTiСа

T a b l and c a 2

and iron, characterized in that, in order to increase ductility and toughness, it additionally contains calcium in the following ratio of components, wt.%:

Carbon 0.6 -1.2

Silicon 0.6 -1.2

Calcium 0.0001 - 0.01

IronErest

Sources of information taken into account in the examination

1. USSR author's certificate No. 395492, cl. С 22с 38/18, 1973.

2. The copyright certificate 711156, c. C 22 C 38/50, 1.978.

Claims (1)

Claim Cast wear-resistant steel containing carbon, silicon, manganese, chromium, aluminum, nickel, titanium and iron, characterized in that, in order to increase ductility and toughness, it additionally contains calcium in the following ratio of components, wt.%: Carbon 0.6 - 1.2 Silicon 0.6 -1.2 Manganese 0.6 1,5 Chromium  0.6 2.0 Aluminum 0.04 0,07 Nickel 0.2 1,0 Titanium 0.01 0.05 Calcium 0.0001 - 0.01 Iron Rest