SU1109460A1 - Cast iron - Google Patents

Abstract

CAST IRON containing carbon, silicon, manganese, aluminum, cerium and iron, characterized in that, in order to increase the fluidity and reduce the tendency to frot formation during raw sand casting, it additionally contains copper in the following ratio of ingredients, May. %: Carbon2.5-2.8 Silicon1.8-2.5 Manganese 0.3-0.7 Aluminum 0.05-0.10 Cerium0.02-0.15 Copper0.4-0.8 IronEstal

Description

with

NJ

a The invention relates to foundry production and can be used in the smelting of iron based on metallized pellets. Known cast iron f1 j of the following cic composition, wt.%: Carbon3.3-338 Silicon2.1-2.6 Manganese0.3-0.8 Phosphorus0.05-0.20 Chromium 0.1-0.5 Nickel. 0.05-0.50 Titanium0.001-0.300 Aluminum 0.001-0.100 Bor0.005-0.080 Copper0.1, -0.6 IronErestalny However, this cast iron has a low strength due to a higher carbon content in it. The technical essence and the achieved result is cast iron 1,2J, which has the following chemical composition. %: Carbon 3.2-3.6 Silicon 1.9-2.2 Manganese 0.2-0.4 Aluminum. 0.5-1.0 Cerium 0.01-0.05 Magnesium 0.03-0.07 Iron, Else However, the known cast iron has a relatively low fluidity and a high degree of formation of the melt during the casting of wet sand molds. The aim of the invention is to increase the fluidity and decrease from foaming to form in wet sand forms. This goal is achieved by the fact that cast iron containing carbon, crhenium, manganese, aluminum, cerium and iron, additionally contains copper in the following ratio ingredie tov, May. %: Carbon 2.5–2.8 Silicon1.8–2.5 Manganese 0.3–0.7 Aluminum 0.05–0.10 Cerium 0.02–0.15 Copper 0.4–8.8 IronOld Cast Iron as impurities contains May %: Phosphorus Up to 0.05 Sulfur To 0.08 Entering into the composition of the cerium and alminium alloy enhances the graphitizing effect during the eutectic transformation, in connection with which the chill iron value decreases by 1.5-2.0 times. At the same time, the strength of the alloy increases as well, which is a consequence of the Tr of the shape of the graphite inclusions and their more uniform distribution. The lower and upper limits of the content of cerium and aluminum are due to the effectiveness of the influence of these elements on the amount of chill and the mechanical properties of cast iron. The proposed cast iron has a lower carbon content (2.52, 8 May.%) Compared with the known, additionally alloyed with copper (0.40, 8 May.%), Has a lower concentration of aluminum (0.05-0.1 wt. .%) it lacks magnesium. In addition, the proposed cast iron is classified as gray, i.e. . graphite has a predominantly lamellar form, while in the known form it is spherical. These differences in chemical composition provide higher technological properties, in particular fluidity and less prone to the formation of captivity. This makes it possible to produce complex structural castings from this cast iron during molding at the automatic molding line. In tab. 1 shows the technological properties of the proposed iron compared to the known. The fluidity is determined by vacuum suction into a quartz tube with a diameter of 2.6 mm. The tendency to film formation is estimated visually as the ratio of the area captured to the full surface of the fracture when casting into raw sand forms of 10x10x55 mm in the amount of 100 pieces for each composition. Magnesium is introduced into a known alloy in the form of a silicon-magnesium ligature. PRI me R. The smelting of alloys of the proposed composition can be carried out both in arc and induction electric furnaces. In this case, the LPZ-67 high frequency induction furnace is used. Metallized pellets containing 82.0% Fe, 75.0% Fe, 2.0% C are used as charge materials; the return of own production, which is a Fe-C-Si alloy, smelted from pellets and containing 3.5-4.0% C; cast iron and other scrap. Obtaining the required concentration of carbon in the cast iron is achieved with varying the composition of the metal dumping. The content of silicon, manganese, and copper is refined by addition of crystalline silicon, electrothermal manganese, and cathode copper to a liquid bath. Before casting, the alloy is microlegated with ferrocerium and aluminum. Samples for the preparation of samples for mechanical tests are cast in sand form. A 110x50x9 mm sample to determine the tendency of the pig iron to chill is cast in a sand form with cooling a large rib on a steel plate. According to this technology, 5 compositions of the proposed alloy are melted (on the lower, middle, upper, as well as below the lower and higher content of the 1-go compone) and the known alloy. Indicators of strength and tendency to chill out of these alloys are presented in table. 2. The technology for producing the proposed pig iron consists in melting the charge consisting of metallized metals and returning its own production, fine-tuning the cast iron by chemical composition, micro-alloying with cerium and apyumine, and casting into molds. The proposed cast iron can be used in the production of critical castings with different wall thickness. The expected economic effect is 43,000 rubles (applied to a foundry with a capacity of 5,000 tons per year). Table 1

2.0 0.3 - 0.03 0.75 0.05 Else 115

1.58 0.12 0.1 0.0 0.01 1, 8 0.3 0.4 0.02 0.05 -.

2.65 2.2 0.53 0.6 0.07 0.07 2, 8 2.5 0.7 0.8 0.1 0.1 0.1 3, 2 2.93 1.1 1.2 0, 3 0.2 Cast iron

1.5

115

Table2 Content of elements. Mae. %

 , 07 Remaining 562-592

y

Continued table. 2

3-7

.14,0

305 306

3.0 396

2.0 378

3.3

314

12.0

Claims (1)

CAST IRON containing carbon, silicon, manganese, aluminum, cerium and iron, characterized in that, in order to increase fluidity and reduce the tendency to foil when casting in raw sand forms, it additionally contains copper in the following ratio ingredients, may. %: Carbon 2.5-2.8 Silicon 1.8-2.5 Manganese 0.3-0.7 Aluminum 0.05-0.10 Cerium 0.02-0.15 Copper 0.4-0.8 Iron Rest g ω s * "A 1 1109460