SU827551A1 - Slag forming mixture for treatment of cast iron - Google Patents

Description

Soda Ash 10-20

Ferric oxide 10-20

Calcium borate is used technical, containing, weight,%: Bjt0 40-45; CaO 32-37; random commitents n - the rest, its melting point is 1050-1065 C.

The presence of calcium borate in the mixture reduces the melting point of the mixture and slag formation is accelerated, the absorption of boron, calcium and other elements by the raoigave improves, and the paatatyr and modifying capacity is increased.

Calcium borate is dissociated by Saan B, which react with harm: | impurities of mi-sulfur and phosphorus-in metal with the formation of compounds that are removed in the slag. In addition, boron and Kalyshch provide grinding of plate graphite and the formation of graphite compact FSFM, ino leads to a significant increase in the strength of iron.

Soda ash in the kolifitvo 10-20% increases the liquid mobility of the rod

Components

desulfurization, favors dephosphorization and ulschesshe mechanical properties of the metal. Iron oxides reduce the viscosity of the slag, contribute to a more youthful removal of impurities.

from metal.

Cryolite contributes to the improvement of the liquid mobility of the slag and its refining ability, improves the removal of non-metallic inclusions from the melt.

The boundary parameters of the slag constituents are determined empirically.

The dry components of formulations 1-5 (Table 1) were mixed and trashed to the bottom of the casting ladle, into which liquid iron was then passed from the fiery furnace — with a temperature of 13001400 ° C. After cooling the cast iron to a temperature of 1310-1320С, they were filled with rolls.

The mixture was dissolved in the ladle in 0.5-1.0 min after filling 1/3 of the casting ladle.

The slag had a melting point of 780-825 C. The amount of the mixed mixture was 0.3-0.5% per ton of liquid melt.

Table 1

Calcium borate Cryolite

Calcined $ a soda

Iron Oxide Datolite Concentrate Manganese Oxide

The physical properties and refining of synthetic slag, as well as mechanical

ten

18 13

20 10 12 17

25 15

the properties of the scrap metal processed by him are given in Table. 2 and 3. Mechanical properties of roll iron niE Strength at break, kg / mm 23-24 25.5-26.1 Flexural strength, kg / mm 34-34.6 36.8, -37.6 Strength that compression, kg / mm 169-174 181-188 Brinell hardness HB

464

473

in the bleached layer at a distance from the surface of the roll barrel, HB A - 20 mm B - 40 mm

Industrial testing of these compounds 25 showed positive results. As can be seen from the table. 2 and 3, after treatment with the mixture, the mechanical properties of the hgun are improved, they are most improved by the treatment with composition N 3: the tensile strength at rupture increases by 35%, the flexural strength is 31%, the 1% purity of compression is 37%, hardness by 10%. For mixtures NN 2 and 3, the increase in prostration is,%: prn rupture 23 and 29, with bending 17 and 22, with compression 15.5 and 35 21.0, hardness 4 and 5.5, respectively.

It was established that in the structure of the metal treated with the mixture described, along with an insignificant amount of lamellar processing by Mixture3, 5-3.6 is 0.55-0.6 with the prototype Described 3.5-3.55 0.5-0.55 mixture

Thus, as a result of lice treatment, the strength limit of 17-31% bending, the limit of the melts described by the mixture containing a gap of 23–35%, the tensile strength

and sulfur in the cast iron is reduced by 0.015%, compression by 15-37%, with increasing hardness

tp 0.08% of non-metallic inclusions at 10-a 4-g 1C, which reduces the consumption of chromium

20%. The mechanical properties of pig iron cuts) per 1 kg / t, nickel and 3.8 kg / t. Yomer

489

477

464

464

fita, there is a large number of graphite inclusions of a compact form, which indicates a stronger modifying effect of the proposed mixture and its greater refining ability with respect to sulfur and phosphorus and non-metallic inclusions.

The increase in the properties of cast iron made it possible to reduce the degree of its alloying and to reduce the consumption of alloying elements of chromium and nickel by 12%.

The required level of mechanical properties of roller iron SPHN-62 prn processing mixture of the prototype and described was provided with the following compositions.

Claims (3)

Table 4 IZiLlI Z ZriZJE Table 3. The prototype of the mixture HIEZ: HIIIIIZ 27.9-28.7 26.7-27.4 24-24.8 20.5-21.5 41.5-42.5 38.4-39.2 35.3-36 , 3 31-32,5 205-210 190-198 175-180 157-162 Chemical composition,% 0.5-0.55 0.26-0.31 0.085-0.09 0.85-0.9 1 , 85-1.95 0.48-0.51 0.14-0.25 0.057-0.076 0.75-0.8 1.5-1.55 Formula invented Slag-type casting iron mixture containing cryolite ri calcined soda ash, characterized in that, in order to lower the melting temperature of the mixture, increase its refining ability with respect to sulfur, phosphorus and non-metallic inclusions, turn the mechanical properties of cast iron and reduce the consumption of alloying elements, it additionally contains Calcium borate and iron oxide at the following ratio of components, wt.%: Calcium borate 35-45 Cryolite25-35 Calcium soda 10-20 Iron oxide 50-20 Sources of information taken as a review ee 1. USSR author's certificate N 539078, C 21 C 5/54, 1976, 2. USSR author's certificate N 502041, C 21 C 5/54, 1976. 3. / BTopCKoe certificate of the USSR And 495365, C 21 C 5/54, 1974.