SU1500693A1 - Iron innoculator - Google Patents

Description

The invention relates to ferrous metallurgy, in particular to the development of compositions of modifiers for the production of gray iron. The purpose of the invention is the increase in fluidity

The invention relates to ferrous metallurgy, in particular to the development of compositions of modifiers for gray iron.

The aim of the invention is to increase the fluidity of cast iron, improving machinability while maintaining a high level of mechanical properties.

The modifier containing silicon, aluminum, calcium, zirconium, strontium, rare earth metals, titanium, iron, additionally contains manganese, carbon and niobium in the following ratio, wt.%:

Silicon 60-75

Manganese 3-8

2

cast iron and improved machinability while maintaining a high level of mechanical properties. The modifier contains silicon, aluminum, calcium, zirconium, strontium, rare earth metals, titanium, manganese, carbon, niobium, iron in the following ratio of components, ma.l: cream-. 60-75; aluminum 0.1-2; calcium 0.1-2; zirconium 3-8; strontium 0.1-2; rare earth metal 0.1-2; titanium 0.03-1; manganese 3-8; carbon 0.03-5; niobium 0.05-2; iron else. The addition of manganese, carbon, and niobium to the modifier makes it possible to increase the fluidity and workability by 1.5–2 times to <s while maintaining a high level of mechanical and technological properties. 2 tab.

Aluminum. Calcium Zirconium Strontium Rare Earth Metals Carbon Niobium Titanium Iron

0.1-2. 0.1-2 3-8 0.1-2

0.1-2

0.03-5

0.05-2

0.03-1

Rest

The introduction of manganese and carbon in the modifier causes an increase in the fluidity of the pig iron being processed, the introduction of carbon also leads to an improvement in the workability of the iron by cutting and a decrease in the hardness of the iron.

8 and „„ 1500693 A1

3 1500693

When the content of manganese in the modifier below 3 wt.% Its effect on fluidity is negligible.

When the content of manganese is more than 8 wt,%, the granularity of the modifier deteriorates, and the hardness of the iron increases. The carbon content of less than 0.03 wt.% Is ineffective and unattainable with the coal-thermal method - | d modifier production.

When the carbon content in the modifier is more than 5 wt.% In the processed iron, graphite of unfavorable form is formed, which causes a decrease in the mechanical properties of the iron.

Enter niobium contributes to the early release of graphite, improving the technological properties of cast iron. '

Niobium in quantities less than 20

0.05 wt.% Has an insignificant effect on the pre-expansion expansion of cast iron, and when it is more than 2 wt.%, It forms intermetallic inclusions, causing a decrease in the processability of cast iron.

When you enter the modifier of the proposed composition significantly changes the microstructure of cast iron. It creates optimal shape boundary 30 not only the fitting which is lubricated during machining, but also the metal substrate, which izmel- -chaetsya _ζ becomes uniform, and therefore decrease dinamiches35

Kie loads during processing and wear of the cutting tool, improves the quality of the machined surface, increases the cutting speed.

The proposed modifier and mod-fixer prototype are produced in an YCT-0.16 induction furnace, the casting temperature is 1420-1450 ° C. As / blend materials used ferrosilicon FS75 GOST 1415-78, silicocalcium SC1O GOST 4762-71, primary aluminum AO GOST 11069-74, ferrosilicone zirconium FSCr50 TU 14-5-83-77, ligature FSZORZMZO TU 14-15-36-136- 81, ferrotitanium FTIZO GOST 476180, ferromanganese FMN78 GOST 4755-50

-80, niobium ligature PAZ TU 48-4-491-87, cathode copper M00 GOST 546-79, graphite Grinded TU 48-20-54-84, metallic nickel H2 GOST 849-70, metallic tin $$ 01 TU 48- 13-11-76, ferrosilicon with barium FS55Ba32 TU 14-5-160-84, strontium ligature "Spirezeb.".

four

In order to study the effect of the modifier cast iron with content,

C 3.20-3.30; Ge 2.10-2.20; Mp 0.80,9; Cg 0.1; Νί 0.03; 5 0.04; P 0.05 smelted in an induction furnace ΠΟΤΟ, 16 at 1400-1420 ^ 0. Modifiers in the amount of 0.3% are injected onto a stream of liquid metal when overflowing from the furnace into the ladle. Granulometric composition of modifiers 2-10 mm.

Table 1 shows the chemical compositions of the known and proposed modifiers (2-4 - the proposed modifier and 5-6 - transcendental compositions).

Table 2 shows the results of tests of cast irons (1 - using a known ligature, 2-4 - using the proposed modifier, 5 and 6 - using a modifier with transcendental levels of manganese, carbon and niobium)

The fluidity of cast irons treated with modifiers 1-6 (Table 1) is determined by a spiral sample cast in accordance with GOST 1643870. Pre-shrinking expansion of the irons is measured on a V.P. Chernobrovkina unit (sample 30 mm and length 400 mm). The machinability of the cast iron is estimated by the Kesner method.

Tests are carried out on a vertical drilling machine at a spindle rotation frequency of n = 350 min ~ ’and on a spindle effort of 490 N, which is created by the load. Processing is carried out with a drill bit ¢ 10 mm from high-speed steel Р6М5. normal form of sharpening (2 c> = = 118 °). '

Estimated immersion depth of the drill for 60 s.

 The type and dimensions of the cast samples used to determine the mechanical conditions of cast iron are selected in accordance with GOST 1497-84 to estimate the tensile strength and GOST 2055-81 to estimate the flexural strength.

The machinability of cast iron modified with the prototype modifier (1) was taken as 100%. Bleached cast iron measured on the wedge sample, cast on a metal plate. The amount of ferrite in the structure was assessed using a Weor £ оС-21 microscope according to GOST 3443-77. The tensile strength of cast iron under tension and bending was determined

5 1500693 '

on standard samples on machines EI-40 and Ζϋ-10-90, respectively.

From table 1 and 2 it can be seen that the proposed modifier ensures the production of cast iron with greater fluidity, less pre-expansion and better workability while maintaining a high level of technological and mechanical properties.

Claims (1)

Claim A modifier for cast iron containing silicon, aluminum, calcium, zirconium, strontium, rare earth metals, titanium, iron, characterized in that, in order to increase the fluidity of cast iron, improve machinability while maintaining high levels of mechanical properties, it also contains manganese, carbon and niobium in the following ratio, wt.%: Silicon 60-70 Aluminum 0.1-2 Calcium 0.1-2 Zirconium 3-8 Strontium 0.1-2 Rare earth nye metals 0.1-2 Titanium 0.03-1 Manganese 3-8 Carbon 0.03-5 Niobium 0.05-2 Iron Rest Table 1 Composition Content of elements, wt.% modifier ------- g -------------------------------- · - 5ί A1 Sa Ζγ Vg Rare earth metal I Τΐ one (prototype) 63 1.5 2.0 4.0 2.0 2.0 0.01 2 60 0.1 0.1 oh oh 0.1 0.1 0.03 3 63 1.5 0.9 4.1 1.5 0.9 0.05 four · 75 2.0 2.0 8.0 2.0 2.0 1.00 five 63 1,3 0.8 4.0 1.5 0.8 0.05 6 62. 1.4 0.8 4.1 1.4 0.9 0.05 Continuation of table 1 Composition Content of elements, weight. I modifier Mp ^WITH N6 Re Si Νΐ 5p | Va one prototype The rest five five 1.5 2.5 a little 2 3 0.03 0.05 - - - - - 3 five 2.5 1.0 - - - - four eight five 2 - - - - five 2.0 0.01 0.03 - - - - 6 9.0 5.5 2.1 - - - - 7 1500693 eight table 2 Cast iron Cast iron properties Fluidity, mm Machinability 7 Bleached in a wedge, mm Strength at stretching MPa Flexural Strength MPa one (prototype) 260 100 6 240 500 2 3.14 106 3.5 260 550 3 362 118 3 300 620 four 391 130 2.5 320 660 five ' 291 126 eight 240 500 6 397 98 2.5 310 640