SU1025748A1 - Modifier for cast iron - Google Patents

Description

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four

00 The invention relates to metal l can be used in the production of cast iron with high mechanical properties. Known modifier l to improve the quality of cast iron, containing, weightD: Iron10 - 15 Silicon 50.5-85 Strontium0.1 - 10 Yttrium0.1-10 Aluminum0.1-3 Calcium, 0.1-1.5 Modifier is intended for Radiation of thin-walled cast iron from cast iron without chill. The disadvantage of this composition is the low mechanical properties of the modified cast iron. Known modifier 2, containing, wt.%: 55 - 80 Silicon Rare-earth metals Strontium Calcium Aluminum Else Iron Known composition allows to cast castings without chill with such khanicheskimi properties: Tensile strength at break, kg / mm Elongation,% 3- 5 Hardness HB, 190-230. The closest available to the technical essence and the achieved result is a modifier 33 for cast iron, containing, wt.%: Silicon - 65 Rare-earth metals Strontium 0.1 - 5 Calcium 0.1-5 0 , 1 - 15 0.1 - 1 Aluminum 0.1 - 5 Else Iron The disadvantages of this modifiers are the low mechanical properties of the treated iron and the inaccurate hydrodensity of the molds. The purpose of the invention is to increase the efficacy of the modifiers свойств physical and physical properties of cast iron and cast iron. The goal is achieved by a modifier for cast iron, silicon, rare earth metals, oncium, calcium, copper, titanium, aluminum alu minium, and additionally, nickel, zirconium, and tin with the following ratio of components, D: SiliconitO - b5 Rare earth metals0.1 5 Strontium 0.1-5 Calcium0.1-5 Copper0.1-10 Titan0.1-10 Aluminum0.1 - 3 Barium0.1 - 5 Nickel0.1-10 Zirconium0.1-10 Tin0.1-3 IronEstalled Melted and tested compositions of qualifiers, which are given abl.1. Table 1

0.1 50.1

5 2.5

2.5 2.52.5

5 0.15

0.1

2.5 2.52.5

10 10 0.1 3 Ostal

,one

Nue 5 5 5 - 1,5 Same

five

0.1 0.1 10 0.1

5.0

5, 0 The effectiveness test of the modifier is carried out on the basic composition of cast iron, containing, weightD: carbon 3.8; silicon 2.2; manganese 0, chromium 0.02; phosphorus 0.03; sulfur 0.03. The original cast iron is smelted in a 30 kg induction furnace. The temperature of the cast iron during modification is H00-1 20 ° C. The modification is carried out by immersing the modifier on the bottom of the metal before the iron is released from the furnace. The amount of modifier introduced is 1.5% by weight of the molten iron. To study the structure, mechanical properties and density of the reflux.

.73,8

5.2 73.6

7.0

5.5 73.5

76.0

6.0 6.5 75.8

Famous k

72.5 72.2

OpoBepi a of the proposed composition of the modifier showed egb efficiency in obtaining cast iron from high 750 7.15

Fine perlite, ferrite up to 3%, there is no cementite

255 7.15

Same 5.5

V, 0

269 7.25

-Ch .., 2

244 6.95

Perlite, ferrite up to 10, no cementite

kimi physico-mechanical properties and density. Thus, the tensile strength of cast iron is increased by 1.5 refractory samples and a stepped test with a wall thickness of 3510, 15 mm. Mechanical properties are determined on standard specimens cut from trefoid samples. The density of the cast iron is determined by hydrostatic weighing of the samples. . The microstructure of the modified cast irons in the cross-section of the step sample 3.5; ten; 15 mm - fine perlite, with a ferrite content of up to 3, without inclusions of structurally free carbides and spherical graphite with a spheroidization degree of 85%. Mechanical properties, microg structure and density of cast iron are given in table 2. table 2

 kg / mm; „relative elongation of 0.5–7 and density of 2.5–3 compared with cast iron modified with a known modifier.

Castings of body parts of slurry pumps, molded from mughun, modified-1 modified by the proposed composition, modifier, do not have TET leaks during hydrotesting of Gdavleniye, 4tm) and are called high operational

durability (1.6 times higher than,. ordinary gray iron castings). Technical and economic effect from. use of the proposed composition of the modifier is rub. for 1 ton of castings for estimates of the modifier efficiency increase, which allows to improve the physical and mechanical properties of cast iron, respectively, to increase the durability and reliability of the machine parts.

Claims (1)

MODIFIER FOR CAST IRON, containing silicon, rare-earth metals, strontium, calcium, copper, titanium, aluminum and iron *: This is because, in order to increase the mechanical properties of cast iron and its density, it additionally contains barium, nickel, zirconium and tin in the following ratio components, wt.%: · Silicon Rare Earth 40 ·· * 65 metals 0.1 5 : Strontium 0.1 5 Calcium 0.1 5 Copper 0.1 10 Titanium 0.1 G. - Aluminum 0.1 3 Barium Nickel 0,1 '0,1 5 10 AT Zirconium 0.1 10 (L Tin 0.1 3 Iron Rest