SU759618A1 - Composition for complex alloying of steel parts - Google Patents

Description

The invention relates to chemical heat treatment and can be used in the manufacture of working parts of dies and molds from tool carbon-5

disty or alloyed steels.

Known diffusion method of applying a metal coating in which the formation of an improved continuous surface layer containing chromium, manganese, berkeley, titanium, palladium allows to obtain high hardness and wear resistance [].

However, due to the extreme complexity of the process and expensive equipment, this method cannot be promising for implementation in tool manufacturing. 20

Also known composition for diffusion hardening of working parts Stamps and molds (U) It contains ferrovanadium, ferrotitanium, ammonium chloride and charcoal carburizer, and allows you to increase the wear resistance and mechanical properties of the tool.

Known mixture contains, forest.% <

Ferrovanadium 35-45 30

Ferrotitanium 10-20

Ammonium Chloride 0.5-1.5

Charcoal carburizer Else

The mixture is regenerated with a 10% additive from the initial composition of the unused mixture.

However, after 3 times the use of this mixture with a regenerated additive containing 10% of the initial mixture, its activity decreases as a result of thermodynamically possible reactions associated with the formation of oxides and carbides of titanium and vanadium in the saturating composition. At the same time, the saturating composition is depleted in carbon. This leads to a sharp decrease in the carbon, titanium and vanadium content in saturable instruments.

The aim of the invention is to increase the working life of the mixture.

This goal is achieved by the fact that the mixture contains as Vanadium-containing. component - vanadium chloride, as the titanium-containing component - chloride

759618

guitar in the following ratio of components, in wt.%:

Vanadium chloride 20-30

Titanium chloride 10-15

Charcoal

carburizer Else

Vanadium chloride and titanium chloride are introduced in order to more completely reduce vanadium and titanium from oxides and carbides formed in the most saturated mixture and replenish vanadium and titanium.

'To select the optimal composition of the regenerating additive, we investigated 12 compositions in which the content (wt.%,) Of vanadium chloride varies from 15, to 35 ·, "titanium chloride from 5 to 25, charcoal carburizer - the rest 10

15

, and the results of processing are presented in the table.

P r im p. Carry thermochemical treatment in the formulations of ukazTsnnyh parts U8 steels Kh12M, 4H5MFS at 1000 ^"45o ° C. The batch was produced in a furnace heated to 600 700 ° C and held for 2 hours. Then the temperature was raised to 1000 ° and produce an extract 12h "After this, cooling is carried out with the furnace up to 500150 ° C and then the final cooling is in air. At the end, the mechanical treatment (removal of the allowance of 0.1 mm per side) is hardened and tempered. The effect of the ratio of the components in the composition on the mechanical properties Table.

·, "

black / white

Composition

T1C ^

Carburetor

Yaksi

fry allowable multiplicity of Nepal's

carbolagira ·

frost

mixes

ieea

Sample material

Depth

layer,

mm

Physical and mechanical properties

Surface hardness, NIS

loelr

saturation

after

quenching

after

holidays

Mechanical properties after heat treatment

flexural strength, kg / mm *

impact strength, kgcm / cm ⁴

Increase. resistance to resistance after diffusion hardening, in times

one

1a_1l £ c_so-ίβ ·, · "'« η- ·> τη ϋ ϊ

6-7

I

20

3

; 25

to

ten Rest 65 X12M 4H5MFS 2.5 20-24 210-230 210-220 3.0-3.1 3.0-3.3 8-10 9 20-25 67-69 66-68 15 55 Uv 18-20 66-68 66-67 200-220 3.1-3.5 6-7 X12M 2.5 20-24 66-69 65-68 200-230 3.1-3.3 8-10 . · .-,,. '' '4H5MFS 20-25 67-69 66-68 210-230 3.0-3.2 9-10 νβ 18-20 66-68 66-67 200-220 3.0-3.2 6-7 ten 65 X12M 2.5 2.9-3.0 8-10 4H5MFS 30-25 67-69 66-68 210-230 3.0-31 8-10 Os— / tal- . · -. „-'.- Λ. ·: .... new ιέ 6? νβ 18-20 200-220 3.0-3.4 6-7 2.5 66-68 65-67 Χ12Μ 20-25 200-230 2.8-3.3 9 4Х51ЙС - β— 20-25 66-69 66-68 210-230 2.9-3.3 “, νβ 18-20 ten 65 ' 2.5 66-68 66-67 210-330 3.1-3.2 6-7 Χ12Μ • 20-25 66-68 200-220 2.8-3.2 8-10 4H5MFS 66-69 210-220 3.0-3.1 ·. ·· Os tal-  - 'my νβ ’M ·· 18-20 66-6866-67 3.1-3 / 3 6-7 310-220 15 65 Χ13Μ 2.5 20-25 <6-0 65-68. 3.0-3.1 8-0 4H5MFS "0-68 66-67 200-230 3.2-3.4 8-10

759618

As can be seen from the table, the optimal regenerating additive is a composition containing 10-15% titanium chloride and 20-30% vanadium chloride.

The regenerating mixture is added after 3-fold use of the saturating mixture in the amount of 35 wt.% From the initial weight of the initial mixture, having at least 5 mm from the parts (to avoid sticking)

The addition of a regenerating mixture maintains the carboluegating ability at the same level, allowing it to be used up to 65 times and, due to the activity of the mixture, prevents the decarburization of parts during saturation, which allows to obtain a diffusion layer of increased hardness (900-1100 Κν) and wear resistance (5-7 times) higher than in the known composition.

Claims (1)

Composition for complex alloying of steel parts, containing wood carbon carburizer, titanium and vanadium containing components, characterized in that, in order to increase the working life of the composition, vanadium chloride is used as the vanadium-containing 5 component, and titanium chloride as the titanium-containing component. : ten 15 20 Vanadium Chloride Titanium Chloride Charcoal Carburizer 20-30 10-15 Rest