SU1447881A1 - Hardening medium - Google Patents

Abstract

The invention relates to hardening joiM media based on polymers and can be used in the heat treatment of products from. structural steels. The purpose of the invention is to increase the heat resistance of the environment, to avoid staining and to prevent corrosion during quenching of products. The quenching medium contains, in wt%: a fluoroplast 4D suspension of 0.3-0.6; caustic soda 0.1-0.5; sodium carbonate O, 1-0.5; water - the rest. As a result of the use of this medium during hardening of structural steels, soft spots, cracks and corrosion were not found. The heat resistance of the environment is 60-70 C. The quenching medium is non-fire hazardous, harmless in operation and does not contain scarce materials. 2 tab.

Description

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The invention relates to quenching media based on polymers and can be used in the heat treatment of products made of structural steels.

The purpose of the invention is to increase the thermal resistance of the medium, to eliminate staining and to prevent corrosion during quenching of products.

The proposed quenching medium contains a suspension of fluoroplastic 4D, ed-unit sodium, sodium carbonate and water in the following ratio of components, wt.%:

Fluoroplastic suspension 4D0.3 - 0.6 Caustic soda 0.1-0.5 Sodium carbonate 0.1 - 0.5 - 0.4 microns in water, in which surfactants are introduced in an amount of 9-12% by weight of the dry polymer to stabilize and improve wetting.

Fluoroplastic 4D suspension has a positive effect on the cooling conditions of parts due to the formation of polymer complexes that are stable at high temperatures and decompose at high temperatures, as a result of which a high uniformity of cooling rate is achieved in all temperature ranges. zheniy, deformations; hardness is stabilized throughout the cross section of the workpiece (the difference in hardness was HRC 0.5-1.0 units); the tendency to crack formation is reduced; the heat resistance of the medium rises UO 60-70 ° C.

Fluoroplastic 4D suspension, being a corrosion inhibitor, at the same time contributes to the protection of the hardened product from corrosion.

The introduction of the quenching medium containing 0.3-0.6% of the suspension of fluoroplastic 4D and 0.1-0.5% of caustic soda to the composition, improves the processability of the medium in the process of operation, increases its fluidity and quenching ability.

Additive to the composition of the quenching medium sodium carbonate in an amount of 0.1

five ,. c

0

five

0.5 wt.% Has a positive effect on the cooling capacity of the medium, ensuring uniform cooling in the bubble boiling region and a decrease in the cooling rate in the temperature range of the martensitic transformation, which guarantees a reduction in deformation and elimination of cracking.

In order to verify the properties of the proposed for1; alopecia medium, they are manufactured and tested in laboratory production; conditions samples of steel 40X.

The heat resistance of the quenching composition is checked by determining the cooling rate of the medium in the interval

10-80 ° C and quantification of the hardness of quenched samples by section.

The corrosion resistance of the medium is checked on an external view of the surface of the charge: the products being poured after aging for 1-6 hours.

The tendency to crack formation is checked on sectors with a tooth cut with a modulus of 5 mm by the presence of cracks in the root of the tooth.

The test results are presented in Table. 1 (fluttering and corrosion not found).

As a result of the use of the proposed quenching medium, the uniformity of the speed oh-; In all temperature ranges at temperatures of the quenching medium up to 60-70 s, as a result, the hardness stabilizes not only over the section, but also over the surface of the hardened parts, eliminates the presence of soft spots (see ab. 2 ) |,

According to the test results of the quenching medium on the basis of a fluoroplastic 4D suspension, it has been established that: the heat resistance of the medium is 60-70 ° C;

HRO hardening ability 50 pcs. (no more than HES of 1 hardness), soft spots are absent;

no cracks detected;

no corrosion was detected.

The proposed quenching medium is not fire hazardous, since polytetrafluoroethane: ilene does not ignite even in its pure form, and only at temperatures of 415 ° C does its destruction occur (degradation).

The environment is harmless in operation, does not contain scarce materials.

31447881

Claims (1)

The invention claims that as a polymer, a suspension of fluorine-containing medium, predominantly of layer 4D, and as a mineral for structural steels, containing salt, is sodium carbonate with the following schia polymer, caustic sodium, mineral ratio of components, wt.%: Fluoroplastic salt suspension and water, different with TeMj. that, in order to increase the 4D nor the heat resistance of the medium, exclude Caustic soda stain and prevent corrosion Carbonate sdp when; hardening products, it contains in th. Water Table 1 0.3-0.6 0.1-0.5 0.1-0.5 Else 0.3-0.6 0.1-0.5 0.1-0.5 Else 860 ± 1О 15.0 Fluoride-10 slurry slurry 0.3 Caustic sodium 0,1 20 Sodium carbonate 0.1 Water - the rest 60 70 15.0 Fluoride-10 suspension 0.5 Caustic Sodium 0.3 20 Sodium carbonate 0.3 60ilO Water - the rest 60 70 Water - the rest 60 70 15.0 Fluoride-suspension-10 formation 4 D 0,6 Caustic Sodium 0.5 20 40 Sodium carbonate 0.5 Water - the rest is 70 860 ± 10 15.0 Oil 54 54 40 40 60 20 table 2