CN113278771A - Water-based quenching liquid, preparation method thereof and application thereof in elastic strip quenching - Google Patents
Water-based quenching liquid, preparation method thereof and application thereof in elastic strip quenching Download PDFInfo
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- CN113278771A CN113278771A CN202110568772.5A CN202110568772A CN113278771A CN 113278771 A CN113278771 A CN 113278771A CN 202110568772 A CN202110568772 A CN 202110568772A CN 113278771 A CN113278771 A CN 113278771A
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- 238000010791 quenching Methods 0.000 title claims abstract description 117
- 230000000171 quenching effect Effects 0.000 title claims abstract description 96
- 239000007788 liquid Substances 0.000 title claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title abstract description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 28
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims abstract description 28
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000001110 calcium chloride Substances 0.000 claims abstract description 18
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 18
- 239000011780 sodium chloride Substances 0.000 claims abstract description 14
- 235000010344 sodium nitrate Nutrition 0.000 claims abstract description 14
- 239000004317 sodium nitrate Substances 0.000 claims abstract description 14
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims abstract description 11
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims abstract description 11
- 235000010234 sodium benzoate Nutrition 0.000 claims abstract description 11
- 239000004299 sodium benzoate Substances 0.000 claims abstract description 11
- 239000000176 sodium gluconate Substances 0.000 claims abstract description 11
- 235000012207 sodium gluconate Nutrition 0.000 claims abstract description 11
- 229940005574 sodium gluconate Drugs 0.000 claims abstract description 11
- 239000011684 sodium molybdate Substances 0.000 claims abstract description 11
- 235000015393 sodium molybdate Nutrition 0.000 claims abstract description 11
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229920001577 copolymer Polymers 0.000 claims abstract description 10
- 229960005102 foscarnet Drugs 0.000 claims abstract description 10
- ZJAOAACCNHFJAH-UHFFFAOYSA-N hydroxycarbonylphosphonic acid Natural products OC(=O)P(O)(O)=O ZJAOAACCNHFJAH-UHFFFAOYSA-N 0.000 claims abstract description 10
- 150000003852 triazoles Chemical class 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 22
- 238000007865 diluting Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 229960003885 sodium benzoate Drugs 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 239000000243 solution Substances 0.000 description 8
- 238000003756 stirring Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical group [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 238000003889 chemical engineering Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012847 fine chemical Substances 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- -1 preferably Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to the technical field of railway engineering product manufacturing, in particular to a water-based quenching liquid, a preparation method thereof and application thereof in elastic bar quenching. The water-based quenching liquid contains 0.1-0.8 wt% of sodium benzoate, 0.01-0.5 wt% of sodium gluconate, 0.01-0.5 wt% of phosphono carboxylic acid copolymer, 0.01-0.5 wt% of triazole, 0.01-0.5 wt% of sodium molybdate, 0-25 wt% of sodium chloride, 0-25 wt% of calcium chloride, 0-25 wt% of sodium nitrate and the balance of water; wherein the contents of sodium chloride, calcium chloride and sodium nitrate are not 0 at the same time. The water-based quenching liquid can not only improve the quenching speed of the elastic strip and ensure the hardness uniformity of the quenching center, but also generate residual compressive stress on the surface of the quenched elastic strip and inhibit the generation and the expansion of quenching cracks.
Description
Technical Field
The invention relates to the technical field of railway engineering product manufacturing, in particular to a water-based quenching liquid, a preparation method thereof and application thereof in elastic bar quenching.
Background
The elastic strip is the core of the fastener system, can provide certain fastening pressure for the fastener system through elastic deformation, and can absorb energy generated when the steel rail impacts and vibrates so as to ensure the stability of the steel rail. In the manufacturing process of the elastic strip, the potential of the metal material is fully exerted through quenching and tempering treatment so as to meet the use requirement of the elastic strip.
The quenching medium for the spring strip mainly needs to meet two requirements: firstly, enough cooling capacity is provided to ensure that the structure of the elastic strip is completely transformed into martensite, so that the uniform hardness of the elastic strip is ensured; and secondly, the quenching residual stress caused in the quenching process is reduced, and the elastic strip is ensured not to generate quenching cracks.
The existing spring strip quenching medium mainly adopts rapid quenching oil. The quenching oil can meet the hardenability requirement of part of the elastic strips, but for the elastic strips with larger diameters, the core hardness of the elastic strips is difficult to ensure. Moreover, the rapid quenching oil can generate larger residual tensile stress, so that quenching cracks are formed on the surface of part of the elastic strip, and the service life of the elastic strip is shortened. Meanwhile, when the quenching oil is used, oil smoke, oily wastewater and iron slag with oil can be generated, and the cost of environment-friendly treatment is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a water-based quenching liquid, a preparation method thereof and application thereof in elastic strip quenching. The water-based quenching liquid can not only improve the quenching speed of the elastic strip and ensure the hardness uniformity of the quenching center, but also generate residual compressive stress on the surface of the quenched elastic strip and inhibit the generation and the expansion of quenching cracks.
In order to achieve the above object, a first aspect of the present invention is a water-based quenching liquid comprising
Wherein the contents of sodium chloride, calcium chloride and sodium nitrate are not 0 at the same time.
In a second aspect, the present invention provides a method for preparing the water-based quenching liquid, which comprises: and dissolving sodium benzoate, sodium gluconate, phosphono carboxylic acid copolymer, triazole and sodium molybdate and at least one of sodium chloride, calcium chloride and sodium nitrate in water, and optionally diluting to obtain the water-based quenching liquid.
A third aspect of the invention provides the use of a water-based quench liquid as described above for quenching of a spring.
In a fourth aspect, the present invention provides a method for quenching an elastic strip, the method comprising: contacting the elastic strip to be quenched with the water-based quenching liquid to quench the elastic strip to be quenched;
wherein, the diameter of the elastic strip is 12-20 mm.
The water-based quenching liquid can not only improve the quenching speed of the elastic strip, ensure the uniformity of the hardness of the core of the quenched elastic strip, but also generate residual compressive stress on the surface of the quenched elastic strip and inhibit the generation and the expansion of quenching cracks. Meanwhile, the invention also has the advantages of safe use, environmental protection, no corrosion to workpieces, long service life and the like. The invention can overcome the problems that the traditional spring strip quenching medium is difficult to ensure the core hardness of the spring strip and is easy to generate quenching cracks, and the like, improves the quality of the spring strip product and reduces the production cost.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the present invention provides a water-based quench bath comprising
Wherein the contents of sodium chloride, calcium chloride and sodium nitrate are not 0 at the same time.
According to the invention, the concentration of sodium benzoate in the water-based quench liquid may be 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, preferably 0.4-0.6 wt%.
According to the invention, the concentration of sodium gluconate in the water-based quench liquid may be 0.01 wt.%, 0.02 wt.%, 0.03 wt.%, 0.04 wt.%, 0.05 wt.%, 0.06 wt.%, 0.07 wt.%, 0.08 wt.%, 0.09 wt.%, 0.1 wt.%, 0.2 wt.%, 0.3 wt.%, 0.4 wt.%, 0.5 wt.%, preferably 0.05-0.1 wt.%.
According to the invention, the concentration of phosphonocarboxylic acid copolymer in the aqueous quench liquid may be 0.01 wt%, 0.02 wt%, 0.03 wt%, 0.04 wt%, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, preferably 0.05-0.1 wt%.
Wherein the weight average molecular weight of the phosphonocarboxylic acid copolymer is preferably 3000-4000.
According to the present invention, the concentration of triazole in the water-based quenching liquid may be 0.01 wt%, 0.02 wt%, 0.03 wt%, 0.04 wt%, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, preferably 0.05-0.1 wt%.
According to the invention, the concentration of sodium molybdate in the water-based quench liquid may be 0.01 wt.%, 0.02 wt.%, 0.03 wt.%, 0.04 wt.%, 0.05 wt.%, 0.06 wt.%, 0.07 wt.%, 0.08 wt.%, 0.09 wt.%, 0.1 wt.%, 0.12 wt.%, 0.14 wt.%, 0.16 wt.%, 0.18 wt.%, 0.2 wt.%, 0.3 wt.%, 0.4 wt.%, 0.5 wt.%, preferably 0.1-0.2 wt.%.
According to a preferred embodiment of the invention, the water-based quench liquid contains sodium chloride in a concentration which may be 0.01 wt.%, 0.05 wt.%, 0.1 wt.%, 0.5 wt.%, 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.%, 5 wt.%, 6 wt.%, 7 wt.%, 8 wt.%, 9 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.%, preferably 3-8 wt.%.
According to a preferred embodiment of the invention, the water-based quench liquid contains calcium chloride in a concentration that may be 0.01 wt.%, 0.05 wt.%, 0.1 wt.%, 0.5 wt.%, 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.%, 5 wt.%, 6 wt.%, 7 wt.%, 8 wt.%, 9 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.%, preferably 3-8 wt.%.
According to a preferred embodiment of the invention, the water-based quench liquid contains sodium nitrate in a concentration that may be 0.01 wt.%, 0.05 wt.%, 0.1 wt.%, 0.5 wt.%, 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.%, 5 wt.%, 6 wt.%, 7 wt.%, 8 wt.%, 9 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.%, preferably 3-8 wt.%.
According to the invention, the pH of the water-based quenching liquid can be selected in a wide range, and in order to further improve the quenching effect on the elastic strips, the pH of the water-based quenching liquid is preferably 7-9, preferably 7.5-8.5, and for example, may be 7.5, 7.6, 7.7, 7.8, 7.9, 8, 8.1, 8.2, 8.3, 8.4, 8.5.
The pH may be adjusted by using an alkali adjusting agent which is conventional in the art, and may be, for example, but not limited to, sodium hydroxide, sodium carbonate, sodium bicarbonate, and the like, and sodium hydroxide is more preferable.
Thus, it can be appreciated that in preferred cases, the aqueous based quench liquid also contains an alkali modifier, more preferably sodium hydroxide.
According to a preferred embodiment of the invention, the aqueous quench liquid contains
Wherein the pH of the water-based quenching liquid is adjusted to 7-9, preferably 7.5-8.5 by using sodium hydroxide.
According to the present invention, the water may be conventional water, and for example, may be deionized water, purified water, distilled water, or the like.
In a second aspect, the present invention provides a method for preparing the water-based quenching liquid of the first aspect, which comprises: and dissolving sodium benzoate, sodium gluconate, phosphono carboxylic acid copolymer, triazole and sodium molybdate and at least one of sodium chloride, calcium chloride and sodium nitrate in water, and optionally diluting to obtain the water-based quenching liquid.
Wherein, the optional dilution means that when the amount of water used is relatively small, each component is dissolved in water to obtain a concentrated solution of the water-based quenching liquid, when the concentrated solution is used, the water-based quenching liquid can be obtained by appropriate dilution, and when the amount of water is just enough to enable each component to be in the concentration range of the first aspect of the invention, the components can be directly used without dilution.
According to the present invention, the aqueous quenching liquid of the present invention can be obtained by merely dissolving the above components of the present invention in water and optionally diluting, but the inventors of the present invention have found in their studies that the performance can be further improved by carrying out the preparation of the aqueous quenching liquid according to the following specific steps.
Therefore, according to a preferred embodiment of the present invention, the method for preparing the water-based quenching liquid comprises:
(1) dissolving at least one of sodium chloride, calcium chloride and sodium nitrate in water to obtain a first solution;
(2) adding sodium benzoate, sodium gluconate and sodium molybdate into the first liquid to obtain a second liquid;
(3) adding phosphono carboxylic acid copolymer and triazole into the second liquid under the condition of heating to obtain a third liquid;
(4) and cooling and optionally diluting the third liquid to obtain the water-based quenching liquid.
According to the present invention, in step (1), in order to obtain a more uniform first liquid, it is preferable that at least one of sodium chloride, calcium chloride and sodium nitrate is dissolved in water and then stirred for 40 to 80 min.
According to the present invention, in step (2), in order to obtain a more uniform second solution, preferably, sodium benzoate, sodium gluconate, and sodium molybdate are added to the first solution, followed by stirring for 40-80 min.
According to the present invention, in the step (3), the temperature of heating is preferably 50 to 70 ℃, more preferably 55 to 65 ℃.
Among them, in order to obtain a more uniform third solution, it is preferable that each component is added and stirred for 40 to 80 min.
According to the invention, the cooling is preferably such that the third liquid is cooled to room temperature.
Wherein, in the absence of a contrary explanation, room temperature as used herein means a temperature of 20 to 40 ℃.
According to the present invention, preferably, the method further comprises, in order to further improve the properties of the prepared water-based quench liquid: and adjusting the pH value of the cooled third liquid, and carrying out solid-liquid separation to obtain the water-based quenching liquid.
The pH of the third liquid may be selected from a wide range, and in order to further improve the quenching effect on the elastic strip, the pH of the third liquid is preferably 7.5 to 8.5, and may be, for example, 7.5, 7.6, 7.7, 7.8, 7.9, 8, 8.1, 8.2, 8.3, 8.4, or 8.5.
The pH may be adjusted by using an alkali adjusting agent which is conventional in the art, and may be, for example, but not limited to, sodium hydroxide, sodium carbonate, sodium bicarbonate, and the like, and sodium hydroxide is more preferable.
According to the invention, preferably, after the pH value is adjusted, the method of the invention further comprises the step of stirring the system for 20-40min and then carrying out solid-liquid separation.
According to the present invention, the method of the solid-liquid separation is not particularly limited, and may be various conventional methods, for example, filtration, centrifugation and the like.
In a third aspect, the invention provides the use of a water-based quench liquid as described above for quenching of a spring.
In a fourth aspect, the present invention provides a method of quenching a spring, the method comprising: contacting the elastic strip to be quenched with the water-based quenching liquid to quench the elastic strip to be quenched;
wherein, the diameter of the elastic strip is 12-20 mm.
According to the invention, the method for quenching the elastic strip is suitable for the quenching link in the manufacturing heat treatment process of various types of elastic strip products taking various types of spring steel or alloy steel as raw materials (such as 60Si2Mn, 60Si2Cr, 65Mn and the like), so that the elastic strip at high temperature is rapidly cooled to room temperature to generate martensite phase transformation, and the aim of quenching the elastic strip is achieved.
The method of the invention is not only suitable for the elastic strip with smaller diameter, but also suitable for the elastic strip with larger diameter, and can ensure the core hardness of the elastic strip with larger diameter. Preferably, the diameter of the elastic strip is 12-20 mm.
The present invention will be described in detail below by way of examples.
Examples 1 to 3
The water-based quenching liquid provided by the invention and the preparation method thereof
1. Dissolving calcium chloride in deionized water, and stirring for 60 minutes to obtain an initial solution;
2. adding sodium benzoate, sodium gluconate and sodium molybdate into the mixed solution in the step (1), and stirring for 60 minutes;
3. heating the mixed solution in the step 2 to 60 ℃, adding phosphono carboxylic acid copolymer (POCA, weight average molecular weight 4000) and triazole, and stirring for 60 minutes;
4. and (3) cooling the mixed solution in the step (3) to 25 ℃, adjusting the pH value by adding sodium hydroxide, stirring for 30 minutes, and filtering precipitates to obtain the water-based quenching liquid, wherein the concentrations of the components are shown in the table 1.
TABLE 1
| Example 1 | Example 2 | Example 3 | |
| Calcium chloride (% by weight) | 5 | 8 | 3 |
| Sodium benzoate (wt%) | 0.5 | 0.05 | 0.1 |
| Sodium gluconate (weight%) | 0.1 | 0.1 | 0.05 |
| Sodium molybdate (wt%) | 0.2 | 0.15 | 0.1 |
| POCA (wt%) | 0.1 | 0.05 | 0.1 |
| Triazole (wt%) | 0.1 | 0.05 | 0.1 |
| pH (% by weight) | 8.0 | 7.5 | 8.5 |
Example 4
The preparation of a water-based quench liquid was carried out as in example 1, except that calcium chloride was not added, but replaced with an equal amount of sodium chloride.
Example 5
The preparation of a water-based quench liquid was carried out as in example 1, except that calcium chloride was not added, but replaced with an equal amount of sodium nitrate.
Comparative example 1
The preparation of a water-based quench bath was carried out as in example 1, except that calcium chloride was not added, but an equal amount of calcium nitrate was replaced.
Comparative example 2
The preparation of a water-based quench liquid was carried out as in example 1, except that sodium benzoate and sodium gluconate were not added and their amounts were supplemented with sodium molybdate, phosphonocarboxylic acid copolymer (POCA) and triazole on average.
Test example
The quenchers obtained in the above examples and comparative examples were used for the production of elastic bars for high speed railway having a diameter of 14mm, a model of W1 and a material of 60Si2Mn by on-line quenching, and whether cracks were generated after quenching, the quenching hardness at 1/2 from the surface, and the surface quenching hoop stress thereof were recorded as shown in table 2.
The quenchers obtained in the above examples and comparative examples were used for the production of high speed railway spring bars having a diameter of 20mm, a type III, and a 60Si2Mn material by in-line quenching, and the quenching hardness (closer to the surface 1/2, indicating better uniformity) and the surface quenching hoop stress were recorded as shown in table 3, in which the occurrence of cracks after quenching was recorded.
The elastic strip hardness test is carried out according to GB/T230.1. The sampling part of the test piece is the middle section of the middle limb of the elastic strip (the length of the middle limb is cut off to be about 13 mm-21 mm); and (3) testing four points in the range from the center of the cross section of the test piece and the radius from the center of the circle to 1/2 by using a Rockwell hardness tester, wherein the reading precision is 0.1HRC, taking the average value of the three points, and keeping an integer.
And measuring the quenching residual stress of the elastic strip by an X-ray stress meter, polishing the corresponding test point of the elastic strip, and performing surface quenching on the circumferential stress.
TABLE 2
The quenching oil is a quick bright quenching oil purchased from Beijing Huali fine chemical engineering (brand)
TABLE 3
The quenching oil is a quick bright quenching oil purchased from Beijing Huali fine chemical engineering (brand)
The elastic strip with the radius of 12-20mm produced by the water-based quenching liquid completely meets the relevant national and industrial standards through various indexes. The surface quenching stress is expressed as compressive stress (the stress value is negative), and compared with the tensile stress (the stress value is positive) on the surface of the elastic strip after quenching by quenching oil (rapid bright quenching oil), the quenching liquid has excellent crack inhibition performance.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The water-based quenching liquid is characterized by comprising
Wherein the contents of sodium chloride, calcium chloride and sodium nitrate are not 0 at the same time.
2. The water-based quench liquid of claim 1, wherein the water-based quench liquid contains
3. The water-based quench liquid of claim 1 or 2, wherein the content of sodium chloride is 3-8 wt%; and/or
The content of calcium chloride is 3-8 wt%; and/or
The content of sodium nitrate is 3 to 8% by weight.
4. The water-based quench liquid of any one of claims 1 to 3, wherein the pH of the water-based quench liquid is 7 to 9.
5. The water-based quenching liquid as claimed in any one of claims 1 to 4, wherein the water-based quenching liquid contains
Wherein the pH value of the water-based quenching liquid is 7-9.
6. A method for preparing the water-based quenching liquid as claimed in any one of claims 1 to 5, characterized in that the method comprises: and dissolving sodium benzoate, sodium gluconate, phosphono carboxylic acid copolymer, triazole and sodium molybdate and at least one of sodium chloride, calcium chloride and sodium nitrate in water, and optionally diluting to obtain the water-based quenching liquid.
7. The method of claim 6, wherein the method comprises:
(1) dissolving at least one of sodium chloride, calcium chloride and sodium nitrate in water to obtain a first solution;
(2) adding sodium benzoate, sodium gluconate and sodium molybdate into the first liquid to obtain a second liquid;
(3) adding phosphono carboxylic acid copolymer and triazole into the second liquid under the condition of heating to obtain a third liquid;
(4) and cooling the third liquid, and optionally diluting to obtain the water-based quenching liquid.
8. The method of claim 7, wherein the method further comprises: and adjusting the pH value of the cooled third liquid, and carrying out solid-liquid separation to obtain the water-based quenching liquid.
9. Use of the water-based quenching liquid according to any one of claims 1 to 5 for quenching of spring rods.
10. A method of quenching a spring, the method comprising: contacting the elastic strip to be quenched with the water-based quenching liquid as claimed in any one of claims 1 to 5 to quench the elastic strip to be quenched;
wherein, the diameter of the elastic strip is 12-20 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114369702A (en) * | 2021-12-21 | 2022-04-19 | 中钢集团邢台机械轧辊有限公司 | Quenching method of Cr12 roller |
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| US20150000710A1 (en) * | 2012-03-02 | 2015-01-01 | Idemitsu Kosan Co., Ltd. | Water-based coolant |
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| CN108179254A (en) * | 2018-02-01 | 2018-06-19 | 淮安齐瑞医疗用品有限公司 | A kind of cutter quenching medium |
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| US20150000710A1 (en) * | 2012-03-02 | 2015-01-01 | Idemitsu Kosan Co., Ltd. | Water-based coolant |
| CN102643963A (en) * | 2012-05-09 | 2012-08-22 | 上海福岛化工科技发展有限公司 | Environmental protection water-solubility quenching liquid |
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