021 potassium permanganate solution
[Introduction] Potassium permanganate is decomposed and vaporized by heat. Therefore, manganese and other impurities are contained in the vapor film, and the amount of impurities is allowed to be <0.035 mg/L. Potassium permanganate is a strong oxidant and needs to be stored in ceramic or tile tanks. The surface of the workpiece is black after quenching. The price of potassium permanganate is relatively high, which limits its application. The medium generally operates at 20 to 40 °C.
Quenching agent composition: The solubility of potassium permanganate in water increases with increasing temperature. For example, the solubility is 5% at 18 ° C and 7.6% at 25 ° C. Potassium permanganate having a temperature higher than 200 ° C decomposes.
[Quenching and cooling characteristics] The cooling rate of potassium permanganate aqueous solution is generally small. The cooling rate is 450 ° C / s at 600 ~ 500 ° C, 140 ° C / s at 300 ° C, and 60 ° C / s at 200 ° C.
ã€The main purpose】
13% to 5% potassium permanganate aqueous solution can be used for T7 (A), 45, 40CrNi steel.
A 23% to 5% potassium permanganate aqueous solution can also be used for induction hardening.
022 aqueous sodium hydroxide solution
[Introduction] After adding 5% (mass fraction) of caustic soda to the water, the vapor film can be quickly ruptured and transitioned to the boiling stage, causing a rapid increase in cooling rate. At temperatures below 250 ° C, the cooling rate in the aqueous alkali solution is much slower than in water; when the concentration (mass fraction) is increased to 30%, the viscosity of the medium is greatly increased, and the cooling rate is lowered over the entire temperature range.
NaOH can interact with the scale on the surface of the quenching part to precipitate hydrogen gas, so that the degree of oxidation is rapidly peeled off, so that the surface of the quenching part is bright silver white.
The medium is corrosive and has poor working conditions, and it is easy to absorb carbon dioxide in the air during use to gradually change the composition.
[Quenching and cooling characteristics] The cooling curve is basically the same as that of sodium chloride solution. The cooling rate also changes significantly with the solution temperature, but the cooling capacity is greater than that of sodium chloride.
The 50% caustic soda aqueous solution increases with the temperature of the medium, and the cooling rate decreases in the high temperature zone, while the cooling rate in the low temperature zone of 300-150 °C rarely changes, but the high concentration caustic soda aqueous solution tends to appear on the workpiece at a temperature of >60 °C. Quenching soft spots, so the medium should be used in the cold state, and the production is often controlled at 20 ~ 40 °C.
The higher cost of caustic soda makes it generally not necessary to use a 5% to 10% caustic soda aqueous solution quenching agent in production. However, the caustic soda water solution of 35% to 40% or higher, as a quenching agent for carbon tool steel workpieces, can avoid problems such as uneven quenching, cracking and warpage. The cooling effect of the medium is close to the two-liquid quenching of water and oil, and the concentration (mass fraction) of the caustic soda aqueous solution can be controlled at 35% to 40%.
ã€The main purpose】
1 For quenching and cooling of carbon steel, high concentration of caustic soda aqueous solution, especially as a quenching agent for carbon tool steel workpiece, can avoid quenching unevenness.
2 pairs of ball bearing steel, low alloy steel complex parts, the quenching hardness cooling effect is also satisfactory.
[Precautions for use]
1 Caustic sodium solution is highly corrosive to skin and fabrics. When using it, it should strictly abide by labor insurance measures and make full use of ventilation.
2 This solution is very easy to absorb carbon dioxide in the air, change the quenching cooling characteristics, shorten the service life, and need regular testing.
3 Periodically remove the sediment deposited on the bottom of the quenching tank, or replace the solution.
023 sulfite aqueous solution
[Introduction] The medium is non-toxic, non-flammable, has no toxic damage to human skin, and can eliminate the cleaning process after quenching. However, in the process of use, in order to suppress the fermentation of the medium, compressed air should always be blown into the tank, and the strength of the compressed air should be based on the workpiece that the air bubble cannot be cooled. This increases the use of the medium to the auxiliary equipment and is more cumbersome.
[Quenching and cooling characteristics] The cooling rate is between water and oil cooling, and the concentration change will have a direct impact on the cooling capacity. The quenching ability of the monosulfite is maintained to the boiling temperature.
[Main use] It can be recommended as the medium for immersion quenching and cooling.
024 plus alkali multiple inorganic brine medium
[Introduction] The medium has a good hardening effect, especially for the steel to have a smooth surface and to prevent corrosion for a long time.
Formulation (mass fraction): NaCl: 0.6816 kg, Na2SO4: 0.0568 kg, V: 0.028 kg, Na2CO3: 0.0568 kg, NaOH: 0.5396 kg. The above chemicals are all dry. Add 3.7853L distilled water.
[Main use] Recommended for immersion quenching and cooling media.
025 iodinated aqueous salt solution
[Introduction] Iodine nitrate salt aqueous solution is also called universal quenching agent, and the steel material can obtain high hardness and low deformation effect after quenching in the medium. The medium used has a temperature less than 70 °C.
Quenching agent formula (mass fraction): 25% KNO3, 20% NaNO3, 22% NaNO2, 20% NaCl, 1% KI, 30% H2O.
[Main use] 45 steel can be as high as 55~60HRC after quenching.
026 sulfuric acid aqueous solution
[Introduction] The acid quenching medium includes a solution of an acid such as sulfuric acid, hydrochloric acid or acetic acid. Among them, the hydrochloric acid content is generally 10% to 20%.
[Quenching and cooling characteristics] 10% to 20% of the sulfuric acid solution is faster than the water, indicating that the stability of the sulfuric acid aqueous vapor film is particularly effective than the vaporization heat. The change in the temperature of the medium hardly affects the cooling rate. At the same time, the medium has no film boiling stage. At high temperatures, the cooling rate is faster than water, and the boiling in the high temperature range stops. The cooling rate is slower below 400 °C. For example, at 18 °C, the average cooling rate of the 10% sulfuric acid aqueous solution in the interval of 650-550 °C is 750 °C / s, and the average cooling rate in the interval of 300-200 °C is 300 °C / s. The above is the result of testing with a φ6.4 mm × 50 mm cylindrical specimen made of nickel-silicon.
[Main use] Since acid stimulates human skin and corrodes workpieces, its application in production is limited.
027 glycerin aqueous solution
[Introduction] Adding 10% to 25% glycerol in water can slightly increase the boiling point, and the cooling rate at low temperature is slightly reduced, while the thermal conductivity in the membranous boiling period is significantly reduced; when the glycerin content is increased to 50%~ At 70%, the cooling rate above 500 °C and below 300 °C can be drastically reduced; thus the temperature range of the maximum cooling rate in the high temperature zone is moved; when the glycerin content reaches 90%, the cooling rate is very slow at 800-400 °C. Cool down slightly at low temperatures.
At temperatures >50 ° C, the cooling rate appears twice maximum. One is caused by boiling of water, and the other is caused by boiling of glycerol. Moreover, glycerin is water-absorbent and the composition gradually changes during use.
[Main use] The glycerin aqueous solution is preferably used at a temperature of 15 to 30 ° C, and is currently used less in production.
028 polyvinyl alcohol (PVA) aqueous solution
[Introduction] Polyvinyl alcohol (PVA) aqueous solution is also commonly known as plastic quenching liquid. The water solubility of polyvinyl alcohol is related to the degree of alcoholysis. The water solubility is best when the degree of alcoholysis is about 88%, and the polyvinyl alcohol can be dissolved in warm water. Above or below this degree of alcoholysis, the solubility properties are poor. The higher the concentration of the aqueous solution of polyvinyl alcohol, the lower the hardenability of the workpiece and the worse the hardenability. At the same concentration, the higher the degree of polymerization, the smaller the cooling rate. Polyvinyl alcohol encounters a small amount of inorganic salts, such as sodium nitrite, which does not decompose, increases a small amount of sodium nitrite and increases the content of sodium benzoate, which can slow down the cooling rate and increase the anti-rust and anti-corrosion effects.
[Quenching and cooling characteristics] In the spray state, a small amount of polyvinyl alcohol is added to the water, the performance of the medium is greatly changed, the temperature range of the maximum cooling rate is obviously improved, and in the range of 300 to 200 ° C, it is slow. Cooling rate.
Regarding the tendency of the organic quenching agent to cause cracking in the low temperature region, it is not specified in Appendix A of JB/T6955. The average cooling rate of the medium from 300 ° C to 200 ° C is below 250 ° C / s, and generally no cracking of the part occurs, and the CP value thereof See Table 2-5.
[Main use] The aqueous solution of 0.05% to 0.5% polyvinyl alcohol is mainly used for induction heating spray cooling. The materials to be treated include carbon structural steel, tool steel, low alloy structural steel and bearing steel.
029 polyvinyl alcohol synthetic quenching agent
[Introduction] It is a light yellow translucent concentrate. It should be diluted with a certain proportion of water according to the quenching process requirements of the workpiece before use. The medium is non-toxic, non-toxic, non-corrosive, non-flammable, safe to use, and free from environmental pollution. It has good quenching properties, low cost and wide application range.
After quenching, the workpiece does not adhere to debris, the surface is clean and hygienic, and has a certain anti-rust ability. Replacing oil quenching with this medium can significantly reduce production costs.
[Quenching and cooling characteristics] By adjusting the concentration of the aqueous solution, the cooling capacity can be adjusted over a wide range, and it can be obtained close to water, or between water and oil, and equivalent to oil or slower cooling rate to meet Quenching requirements for different materials and workpieces.
When quenching with the medium, the cooling rate is slower in the initial quenching stage, and the cooling rate is increased in the boiling stage, which is beneficial to obtain the martensite structure. When entering the convection stage, the cooling capacity is much slower than that of the water, so that the workpiece can be quenched. Deformation and cracking tendency.
[Typical physical and chemical properties] JB 4393-87
Appearance: colorless to pale yellow, evenly dissolved liquid (translucent)
Solid content: 10%
pH: 6-8
Viscosity: 20 ~ 50s (based on the coating-1 viscosity meter)
Conductivity: 0.2 ~ 0.3s / m
ã€The main purpose】
1 is used for high frequency and medium frequency quenching cooling of carbon steel and alloy steel.
2 can also be used for the overall heating and quenching of the workpiece. For example: 40Cr, 40CrMo, 40Mn2, 45Mn2, 30CrMnSi steel.
The quenching and tempering treatment of 3GCr15, 9CrSi steel and other rolls and the quenching of 42CrMo, Cr12, Cr12Mo and other molds usually increase the concentration (mass fraction) to 0.3%~0.5%, which is used to replace quenching oil and obtain better economic benefits.
4 is also applicable to: 45Cr, 20CrMo, 35CrMo, 40CrMnMo, 42CrNi, 9Cr3, 3Cr2W8 and other steel parts quenching and cooling.
[Use caution]
(1) Concentration control During the quenching process, the concentration of the quenching medium is gradually reduced as the quenched workpiece continuously carries away the polyvinyl alcohol. In order to stabilize the concentration of the quenching medium within the required range, the concentration of the quenching liquid is generally measured periodically (daily or weekly) by a refractometer, and the medium concentration of the quenching agent is supplemented in time to control the medium concentration.
The simple test method after dilution of the polyvinyl alcohol synthetic quenching agent is as follows.
1 Before using the refractometer to measure the concentration, use tap water as the test solution and adjust the refractometer reading to 0 position.
2 After the quenching agent was diluted in proportion, the borreose degree (BX) was measured by a type 15 refractometer to compare Table 2-6.
(2) Temperature control As the temperature of the quenching agent increases, the cooling rate becomes slower. When the liquid temperature is >50 °C, the cooling rate changes greatly. Therefore, the liquid temperature is generally controlled at 20 to 45 °C.
(3) Applicable to quenching object The quenching agent is not suitable for the quenching of parts heated by a salt furnace. The inorganic salt brought in by the work may cause decomposition of polyvinyl alcohol, resulting in a change in cooling performance.
(4) Medium maintenance The biggest weakness of the quenching agent is that it is prone to mildew during the high temperature in the summer and produces an unpleasant odor. In order to extend the service life of the medium, reasonable agitation can ensure the stability of the medium. Usually used for pumping or propeller mixing. When stirring with a pump, the flow rate of the medium is preferably <1 m/s, and air should be prevented from being caught in the liquid; when stirring with a propeller, the rotation speed is preferably 100-450 r/min. Frequent agitation prevents the formation of mold and can cause a small amount of mold that has formed to die and die.
Another way to prevent mold mildew is to add an appropriate amount of a preservative such as sodium benzoate to the medium. During the period of use, if there is no quenching task for a long time, in order to keep the quenching medium from mildew, the pump cycle should be started every 1~2 days for 1~2h. The service life of the quenching agent depends on the degree of cleanliness. Practice has shown that the use period is from 0.5 to 3 years. The key is maintenance.
(5) Storage and transportation conditions The raw liquid of this product is afraid of freezing and should be stored and transported under the condition of temperature >5 °C. If it is frozen and crystallized, it will be invalidated. Users should prepare for winter use before freezing in winter. Storage conditions should be in a cool place.
(6) Waste liquid discharge The national sewage discharge standard is (100mg/L). The bio-oxygen consumption of the polyvinyl alcohol synthetic quenching agent is 68.4 mg/L, which is lower than the national sewage discharge standard. Therefore, it can be discharged freely. If the medium concentration is high for some reason, it can be diluted with water to make its biological consumption lower than the national standard.
030 polymer synthesis quenching agent
[Introduction] Comply with the standard for polymer synthesis quenching agent JB/T 4393-1999. The medium is generally used at a concentration of 0.1% to 0.3%, and the use temperature is 20 to 50 °C.
[Quenching Ridge Characteristics] The cooling rate is 50 to 100 ° C / s at the high temperature stage in which the vapor film is formed, and is between water (100 to 200 ° C / s) and oil (30 to 50 ° C / s). The rupture temperature of the vapor film also slightly increases as the concentration of the medium increases.
At a concentration of 0.1%, it is about 500 ° C, close to water. The maximum cooling rate in the boiling stage decreased significantly with the increase of the medium concentration, and the maximum cooling rate was 450-500 ° C / s at 0.1% concentration. It is about 350 to 400 ° C / s at 0.2% concentration and about 280 to 320 ° C / s at 0.3% concentration.
At various concentrations, the maximum cooling rate is much less than the cooling rate of water (700 ° C / s), and greater than the oil (1 50 ° C / s). In the low temperature zone (200 ° C) stage, the three concentrations of cooling rate is slow, about 100 ° C / s, much lower than water (350 ° C / s), greater than oil (0 ~ 10 ° C / s).
ã€The main purpose】
1 polyvinyl alcohol quenching liquid, suitable for surface quenching such as induction hardening, flame surface quenching, etc. in production.
2 protective atmosphere furnace heating quenching and cooling.
3 The medium should not be used as a salt bath furnace to heat the workpiece cooling medium.
081 WGY quenching agent
[Introduction] WGY type quenching agent is a compound type quenching agent whose main components are inorganic salts and polymers. The appearance of the aqueous solution is dark brown, because the concentration of the water mash is low, and the amount of workpieces taken out during quenching is small. The quenching liquid is non-toxic, has no odor, does not burn, does not generate smoke, has no pollution to the environment, is non-corrosive to the quenching equipment and the workpiece, and the surface of the workpiece is dark blue after quenching, and no rust occurs in the air for one month. No special cleaning process is required before tempering.
[Quenching and cooling characteristics] The quenching agent cooling rate can be adjusted to any cooling rate between the water and oil cooling rate, or lower than the oil cooling rate. The cooling rate at 300 ° C is slightly higher than the oil, which is used instead of the oil quenching. feasible. When the concentration of WGY quenching agent is 60-80g/L, the distribution curve of hardened layer of 40Cr steel is similar to that of oil-hardened hardened layer; when its concentration (mass fraction) is 60g/L, the distribution curve of hardened layer of 60Si2Mn steel and Oil quenching is similar. It can be seen that as long as the appropriate concentration is selected, the hardenability and hardenability can be similar to the oil quenching.
When the quenching agent with concentration (mass fraction) of 80-120g/L is used, the opening deformation of sensitive samples of 40Cr and 60Si2Mn steel is similar to that of oil quenching, no cracking, and WGY quenching agent can replace oil quenching.
ã€The main purpose】
The quenching of 160Si2Mn steel leaf spring indicates that the quenching effect of WGY quenching agent is similar to that of 282A and AQ251, and the price of WMY quenching agent is low, the use concentration is low, and it is more economical.
The heat treatment technical conditions of 240Cr steel automobile cylinder head Bolts and 35CrMo steel differential Screw guigui are quenched and tempered, and the quenching hardness is more than 55HRC. The hardness of the cylinder head bolt tempering is 30 ~ 35HRC, and the surface and the core hardness are the same. The tempering hardness of the differential screw is 38 to 44 HRC. The WGY quenching liquid concentration (mass fraction) is 80g/L, which is heated and quenched according to the factory site process specifications. After quenching the cylinder head bolt, the section hardness is 57HRC, and the section hardness after tempering is 33HRC, which meets the technical requirements.
It is feasible to replace mechanical oil quenching with WGY quenching agent for medium carbon alloy steel parts.
4 The medium replaces the mechanical oil to quench the medium carbon alloy steel leaf spring and the automobile bolt. Its metallographic structure, quenching hardness, mechanical properties and oil quenching are similar, and fatigue life is better than oil quenching.
032 73 synthetic quenching agent
[Introduction] The quenching agent belongs to the film-forming quenching medium. It has no harmful gas, non-combustible, and the waste liquid can be released after dilution without polluting the environment. The medium is economical, convenient and easy to mix. It can be diluted with water when used. For example, it can be diluted to 0.1% to 0.3% of polyvinyl alcohol (mass fraction). The concentration should be slightly higher in winter than in summer, and should be slightly higher for alloy steel than carbon steel.
[Quenching and cooling characteristics] Its cooling rate in the high temperature zone is similar to that of water, but the low temperature zone is slower than water. With the decrease of the concentration of PVA aqueous solution, the cooling rate is similar to water in the interval of 750-450 °C, and similar to oil in the interval of 450-250 °C.
The polyvinyl alcohol aqueous solution has a usual concentration (mass fraction) of 0.1% to 0.3%, and its cooling ability is between water and oil. The solution has low cooling capacity in the high and low temperature zones, high cooling capacity in the middle temperature zone, and good quenching and cooling characteristics. The CP value is shown in Table 2-7.
[Quenching agent composition] It is preferred to use a polyvinyl alcohol having a degree of polymerization of 1750 and an alcoholysis degree of 88%. The concentration of the aqueous solution (mass fraction) is 10%, and a rust preventive, a preservative, an antifoaming agent, and the like are added.
The composition is: polyvinyl alcohol 10%, triethanolamine 1%, sodium nitrite 1%, sodium benzoate 0.4%, sulfonated castor oil 0.02%, water 87.58%.
ã€The main purpose】
1 can be used for the overall quenching of medium carbon steel and medium carbon low alloy steel, such as quenching of workpieces such as 45, 40Cr, 40MnB and 42CrMn steel.
7 It is used for induction heating spray quenching of steel parts such as 40cr, 40MnB and 42CrMo, which can basically avoid quenching cracking and reduce deformation.
3 The medium is not suitable for immersion quenching when the salt furnace is heated.
[Precautions for use]
1 Sodium nitrite is toxic, and it will produce carcinogens. It should be replaced with other non-toxic rust inhibitors. The use temperature is 25 to 45 °C.
2 Recommended optimum concentration (mass fraction): 0.2% to 0.3% polyvinyl alcohol, temperature between 20 and 50 °C.
3 When cooling in a higher concentration medium, a film will remain on the surface of the workpiece and can be removed by washing with a 5% phosphoric acid aqueous solution.
4 should also pay attention to the sink and heating pipe cleaning, otherwise it will accelerate the deterioration of the media.
5 Because its concentration is difficult to detect and control during use, its cooling performance changes greatly, and it is easy to mold and smell. When the solution is melted and then melted, the viscosity will decrease and the cooling performance will be deteriorated. When induction hardening, the precipitated polyvinyl alcohol will block the spray hole of the induction coil. Currently abroad has been discontinued.
033 74 synthetic quenching agent
[Introduction] Domestic polyvinyl alcohol synthetic quenching agent, non-toxic, no harmful gas, non-combustible, the waste liquid after the medium can be diluted after dilution, and does not pollute the environment. The medium is economical, convenient and easy to mix. The quenching agent has an improved rust and corrosion resistance than the 73 type synthetic quenching agent.
[Quenching agent composition] Quenching agent component (mass fraction): 10% polyvinyl alcohol (degree of polymerization 1750, degree of alcoholysis 66%), 1% triethanolamine, 0.2% sodium benzoate, 0.02% Taikoo oil, and the remainder is water.
Sodium benzoate acts as a preservative, and Taikoo oil increases the surface activity of the medium.
[Quenching and cooling characteristics] The quenching agent has a cooling rate between water and oil. The medium with a concentration (mass fraction) of 0.1% to 0.3% is taken as an example: in the high temperature region, the average cooling rate is 288 to 342 ° C / s, and Water is similar; in the low temperature region, the average cooling rate is 126-173 ° C / s, much slower than water. Thus, the medium has good quenching and cooling characteristics.
ã€The main purpose】
1 The synthetic quenching agent has remarkable effects on solving the cracking and deformation overshoot of common medium carbon steel and low alloy medium carbon steel parts. For example, in the case of high-frequency quenching of gasoline engine and diesel engine 45 steel parts, the use of water spray cooling is prone to cracks, and the emulsion is cooled, and the hardness is not up to the technical requirements, so it is fully qualified.
2 It is used for induction heating spray quenching of 40Cr, 40MnB, 42CrMo and other steel parts, which can basically avoid quenching cracking and reduce deformation.
[Precautions for use]
1 In the use of reasonable choice of quenching specifications, the recommended use concentration (mass fraction): 0.2% ~ 0.3% polyvinyl alcohol, the temperature is between 20 ~ 50 °C.
2 The medium is not suitable for immersion quenching in the heating of a salt furnace.
3 If it is cooled in a medium with a high concentration, a film is left on the workpiece and can be removed by washing with a 5% phosphoric acid aqueous solution.
4 should also pay attention to the sink and heating pipe cleaning, otherwise it will accelerate the deterioration of the media.
034 Japanese Patent Polyvinyl Alcohol Medium I
[Introduction] Japanese patented polyvinyl alcohol aqueous solution I, the cooling performance of the medium mainly depends on dry polyvinyl alcohol, and each additive is intended to improve other effects of the medium. For example, triethanolamine is a rust inhibitor, silicone oil is an antifoaming agent, and formalin or salicyl alcohol is a preservative.
Quenching agent formula (mass fraction): alcoholysis degree 70-90, polymerization degree 1500-2000, 15% polyvinyl alcohol, 0.5%-1.5% triethanolamine, 0.0001%-0.0003% silicone oil, 0.1%-0.2% fore Marlin or water alcohol, 0.01% blue or red water-soluble dye, the rest is water.
[Main use] It is used for induction heating spray quenching of steel parts such as 40Cr, 40MnB and 42CrMo.
035 Japanese Patent Polyvinyl Alcohol Medium II
[Introduction] It is the same as 034 Japanese Patent Polyvinyl Alcohol Medium 1.
Quenching agent formula (mass fraction): alcoholysis degree 70-90, polymerization degree 1500-2000, 12% polyvinyl alcohol, 1% triethanolamine, 0.0002% silicone oil, 0.1% formalin or salicyl alcohol, 0.01% blue Color or red water-soluble dye, the rest is water.
[Main use] It is used for induction heating spray quenching of steel parts.
036 US polyvinyl alcohol aqueous solution
[Introduction] The medium is supplied by American International Harvester Company. It is generally formulated into a concentrate, which is diluted with water. Adjusting the concentration and temperature of the solution gives a different cooling capacity between water and oil. The usual concentration (mass fraction) is 0.05% to 0.3%, and the liquid temperature is 25 to 45 °C.
Quenching agent formula (mass fraction): DuPont ELvanoL 50 ~ 42 grade, 15.28% polyvinyl alcohol, DuPont shiManA 40% preservative, Antifoama 0.4% defoamer, increase surface activity, the rest is water.
ã€The main purpose】
1 The medium can be used as a cooling medium for induction heating quenching.
2 International Harvester Company used 0.1% polyvinyl alcohol aqueous solution for induction heating quenching of φ32in1045 steel large gear, which can significantly improve the fatigue life of gears compared with quenching water.
037 polyglycol aqueous solution
[Introduction] At room temperature, the polyglycol is completely dissolved in water, and when the liquid temperature rises to about 75 °C, the polyglycol is precipitated from the water, which can form a deposited film on the surface of the hot workpiece, which slows down the cooling process of the metal. When the liquid temperature drops below 75 ° C, the film re-dissolves and disappears. Polyglycols also exhibit reverse solubility.
[Quenching and cooling characteristics] The cooling capacity is affected by the concentration of the medium. When the concentration of the aqueous solution of the polyglycol is 3% to 5% by volume, the polyglycol has a wetting effect on the vapor film, destroying the formation of the vapor film and shortening the vapor. In the film cooling stage, soft spots can be avoided in the quenched parts, and the cooling rate is close to that of water. The 15% to 30% aqueous solution of polyglycol significantly reduces the cooling rate due to the formation of a thick film on the metal surface, and its cooling ability is similar to that of oil. By adjusting the concentration, temperature and agitation of the aqueous solution of the polyglycol, various cooling rates from brine to oil can be obtained.
ã€The main purpose】
1 Mainly used as a quenching oil substitute, it has a good effect in the automotive, aerospace and engineering machinery industries.
The steel grades to be treated include carbon structural steels such as AISI to 1080, alloy steels, spring steels, and ductile irons, as well as solid solution treatment and cooling of aluminum alloy parts.
3 Tests show that the use of a certain concentration range of polymer water quenching medium instead of lead bath cooling can meet the requirements of steel wire structure and performance.
038 KR6l80 quenching agent
[Introduction] KR6180 quenching agent is a mature environmentally friendly water-soluble quenching stalk with high high, medium and low temperature cooling rates. 5% or so of KR6l80 quenching agent, high temperature and cold speed faster than water. The low temperature and cold speed are comparable to water. The quenching agent vapor film stage is extremely short, and the high temperature cooling rate is fast, so that the workpiece can obtain a high and uniform quenching hardness.
The medium has excellent rust and corrosion resistance to the workpiece, the quenching tank and the cooling circulation system. It is not easy to age, deteriorate, and has a long service life. No fumes, no burning, no fire hazard, and clean production environment.
The concentration is usually 5% to 10%, and the use temperature is 5 to 45 °C.
[Typical physical and chemical properties]
Appearance: translucent viscous liquid
pH: 8-11
ã€The main purpose】
1 Suitable for integral or continuous quenching of larger size alloy steels 15CrMo, 20CrMo, 20CrMnTi, 35CrMo, 40Cr, 40MnB, 42CrMo, etc.
2 medium and large size carbon steel, A3, 08, 10, 20, 35, ML35, 35K, 45, etc., or continuous quenching.
3 Applicable furnace type: mesh belt furnace, stepping furnace, casting chain furnace, push rod furnace, drum furnace, well furnace, rotary hearth furnace.
039 KR6280 quenching agent
[Introduction] KR6280 quenching agent is a mature environmentally-friendly water-soluble quenching agent. After quenching, the workpiece has high hardness and uniformity, and can reduce quenching deformation and prevent water quenching. By adjusting the concentration of the quenching agent, different cooling rates can be obtained. The medium has excellent rust and corrosion resistance to the workpiece, the quenching tank and the cooling circulation system. It is not easy to age, deteriorate, and has a long service life. No fumes, no burning, no fire hazard, and clean production environment.
The concentration is usually 5% to 10%, and the use temperature is 10 to 45 °C.
[Typical physical and chemical properties]
Appearance: translucent viscous liquid
pH: 8-11
ã€The main purpose】
1 can effectively solve the problem of quenching cracking and oil quenching of workpiece water (salt water, alkaline water) such as 35, 45, 35CrMo, 40Cr, 40MnB, 42CrMo.
2 Applicable furnace type: mesh belt furnace, stepping furnace, casting chain furnace, push rod furnace, liquid cylinder furnace, well type crucible, rotary bottom furnace.
3 Suitable for medium and high frequency induction heating quenching of workpieces such as gears and camshafts.
4 Especially suitable for the whole or continuous quenching of workpieces such as standard parts, shaft parts, forgings, springs and hardware tools.
040 KR6480 quenching agent
[Introduction] KR6480 quenching agent is a mature environmentally-friendly water-soluble quenching agent. After quenching, the workpiece has high hardness and uniformity, and can reduce quenching deformation and prevent water quenching. By adjusting the concentration of the quenching agent, different cooling rates can be obtained. The medium has excellent rust and corrosion resistance to the workpiece, the quenching tank and the cooling circulation system. It is not easy to age, deteriorate, and has a long service life. No fumes, no burning, no fire hazard, and clean production environment.
The use concentration is 5% to 20%, and the use temperature is 10 to 45 °C.
[Typical physical and chemical properties]
Appearance: translucent viscous liquid
pH: 8 ~ 1l
ã€The main purpose】
1Applicable to medium and high frequency induction heating quenching of workpieces such as gears and camshafts.
2 Applicable furnace type: mesh belt furnace, stepping furnace, casting chain furnace, push rod furnace, drum furnace, well furnace, rotary hearth furnace.
3 can effectively solve the problem of quenching cracking and oil quenching of workpiece water (salt water, alkaline water) such as 35, 45, 35CrMo, 40Cr, 40MnB, 42CrMo.
4 Especially suitable for the whole or continuous quenching of workpieces such as standard parts, shaft parts, forgings, springs and hardware tools.
2 Pillow Block Bearing Sucfc204-212,Pillow Block Bearing Seat Sucfc204-212,Pillow Block Bearing Sucfc204-212 Sizes
Jiangsu Dingtian Stainless Steel Products Co., Ltd. , https://www.dingtiancasting.com