Bright chromium-manganese alloy steel quenching oil and its preparation method

Abstract

The technical scheme of the present application discloses a bright chromium-manganese alloy steel quenching oil and a preparation method thereof, the bright chromium-manganese alloy steel quenching oil comprises the following components in percentage by mass: base oil 85-93%, rapid cooling agent 2.5-7.5%, antioxidant 0.7-2.8%, dispersant 2.8-5.0%, and brightener 0.1-0.8%. The brightness of the bright chromium-manganese alloy steel quenching oil reaches the first level, and the brightener in the bright chromium-manganese alloy steel quenching oil can effectively prevent non-oil-soluble substances and carbon black and other substances in the quenching oil at high temperature from adhering to the surface of the workpiece, so that the chromium-manganese alloy steel workpiece has a high gloss, thereby eliminating the need for post-processing of the quenched chromium-manganese alloy steel workpiece, and further improving the production efficiency and reducing the production cost.

Description

Technical Field

[0001] This invention relates to the field of quenching oil technology, and in particular to a bright chromium-manganese alloy steel quenching oil and its preparation method. Background Technology

[0002] Chromium-manganese alloy steel contains elements such as iron, carbon, manganese, chromium, and silicon. It is widely used in manufacturing, automotive, petrochemical, and mining industries, and is also the most common bearing material. It is cheaper, harder, and has a longer service life than stainless steel. Its overall performance can be further improved through heat treatment. Common heat treatment types include annealing, normalizing, quenching, and tempering. Quenching involves heating the steel to a temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel), holding it at that temperature for a period of time to achieve complete or partial austenitization, and then rapidly cooling it to below Ms (or isothermally near Ms) at a rate greater than the critical cooling rate to induce martensitic (or bainitic) transformation. However, chromium-manganese alloys are highly sensitive to the gloss of quenching oil. Quenching with ordinary quenching oil with poor gloss results in a poor surface finish and is prone to localized darkening. Therefore, post-processing of the quenched workpieces is necessary, significantly impacting production efficiency and increasing production costs.

[0003] In existing technologies (CN113174471A, CN113061693A, CN 111471842A, etc.), bright quenching oils with different cooling rates can be obtained by adding polymer additives of different properties to mineral oil. The main component of these additives is brightener, which suspends aging products that are insoluble in oil, preventing their accumulation and precipitation on the workpiece. The described quenching oil has good cooling performance, brightness, and thermal oxidation stability. CN109706294A discloses a heat treatment quenching method for high-chromium alloy wear-resistant steel forgings, which uses water and air as quenching media to quench the high-chromium alloy wear-resistant steel forgings, solving to some extent the problems of water quenching cracking and poor surface quality of oil-quenched workpieces. However, at present, there is relatively little publicly available information on quenching oils applied to chromium-manganese alloy steels. Summary of the Invention

[0004] The main objective of this invention is to provide a bright quenching oil for chromium-manganese alloy steel, which aims to improve the gloss of the surface of chromium-manganese alloy steel workpieces.

[0005] The present invention provides a bright chromium-manganese alloy steel quenching oil, which comprises the following components by mass percentage: 85%-93% base oil, 2.5%-7.5% quick-cooling agent, 0.7%-2.8% antioxidant, 2.8%-5.0% dispersant, and 0.1%-0.8% brightener.

[0006] In one embodiment, the bright chromium-manganese alloy steel quenching oil comprises the following components by mass percentage: 88%-90% base oil, 4.5%-5.5% quick-cooling agent, 1.5%-2.0% antioxidant, 3.7%-4.0% dispersant, and 0.3%-0.6% brightener.

[0007] In one embodiment, the bright chromium-manganese alloy steel quenching oil has a kinematic viscosity of 18-23 mm at 40°C. 2 The kinematic viscosity at 100℃ is 3.8-4.8 mm / s. 2 / s.

[0008] The present invention also proposes a bright chromium-manganese alloy steel quenching oil, wherein the bright chromium-manganese alloy steel quenching oil comprises, by mass percentage, the following components: base oil 85%-93%, dispersant 2.8%-5.0%, polyisobutylene 4.5%-5.5%, sulfide alkylphenol calcium 0.5%-1.5%, alkylated diphenylamine 0.2%-0.8%, copolymer of heptadecanostearate and N-oleoylsarcosine octadecylamine salt 0.2%-0.5%, and imidazoline oleate 0.1%-0.4%.

[0009] In one embodiment, the base oil is one or two of 10# white oil, 15# white oil, 150N, or 100N.

[0010] In one embodiment, the dispersant is polyisobutylene succinimide.

[0011] The present invention also proposes a bright chromium-manganese alloy steel quenching oil, wherein the bright chromium-manganese alloy steel quenching oil comprises the following components by mass percentage: 2.5%-7.5% quick-cooling agent, 0.7%-2.8% antioxidant, 0.1%-0.8% brightener, 2.8%-5.0% polyisobutylene succinimide, 0-93% 10# white oil, 0-93% 15# white oil, 0-35% 100N, and 0-25% 150N.

[0012] In one embodiment, the brightener is one or both of a copolymer of heptadecanostearate and N-oleoylsarcosine octadecylamine salt or imidazoline oleate.

[0013] In one embodiment, the rapid cooling agent is polyisobutylene.

[0014] In one embodiment, the antioxidant is one or both of alkylphenol calcium sulfide and alkyl diphenylamine.

[0015] The present invention also proposes a method for preparing a bright chromium-manganese alloy steel quenching oil, comprising the following steps:

[0016] Step 1: Add the base oil to the reactor and start stirring and heating until the temperature reaches 55±5℃;

[0017] Step 2: Add the quick-cooling agent, antioxidant, and brightening agent in sequence, and circulate and stir for 2 hours;

[0018] Step 3: Add dispersant and continue stirring for 1 hour;

[0019] Step 4: Heat the reactor to 105±5℃ and stir and circulate for 2 hours to remove water;

[0020] Step 5: Check if the water content is qualified. If the water content is ≤300ppm, the water content is qualified; if the water content is >300ppm, continue heating to remove water according to Step 4.

[0021] The technical solution of this invention, through the proposed bright chromium-manganese alloy steel quenching oil, can effectively prevent non-oil-soluble substances and carbon black and other substances in the quenching oil at high temperatures from adhering to the surface of the workpiece, so that the surface of the chromium-manganese alloy steel workpiece has a high gloss, thus eliminating the need for post-processing of the quenched chromium-manganese alloy steel workpiece, thereby improving production efficiency and reducing production costs.

[0022] Furthermore, by combining different types of additives (rapid cooling agents, antioxidants, dispersants, and brighteners) with different base oils, quenching oils with excellent comprehensive performance suitable for chromium-manganese alloy steel workpieces can be formed. The quenching oil proposed in this invention has a water content controlled below 300 ppm. This low water content reduces the impact of the quenching oil on the quality of the quenched workpiece, reducing the possibility of soft spots, quenching cracks, deformation, and oil splashing. The quenching oil can prevent premature oxidation and aging, thereby greatly extending its service life and effectively reducing usage costs. The quenching oil has a high cooling rate, with a maximum cooling rate exceeding 100℃ / s, enabling supercooled austenite to reach the martensitic transformation temperature range at a high cooling rate, exhibiting good hardening and hardening capabilities. The chromium-manganese alloy steel workpieces quenched with this quenching oil exhibit excellent mechanical properties. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention proposes a bright chromium-manganese alloy steel quenching oil, which comprises the following components by mass percentage: 85%-93% base oil, 2.5%-7.5% quick-cooling agent, 0.7%-2.8% antioxidant, 2.8%-5.0% dispersant, and 0.1%-0.8% brightener.

[0025] Optionally, the composition may include 88%-90% base oil, 4.5%-5.5% quick-cooling agent, 1.5%-2.0% antioxidant, 3.7%-4.0% dispersant, and 0.3%-0.6% brightener.

[0026] This invention also proposes a bright chromium-manganese alloy steel quenching oil, which, by mass percentage, comprises the following components: 85%-93% base oil, 2.8%-5.0% dispersant, 4.5%-5.5% polyisobutylene, 0.5%-1.5% sulfide alkylphenol calcium, 0.2%-0.8% alkylated diphenylamine, 0.2%-0.5% copolymer of heptadecanostearate and N-oleoylsarcosine octadecylamine salt, and 0.1%-0.4% imidazoline oleate.

[0027] This invention also proposes a bright chromium-manganese alloy steel quenching oil, which, by mass percentage, comprises the following components: 2.5%-7.5% quick-cooling agent, 0.7%-2.8% antioxidant, 0.1%-0.8% brightener, 2.8%-5.0% polyisobutylene succinimide, 0-93% #10 white oil, 0-93% #15 white oil, 0-35% 100N, and 0-25% 150N.

[0028] This invention also provides a method for preparing a bright chromium-manganese alloy steel quenching oil, comprising the following steps:

[0029] Step 1: Add the base oil to the reactor and start stirring and heating until the temperature reaches 55±5℃;

[0030] Step 2: Add the quick-cooling agent, antioxidant, and brightening agent in sequence, and circulate and stir for 2 hours;

[0031] Step 3: Add dispersant and continue stirring for 1 hour;

[0032] Step 4: Heat the reactor to 105±5℃ and stir and circulate for 2 hours to remove water;

[0033] Step 5: Check if the water content is qualified. If the water content is ≤300ppm, the water content is qualified; if the water content is >300ppm, continue heating to remove water according to Step 4.

[0034] The raw materials used in the preparation process are as follows:

[0035] The base oil is refined hydrogenated mineral oil.

[0036] 10# White Oil: Foshan Jinjian Lubricating Oil Co., Ltd., kinematic viscosity at 40℃ is 10.9 mm. 2 / s, viscosity index is 79;

[0037] 15# White Oil: Guangdong Zhonghai Nanlian Energy Co., Ltd., kinematic viscosity at 40℃ is 14.22 mm. 2 / s, viscosity index is 122;

[0038] 100N: Beili Lubricating Oil (Beijing) Co., Ltd., kinematic viscosity at 40℃ is 23.31 mm. 2 / s, viscosity index is 124;

[0039] 150N: Guangdong Zhonghai Nanlian Energy Co., Ltd., kinematic viscosity at 40℃ is 32.91 mm. 2 / s, viscosity index is 144;

[0040] Benztriazole fatty amine salts: Jinzhou Antai Lubricating Oil Additives Co., Ltd.

[0041] Polyisobutylene: Shandong Hongrui New Material Technology Co., Ltd.;

[0042] Alkylphenol calcium sulfide: Jinzhou Xinxing Petroleum Additives Co., Ltd.;

[0043] Alkylated diphenylamine: Shanghai Hans Chemical Co., Ltd.;

[0044] Thiophanate butyrate zinc salt: Jiangsu Boer Petroleum Additives Co., Ltd.

[0045] Polyisobutylene succinimide: Guangzhou Ruishengyan Chemical Technology Co., Ltd.;

[0046] Sodium polyacrylate: Guangzhou Daoning Chemical Co., Ltd.;

[0047] Heptadecane stearate: Hubei Jusheng Technology Co., Ltd.;

[0048] N-Oleoylsarcosine Octadecylamine Salt: Hubei Chengfeng Chemical Co., Ltd.;

[0049] Imidazolinone oleate: Jinzhou Shengda Chemical Co., Ltd.;

[0050] The present invention will now be described in detail with reference to the embodiments.

[0051] The following components are calculated as a percentage by mass.

[0052] Example 1:

[0053] Step 1: Add the base oil (88.9% of No. 10 white oil) to the reactor, and start stirring and heating until the temperature reaches 55±5℃;

[0054] Step 2: Add the quick-cooling agent (5% polyisobutylene), antioxidant (1% calcium alkylphenol sulfide and 0.5% alkylated diphenylamine) and brightener (0.3% copolymer of heptadecanostearate and N-oleoylsarcosine octadecylamine salt and 0.3% imidazoline oleate) in sequence, and circulate and stir for about 2 hours;

[0055] Step 3: Add the dispersant (4% polyisobutylene succinimide) and continue stirring for 1 hour;

[0056] Step 4: Heat the reactor to 105℃ and stir and circulate for about 2 hours to remove water;

[0057] Step 5: Check if the water content is within the acceptable range (≤300ppm). If the water content is too high, continue heating to remove water as per Step 4.

[0058] Example 2:

[0059] Step 1: Add the base oil (88.9% of 15# white oil) to the reactor, and start stirring and heating until the temperature reaches 55±5℃;

[0060] Step 2: Add the quick-cooling agent (5% polyisobutylene), antioxidant (1% calcium alkylphenol sulfide and 0.5% alkylated diphenylamine) and brightener (0.3% copolymer of heptadecanostearate and N-oleoylsarcosine octadecylamine salt and 0.3% imidazoline oleate) in sequence, and circulate and stir for about 2 hours;

[0061] Step 3: Add dispersant (4% polyisobutylene succinimide) and continue stirring for 1 hour;

[0062] Step 4: Heat the reactor to 105℃ and stir and circulate for about 2 hours to remove water;

[0063] Step 5: Check if the water content is within the acceptable range (≤300ppm). If the water content is too high, continue heating to remove water as per Step 4.

[0064] Example 3:

[0065] Step 1: Add the base oil (59.7% of 10# white oil and 29.2% of 100N) to the reactor, and start stirring and heating until the temperature reaches 55±5℃;

[0066] Step 2: Add the quick-cooling agent (5% polyisobutylene), antioxidant (1% calcium alkylphenol sulfide and 0.5% alkylated diphenylamine) and brightener (0.3% copolymer of heptadecanostearate and N-oleoylsarcosine octadecylamine salt and 0.3% imidazoline oleate) in sequence, and circulate and stir for about 2 hours;

[0067] Step 3: Add dispersant (4% polyisobutylene succinimide) and continue stirring for 1 hour;

[0068] Step 4: Heat the reactor to 105℃ and stir and circulate for about 2 hours to remove water;

[0069] Step 5: Check if the water content is within the acceptable range (≤300ppm). If the water content is too high, continue heating to remove water as per Step 4.

[0070] Example 4:

[0071] Step 1: Add the base oil (59.7% of 10# white oil and 29.2% of 150N) to the reactor, and start stirring and heating until the temperature reaches 55±5℃;

[0072] Step 2: Add the quick-cooling agent (5% polyisobutylene), antioxidant (1% calcium alkylphenol sulfide and 0.5% alkylated diphenylamine) and brightener (0.3% copolymer of heptadecanostearate and N-oleoylsarcosine octadecylamine salt and 0.3% imidazoline oleate) in sequence, and circulate and stir for about 2 hours;

[0073] Step 3: Add dispersant (4% polyisobutylene succinimide) and continue stirring for 1 hour;

[0074] Step 4: Heat the reactor to 105℃ and stir and circulate for about 2 hours to remove water;

[0075] Step 5: Check if the water content is within the acceptable range (≤300ppm). If the water content is too high, continue heating to remove water as per Step 4.

[0076] Example 5:

[0077] Step 1: Add the base oil (88.9% of No. 10 white oil) to the reactor, and start stirring and heating until the temperature reaches 55±5℃;

[0078] Step 2: Add the quick-cooling agent (5% polyisobutylene), antioxidant (1% calcium alkylphenol sulfide and 0.5% alkylated diphenylamine) and brightener (0.4% heptadecanostearate and N-oleoylsarcosine octadecylamine salt copolymer and 0.2% imidazoline oleate) in sequence, and circulate and stir for about 2 hours;

[0079] Step 3: Add dispersant (4% polyisobutylene succinimide) and continue stirring for 1 hour;

[0080] Step 4: Heat the reactor to 105℃ and stir and circulate for about 2 hours to remove water;

[0081] Step 5: Check if the water content is within the acceptable range (≤300ppm). If the water content is too high, continue heating to remove water as per Step 4.

[0082] Example 6:

[0083] Step 1: Add the base oil (88.9% of 15# white oil) to the reactor, and start stirring and heating until the temperature reaches 55±5℃;

[0084] Step 2: Add the quick-cooling agent (5% polyisobutylene), antioxidant (1% calcium alkylphenol sulfide and 0.5% alkylated diphenylamine) and brightener (0.4% heptadecanostearate and N-oleoylsarcosine octadecylamine salt copolymer and 0.2% imidazoline oleate) in sequence, and circulate and stir for about 2 hours;

[0085] Step 3: Add dispersant (4% polyisobutylene succinimide) and continue stirring for 1 hour;

[0086] Step 4: Heat the reactor to 105℃ and stir and circulate for about 2 hours to remove water;

[0087] Step 5: Check if the water content is within the acceptable range (≤300ppm). If the water content is too high, continue heating to remove water as per Step 4.

[0088] Example 7:

[0089] Step 1: Add the base oil (59.7% of 10# white oil and 29.2% of 100N) to the reactor, and start stirring and heating until the temperature reaches 55±5℃;

[0090] Step 2: Add the quick-cooling agent (5% polyisobutylene), antioxidant (1% calcium alkylphenol sulfide and 0.5% alkylated diphenylamine) and brightener (0.4% heptadecanostearate and N-oleoylsarcosine octadecylamine salt copolymer and 0.2% imidazoline oleate) in sequence, and circulate and stir for about 2 hours;

[0091] Step 3: Add dispersant (4% polyisobutylene succinimide) and continue stirring for 1 hour;

[0092] Step 4: Heat the reactor to 105℃ and stir and circulate for about 2 hours to remove water;

[0093] Step 5: Check if the water content is within the acceptable range (≤300ppm). If the water content is too high, continue heating to remove water as per Step 4.

[0094] Example 8:

[0095] Step 1: Add the base oil (59.7% of 10# white oil and 29.2% of 150N) to the reactor, and start stirring and heating until the temperature reaches 55±5℃;

[0096] Step 2: Add the quick-cooling agent (5% polyisobutylene), antioxidant (1% calcium alkylphenol sulfide and 0.5% alkylated diphenylamine) and brightener (0.4% heptadecanostearate and N-oleoylsarcosine octadecylamine salt copolymer and 0.2% imidazoline oleate) in sequence, and circulate and stir for about 2 hours;

[0097] Step 3: Add dispersant (4% polyisobutylene succinimide) and continue stirring for 1 hour;

[0098] Step 4: Heat the reactor to 105℃ and stir and circulate for about 2 hours to remove water;

[0099] Step 5: Check if the water content is within the acceptable range (≤300ppm). If the water content is too high, continue heating to remove water as per Step 4.

[0100] Examples 1-8 were carried out according to the steps in the preparation method of bright chromium-manganese alloy steel quenching oil, with the only difference being the raw materials and the raw material ratios, as shown in Table 1;

[0101] Table 1: Mass percentage of each component in Examples 1-8

[0102]

[0103]

[0104] In other embodiments, the quick-cooling agent may also be a triazole fatty amine salt, the antioxidant may also be a zinc thiophosphate salt, and the brightener may also be sodium polyacrylate.

[0105] Cooling performance and basic physicochemical properties of various embodiments of the bright chromium-manganese alloy steel quenching oil proposed in this invention were tested. The test methods are as follows:

[0106] (1) Cooling performance test method: The test method shall be carried out in accordance with Section 7 of JB / T7951 Test method for nickel alloy probe for determining the cooling performance of industrial quenching oil.

[0107] (2) The kinematic viscosity test method shall be carried out in accordance with Section 5 of the standard test method for determination of kinematic viscosity and calculation of dynamic viscosity of petroleum products in GBT265-1988.

[0108] (3) The open flash point test method shall be carried out in accordance with Section 5 of the standard test method for determination of kinematic viscosity and calculation of dynamic viscosity of petroleum products in GBT265-1988.

[0109] (4) The pour point test method shall be carried out in accordance with Section 6 of the standard test method for the determination of pour point of petroleum products in GBT3535-2006.

[0110] (5) Moisture test method, in accordance with Section 8 of GB11133-1989 Determination of Water Content in Liquid Petroleum Products (Karl Fischer Method).

[0111] (6) The acid value test method shall be carried out in accordance with Section 4 of the Standard Test Method for Determination of Acid Value of Petroleum Products in GBT264-1983(1991).

[0112] (7) The rotating oxygen bomb test method shall be carried out in accordance with Section 9 of the Rotating Oxygen Bomb Test Method for Determination of Oxidation Stability of Lubricating Oil in SH / T0193-2008.

[0113] (8) The brightness test method shall be carried out in accordance with Appendix A of SH / T0564 Test Method for Heat Treatment Oil.

[0114] The cooling performance test results of Examples 1-8 are detailed in Table 2:

[0115] Table 2: Cooling performance test results of Examples 1-8

[0116] Cooling performance Maximum cooling rate (°C / s) HP value Example 1 105.4 1125.87 Example 2 105.18 1077.09 Example 3 101.74 1054.37 Example 4 106.32 1003.18 Example 5 103.28 1095.14 Example 6 103.97 1061.52 Example 7 102.06 1039.98 Example 8 105.94 1003.07

[0117] The test results of various basic physicochemical indicators in Examples 1-8 are detailed in Table 3:

[0118] Table 3: Test results of basic physicochemical properties in Examples 1-8

[0119]

[0120] As can be seen from the cooling performance test results in Table 2, the bright chromium-manganese alloy steel quenching oil proposed in this invention has a high cooling rate (the maximum cooling rate is above 100℃ / s), which enables the supercooled austenite to reach the martensitic transformation temperature zone at a relatively high cooling rate. It has good hardening and hardening capabilities, which is beneficial for chromium-manganese alloy steel workpieces to achieve the required hardening layer depth and hardness.

[0121] As shown in Table 3, the brightness of the bright chromium-manganese alloy steel quenching oil proposed in this invention reaches Grade 1. The brightener in the bright chromium-manganese alloy steel quenching oil can effectively prevent non-oil-soluble substances and carbon black in the quenching oil at high temperatures from adhering to the surface of the workpiece, so that the surface of the chromium-manganese alloy steel workpiece has a high gloss. Therefore, there is no need to perform post-processing on the quenched chromium-manganese alloy steel workpiece, thereby improving production efficiency and reducing production costs.

[0122] The quenching oil for bright chromium-manganese alloy steel has a low moisture content, which is controlled below 300 ppm. This reduces the impact of the quenching oil on the quality of the quenched workpiece and reduces the possibility of soft spots, quenching cracks or deformation, as well as oil splashing.

[0123] Bright chromium-manganese alloy steel exhibits good oxidation stability during quenching oil heating, with a rotating oxygen bomb time exceeding 200 minutes. This effectively prevents premature oxidation and aging of the oil, thereby significantly extending its service life and reducing operating costs.

[0124] In addition, the chromium-manganese alloy steel workpieces quenched by bright chromium-manganese alloy steel quenching oil have excellent mechanical properties and a hardness greater than 64 HRB.

[0125] The bright chromium-manganese alloy steel quenching oil proposed in this invention has a kinematic viscosity of 18-23 mm at 40℃. 2 The kinematic viscosity at 100℃ is 3.8-4.8 mm / s. 2 / s.

[0126] The bright chromium-manganese alloy steel quenching oil proposed in this invention combines different types of additives (rapid cooling agents, antioxidants, dispersants, and brighteners) with different base oils to form a quenching oil with excellent comprehensive performance suitable for chromium-manganese alloy steel workpieces.

[0127] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent transformations made using the content of the present invention under the concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A bright quenching oil for chromium-manganese alloy steel, characterized in that, The bright chromium-manganese alloy steel quenching oil comprises the following components by mass percentage: 85%-93% base oil, 2.5%-7.5% quick-cooling agent, 2.8%-5.0% dispersant, brightener, and antioxidant; wherein the antioxidant is 0.5%-1.5% calcium sulfide and 0.2%-0.8% alkyl diphenylamine, and the brightener is 0.2%-0.5% copolymer of heptadecanostearate and N-oleoylsarcosine octadecylamine salt and 0.1%-0.4% imidazoline oleate.

2. The bright chromium-manganese alloy steel quenching oil as described in claim 1, characterized in that, The bright chromium-manganese alloy steel quenching oil comprises the following components by mass percentage: 88%-90% base oil, 4.5%-5.5% quick-cooling agent, 1.5%-2.0% antioxidant, 3.7%-4.0% dispersant, and 0.3%-0.6% brightener.

3. The bright chromium-manganese alloy steel quenching oil as described in claim 1, characterized in that, The kinematic viscosity of the bright chromium-manganese alloy steel quenching oil at 40℃ is 18-23 mm. 2 The kinematic viscosity at 100℃ is 3.8-4.8 mm / s. 2 / s.

4. The bright chromium-manganese alloy steel quenching oil as described in claim 1, characterized in that, The base oil is one or two of 10# white oil, 15# white oil, 150N or 100N.

5. The bright chromium-manganese alloy steel quenching oil as described in claim 4, characterized in that, The base oils are 0-93% 10# white oil, 0-93% 15# white oil, 0-35% 100N, and 0-25% 150N.

6. The bright chromium-manganese alloy steel quenching oil as described in claim 1, characterized in that, The dispersant is polyisobutylene succinimide.

7. The bright chromium-manganese alloy steel quenching oil as described in claim 1, characterized in that, The rapid cooling agent is polyisobutylene.

8. A method for preparing a bright chromium-manganese alloy steel quenching oil, used to prepare the bright chromium-manganese alloy steel quenching oil as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Add the base oil to the reactor and start stirring and heating until the temperature reaches 55±5℃; Step 2: Add the quick-cooling agent, antioxidant, and brightening agent in sequence, and circulate and stir for 2 hours; Step 3: Add dispersant and continue stirring for 1 hour; Step 4: Heat the reactor to 105±5℃ and stir and circulate for 2 hours to remove water; Step 5: Check if the water content is qualified. If the water content is ≤300ppm, the water content is qualified; if the water content is >300ppm, continue heating to remove water according to Step 4.

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