CN108531694A - A kind of salt bath heat treatment method of mould steel - Google Patents
A kind of salt bath heat treatment method of mould steel Download PDFInfo
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- 150000003839 salts Chemical class 0.000 title claims abstract description 178
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 75
- 239000010959 steel Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 86
- 239000011780 sodium chloride Substances 0.000 claims description 43
- 229910001626 barium chloride Inorganic materials 0.000 claims 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims 1
- 239000001110 calcium chloride Substances 0.000 claims 1
- 229910001628 calcium chloride Inorganic materials 0.000 claims 1
- 238000000137 annealing Methods 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract 1
- 210000004185 liver Anatomy 0.000 abstract 1
- 229910001315 Tool steel Inorganic materials 0.000 description 12
- 229910001103 M42 high speed steel Inorganic materials 0.000 description 11
- 238000001816 cooling Methods 0.000 description 8
- 150000001247 metal acetylides Chemical class 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- 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
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
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- 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
- C21D1/26—Methods of annealing
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
技术领域technical field
本发明涉及一种工模具钢的盐浴热处理方法，属于工模具钢盐浴退火方法领域。The invention relates to a salt bath heat treatment method for tool and die steel, belonging to the field of salt bath annealing methods for tool and die steel.
背景技术Background technique
工模具钢(高速钢和模具钢)因具有高硬度、高耐磨性等优点，主要用于制造铣刀、刨齿刀、车刀、麻花钻等复杂切削工具，以及冷作模具、热作模具、塑料模具等精密成型模具，是高端装备制造业的重要基础材料。Tool and die steel (high-speed steel and die steel) are mainly used to manufacture complex cutting tools such as milling cutters, planer cutters, turning tools, twist drills, etc., as well as cold work molds, hot work molds, etc. Precision forming molds such as molds and plastic molds are important basic materials for high-end equipment manufacturing.
随着工模具大型化和精密化，对工模具材料的质量提出了日益严格的要求。工模具钢在制备过程中，易存在冷却速度缓慢、不同部位冷却速度差异大等问题，导致工模具材料组织粗化及不均匀、晶粒尺寸不均一，这一问题对于大规格工模具钢产品尤为明显。工模具钢组织不均匀，直接导致工模具钢性能不均匀，冷/热加工性能下降，冲击韧性恶化。With the increase in size and precision of tools and molds, the quality of tool and mold materials has become increasingly stringent. During the preparation process of tool and die steel, problems such as slow cooling rate and large difference in cooling rate between different parts are easy to exist, which lead to coarse and uneven structure of tool and die material, and uneven grain size. This problem is very important for large-scale tool and die steel products. Especially obvious. The uneven structure of tool and die steel directly leads to the uneven performance of tool and die steel, the decrease of cold/hot processing performance, and the deterioration of impact toughness.
围绕工模具钢组织均匀性问题，现有改善手段主要包括：采用粉末冶金技术，利用雾化合金粉末和热等静压，提高材料组织致密性和均匀性；改变钢液凝固冷却速度或变质处理，影响铸锭结晶过程，改善碳化物分布；采用压力加工技术，利用流变应力破碎分离碳化物，同时利用动态回复再结晶，细化晶粒组织。上述手段多集中在与初生碳化物分布、尺寸相关的组织均匀性问题，而对于二次碳化物、晶粒均匀性等组织均匀问题则无能为力。Around the uniformity of tool and die steel, the existing improvement methods mainly include: using powder metallurgy technology, using atomized alloy powder and hot isostatic pressing to improve the compactness and uniformity of the material structure; changing the solidification cooling rate of molten steel or metamorphic treatment , affect the ingot crystallization process, improve the distribution of carbides; adopt pressure processing technology, use rheological stress to break and separate carbides, and use dynamic recovery and recrystallization to refine the grain structure. Most of the above methods focus on the uniformity of the structure related to the distribution and size of primary carbides, but they are helpless for the uniformity of the structure of secondary carbides and grain uniformity.
二次碳化物、晶粒尺寸及均匀性与退火过程紧密有关。限于传热方式、传热速率等原因，现有真空退火、电退火等退火技术常存在冷却速率慢、冷却不均匀等问题，特别对大规格材尤为明显，对工模具材料性能产生严重影响。此外，与其他合金钢相比，工模具钢存在牌号多、成分复杂、批量小等特点，不同牌号材料成分差异大、临界相变温度差异明显，给常规退火工艺参数调控带来了很大挑战。Secondary carbides, grain size and uniformity are closely related to the annealing process. Limited to the heat transfer method and heat transfer rate, the existing annealing technologies such as vacuum annealing and electric annealing often have problems such as slow cooling rate and uneven cooling, especially for large-scale materials, which have a serious impact on the properties of tool and mold materials. In addition, compared with other alloy steels, tool and die steels have the characteristics of many grades, complex components, and small batches. Different grades have large differences in material composition and critical phase transition temperature, which brings great challenges to the control of conventional annealing process parameters. .
在高品质工模具钢制备过程中，特别是制备大规格的工模具材料，如何提高退火组织及性能均匀性，一直是未能有效解决的重要技术问题。In the process of preparing high-quality tool and die steel, especially the preparation of large-scale tool and die materials, how to improve the uniformity of annealed structure and properties has always been an important technical problem that has not been effectively solved.
发明内容Contents of the invention
技术问题：本发明的目的在于提供一种工模具钢的盐浴热处理方法，可提高工模具钢组织质量及晶粒均匀性，解决了工模具钢特别是大规格材退火组织不均匀、加工及使用性能不佳的问题，得到了高均匀性工模具钢盐。Technical problem: The purpose of this invention is to provide a salt bath heat treatment method for tool and die steel, which can improve the structure quality and grain uniformity of tool and die steel, and solve the problem of uneven annealing structure, processing and Using poor performance problems, high uniformity tool steel salts were obtained.
技术方案：本发明提供了一种工模具钢的盐浴热处理方法，该方法包括以下步骤：Technical solution: The present invention provides a salt bath heat treatment method for tool and die steel, the method comprising the following steps:
1)高温盐浴：将工模具钢置于840～920℃盐浴中保温，使工模具钢温度均匀；1) High-temperature salt bath: place the tool and die steel in a salt bath at 840-920°C for heat preservation, so that the temperature of the tool and die steel is uniform;
2)等温盐浴：将步骤1)高温盐浴后的工模具钢置于710～780℃盐浴中等温处理；2) Isothermal salt bath: placing the tool and die steel after the high-temperature salt bath in step 1) in a 710-780°C salt bath for isothermal treatment;
3)空冷：将步骤2)等温盐浴后的工模具钢空冷至室温,得到组织均匀的工模具钢。3) Air cooling: cooling the tool and die steel after the isothermal salt bath in step 2) to room temperature in air to obtain a tool and die steel with uniform structure.
其中：in:
步骤1)和步骤2)所用盐浴中使用的熔盐为BaCl2、NaCl、KCl、CaCl2中的二元熔盐组合或多元熔盐组合。The molten salt used in the salt bath used in step 1) and step 2) is a binary molten salt combination or a multicomponent molten salt combination of BaCl 2 , NaCl, KCl, and CaCl 2 .
所述的二元熔盐组合中两种熔盐的质量比为1～3:1～3；所述的三元熔盐组合中三种熔盐的质量比为1～3:1～3:3～5；所述的四元熔盐组合中三种熔盐的质量比为1～3:1～3:2～4:2～4。The mass ratio of the two molten salts in the binary molten salt combination is 1～3:1～3; the mass ratio of the three molten salts in the ternary molten salt combination is 1～3:1～3: 3-5; the mass ratio of the three molten salts in the quaternary molten salt combination is 1-3:1-3:2-4:2-4.
步骤1)所述的盐浴中保温的时长为15min～3h。The duration of heat preservation in the salt bath described in step 1) is 15 minutes to 3 hours.
步骤2)所述的盐浴中等温处理的时长为2h～6h。The duration of the isothermal treatment in the salt bath in step 2) is 2h to 6h.
所述的高温盐浴的温度每提高20～30℃或高温盐浴的时间每延长30～60min，则等温盐浴温度降低5～15℃且延长等温盐浴时间30～90min。When the temperature of the high-temperature salt bath is increased by 20-30°C or the time of the high-temperature salt bath is extended by 30-60 minutes, the temperature of the isothermal salt bath is reduced by 5-15°C and the time of the isothermal salt bath is extended by 30-90 minutes.
有益效果：与现有技术相比，本发明具有以下优势：Beneficial effect: compared with the prior art, the present invention has the following advantages:
1、本发明通过采用高温盐浴和等温盐浴组合，实现对退火温度及冷却速度的有效控制，克服了传统退火工艺冷速较慢、不均匀的问题；1. The present invention realizes the effective control of annealing temperature and cooling rate by adopting a combination of high-temperature salt bath and isothermal salt bath, and overcomes the problem of slow and uneven cooling rate in traditional annealing process;
2、通过采用BaCl2+NaCl复合熔盐，控制其配比为1:1，有效提高其700～900℃温度范围内的导热性，改善了工模具钢加热、冷却过程的温度及组织均匀性；2. By adopting BaCl 2 +NaCl composite molten salt and controlling its ratio to 1:1, the thermal conductivity in the temperature range of 700-900°C is effectively improved, and the temperature and structure uniformity of the heating and cooling process of tool and die steel are improved ;
3、控制高温盐浴温度及时间，并据此调控等温盐浴温度及时间，实现高温盐浴-等温盐浴的联动调控，有效控制退火过程二次碳化物析出及铁素体晶粒的尺寸及均一性；3. Control the temperature and time of high-temperature salt bath, and adjust the temperature and time of isothermal salt bath accordingly, realize the linkage regulation of high-temperature salt bath and isothermal salt bath, and effectively control the precipitation of secondary carbides and the size of ferrite grains in the annealing process and uniformity;
4、本发明提供的盐浴处理方法，不仅解决了传统退火工艺存在加热氧化、冷速较慢且不均匀的问题，同时通过联动调控高温和等温盐浴温度及时间，有效调控退火组织均匀性，提高工模具钢组织及晶粒均匀性，改善工模具钢加工及使用性能，满足了高品质工模具材料特别是大规格产品的组织及质量要求。4. The salt bath treatment method provided by the present invention not only solves the problems of heating oxidation, slow cooling rate and unevenness in the traditional annealing process, but also effectively regulates the uniformity of the annealed structure through linkage control of high temperature and isothermal salt bath temperature and time , improve the structure and grain uniformity of tool and die steel, improve the processing and performance of tool and die steel, and meet the organization and quality requirements of high-quality tool and die materials, especially large-scale products.
具体实施方式Detailed ways
本发明涉及一种工模具钢的盐浴热处理方法，具体涉及一种工模具钢的盐浴退火方法，可提高材料退火组织质量和性能，该方法的主要改进点体现在：采用高温盐浴和等温盐浴复合处理，通过高温盐浴与等温盐浴联动调控，有效控制退火组织转变，保证了工模具钢组织质量。The invention relates to a salt bath heat treatment method for tool and die steel, in particular to a salt bath annealing method for tool and die steel, which can improve the quality and performance of the annealed structure of the material. The main improvement of the method is reflected in: using high temperature salt bath and Isothermal salt bath compound treatment, through the linkage regulation of high temperature salt bath and isothermal salt bath, effectively controls the transformation of annealed structure and ensures the quality of tool and die steel structure.
以下结合具体实施例对本发明的生产工艺进行详细说明。The production process of the present invention will be described in detail below in conjunction with specific examples.
实施例1：Example 1:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M42工模具钢置于NaCl+BaCl2二元熔盐(NaCl：BaCl2质量比为1:3)进行高温盐浴处理，盐浴温度840℃，加热时间2h；(1) Put M42 tool and die steel in NaCl+BaCl 2 binary molten salt (NaCl: BaCl 2 mass ratio is 1:3) for high-temperature salt bath treatment, the salt bath temperature is 840°C, and the heating time is 2h;
(2)快速将步骤(1)高温盐浴后的M42工模具钢置于CaCl2+NaCl二元熔盐(CaCl2:NaCl＝3:1)进行等温盐浴处理，盐浴温度为780℃，等温2h；(2) Quickly place the M42 tool and die steel after the high-temperature salt bath in step (1) in CaCl 2 +NaCl binary molten salt (CaCl 2 :NaCl=3:1) for isothermal salt bath treatment, and the salt bath temperature is 780°C , isothermal for 2h;
(3)将步骤(2)等温盐浴后的M42工模具钢从盐浴取出，空冷至室温得到高组织均匀的M42工模具钢。(3) The M42 tool steel after the isothermal salt bath in step (2) is taken out from the salt bath, and air-cooled to room temperature to obtain the M42 tool steel with high structure and uniformity.
实施例2：Example 2:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M42工模具钢置于NaCl+KCl+BaCl2三元熔盐(NaCl:KCl:BaCl2质量比为2:3:5)进行高温盐浴处理，盐浴温度860℃，加热时间2h；(1) Put M42 tool and die steel in NaCl+KCl+BaCl 2 ternary molten salt (NaCl:KCl:BaCl 2 mass ratio is 2:3:5) for high-temperature salt bath treatment, salt bath temperature 860°C, heating time 2h;
(2)快速将步骤(1)高温盐浴后的M42工模具钢置于BaCl2+NaCl+KCl三元熔盐(BaCl2:NaCl:KCl质量比为2:2:4)进行等温盐浴处理，盐浴温度为775℃，等温2.5h；(2) Quickly place the M42 tool and die steel after the high-temperature salt bath in step (1) in BaCl 2 +NaCl+KCl ternary molten salt (BaCl 2 :NaCl:KCl mass ratio is 2:2:4) for isothermal salt bath For treatment, the salt bath temperature is 775°C and isothermal for 2.5 hours;
(3)将步骤(2)等温盐浴后的M42工模具钢从盐浴取出，空冷至室温得到高组织均匀的M42工模具钢。(3) The M42 tool steel after the isothermal salt bath in step (2) is taken out from the salt bath, and air-cooled to room temperature to obtain the M42 tool steel with high structure and uniformity.
实施例3：Example 3:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M42工模具钢置于BaCl2+NaCl二元熔盐(BaCl2:NaCl质量比为3:1)进行高温盐浴处理，盐浴温度840℃，加热时间3h；(1) Put M42 tool and die steel in BaCl 2 +NaCl binary molten salt (BaCl 2 :NaCl mass ratio is 3:1) for high-temperature salt bath treatment, the salt bath temperature is 840°C, and the heating time is 3h;
(2)快速将步骤(1)高温盐浴后的M42工模具钢置于CaCl2+NaCl二元熔盐(NaCl:CaCl2质量比为1:3)进行等温盐浴处理，盐浴温度为770℃，等温3h；(2) Quickly place the M42 tool and die steel after the high-temperature salt bath in step (1) in CaCl 2 +NaCl binary molten salt (NaCl:CaCl 2 mass ratio is 1:3) for isothermal salt bath treatment, and the salt bath temperature is 770°C, isothermal for 3h;
(3)将步骤(2)等温盐浴后的M42工模具钢从盐浴取出，空冷至室温得到高组织均匀的M42工模具钢。(3) The M42 tool steel after the isothermal salt bath in step (2) is taken out from the salt bath, and air-cooled to room temperature to obtain the M42 tool steel with high structure and uniformity.
实施例4：Example 4:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M42工模具钢置于NaCl+KCl+BaCl2+CaCl2四元熔盐(NaCl:KCl:BaCl2:CaCl2质量比为2:2:3:3)进行高温盐浴处理，盐浴温度920℃，加热时间15min；(1) Put M42 tool and die steel in NaCl+KCl+BaCl 2 +CaCl 2 quaternary molten salt (NaCl:KCl:BaCl 2 :CaCl 2 mass ratio is 2:2:3:3) for high temperature salt bath treatment, Salt bath temperature 920°C, heating time 15min;
(2)快速将步骤(1)高温盐浴后的M42工模具钢置于NaCl+KCl+BaCl2+CaCl2四元熔盐(NaCl:KCl:BaCl2:CaCl2质量比为2:2:3:3)进行等温盐浴处理，盐浴温度为750℃，等温4h；(2) quickly place the M42 tool and die steel after step (1) high temperature salt bath in NaCl+KCl+BaCl 2 +CaCl quaternary molten salt (NaCl:KCl:BaCl 2 :CaCl 2 mass ratio is 2:2: 3:3) Carry out isothermal salt bath treatment, the salt bath temperature is 750°C, isothermal 4h;
(3)将步骤(2)等温盐浴后的M42工模具钢从盐浴取出，空冷至室温得到高组织均匀的M42工模具钢。(3) The M42 tool steel after the isothermal salt bath in step (2) is taken out from the salt bath, and air-cooled to room temperature to obtain the M42 tool steel with high structure and uniformity.
实施例5：Example 5:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M42工模具钢置于NaCl+BaCl2+CaCl2+三元熔盐(NaCl:BaCl2:CaCl2质量比为2:3:5)进行高温盐浴处理，盐浴温度920℃，加热时间75min；(1) Put M42 tool and die steel in NaCl+BaCl 2 +CaCl 2 + ternary molten salt (NaCl:BaCl 2 :CaCl 2 mass ratio is 2:3:5) for high temperature salt bath treatment, salt bath temperature 920°C , heating time 75min;
(2)快速将步骤(1)高温盐浴后的M42工模具钢置于NaCl+KCl+BaCl2+CaCl2四元熔盐(NaCl:KCl:BaCl2:CaCl2质量比为2:2:3:3)进行等温盐浴处理，盐浴温度为735℃，等温5h；(2) quickly place the M42 tool and die steel after step (1) high temperature salt bath in NaCl+KCl+BaCl 2 +CaCl quaternary molten salt (NaCl:KCl:BaCl 2 :CaCl 2 mass ratio is 2:2: 3:3) Carry out isothermal salt bath treatment, the salt bath temperature is 735°C, isothermal for 5h;
(3)将步骤(2)等温盐浴后的M42工模具钢从盐浴取出，空冷至室温得到高组织均匀的M42工模具钢。(3) The M42 tool steel after the isothermal salt bath in step (2) is taken out from the salt bath, and air-cooled to room temperature to obtain the M42 tool steel with high structure and uniformity.
实施例6：Embodiment 6:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M35工模具钢置于BaCl2+NaCl二元熔盐(BaCl2:NaCl质量比为3:1)进行高温盐浴处理，盐浴温度840℃，加热时间2h；(1) Put M35 tool and die steel in BaCl 2 +NaCl binary molten salt (BaCl 2 :NaCl mass ratio is 3:1) for high-temperature salt bath treatment, the salt bath temperature is 840°C, and the heating time is 2h;
(2)快速将步骤(1)高温盐浴后的M35工模具钢置于NaCl+CaCl2二元熔盐(NaCl:CaCl2质量比为1:3)进行等温盐浴处理，盐浴温度为760℃，等温2h；(2) Quickly place the M35 tool and die steel after step (1) high-temperature salt bath in NaCl+CaCl binary molten salt (NaCl: CaCl The mass ratio is 1:3) for isothermal salt bath treatment, and the salt bath temperature is 760℃, isothermal for 2h;
(3)将步骤(2)等温盐浴后的M35工模具钢从盐浴取出，空冷至室温得到高组织均匀的M42工模具钢。(3) The M35 tool steel after the isothermal salt bath in step (2) was taken out from the salt bath, and air-cooled to room temperature to obtain the M42 tool steel with high structure and uniformity.
实施例7：Embodiment 7:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M35工模具钢置于NaCl+KCl+BaCl2三元熔盐(NaCl:KCl:BaCl2质量比为2:3:5)进行高温盐浴处理，盐浴温度870℃，加热时间2h；(1) Put M35 tool and die steel in NaCl+KCl+BaCl 2 ternary molten salt (NaCl:KCl:BaCl 2 mass ratio is 2:3:5) for high temperature salt bath treatment, salt bath temperature 870°C, heating time 2h;
(2)快速将步骤(1)高温盐浴后的M35工模具钢置于BaCl2+NaCl+KCl三元熔盐(BaCl2:NaCl:KCl质量比为2:2:4)进行等温盐浴处理，盐浴温度为745℃，等温3.5h；(2) Quickly place the M35 tool and die steel after the high-temperature salt bath in step (1) in BaCl 2 +NaCl+KCl ternary molten salt (BaCl 2 :NaCl:KCl mass ratio is 2:2:4) for isothermal salt bath For treatment, the temperature of the salt bath is 745°C, and the temperature isothermal for 3.5h;
(3)将步骤(2)等温盐浴后的M35工模具钢从盐浴取出，空冷至室温得到高组织均匀的M35工模具钢。(3) Take out the M35 tool and die steel after step (2) isothermal salt bath from the salt bath, and air-cool to room temperature to obtain M35 tool and die steel with high structure and uniformity.
实施例8：Embodiment 8:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M35工模具钢置于BaCl2+NaCl二元熔盐(BaCl2:NaCl质量比为3:1)进行高温盐浴处理，盐浴温度840℃，加热时间3h；(1) Put M35 tool and die steel in BaCl 2 +NaCl binary molten salt (BaCl 2 :NaCl mass ratio is 3:1) for high-temperature salt bath treatment, the salt bath temperature is 840°C, and the heating time is 3h;
(2)快速将步骤(1)高温盐浴后的M35工模具钢置于NaCl+CaCl2二元熔盐(NaCl:CaCl2质量比1:3)进行等温盐浴处理，盐浴温度为755℃，等温2.5h；(2) Quickly place the M35 tool and die steel after the high-temperature salt bath in step (1) in NaCl+CaCl 2 binary molten salt (NaCl:CaCl 2 mass ratio 1:3) for isothermal salt bath treatment, and the salt bath temperature is 755 ℃, isothermal for 2.5h;
(3)将步骤(2)等温盐浴后的M35工模具钢从盐浴取出，空冷至室温得到高组织均匀的M35工模具钢。(3) Take out the M35 tool and die steel after step (2) isothermal salt bath from the salt bath, and air-cool to room temperature to obtain M35 tool and die steel with high structure and uniformity.
实施例9：Embodiment 9:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M35工模具钢置于NaCl+KCl+BaCl2+CaCl2四元熔盐(NaCl:KCl:BaCl2:CaCl2质量比为2:2:3:3)进行高温盐浴处理，盐浴温度920℃，加热时间15min；(1) Put M35 tool and die steel in NaCl+KCl+BaCl 2 +CaCl 2 quaternary molten salt (NaCl:KCl:BaCl 2 :CaCl 2 mass ratio is 2:2:3:3) for high temperature salt bath treatment, Salt bath temperature 920°C, heating time 15min;
(2)快速将步骤(1)高温盐浴后的M35工模具钢置于NaCl+KCl+BaCl2+CaCl2四元熔盐(NaCl:KCl:BaCl2:CaCl2质量比为2:2:3:3)进行等温盐浴处理，盐浴温度为725℃，等温4h；(2) Quickly place the M35 tool and die steel after step (1) high-temperature salt bath in NaCl+KCl+BaCl 2 +CaCl quaternary molten salt (NaCl:KCl:BaCl 2 :CaCl 2 mass ratio is 2:2: 3:3) Carry out isothermal salt bath treatment, the temperature of the salt bath is 725°C, isothermal for 4h;
(3)将步骤(2)等温盐浴后的M35工模具钢从盐浴取出，空冷至室温得到高组织均匀的M35工模具钢。(3) Take out the M35 tool and die steel after step (2) isothermal salt bath from the salt bath, and air-cool to room temperature to obtain M35 tool and die steel with high structure and uniformity.
实施例10：Example 10:
一种对工模具钢的盐浴热处理方法，包括如下步骤：A kind of salt bath heat treatment method to tool steel, comprises the steps:
(1)将M35工模具钢置于BaCl2+NaCl+CaCl2三元熔盐(BaCl2:NaCl:CaCl2质量比为3:2:5)进行高温盐浴处理，盐浴温度920℃，加热时间75min；(1) Put M35 tool and die steel in BaCl 2 +NaCl+CaCl 2 ternary molten salt (BaCl 2 :NaCl:CaCl 2 mass ratio is 3:2:5) for high-temperature salt bath treatment, the salt bath temperature is 920°C, Heating time 75min;
(2)快速将步骤(1)高温盐浴后的M35工模具钢置于NaCl+KCl+BaCl2+CaCl2四元熔盐(NaCl:KCl:BaCl2:CaCl2质量比为2:2:3:3)进行等温盐浴处理，盐浴温度为710℃，等温5h；(2) Quickly place the M35 tool and die steel after step (1) high-temperature salt bath in NaCl+KCl+BaCl 2 +CaCl quaternary molten salt (NaCl:KCl:BaCl 2 :CaCl 2 mass ratio is 2:2: 3:3) Carry out isothermal salt bath treatment, the temperature of the salt bath is 710°C, isothermal for 5h;
(3)将步骤(2)等温盐浴后的M35工模具钢从盐浴取出，空冷至室温得到高组织均匀的M35工模具钢。(3) Take out the M35 tool and die steel after step (2) isothermal salt bath from the salt bath, and air-cool to room temperature to obtain M35 tool and die steel with high structure and uniformity.
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