Mold heat treatment includes mold material heat treatment and mold parts heat treatment.

模具材料热处理：在钢厂内完成，保证钢材质量，如基本力学性能，金相组织要符合标准或行业标准。特点是大型工业炉中大批量生产。

Heat treatment of die materials: it shall be completed in the steel plant to ensure the quality of steel, such as basic mechanical properties and metallographic structure, which shall comply with national standards or industrial standards. It is characterized by mass production in large industrial furnaces.

模具零件热处理：在模具制造厂完成，或热处理厂完成。特点是小批量或单件生产，工艺复杂多样，设备精良。

Heat treatment of mold parts: completed in the mold manufacturer or professional heat treatment plant. It is characterized by small batch or single piece production, complex and diverse processes and sophisticated equipment.

热处理工艺方法，分预备热处理和终热处理。常用方法有：正火、退火、淬火、调质、渗碳及氮化等，见表。

Heat treatment process includes preliminary heat treatment and final heat treatment. Common methods include normalizing, annealing, quenching, quenching and tempering, carburizing and nitriding, as shown in the table.

热作模具钢的热处理

Heat treatment of hot working die steel

易切削预硬化型热作模具钢的热处理

Heat treatment of free cutting pre hardening hot working die steel

非合金中碳热作模具钢的热处理

Heat treatment of non alloy medium carbon hot working die steel

渗C型热作模具钢的热处理

Heat treatment of C-type hot working die steel

耐腐蚀型热作模具钢的热处理

Heat treatment of corrosion resistant hot working die steel

时效硬化热作模具钢的热处理

Heat treatment of age hardening hot working die steel

热作模具钢常采用哪些热处理工艺

What heat treatment processes are often used for hot work die steel

热作模具材料的性能对模具寿命有决定性的影响，根据模具的结构和使用情况，合理选用制模材料是模具工程师的重要任务之一。模具热处理及表面强化是模具制造中的关键工艺，是保证模具质量和使用寿命的重要环节，实际使用证明，在模具失效中由于热处理不当引起的占很大比例。

The performance of hot working die materials has a decisive impact on the die life. According to the structure and use of the die, it is one of the important tasks for die engineers to reasonably select the die materials. Mold heat treatment and surface strengthening are key processes in mold manufacturing and important links to ensure mold quality and service life. The actual use has proved that improper heat treatment accounts for a large proportion of mold failure.

热作模具用途广泛，工作条件差别大，制造模具的材料范围很广。目前，冲压模、塑料模、压铸模、粉末冶金模的材料以钢为主，有些模具还可采用低熔点合金和非金属材料等。

Hot working dies have a wide range of uses and working conditions, and a wide range of materials for manufacturing dies. At present, the materials of stamping die, plastic die, die-casting die and powder metallurgy die are mainly steel. Some dies can also use low melting point alloys and non-metallic materials.

热作模具钢是制造热作模具(热锻模、热顶锻模、热挤压模和压铸模等)的金属材料。该类模具在工作时与热金属接触，模腔表面会受热升温300～400℃(热锻模)、500～800℃(热挤压模)，甚高达1000℃左右(压铸模)。由于热作模具工况条件非常恶劣，是在非常苛刻的条件下工作的，如承受各种应力及金属熔液对模具工作表面的溶蚀，在工作中反复受到炽热金属的加热和冷却介质(水、油、空气)冷却的热循环交替作用。当炽热的金属放入热作模具型腔时，型腔表面急剧升温，表层产生压应力和压应变；当金属件取出时，型腔表面由于急剧降温而受到拉应力和拉应变作用，非常容易产生热疲劳等，因此要求模具材料具有高的热强度、高温硬度、冲击韧性、淬透性和好的热稳定性和抗冷热疲劳性能等。总之，要求热作模具有良好的综合力学性能。

Hot work die steel is the metal material for manufacturing hot work dies (hot forging die, hot top forging die, hot extrusion die, die casting die, etc.). When this kind of die is in contact with hot metal during operation, the surface of the die cavity will be heated to 300 ~ 400 ℃ (hot forging die), 500 ~ 800 ℃ (hot extrusion die), or even up to about 1000 ℃ (die casting die). Because the working conditions of the hot working die are very bad, it works under very harsh conditions, such as bearing various stresses and the corrosion of the metal melt on the working surface of the die. In the work, it is repeatedly heated by the hot metal and cooled by the cooling medium (water, oil and air). When the hot metal is put into the cavity of the hot working die, the surface of the cavity rises sharply, resulting in compressive stress and strain; When the metal parts are taken out, the cavity surface is subject to tensile stress and strain due to rapid cooling, which is very easy to produce thermal fatigue. Therefore, the mold material is required to have high thermal strength, high temperature hardness, impact toughness, hardenability, good thermal stability and cold and thermal fatigue resistance. In a word, the hot working die is required to have good comprehensive mechanical properties.

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