1: heat treatment furnace annealing: refers to the metal material heated to the appropriate temperature, maintain a certain time, and then slowly cooling heat treatment process. Common annealing processes include recrystallization annealing, stress relief annealing, spheroidizing annealing, complete annealing, etc. Objective: the main purpose is to reduce the annealing hardness of metal materials, improve the plasticity, and cutting processing or machining pressure, reduce the residual stress and improve the uniformity of microstructure and composition, or after heat treatment to make organization, etc.
2：熱處理爐正火：指將鋼材或鋼件加熱到 或 （鋼的上臨界點溫度）以上，30～50℃ 保持適當時間后，在靜止的空氣中冷卻的熱處理的工藝。正火的目的：主要是提高低碳鋼的力學性能，改善切削加工性，細化晶粒，消除組織缺陷，為后道熱處理作好組織準備等。
2: normalizing heat treatment furnace: refers to the steel or steel parts (or heated to the critical point temperature of steel) above 30 to 50 DEG C to maintain an appropriate time after the heat treatment process of cooling in still in the air. Normalizing the objective: the main purpose is to improve the mechanical properties of low carbon steel, improve machinability, grain refinement, eliminate the defects, for after the heat treatment to make organization etc.
3：熱處理爐淬火：指將鋼件加熱到 Ac3 或 Ac1（鋼的下臨界點溫度）以上某一溫度，保持一定的時間，然后以適當的冷卻速度，獲得馬氏體（或貝氏體）組織的熱處理工藝。常見的淬火工藝有鹽浴淬火，馬氏體分級淬火，貝氏體等溫淬火，表面淬火和局部淬火等。淬火的目的：使鋼件獲得所需的馬氏體組織，提高工件的硬度，強度和耐磨性，為后道熱處理作好組織準備等。
3: quenching heat treatment furnace: refers to the steel parts will be heated to Ac3 or Ac1 (under the critical temperature of steel) above a certain temperature, keep a certain time, then with proper cooling rate, the martensite (or bainite) organization heat treatment process. The quenching process has common salt bath quenching, martempering, bainite isothermal quenching, surface quenching and partial quenching etc. The purpose of quenching: the steel parts to obtain the required martensite structure, improve the hardness, strength and wear resistance of the workpiece, for post heat treatment organization preparation.
4: heat treatment furnace tempering: refers to the steel parts after hardening, and then heated to a certain temperature below, holding a certain time, and then cooled to room temperature heat treatment process. Common tempering process: low temperature tempering, medium temperature tempering, high temperature tempering and multiple tempering. The purpose of tempering: mainly to eliminate the steel parts in the quenching produced by the stress, so that steel pieces with high hardness and wear resistance, and has the required plasticity and toughness, etc.
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