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    Shijiazhuang wufeng thermal machinery Co.,LTD is a company

    Shijiazhuang wufeng thermal machinery Co.,LTD is a company that specialize in manufacturing the glass m-at treatment furnace. The production base locates in the convenient transport Shijiazhuang wufeng thermal machinery Co.,LTD is a company that specialize in manufacturing the
    Shijiazhuang wufeng thermal machinery Co.,LTD is a company that specialize in manufacturing the glass m-at treatment furnace. The production base locates in the convenient transport Shijiazhuang wufeng thermal machinery Co.,LTD is a company that specialize in manufacturing the

    Attentions of annealing furnace

     The specific items of annealing furnace in annealing and heating are as below:
     
      1. Annealing furnace is needed stress-relief annealing in 500 to 650 celsius degree before final thermal treatment to avoid quenching transmutation of hardening and tempering.
     
      2. The heating time should not be too long, and in a well burnt standard.
     
      3. The cooling after heating should not be too fast to avoid generating new stress.
     
      4. The annealing furnace should conduct stress-relief annealing after coping and its service life will be improved. The annealing furnace needs to excise a stree-relief annealing lower than refining temperature to avoid the parts transmutation in nitrogen after thermal refining and final coping. The performance of important working pieces or tools are insufficient after thermal treatment, the stress-relief annealing is needed before re-quenching to decline quenching transmutation. Incomplete annealing process curve, which the heating temperature is between c1 and Ac3 (or ACM), will be insulation and slowly cools down to get ferrite and pearlitic structure. The purpose of incomplete annealing is similar with complete annealing, through recrystallizion to refine grain to improve structure, remove stress and perfect cutting performance. Incomplete annealing is worse in refining grain, but it can save process time, decrease cost and increase production rate.
     
      Notes: The type of steel, workpiece dimension, shape and equipment conditions decide the specific heating temperature. The alloy steel and big size workpiece choose higher temperature. Cutting tools and molds which are strict demanded and have complex shapes, between rough machining and semifinising, need to conduct 2 or 4 hours stress-relief annealing in 600 to 700 celsius degree before quenching.

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