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Defect - fish scales

Update:25 Dec 2017
Summary:

The reason Extrusion billet improper heat treatment, in […]

The reason
Extrusion billet improper heat treatment, including quenched and tempered steel after processing more common
Countermeasures
  1) As appropriate, control the hardness of quenched and tempered
  2) It is recommended to use normalizing as the pre-heat treatment of the tooth blank

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