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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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