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2022
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05
This is how the drill rod is produced.
Inspection of hollow steel-blanking according to the length of the drill rod-machining threads at both ends of the rod body (MF drill rod needs to forge female thread ends first)-machining handle groove-
Hole steel inspection-blanking according to the length of the drill rod-processing the threads at both ends of the rod body (MF drill rod needs to forge female thread ends first)-processing handle groove-deep well type carburizing furnace overall carburizing-deep well type air cooling tower air cooling quenching-deep well type tempering furnace tempering treatment-straightening-shot blasting strengthening treatment-phosphating anti-corrosion treatment-inner hole cleaning-surface painting anti-plastic sleeve-thread part-production label-storage.
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