Quality control process
2017-08-21
? ? ? ?A wire, detection 1, material size detection, detection of 2 material hardness 3, material testing chemical composition two, 1, six in the blank detection angle depth detection 2, six angle on the edge detection, 3 blank od 4, blank length detection three, thread detection 1, thread gage 2. Detection of thread diameter detection 3, thread bottom diameter, thread diameter detection test 4 four, heat treatment and heat treatment hardness test 1 Test 2, heat treatment five, 1 Black torque detection detection, detection of blackening the surface 2, black 3, black salt spray test after mixing six detection and packaging 1 packing number detection
