Several typical analysis cases of objection about quality， which all presented short cracking defects on shiny surface of turning parts were gathered. The samples were tested by macroscopic observation， magnetic powder inspection， metallographic inspection and scanning electron microscope. The results showed that the nature of defect was capillary crack of original steels. Meanwhile， it pointed out that the supply and requisition parties should have unified regulation on the aspects of use demand， technical standards and production inspections. #br#
Fushun Special Steel Co.， Ltd.， Dongbei Special Steel Group， Fushun 113001， China
Abstract：Several typical analysis cases of objection about quality， which all presented short cracking defects on shiny surface of turning parts were gathered. The samples were tested by macroscopic observation， magnetic powder inspection， metallographic inspection and scanning electron microscope. The results showed that the nature of defect was capillary crack of original steels. Meanwhile， it pointed out that the supply and requisition parties should have unified regulation on the aspects of use demand， technical standards and production inspections.
2020, Vol. 38 
