Quality control process and accessment of Metis self drilling anchor bolt

Our quality control process contains raw material incoming inspection, Production process inspection, Finished products inspection,outgoing products inspection and solve Customer complaints. 

Inspection data should be recored. Unqualified products can't flow into next working procedure. Data for unqualified products should be analyzed and improvement measures should be proposed. 

For Metis self drilling anchor bolt, the steel we commonly used for R25 is Q345. The Steel we commonly used for other sizes like R32/R38/R51/T30/T40/T76 is 40Cr which European name is 40Cr4. The steel we commonly used for coupler is  40Cr which European name is 40Cr4.

1.The steel we commonly used for forged nut is 45# which European name is ZK45. 
2.The steel we commonly used for casting nut is Q235 which European name is SJ235. 
3.The steel we commonly used for R25/R32/R38/R51/T76/T111 plate is Q235 which European name is SJ235.
4.The steel we commonly used for T30/T40/T52/T73/T103/T127/T130 plate is 45# which European name is ZK45. 
5.The steel we commonly used for casting drill bit is 42CrMo. 
6.The steel we commonly used for tungsten carbide drill bit is 40Cr. 
7.The steel we commonly used for centralizer is QT500. 

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