Welding :Spot welding is firm and smooth, and does not weld through two layers
Winding :winding is tight, the start and end of the sheet can not be turned up
Planeness :surface unevenness is less than 0.1mm
Fineness :No crystalline fine particles (no crystalline fine particles on the cut surface)
Cut face :No obvious crack on the cutting face (no light transmission and peeling between layers)
Surface :Visually without burrs, rust, or deformation (to control deformation within tolerances)
Products :Do not contain Pb\\Cd\\Hg\\Cr\\PBBs\\PBDEs
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