Dx51d Z150 Galvanized Steel Coil ASTM A653 Z100 Hot Dip Gi Coil Sheet

GI Steel Metal Coil Zinc Coated Z100 Hot-Dip Galvanized Slightly Oiled Hot Rolled Based

Appearance of galvanized steel coil

(1)Galvanized coil is inferior to the former in terms of weld ability, coating properties and form ability. For a long time, the stamping form ability, spot weld ability and surface quality of galvanized GI steel sheets for automobiles have been a problem, which also limits its application in automobile outer panels. Automotive assembly requires 3000-4000 solder joints. Compared with ordinary cold plate, the electrode life of hot-dip galvanized sheet welding is lower, that is, the number of consecutive spot welding of the same electrode is less.

(2)Surface state: Galvanized sheet has different surface states due to different treatment methods in the coating process, such as ordinary spangle, fine spangle, flat spangle, non-spangle and phosphating surface. German standards also specify surface levels.

(3) The galvanized coil should have a good appearance, and there should be no defects that are harmful to the use of the product, such as no coating, holes, cracks, scum, excessive thickness of the coating, scratches, chromic acid dirt, white rust, etc. Foreign standards are not very clear about the specific appearance defects.