Knowledge of galvanized sheet trade
Hot-dip galvanized sheets often use in industries such as automobiles, household appliances, construction, machinery, electronics, and light industry.
B) Classification of galvanizing in steel mills
There are two types of galvanizing products produced in iron and steel plants: electro galvanizing and hot-dip galvanizing. However, these two types can further subdivide.
In electro-galvanized zinc, the thickness of the zinc layer is divided into single-sided, double-sided, and poor-thickness coatings.
Hot-dip galvanizing does not have single-sided and poor-thickness coatings.
But hot-dip galvanizing divide into galvanized and galvanized iron alloys, and electroplating does not have zinc-iron alloys.
The plating layer on the plating type extended to electro-galvanized zinc, electro-galvanized nickel, electro-plated tin, electro-chromium,
and hot-dip galvanized more extended, including hot-dip galvanized, zinc iron, aluminum zinc, zinc-aluminum, and zinc-aluminum magnesium wait.
C) Annealing method
The annealing methods of conventional cold-rolled coated products are two types: continuous retreat and cover retreat
D) Common steel types
Product categories: general commodity rolls (CQ), deep-drawn hot-dip galvanized sheets (DQ), ultra-deep drawn hot-dip galvanized sheets (DDQ-EDDQ / SEDDQ),
structural galvanized sheets (HSLA), baking hardened hot-dip galvanized Plate (BH), dual-phase steel (DP),
TRIP steel (phase transformation induced plasticity steel), etc., complex phase steel (CP), etc.
E) Defects of hot-dip galvanizing
Zinc layer peeling, scratches, passivation spots, zinc particles, thick edges, air knife streaks, air knife scratches, exposed steel, inclusions,
mechanical damage, the poor performance of the steel base, wave edges, scoops, different sizes, pressure Printing, zinc layer thickness difference, roller printing, etc.
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