GALVANIZED STEEL COILS

(3) HEAT TRANSMISSION AND REFLECTIVITY:
     55% Al-Zn alloy-coated steel coil has a high reflectivity value making it an effective barrier against heat.

     Outdoor exposure testing of 55% Al-Zn alloy-coated steel coils has been conducted for over 20 years in various atmospheric environments. This testing also demonstrated a superior cut edge protection of 55% Al-Zn alloy-coated steel sheet than the galvanized steel sheet.

     The improved corrosion resistance of 55% Al-Zn alloy coated steel coils is derived from the unique combination of the barrier protection of the aluminum and the sacrificial protection of the zinc.  The formation of an insoluble aluminum oxide layer provides the barrier protection while the zinc provides a sacrificial protection at cut edges, scratches and areas of coating damage.

(2) HEAT RESISTANCE:  

(1) CORROSION RESISTANCE: 
     The improved corrosion resistance of 55% Al-Zn alloy coated steel coils is derived from the unique combination of the barrier protection of the aluminum and the sacrificial protection of the zinc.  The formation of an insoluble aluminum oxide layer provides the barrier protection while the zinc provides a sacrificial protection at cut edges, scratches and areas of coating damage.

     Outdoor exposure testing of 55% Al-Zn alloy-coated steel coils has been conducted for over 20 years in various atmospheric environments. This testing also demonstrated a superior cut edge protection of 55% Al-Zn alloy-coated steel sheet than the galvanized steel sheet.

     The mini spangle is further skin-passed to produce the extra smooth surface.

B. Grades Available: Commercial grade, lock forming grade, structural grade and drawing grade.

HOT-DIP 55PCT AL-ZN COATED STEEL COILS
     The aluminum-zinc alloy for 55% Al-Zn alloy-coated steel coils consists of 55% aluminum, 43.4% zinc and 1.6% silicon, solidified at 600

A. CHARACTERISTICS

(3) Extra Smooth :

     The spangle is restrained and formed as mini spangle by reducing the lead content in the zinc liquid or by blowing the zinc powder from the equipment installed on the zinc pot.

(2) Minimized Spangle :

     Regular spangle is also called normal spangle which is naturally formed without any additional treatment during galvanizing.

(1) Regular Spangle:

A. Surface Treatment

GALVANIZED STEEL COILS
     The zinc layer on the surface of the galvanized steel sheet isolates the steel sheet from atmosphere to prevent further corrosion of the base sheet and ensures a long service life of the base sheet, due to excellent corrosion resistance of the galvanized steel sheets.