Download Profile

#14, New Gangamachari Street, Motinagar, Bangalore - 560002

Galvanized Coils & Sheets

Hot dip galvanizing of the strip is carried out by immersing it in a zinc bath maintained at 460 degree centigrade. The chemistry of the bath is carefully controlled to ensure proper adhesion and formability of the applied zinc together with bright blemish free uniform spangles. The galvanized coils are chromated to improve its resistance to white rust. The chromating parameters are continually monitored and sheets are regularly tested through salt-spray tests to ensure the performance of this process.

Regular Galvanized

material is produced on continuous hot dip galvanizing lines by passing prepared coils through a bath of molten zinc. There are various styles available Minimized Spangle, Minimized Spangle - Extra Smooth. The zinc coatings on these products help resist corrosion due to the barrier protection and sacrificial characteristics of the coating. The required zinc coating thickness for different coating specifications is achieved as the result of passing the hot dipped strip through a variable low pressure, high volume air stream, called an "air knife."

Minimized Spangle

The coating consists of a layer of zinc on top of a very thin layer of a mixture of intermetallic compounds containing iron, aluminium and zinc. The products produced are almost "spangle" free. The surface has a bright appearance and is normally intended for plain unpainted construction applications or unexposed appliance/ automotive applications.

Zero Spangle Skin Passed

This product is skin passed or temper rolled after coating to impart a uniform matte surface appearance. It is developed for use on painted construction applications and semi-exposed automotive applications requiring an improved surface appearance.

Typical uses for Galvanized Steel

Air conditioning equipment, HVAC ductwork, wood connectors, slot machine parts, computer cabinets, TV cable boxes, building panels, display cases, electronic equipment, garbage cans, guide rails, heating equipment, highway culverts, garage doors, motor housings, washing machines and dryers, home appliances, lighting fixtures, mailboxes, outdoor signs, refrigerators and freezers, roof flashing, decking, tool boxes, vending machines, framing studs, rain gutters and downspouts.

Formability

Lends itself to most fabrication processes; it can be roll-formed, brake-formed, lock-seamed, deep drawn, and stretched. It can be joined by various methods including adhesive bonding, riveting, soldering and welding.

Paintable

Galvanized sheet metal can be readily painted before or after fabrication when the proper pre treatment is performed.

Thickness 0.10-3.0mm
  (Material in <0.80 mm thickness can also be supplied hard temper)
Thickness tolerance
0.10-0.25 mm +15 microns (spread of 30 microns)
>0.25-0.50 mm +20 microns (spread of 40 microns)
>0.50-1.0 mm +30 microns (spread of 60 microns)
>1.0 mm thickness +2.5 % of thickness or 100 microns
  (whichever is higher)
Width
Full width 760 – 1250 mm
Full width tolerance +5/-0 mm
Slit width 50-1240 mm
Slit width tolerance +0.50/-0.50 mm (spread of 1.0 mm)
Length
Length tolerance 500 – 4000 mm
Standard sheets +10/-0 mm (spread of 10 mm)
Blanks +1 mm (spread of 2 mm)
Coating 90 – 275 gsm
Edge Condition Trimmed / mill edge
Edge condition tolerance
Edge wavy coils 4 mm, 3 waves / meter
Edge wavy sheets 5 mm, 2 waves / meter
Edge Camber 2 mm max. In 2 mtr length
Other tolerances
Buckling 5 mm 2 nos. Per meter
Bow 10 mm max
Diagonal difference 5 mm max
Temper – 1 Soft / Hard
Temper – 2 Stretch levelled / non stretch levelled / skin passed
Stretch levelling 0.23 – 2.50 mm thickness
Skin passed 0.30 – 2.50 mm thickness (soft only)
Surface roughness 0.60 – 2.0 microns ( after skin passed )
Surface finish Bright / matte (regular/small/big/suppressed spangles)
Surface treatment Chromated / im-chromated & oiled
Oiling 100 mg/m2 to 1000 mg/m2 each side
Monogram Online logo can be given
Coil ID 508 mm

Copyrights © 2017 NDC Steels. All Rights Reserved.