GP Sheets

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GP Coils and Sheets

GP Coils and Sheets <strong>GP Coils and Sheets </strong>2 GP Coils and Sheets 3
Thickness : 0.10 - 2.50 mm
(material in = 0.80 mm thickness can also be supplied in hard temper )
     
     
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 pf 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 leveled/ non stretch leveled/ skin passed
     
Stretch leveling : 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/ un-chromated & oiled
     
Oiling : 100 mg/ m2 to 1000 mg/ m2 each side
     
Monogram : On line logo can be given
     
Coil ID : 508 mm
     
Coil winding    
For soft coils : Controlled staggered ( (+/-) 10 mm)/
Straight wound =0.40 mm
     
For hard coils : Controlled staggered ( (+/-) 15 mm)
     
Coil Weight    
Thickness    
<0.25 mm : 2.0 - 6.0 t
>0.25 - 0.50 : 2.0 - 8.5 t
>0.50 - 2.50 : 5.0 - 22 t
     
Packet Weight : 1.50 -4.50 t (max)
     
Standards : IS 277, JIS G 3302, ASTM A653, AS 1397,
EN 10142, EN 10147, DIN 17162 and ES C.D7.001
     
Grades : Full hard, CQ,D/DD/LFQ & Structural
     
Lock forming quality : Guaranteed only up to thickness 1.25 mm
     
Non fluting quality : As per specification
2" mandrel thick > 0.35 mm
3" mandrel thick > 0.30 to _< 0.35 mm
5" mandrel thick _< 0.30 mm
     
Hardness    
     
Hard : 90 ( (+/-) 5 HRB) (up to 0.80 mm)
Soft : 60 ( (+/-) 5 HRB) (0.23 - 2.50 mm)
     
Identification & Making : Bar code sticker/ metal sticker

GP Coils and Sheets

This is Cold Rolled Sheets/Strips coated with zinc metal. Process is known as Galvanising. Used in roofing, paneling etc.GP sheets are normally produced by Hot Deep Galvanising of CR Sheets/Strips in liquid zinc bath. GC sheets are obtained upon corrugating of GP sheets in corrugating machine.

Although not practiced in India, GP sheets are also produced by electroplating of zinc on CR sheets/strips when the process is known as Electro-Galvanising. Galvanised coils sheets are used mainly in roofing, paneling, automobile bodies, Trunks/Boxes, Ducting, Cooler Body, etc.

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