Name: Galvanized Steel G90
Brand: Li Cheung Steel Factory
SKU: 236710766

galvanized steel g90 Description

We often see the following suffix codes Galvanized steel G90, Z275, G60, Z27. We must first understand what standards these coating suffixes belong to before we can make further explanations. Several galvanized coating suffixes belong to 5 mainstream standards, see the table below for details.

Standard No.	Standard Name	Unit	Typical code for equal thickness coatings	The sum of the coating weight on both sides
ASTM_653/653m_13	Technical requirements for hot-dip galvanized and zinc-iron alloy steel strip	Metric Silk Unit g/m	G30,G40,G60,G90,G100,..G300,G360	0.3,0.4,0.6,0.9,1.0,...3.0,3.6
ASTM_653/653m_13		Metric Silk Unit g/m	Z90,Z120,Z180,Z275,...Z500,Z900,Z1100	90,120,180,275,...500,900,1100
EN 10327_2004	Continuously hot-dip galvanized and electro-galvanized steel sheets and strips	Metric Silk Unit g/m	Z100,Z140,Z200,Z22,...Z450,Z6005,Z275,...Z450,Z600	100,140,200,Z22,...Z450,Z6005,Z275,...Z450,Z600
JIS G3302_2010	Hot dip steel plate and strip	Metric Silk Unit g/m	Z06,Z08,Z10,Z12,Z27,....,Z45,Z60	60,80,100,120,275...450,600
GB/T 2518_2008	Continuous hot dip steel plates and strips	Metric Silk Unit g/m	60,80,100,120,...450,600	60,80,100,120,275...450,600
Q/BQB420_2014	Hot dip galvanized/zinc-iron alloy coated steel sheet and strip	Metric Silk Unit g/m	40/40,50/50,70/70,....175/175,225/225	20,100,140,...350,450

bse metal type	Grade	CHEMICAL COMPOSITION %
bse metal type	Grade	C	Si	Mn	P
cold rolled steel sheet	DC51D+Z (St01Z, St02Z, St03Z) , DC51D+ZF	≤0.10	-	≤0.50	≤0.035
	DC52D+Z (St04Z), DC52D+ZF	≤0.08	-	≤0.45	≤0.030
	DC53D+Z (St05Z), DC53D+ZF	≤0.08	-	≤0.40	≤0.030
	DC54D+Z (St06Z), DC54D+ZF	≤0.01	≤0.10	≤0.30	≤0.025
	DC56D+Z (St07Z), DC56D+ZF	≤0.01	≤0.10	≤0.30	≤0.025
hot rolled steel sheet	DD51D+Z (St01ZR, St02ZR)	≤0.10	-	≤0.50	≤0.035
hot rolled steel sheet	DD54D+Z (St06ZR)	≤0.01	≤0.10	≤0.30

From top to bottom in the table:

American standard,

European standard,

Japanese standard,

national standard,

Baosteel enterprise standard
Have you noticed a difference:

only ASTM653/653M has the imperial marking method, and Galvanized steel G90 belongs to the imperial marking method. (Of course, ASTM653/653M also has metric representation.
Galvanized G90 uses imperial units, so it must be converted to metric units for comparison.
Galvanized G90 in the standard means: the average minimum weight of the galvanized sheet measured at three points on both sides is 0.9, and the unit is oz/ft² (ounces/square foot), that is, the total zinc layer on both sides is 0.9oz/ft².
1oz=0.0284kg0.9oz=0.02556kg=25.56g1ft²=0.093m²25.56g/0.093m²=275g/m²
American standard galvanized layer code G90=total of both sides 0.9oz/ft²=total of both sides 275g/m² ≠ Baosteel enterprise standard 90/90 g/m² (90+90=180g/m² for both sides).
Let's continue to talk about the relationship between zinc layer weight and zinc layer thickness
The weight and thickness conversion relationship of each coating is different, which is described in the standard. Pure zinc coating 50g/m²≈7.1um;
In summary

for G90, the total thickness of the double-sided zinc layer = 275/50*7.1=39.05um (micrometer).

Having said so much, can you understand the method of expressing the coating weight of galvanized sheet and the meaning of the imperial coating weight? Steel is a standardized product, and familiarity with standards is the basis of trade and use.
Finally, if you have any questions related to steel technology, you can consult our Li Cheung Company

galvanized steel g90 Specification

Product Name	galvanized steel g90
Steel Grade	Dx51D, Dx52D, Dx53D, DX54D, S220GD, S250GD, S280GD, S350GD, S350GD, S550GD; SGCC, SGHC, SGCH, SGH340, SGH400, SGH440, SGH490,SGH540, SGCD1, SGCD2, SGCD3, SGC340, SGC340 , SGC490, SGC570; SQ CR22 (230), SQ CR22 (255), SQ CR40 (275), SQ CR50 (340), SQ CR80(550), CQ, FS, DDS, EDDS, SQ CR33 (230), SQ CR37 (255), SQCR40 (275), SQ CR50 (340), SQ CR80 (550); or Customer's Requirement
Type	Coil/Sheet/Plate/Strip
Thickness	0.1-3.00mm, or customer's requirement
Width	600mm-1500mm, according to the customer's requirement
Type of Coating	Hot Dipped Galvanized Steel(HDGI)
Zinc Coating	30-275g/m2
Surface Treatment	Passivation(C), Oiling(O), Lacquer sealing(L), Phosphating(P), Untreated(U)
Surface Structure	Normal spangle coating(NS), minimized spangle coating(MS), spangle-free(FS)
Quality	Approved by SGS, ISO
ID	508mm/610mm
Coil Weight	3-20 metric tons per coil
Package	Waterproof paper is inner packing, galvanized steel or coated steel sheet is outer packing, side guard plate, then wrapped by seven steel belts.or according to the customer's requirement
Export market	Europe, Africa, Central Asia, Southeast Asia, Middle East, South America, North America, etc

galvanized steel g90 advantages

01. Anticorrosive:

20 years in heavy industrial areas,50 years in the ocean,104 years in the suburbs and 30 years in cities.

02. Cheap:

The cost of Galvanized GI 90 is lower than that of other coatings.

03. Reliable:

The zinc coating is metallurgically bonded to the steel and forms part of the steel surface,so the coating is more durable.

04. Strong toughness:

The galvanized steel g90 layer forms a special metallurgical structure that can withstand mechanical damage during transportation and use.

05. Comprehensive protection:

Every part of the plated piece can be galvanized and is fully protected even in depressions,sharp corners,and hidden places.

06. Save time and energy:

The galvanizing process is faster than other coating methods.

galvanized steel g90 application

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