HOT DIPPED GALVANIZED STEEL

Hot-dipped galvanized steel coil is a type of steel product that has been coated with a layer of zinc to protect it from corrosion. The process involves immersing the steel coil into a bath of molten zinc, which forms a metallurgical bond between the zinc and the steel.

This coating provides a durable and long-lasting barrier against rust and other forms of corrosion, making it ideal for use in various applications such as construction, and manufacturing industries.

Product details

Steel Grade	SGCC,DX51D+Z,DX52D+Z,DX53D+Z,S220GD+Z,S350GD+Z,S550GD+Z,etc.
Thickness	0.1-6mm.
Width	1000mm,1200mm,1250mm,1500mm,or customized as your request.
Coil Weight	4-6Tons/Roll,or customized as your request.
Zinc Coating	Z20-Z600GSM.
Spangle	Regular Spangle, Big Spangle, Zero Spangle.
Passivation treatment	Chromium-free fingerprint-resistant passivation, trivalent chromium passivation, hexavalent chromium passivation.

Strip Specification

Thickness(mm)	Regular spangle: 0.3-5.0Zero spangle: 0.6-1.8
Width(mm)	32-860
Coating Weight(g/square meter)	50-275
Inner diameter(mm)	508/610
Surface structure	Regular spangle, Zero spangle
Surface treatment	Environmental chromated, Regular chromated

Surface Finish

Regular Spangle: This is the most common finish, characterized by a visible crystalline pattern on the surface. It is created during the cooling process when the zinc coating solidifies. Minimized Spangle: This finish has a smaller and less visible crystalline pattern compared to regular spangle. It is often used for applications requiring a more uniform appearance.

Application and Recommend Specification

Roofings

Zinc coating: 275 gsm(min), Thickness: 0.40 mm(min), Grade: en 10346 DX51D

Purlins

Zinc coating: 275 gsm(min), Thickness: 1.50 mm(min), Grade: EN 10346 S550GD

Ducts

Zinc coating: 180 gsm(min), Thickness: 0.60 mm(min), Grade: EN 10346 dx51d

Cable Trays

Zinc coating: 275 gsm(min), Thickness: 1.00 mm(min), Grade: EN 10346 dx51d

Available Steel Grade

Our galvanized steel coils are manufactured strictly in accordance with ASTM A653, EN 10346, and AS 1397 standards. Below are the available steel grades and mechanical properties.

Mechanical Requirements for Commercial steel (CS Types A, B, and C)

Designation	Yield Strength
	ksi	[MPa]
CS Type A	25/55	[170/380]
CS Type B	30/55	[205/380]
CS Type C	25/60	[170/410]

Mechanical Requirements for Structural Steel(SS)

Designation	Grade	Yield Strength, min,ksi	Tensile Strength, min,ksi
SS	33	33	45
	37	37	52
	40	40	55
	50 Class 1	50	65
	50 Class 2	50	…
	50 Class 3	50	70
	50 Class 4	50	60
	55	55	70
	60	60	70
	70	70	80
	80	80	82

Mechanical properties of low carbon steels for cold forming

Designation			Yield strength (MPa)	Tensile strength (MPa)	Elongation % min.
Steel grade		Symbols for the types of available coatings
Steel name	Steel number	Symbols for the types of available coatings
DX51D	1.0917	+Z,+ZF,+ZA,+ZM,+AZ,+AS,	–	270 to 500	22
DX52D	1.0918	+Z,+ZF,+ZA,+ZM+AZ,+AS	140 to 300°	270 to 420	26

Mechanical properties of steels for construction

Designation			Mechanical properties
Steel grade		Symbols for the types of available coatings	Proof strength (MPa) min.	Tensile strength (MPa) min.	Elongation % min.
Steel name	Steel number	Symbols for the types of available coatings	Proof strength (MPa) min.	Tensile strength (MPa) min.	Elongation % min.
S220GD	1.0241	+Z,+ZF,+ZA,+ZM,+AZ	220	300	20
S250GD	1.0242	+Z,+ZF,+ZA,+ZM,+AZ,+AS	250	330	19
S280GD	1.0244	+Z,+ZF,+ZA,+ZM,+AZ,+AS	280	360	18
S320GD	1.0250	+Z,+ZF,+ZA,+ZM,+AZ,+AS	320	390	17
S350GD	1.0529	+Z,+ZF,+ZA,+ZM,+AZ,+AS	350	420	16
S390GD	1.0238	+Z,+ZF,+ZA,+ZM,+AZ	390	460	16
S420GD	1.0239	+Z,+ZF,+ZA,+ZM,+AZ	420	480	15
S450GD	1.0233	+Z,+ZF,+ZA,+ZM,+AZ	450	510	14
S550GD	1.0531	+Z,+ZF,+ZA,+ZM,+AZ	550	560	–

Formability grade

Steel grade designation	Transverse tensile test		Transverse bend test	Thickness range for lockseam(mm)
	Min.elongation,%		Degree of bend
	on 50 mm	on 80 mm	Degree of bend
G1	–	–	180°	–
G2	30	27	180°	≤1.60
G3	35	32	180°	All

Structural grade

Steel grade designation	Longitudinal tensiletest				Transverse bend test
	Min.yield strength (MPa)	Min.tensile strength (MPa)	Min. elongation,%		Angle of bend degrees	Diameter of mandrel in terms of test piece thickness(t)
	Min.yield strength (MPa)	Min.tensile strength (MPa)	Lo=50mm	Lo=80mm	Angle of bend degrees	Diameter of mandrel in terms of test piece thickness(t)
G250	250	320	25	22	180	0
G300	300	340	20	18	180	t
G350	350	420	15	14	180	2t
G450	450	480	10	9	90	4t
G500	500	520	8	7	90	6t
G550	550	550	2	2	–	–

Common questions and quick solutions

How could we get the quotation?

You need to provide detailed requirements, such as product category, specifications and quantities, or directly leave a message on the website, we will contact you within 24 hours

Can we visit your factory?

Of course. We are looking forward to customers’ visit to our office and factory. Once you have any schedule for China, please let us know and we will pick you up at the airport or station. By the way, we offer pictures, videos, videoconferencing, live broadcasts, etc. to help you know us better. Please contact us for more information.

What is the annual output capacity?

About 900,000 tons.

Do you have the products in stock?

We have some products in stock, common size or design. Also, we can produce for your order.

Are you Factory or Trading Company?

We are a factory, the main production and sales of steel coil, galvanized coil, color coated coil and so on

What colors are available?

Solid colors, or patterns. Matte or glossy surface. Embossed or perforated. As per solid color, please refer to the RAL color code or send us samples. The most popular colors include traffic red (RAL 3020), sky blue (RAL 5015), moss green (RAL 6005), signal white (RAL 9003), traffic black (RAL 9017), etc. Qiaosi Steel offers more than 400+ custom patterns to choose from, such as grass, brick pattern, wood grain, camouflage, traffic sign, flowers, and so on.

What quote do you offer?

FOB, CIF, CFR, and others can be provided according to your needs.

What are your payment terms?

30% T/T + 70% balance before shipment.

Steel Coils