G550 Hard Material Galvanized Steel Coil Using for Door

• Customization: Available
• Standard: ASTM, JIS, GB, AISI, DIN, BS
• Certification: ISO
• Model NO.: SGCC, SGCH, JIS G3302, DX51D, DX52D, DX53D
• Surface Treatment: Galvanized
• Technique: Cold Rolled
• Application: Gi Roofing Sheet, Structure Steel
• Edge: Slit edge
• Stock: Stock
• Thickness: 0.12~4.0 mm
• Width: 10mm~1500 mm
• Coating: 30 - 275G/M2
• Spangle: Regular, Zero, Small, Big
• Type: Coils , Strip , Sheet
• Weight: 3-8 Tons
• Coils ID: 508mm / 610mm
• Grade: SGCC/CGCC/Tdc51dzm/Tdc52dts350gd
• Hardness: MID Hard
• Tolerance: 1%
• Price Term: CIF CFR Fob Ex-Work
• Certificate: ISO9001
• Oiled or Non-Oiled: Non-Oiled
• Length: Coils
• Using: Making Pipes, Cutting Sheets, Making Small Tools
• Transport Package: by Vessel, Standard Export Packing
• Specification: 0.12~4.0 mm thickness
• Trademark: ZUNKAI
• Origin: Shandong
• HS Code: 7210490000
• Production Capacity: 100000 Tons Per Month

Product Description

Product Description

 

What is Galvanized Steel CoilGalvanized coil, a thin steel sheet that is dipped in a bath of molten zinc to adhere a layer of zinc to its surface. It is mainly produced by continuous galvanizing process, that is, the coiled steel plate is continuously dipped in a plating tank with molten zinc to make galvanized steel plate; alloyed galvanized steel plate. This kind of steel panel is also made by hot dip method, but it is heated to about 500ºC immediately after coming out of the tank, so that it can form an alloy film of zinc and iron. This galvanized coil has good paint adhesion and weldability.

 

Product Parameters

Material chemical composition analysis

Metal type	Grade	CHEMICAL COMPOSITION %
		C	Si	Mn	P
cold rolled steel	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	DD51D+Z (St01ZR, St02ZR)	≤0.10	-	≤0.50	≤0.035
	DD54D+Z (St06ZR)	≤0.01	≤0.10	≤0.30	≤0.025

Zinc Coating
Usually Zinc Coated can be Z30 - Z275G , The weight of the zinc layer should be provided according to customer requirements
 

Galvanized Steel Coil Production Process

Hot-rolled coils become cold-rolled coils after pickling, phosphating, annealing and other processes,Immerse the steel coil in the molten zinc tank to make the surface adhere to the zinc coated.

Type Of Spangle

Usually there are four types of Spangle .
1) Regular and Big spangle During the normal solidification process of the zinc layer, the zinc grains grow freely and form a coating with obvious spangle morphology.

2)Small Spangle During the solidification process of the zinc layer, the zinc grains are artificially restricted to form a spangle coating as small as possible.

3)Zero Spangle

By adjusting the chemical composition of the plating solution, there is no visible spangle morphology and a uniform coating on the surface.
Surface treatment of galvanized coils
1. Passivation C
2. Oil O
3. Lacquer seal L
4. Phosphating P
5. Do not process U
1 passivation
The galvanized layer is passivated to reduce folding corrosion (white rust) under tidal temperature storage and transportation conditions. However, the anti-corrosion performance of this chemical treatment is limited and, moreover, hinders the adhesion of most paints. This kind of treatment is generally not used in the zinc-iron alloy coating. Except for the smooth surface, as a routine, the manufacturer conducts passivation treatment on other types of zinc coating.
2 oiled
Oiling can reduce steel plate corrosion under wet storage and transportation conditions, and re-oiling steel plates and steel strips after passivation treatment will further reduce corrosion under wet storage conditions. The oil layer should be able to be removed with a degreasing agent that does not damage the zinc layer.
3 paint seal
An additional corrosion protection, especially anti-fingerprint properties, can be provided by applying a very thin film of transparent organic coating. Improves lubricity when forming and acts as an adhesion primer for subsequent coats.
4 Phosphating
Through phosphating treatment, galvanized steel sheets of various coating types can be coated without further treatment except for normal cleaning. This treatment can improve the adhesion and anti-corrosion performance of the coating, and reduce the risk of corrosion during storage and transportation. After phosphating, it can be used with a suitable lubricant to improve the forming performance.
not deal with
The steel plates and strips supplied according to this standard may not be passivated or oiled or painted or phosphating and other surface treatments are required only if the orderer puts forward a request not to be treated and is responsible for it.
 

Product Name	Hot Dipped Galvanized Steel Coil,Zinc Coated Steel ,GIHDGI
Standard	EN10346, JIS G3302, ASTM A653,AS 1397,GB/T 2518
Steel Grade	Dx51D, Dx52D, Dx53D, DX54D,DX55D,DX56D,DX57D, S220GD, S250GD, S280GD, S320GD,S350GD, S390GD,S420GD,S450GD,,S550GD, SGHC, SGH340, SGH400, SGH440, SGH490,SGH540, SGCC,SGCH,SGCD1, SGCD2, SGCD3, SGCD4,SGC340, SGC400 , SGC440, SGC490,SGC570; CS-A,CS-B,CS-C,Grade 33,grade 37.grade 40,garde 50,grade60,grade70,grade80 G1,G2,G3,G250,G300,G450,G550 As Requirement
Type	Coil/Sheet/Plate/Strip
Thickness	0.12mm-6.0mm or 0.8mm/1.0mm/1.2mm/1.5mm/2.0mm
Width	600mm-1500mm or 914mm/1000mm/1200mm/1219mm/1220mm
Zinc Coating	Z30g/m2-Z450g/m2
Surface Structure	Normal spangle (N),, spangle-free(FS),Zero Spangel
Surface Structure	Oiled (O),Passivated(C),Passivated and oiled (CO) ,Sealed (S),Phosphate (P),Phoaphte and oiled (CO)
Coil ID	508mm/610mm

Our Advantages

 

Why do galvanized coils cause white rust and black rust?

The causes of white rust and black spots are as follows: black spots are formed by further oxidation of white rust.
The main causes of white rust are:
(1) Poor passivation, insufficient or uneven passivation film thickness;
(2) The surface is not oiled or there is residual moisture on the strip surface;
(3) The surface of the strip steel contains moisture during coiling;
(4) The passivation is not completely dried;
(5) Damp or rain during transportation or storage;
(6) The storage time of finished products is too long;
(7) The galvanized sheet is in contact with or stored together with other corrosive media such as acid and alkali.

The finished product is allowed to be stored in the warehouse for up to three months to avoid oxidation caused by long-term storage. Therefore, in order to ensure the quality of use and prolong the service life of galvanizing, we should avoid the above factors that cause rust.
 

Detailed Photos

 

Packaging & Shipping

 

About Packing And Delivery 
1.Standard Sea Worthy Packing 
3 layers of packaging, kraft paper inside, water plastic film in the middle, the outermost GI steel plate tied with steel belt or as required.
2.Shipping port: Tianjin/Qingdao
3.Shipment:
a. Length: ≤6m, loaded in 20GP Container.
b. Length: ≤12m, loaded in 40GP Container.
Remark: Size of 20GP Container (inside :5898*2352*2393mm)
Size of 40GP Container (inside:12032*2352*2393mm)
Size of 40HQ Container (inside:12032*2352*2698mm)
4.Delivery time: Within 7-15 days, depending on the situation

Galvanized coils can be divided into hot-rolled galvanized coils and cold-rolled hot-dip galvanized coils, which are mainly used in construction, home appliances, automobiles, containers, transportation and household industries. Especially steel structure construction, automobile manufacturing, steel silo manufacturing and other industries.

About quality Control
Usually, after all the products finished production, the factory laboratory will take a certain proportion of the products according to the proportion, and carry out the inspection of zinc layer, thickness, width, etc., and also accept any third-party inspection arranged by the customer , such as QC inspection, SGS inspection and so on.
 

Jinan Zunkai Group founded in 2002, with five branch companies and is wel-funded. Ourannual sales nearly one billion, about 300,000 tons steel. Our company is located in JinarCity, Shandong Province. We entered into a strategic partnership with Bao Steel, LaiwuSteel, Rizhao Steel, Handan Steel, Anyang Steel, Maanshan Steel and other domesticlarge steel companies. Zunkai is the largest steel agent in Shandong Province, we alsohave ourselves steel process factory with 100000 Square meter for steel laser cutting.surface treatment and other further processing , and our stock always more than 20.000tons.Zunkai Group mainly engaged in : PPGl ,galvanized steel , steel plate , round bar.steel pipe ,Stainless steel product ,angle bar, steel pile ,H beam ,l beam, angle, Channelflat steel etc . Our good quality and reliable service will be your best trusted partner.Sincerely wish to building long and regular business with you forever!

Certifications

 

 

FAQ

 

Q: Are you a manufacturer?
A: Yes, we are a manufacturer, we have our own factory. And we are the China leading Galvanized steel coil, Galvalume steel coil,PPGI/PPGL etc. We promise that we are exactly the supplier you have been looking for. We welcome you to visit our factory to check our production lines and know more about our capacity, quality.
Q: Do you have quality control system?
A: Yes, we have ISO, BV, SGS certifications and our own quality control laboratory.
Q: Can you arrange the shipment for us?
A: Yes, we have designated Sea Freight and Railway freight forwarders with decades of experiences and we can get the best price with earliest vessel and professional services.
Q: How long is your delivery time?
A: Generally it is 7-14 days if we have the exact goods in our stock. If not, it will take around 25-35 days to get goods ready for delivery.
Q: How do you keep long-term business and good relationship ?
A: 1.We keep supplying good quality products and competitive prices to ensure our customers' benefit.
2. We think highly of every single customers of us and value the relationship, we take it not only as business partner, but also as true friends. Will keep the good services and put customers' benefit as high priority.