Building Material Gi SGCC Sgc400 Zinc Coating Galvanized Steel Coil

Product Description

Qingdao Witop Steel Co., Ltd

Trusted by 1,000+ Clients Worldwide for Over 20 Years

20+ Years of Industry Experience

With over two decades of expertise in coated steel production and export, we deeply understand global market needs and quality standards.

Trusted by 1,000+ Global Clients

Our steel products have been successfully delivered to more than 1,000 clients in over 30 countries, earning long-term trust and repeat orders.

Full Range of Steel Products

Specializing in Galvanized (GI), Galvalume (GL), Aluzinc, Zincalume, Prepainted (PPGI/PPGL) coils and sheets—widely used in roofing, construction, and industrial applications.

Efficient Export Service

Fast response, professional documentation, and one-on-one support ensure a smooth international trade experience.

Product Description

Galvanized Steel Coil

Hot dipped galvanized steel coil are processed by continuous hot-dip galvanizing from cold-rolled steel coil. Zinc coating on both sides can effectively prevent corrosion and rust, and increase the service life of steel plate.

The main characteristics of hot dipped galvanized steel coil have good processing performance, strong corrosion resistance, high heat resistance, perfect mechanical properties and pretty surface quality, which are beneficial to further processing, economical and practical in infrastructure and construction.

Specification

Standard	JIS G3302, EN10147, ASTM A653M
Grade	Commerical:  SGCC, SGCH, DX51D
	Deep Drawn: DX52D, DX53D, DX54D, FS, DDS, SGCD, SGC
	Froming and Structrual Steel: S280GD, S320GD, S350GD, S400GD, S500GD, S550GD
Zinc Coating	Z30-400G/M2, G30, G60,G90, Z10, Z12,Z27
Spangle Model	Zero Spangle, Small Spangle, Regular Spangle, Big Spangle
Surface Treatment	Chromated, Oiled, No-oiled
Hardness	Softy, Semi Hard, Full Hard, G550
Thickness	0.11-4.00MM
Width	20-1800MM
Coil Weight	Coil Weight
Coil Inner Diameter	508MM or 610MM
Package	Standard Seaworthy Exporting Packing
Transport Type	Vessel Container, Vessel Bulk, Railway Container, Railway Wagon
Loading Port	Tianjin, Qingdao, Ningbo, Shanghai and other China's port
Delivery Time	15-25 Days after Receiving the Deposit
Terms of Trade	EXW, FOB, CFR, CIF
Terms of Payment	T/T and Irrevocable LC at Sight
Production Capacity	7000MT/Month
Application	Roofing, wall cladding, Structural steel, pre-painted panels Car body components, chassis parts Refrigerator back panels & air conditioner shells Steel cabinet, shelf manufacturing Ventilation ducts, chimney pipes, and flue systems Electrical enclosures, distribution boxes Ceiling panels, wall partitions Toolboxes lighting fixtures metal craftwork Greenhouse tubes, scaffold pipes, cable conduits Cable tray supports & grounding accessories C/Z structural purlins Industrial packaging straps, steel bundling strips  Electronic frames and appliance brackets

Product Structure & Process Flow Chart

Galvanized Steel Coil Structure

* Chromated, Oiled/non-Oiled, Anti-Finger Printing
*Zinc Coated/ Aluzinc Coated/Galvalume Coated/ Zincalume Coated Layer
*Steel Sheet (Base Metal)

More Spangle Type for Choose

1. Zero Spangle
2. Small Spangle
3. Regular Spangle
4. Big Spangle

Product Application

Hot Dipped Galvanized Steel Coil Process Flow Chart

1. Pay Off

2. Welder

3. Entry Looper

4. Annealing Furnace

5.Zinc Pot / Aluzinc Pot

6. Spangle and Alloying Equipment

8. Coating Weight Control

9. Air Cooling

10. Coating Weight Measurement

11. Water Cooling

12. Skinpass Mill

13. Tension Leveler

14. Chemical Treatment

15. Delivery Looper

16. Surface Inspection

17. Oiler

18 Tension Reel

QA QC Inpection

Professional Inspect Equipment

Quality Control – Guaranteed for Every Batch

We conduct strict quality control tests on every batch of galvanized steel coils before shipment to ensure superior product performance and customer satisfaction.

Our Key Testing Procedures Include:

Coating Thickness Test:
Ensures consistent corrosion resistance and compliance with standards like ASTM A653, JIS G3302, and EN 10346.

Tensile Strength & Elongation Test:Verifies mechanical strength and flexibility for forming, bending, and stamping applications.

T-Bend & Flexibility Test:
Confirms the coating's adhesion under extreme bending without cracking or peeling.

Surface Finish & Spangle Inspection:
Checks for regular, zero, or minimized spangle and overall surface appearance for aesthetic and performance requirements.

Thickness and Width Precision Measurement:
Guarantees tight tolerances as per order specifications.

Chemical Composition Analysis:
Validates base steel consistency using spectrometer analysis.

Packing & Delivery

Packing Details

Standard export package: 3 layers of packing, inner side is anti-water craft paper, PVC plastic film is the middle and outer side covered by at least 0.45mm thick steel sheet,wrapped by minimum seven steel strapping strips with lock catch.

In particular, WITOP steel places desiccant on the coil inner core side and on both lateral sides of the coil for bulk transportation to ensure that coils are delivered to clients in good condition.

Package can be customized as client's requirements.

Loading and Fastening Steel Coil

WITOP steel have our own loading and fastening workers and team, which can fasten steel coils well in container and bulk based on ship line company. WITOP steel can guarantee galvanized steel coil well to every client.

Application

Factory Live Shot

Customer Visited US

Our Exhibition

Our Partner

Our factory welcomes international customers who personally visited our production line.

With over 20 years of experience, Witop Steel is a trusted Chinese supplier serving 1000+ clients globally.

We offer full factory tours, third-party inspection, and professional export services.
Contact us to schedule a visit and explore long-term cooperation.

Witop Steel regularly participates in international exhibitions such as Canton Fair, BIG 5 Dubai, BuildTech Asia, and other steel & construction trade shows around the world.

Over the years, we've welcomed clients from Asia, the Middle East, Africa, South America, and Europe. Our exhibitions strengthen long-term partnerships and help buyers understand our quality and service firsthand.

At Witop Steel, we believe that high-quality products start with reliable raw materials.

That's why we source our base steel and coatings from leading Chinese steel manufacturers. Including long-term partnerships with certified mills such as Shougang, Baosteel, Rizhao Steel, and other reputable suppliers.

Customer Review

Ceritifcate

Over the years, Witop Steel has served more than 1,000 clients in 30+ countries, earning high praise for our product quality, fast delivery, and professional service.

Our factory is ISO 9001 certified and our products comply with international standards such as ASTM, JIS, EN, ensuring consistent performance, durability, and safety for our global clients.

Buyer's Guide: Common Questions Answered by Witop Steel

Q1: Are you a manufacturer or trading company?
A: We are a professional manufacturer of galvanized steel coils, galvalume coils, and prepainted steel (PPGI/PPGL) with over 20 years of experience. Our factory is located in China and supports both OEM and direct export services.
 
Q2: What is your minimum order quantity (MOQ)?
A: Our standard MOQ is 25 tons (1 container), but we also support small trial orders for new customers.
 
Q3: What standards do your products follow?
A: We produce coils according to ASTM A653, JIS G3302, EN 10346, and other international standards. Certificates like ISO, SGS, BV, CO, and Form E are available upon request.
 
Q4: Can you provide sample coils or cut sheets?
A: Yes, we can provide free A4-sized samples or cut sheets for testing and evaluation. Shipping costs may apply depending on location.
 
Q5: How do you ensure quality control?
A: Each batch undergoes strict quality inspection, including:
Coating and thickness test
Tensile strength and elongation test
T-bend and impact test
Surface and spangle inspection
We also provide mill test certificates (MTC) for every order.
 
Q6: What's your lead time?
A: Normal delivery time is 20–25 days after receiving the deposit. Urgent orders can be prioritized.
 
Q7: Do you support third-party inspection?
A: Yes. We welcome inspections by SGS, BV, TUV, or any agency appointed by the buyer.
 
Q8: Which markets do you serve?
A: Our main markets include Southeast Asia, the Middle East, Africa, South America, and Eastern Europe. We've served over 1,000 global buyers.
 
Q9: Can I visit your factory in China?
A: Absolutely! We welcome you to visit our factory. We'll provide pickup service, arrange a factory tour, and show you the production & inspection process.
 
Q10: What are your payment terms?
A: We accept T/T, L/C, and in some cases, DP or OA for long-term partners.