Professional Custom Dx54D Z275 Z120 Z80 Galvanzied Steel Car Seat Flat Scroll Power Metal Spring Custom Auto Coil in Chrome or Nickel Surface Treatment

• Standard: ASTM, JIS, GB, AISI, DIN, BS
• Certification: ISO, RoHS, IBR
• Surface Treatment: Polished
• Model NO.: automotive steel coils
• Technique: Hot Rolled
• Application: Ship Plate
• Edge: Mill
• Stock: Stock
• Applications: Architectural Decoration
• Product Name: Galvanized Automotive Coils
• Surface Finish: Normal Spangle Coating(Ns), Minimized Spangle Coat
• Type of Coating: Zinc
• Zinc Coating: 30-275G/M2
• Steel Grade: Dx51d, Dx52D, Dx53D, Dx54D and etc.
• Transport Package: Water Proof Paper+Metal Pallet+Angle Bar Protectio
• Specification: As Requirement
• Trademark: TISCO, POSCO, JISCO, LISCO etc.
• Origin: Wuxi China
• HS Code: 721922
• Production Capacity: 50000ton/Month

Product Description

Professional Custom Galvanzied Steel Car Seat Flat Scroll Power Metal Spring Custom Auto Coil in Chrome or Nickel Surface Treatment

Product Description

Galvanized steel coil is a cold-rolled or hot-rolled steel strip coated with a layer of zinc (or zinc alloy) to provide excellent corrosion resistance.
Types
Hot Dip Galvanized (HDG) Steel CoilSteel is dipped into molten zinc at around 460°C, creating a metallurgical bond.
Zinc coating: Z50-Z275 (g/m²)
Surface: regular spangle, minimized spangle, zero spangle
Used for outdoor construction, roofing, cladding, automotive parts, general fabrication.

Electro Galvanized (EG) Steel CoilZinc is deposited electrolytically, with a thinner, smoother coating.
Used for home appliances, interior automotive parts, precision components.
Galvalume / 55% Al Zn Coated SteelCombines aluminum and zinc for better heat resistance and corrosion performance.
Used for high end roofing, solar brackets.
Key Specifications
Standards: ASTM A653, JIS G3302, EN 10142, GB/T 2518
Thickness: typically 0.16-3.0 mm
Width: commonly 1000 mm, 1250 mm
Surface treatments: passivation, oiled, nonoiled, anti fingerprint
Main Applications
Construction: corrugated sheets, profiles, purlins, ducts
Home appliances: refrigerators, air conditioners, washing machine cabinets
Automotive: body parts, chassis, panels
Infrastructure: power towers, agricultural equipment, containers
Galvanized Steel Coil: Chemical Composition
Galvanized steel coil consists of two main parts: a low carbon steel substrate and a zincbased protective coating. Below are the typical chemical compositions for common grades and standards.
1. Substrate (Base Steel) Composition
The substrate is almost always low carbon cold rolled steel (mild steel). Typical ranges (mass %) for standard forming grades (DX51D, SGCC, CS Type B):

Element	Typical Range (%)	Purpose
C (Carbon)	≤ 0.12 (usually 0.02-0.10)	Controls strength and formability; low C for good bending/stamping
Mn (Manganese)	0.20-0.60	Solid solution strengthening; improves toughness
Si (Silicon)	≤ 0.03-0.05	Deoxidation; affects coating adhesion
P (Phosphorus)	≤ 0.03-0.04	Strengthens but increases brittleness; tightly controlled
S (Sulfur)	≤ 0.025-0.03	Forms inclusions; reduces ductility; minimized
Al (Aluminum)	0.02-0.05	Deoxidizer; grain refinement
Fe (Iron)	Balance	Base metal

Common Grade Examples (max %, per standard)
DX51D+Z (EN 10142 / GB/T 2518):C ≤ 0.12, Mn ≤ 0.60, P ≤ 0.04, S ≤ 0.03, Al ≥ 0.02
SGCC (JIS G3302):C ≤ 0.12, Mn ≤ 0.60, P ≤ 0.04, S ≤ 0.03
CS Type B (ASTM A653):C ≤ 0.20, Mn ≤ 0.60, P ≤ 0.035, S ≤ 0.035
2. Coating Composition
A. Hot Dip Galvanized (HDG / GI) Coating
Pure zinc layer (outer): ≥ 99% Zn.
Zn Fe alloy layer (inner, metallurgical bond):
Zn: ~85-92%
Fe: 8-15% (formed during hot dipping)
Coating weight designation: Z60, Z80, Z100, Z120, Z180, Z275 (g/m², total both sides).
B. Electro Galvanized (EG) Coating
Nearpure Zn: ≥ 99.9% Zn
Very thin: typically < 30 g/m² (no significant ZnFe alloy layer).
C. Alloy Coatings (Common Variants)
Galvannealed (GA, ZnFe alloyed): Fe content 9-15% (full alloying).
Galvalume (55% Al Zn): 55% Al, 43.4% Zn, 1.6% Si (by mass).
Zn5% Al mixed rare earth: ~5% Al, small RE, balance Zn.
3. Typical Total Composition (by mass)
For a standard DX51D+Z / Z120 coil (1.0 mm thick):
Steel substrate: ~98.5%
Zinc coating: ~1.5% (120 g/m² total)
Trace elements: < 0.1% (P, S, Si, Al, etc.)
Here's a clear, concise, English-only chemical composition table for the most widely used galvanized steel coil grades (EN 10142, JIS G3302, ASTM A653), for direct use in specs/quotes.
Galvanized Steel Coil - Chemical Composition Limits (by mass %)
Substrate (Base Steel)

Standard	Grade	C ≤	Mn ≤	P ≤	S ≤	Al ≥
EN 10142	DX51D+Z	0.12	0.60	0.040	0.030	0.020
JIS G3302	SGCC	0.12	0.60	0.040	0.030	-
ASTM A653	CS Type B	0.20	0.60	0.035	0.035	-

Notes:
Si is generally ≤ 0.03-0.05% for good coating adhesion.
Balance is Fe (Iron).
Coating Compositions
1. HotDip Galvanized Coating (GI / HDG)
Pure Zn layer: ≥ 99.0% Zn
ZnFe alloy layer: Zn 85-92%, Fe 8-15%
2. Galvannealed (GA)
ZnFe alloy: Zn 85-91%, Fe 9-15%
3. Galvalume (55% AlZn)
Al 55.0%, Zn 43.4%, Si 1.6%

Detailed Photos

For galvanized coils, the sheet steel is immersed in a molten zinc bath to make a sheet of zinc coated on its surface. It is mainly produced by continuous galvanizing process, that is, the rolled steel plate is continuously immersed in a plating tank with zinc melted to make galvanized steel plate; alloyed galvanized steel plate. This kind of steel plate is also manufactured by hot dip method, but immediately after being out of the tank, it is heated to about 500 ºC to form an alloy coating of zinc and iron. This galvanized coil has good paint adhesion and weldability.

Packaging & Shipping

Company Profile

Our company offers variety of products which can meet your multifarious demands. We adhere to the management principles of "quality first, customer first and credit-based", since the establishment of the company and always to do our best to satisfy potential needs of our customers. Our company is sincerely to willing to cooperate with enterprises from all over the world in order to realize a win-win situation since the trend of economic globalization has developed with irresistible force.

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Certifications

FAQ

Q1: Why choose us?
A: Our company, as an internationally experienced and professional supplier, has been engaged in steel business for more than ten years. We can provide a variety of steel products with high quality to our clients.

Q2: Can you provide OEM/ODM service? 
A: Yes. Please feel free to contact us for more details.

Q3:What is your terms of payment?
A: 100% T/T advance.
30% T/T and balance against copy of documents.
30% T/T advance, balance L/C at sight.

Q4: Can we visit your factory? 
A: Warmly welcome. Once we have your schedule, we will arrange the professional sales team to follow up your case.

Q5: Can you provide sample? 
A: Yes. Sample is free for regular sizes, but the buyer needs to pay freight cost.

Q6: How long is your delivery time?
A: Regular lead time is 15 to 30 days after receiving deposit.