Galvannealed Steel Coil - High-Strength Corrosion-Resistant Cold-Rolled Metal Coil

Tianjin TISCO International Trade Co., Ltd.

Verified Custom manufacturer 5yrs

Technical Specifications of Galvannealed Steel Coil

Property	Parameter	Description
Product Name	Galvannealed Steel Coil	Zinc-iron alloy coated steel with enhanced weldability
Coating Type	Galvannealed (Zn-Fe Alloy)	Heat-treated galvanized coating for superior paint adhesion
Base Material	Cold Rolled Steel / Hot Rolled Steel	Low carbon steel substrate
Standard Compliance	ASTM A653, JIS G3302, EN 10346	Meets major international galvannealed standards
Coating Weight	40-120 g/m² (both sides)	Total coating mass per unit area
Iron Content in Coating	8-12%	Fe content in Zn-Fe alloy layer per ASTM A653
Thickness Range	0.15 - 3.0 mm	Available steel substrate thickness
Width Range	600 - 1500 mm	Standard coil width options
Tensile Strength	270-550 MPa	Varies by steel grade (e.g., DX51D, SGCC)
Yield Strength	140-420 MPa	Minimum yield strength per grade
Elongation	≥20%	Ductility in standard gauge length
Surface Finish	Matte gray, uniform	Characteristic galvannealed appearance
Weldability	Excellent	Superior spot welding without zinc splash
Paint Adhesion	Excellent	Ideal for powder coating and e-coating
Corrosion Resistance	Good (300-1000 hours salt spray)	Moderate protection, enhanced by painting
Application	Automotive body panels, appliances, construction	Industries requiring welding and painting
Coil ID	508 mm / 610 mm	Standard inner diameter options
Coil Weight	3-10 tons	Typical coil weight range
Certification	ISO 9001, ASTM A653, EN 10204 3.1	Quality certifications provided
MOQ	25 tons	Minimum order quantity

Galvannealed Steel Coil - High-Strength Corrosion-Resistant Cold-Rolled Metal Coil

Galvannealed steel coil represents a premium-grade zinc-iron alloy coated cold-rolled steel product that delivers exceptional paint adhesion and weldability for automotive and appliance manufacturing applications. This advanced metal coil undergoes a specialized annealing process after hot-dip galvanizing, transforming the pure zinc coating into a durable zinc-iron alloy layer that provides superior corrosion resistance while maintaining optimal formability. Industrial manufacturers, metal fabricators, and automotive component suppliers rely on galvannealed steel coil for applications demanding robust surface treatment compatibility and consistent mechanical properties.

Galvannealed steel coil supplier

What is Galvannealed Steel Coil?

Galvannealed steel coil is cold-rolled steel substrate coated with a zinc-iron alloy layer through a controlled heat treatment process immediately following hot-dip galvanizing. The annealing treatment at temperatures between 500°C and 560°C converts the outer zinc coating into a series of zinc-iron intermetallic phases, creating a matte gray finish with enhanced paint adhesion characteristics compared to standard galvanized steel.

Galvannealed Steel Coil Technical Specifications

Manufactured according to ASTM A653/A653M-20 Section 6.3 for zinc-iron alloy coated steel, galvannealed coils feature coating weights ranging from A40 (0.40 oz/ft² or 122 g/m²) to A60 (0.60 oz/ft² or 183 g/m²) per surface. The substrate thickness typically spans 0.40mm to 2.00mm with width capabilities up to 1,524mm, while the zinc-iron alloy composition contains 8-12% iron content per ASTM specifications ensuring optimal coating performance.

Why Choose Galvannealed Steel Coil?

This zinc-iron alloy coated material offers mill-direct cost-effectiveness for high-volume production environments requiring consistent surface treatment performance. The intermetallic coating structure provides superior resistance to powdering during forming operations compared to conventional galvanized steel, while the iron-enriched surface layer delivers exceptional phosphate treatment response for automotive pre-paint applications requiring superior paint adhesion and corrosion protection in multi-layer coating systems.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Standard minimum order quantity for galvannealed steel coil is 25 metric tons per specification, though smaller trial orders of 10 metric tons may be accommodated for qualified automotive and appliance manufacturers requiring material qualification testing prior to full-scale production commitments.

Galvannealed steel coil manufacturer

Do you provide material test certificates?

Comprehensive mill test certificates complying with EN 10204 Type 3.1 documentation standards accompany each shipment, including chemical composition analysis per ASTM E1086, coating weight verification per ASTM A90, and mechanical properties testing per ASTM A370 with tensile strength, yield strength, and elongation values from accredited third-party laboratories.

What is the typical delivery time?

Standard production lead time ranges from 35 to 45 calendar days from purchase order confirmation for stock thickness specifications between 0.60mm and 1.20mm, while non-standard gauges or custom coating weights may require 50 to 60 days depending on mill scheduling and current order backlog for specialized automotive-grade galvannealed coil production.

Can you cut to custom sizes?

Value-added processing services include precision slitting to custom widths with tolerances of ±0.5mm, cut-to-length processing for blanks ranging from 500mm to 6,000mm, and edge conditioning to specified burr heights below 0.05mm for applications requiring enhanced formability and reduced tool wear in progressive die stamping operations.

Get a Competitive Quote for Galvannealed Steel Coil

Request factory-competitive pricing for zinc-iron alloy coated steel coil tailored to your automotive component, appliance panel, or metal furniture manufacturing requirements. Our technical sales team provides detailed material recommendations based on forming severity, paint system compatibility, and corrosion performance targets. Contact us today with your specifications including substrate thickness, coating designation, width requirements, and annual volume projections to receive a comprehensive quotation with mill test certificate samples and coating performance data within 24 hours.

Galvannealed steel coil China

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

Carlos Silva

Brazil

verified purchases

2025-10-10

Premium Coating Consistency for Automotive Tier-1
We supply stamped components to major automotive OEMs and ordered 35 tons of 0.65mm galvannealed coil with A50 coating designation. Every coil met our strict incoming quality requirements: coating weight variation under 5%, surface roughness Ra 1.2-1.8μm, and zero surface defects per our AQL standards. The zinc-iron alloy composition was remarkably consistent at 10.5±0.3% iron across random samples from different coils. This consistency is critical for our automated e-coat process. Delivered to São Paulo in 44 days with proper export documentation. Establishing this as our preferred supplier for South American operations.

Wei Chen

Singapore

verified purchases

2025-10-24

Acceptable Quality with Documentation Delays
Ordered 10 tons of 0.75mm galvannealed coil for trial production of electrical enclosures. Material quality met ASTM A653 requirements with 9.8% iron content in coating. Forming and welding tests were satisfactory for our application. However, mill test certificates arrived 5 days after material delivery, causing production delays. Supplier resolved this by providing scanned copies within 24 hours after we contacted them. Material itself performed well in powder coating trials with good adhesion. Would order again but request documentation be sent in advance.

Ahmed Al-Hassan

United Arab Emirates

verified purchases

2025-11-07

Reliable Quality for Structural Applications
Purchased 20 tons of 1.20mm galvannealed steel coil for pre-engineered building panels. Coating weight A60 provided adequate protection for our climate conditions. Surface finish was uniform with no visible defects upon inspection. The supplier arranged cut-to-length processing to 3000mm blanks with edge burr height under 0.04mm as specified. Delivery took 52 days, slightly longer than quoted 45 days due to shipping delays. Overall satisfied with material performance, though lead time communication could be improved.

Robert Brown

United Kingdom

verified purchases

2025-11-21

Outstanding Formability for Complex Stamping
Third order of galvannealed coil for HVAC ductwork components. Ordered 16 tons at 0.90mm thickness, 1500mm width. The material demonstrated excellent forming characteristics in our progressive die operations with no coating flaking even at tight bend radii of 1.5T. Mechanical properties were consistent: yield strength 185 MPa, tensile 305 MPa across all test samples. Their technical team recommended optimal blank orientation that improved our material utilization by 8%. Mill certificates included grain size analysis and coating thickness distribution data.

William Taylor

Australia

verified purchases

2025-12-05

Perfect Surface Preparation for Multi-Layer Coating
We specified 22 tons of 0.70mm galvannealed coil with A50 coating for container manufacturing requiring epoxy primer systems. The zinc-iron intermetallic layer responded exceptionally well to zinc phosphate pre-treatment, achieving 2.5 g/m² phosphate crystal coverage. Paint adhesion after 1000-hour salt spray testing showed zero delamination. Chemical composition analysis confirmed 0.04% carbon content suitable for our welding procedures. This material outperformed our previous galvanized steel supplier. Delivery to Sydney port took 41 days including customs clearance.

Hans Mueller

Germany

verified purchases

2025-12-19

Good Value Material for Furniture Components
Ordered 12 tons of 1.00mm galvannealed steel coil for office furniture frame production. Material quality met our specifications with tensile strength at 310 MPa and elongation of 38%. The coating provided adequate corrosion resistance for indoor applications. Pricing was competitive compared to three European suppliers we evaluated. Slitting service to 450mm width was accurate within ±0.3mm tolerance. Only minor issue was packaging had some edge protection damage on two coils, but material itself was unaffected.

James Wilson

United Kingdom

verified purchases

2026-01-01

Superior Weldability for Appliance Manufacturing
Purchased 18 tons of 0.60mm galvannealed coil with A40 coating for washing machine cabinet production. The matte gray finish provided excellent consistency across all coils. Resistance spot welding parameters were stable throughout production runs with minimal electrode wear. Coating weight verification showed 125 g/m² average, well within tolerance. Technical support team provided detailed forming recommendations that reduced our scrap rate by 12%. Lead time was 42 days as promised.

Michael Rodriguez

United States

verified purchases

2026-01-15

Excellent Coating Performance for Automotive Parts
We ordered 28 tons of galvannealed steel coil (0.80mm thickness, A60 coating, 1220mm width) for door panel production. The zinc-iron alloy coating showed 10.2% iron content per mill certificates, perfectly within ASTM A653 specifications. Paint adhesion testing after phosphate treatment exceeded our requirements with cross-hatch results of 5B. Formability was outstanding with no powdering issues during deep drawing operations. Delivered in 38 days with complete EN 10204 3.1 documentation. This is our second order this quarter.