China Customized Galvanized Steel Manufacturers Suppliers Factory - Wholesale Service

HDGI and Galvanized Steel Coils, Sheets, and Structural Profiles for PEB and Construction

HDGI coils, sheets, and pre-formed profiles manufactured in accordance with ASTM A653 and EN 10346 standards. Tailored for pre-engineered building (PEB) framing, C/Z purlins, roof cladding, and HVAC ductwork, our galvanized steel products provide consistent yield strength, precise thickness tolerances, and zero/regular spangle surface options designed for high-speed roll forming and deep stamping.

Hot Dipped Galvanised Steel
Name: Hot Dipped Galvanised Steel. Product Form: Zinc coated steel available in coils, flat sheets, plates, and cut to size formats for construction, manufacturing, engineering, and industrial

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Round Galvanized Pipe
Name: Round Galvanized Pipe. Product Form: Circular hollow steel tubing designed for structural fabrication, utility piping, outdoor installations, and protective framework production. Steel

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Galvanized Grating Near Me
Name: Galvanized Grating Near Me. Material: S350GD steel with galvanized or Zn-Al-Mg coating options. Structure: Open-grid design for effective drainage, ventilation, and easy maintenance access.

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Galvanised Square Mesh
Name: Galvanised Square Mesh. Material: Welded steel wire grid with a zinc coated finish, providing a firm square structure, reliable surface protection, and suitability for exposed working

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Galvanised Reinforcing Mesh
Name: Galvanised Reinforcing Mesh. Material: Welded steel wire mesh with a zinc-protected surface, engineered for stable grid structure and improved resistance to moisture and outdoor exposure. Wire

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Galvanised Steel Sheet
Name: Galvanised Steel Sheet. Material: Premium steel substrate finished with a protective zinc layer for enhanced durability and resistance to atmospheric corrosion. Thickness: 0.20–3.00mm, suitable

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Armour Galvanizing
Name: Galvanized Metal Strips. Material: High-quality galvanized steel with excellent corrosion resistance. Thickness: 0.15–5.0mm for various industrial applications. Width: 20–1250mm with custom

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Galvanized Metal Strips
Name: Galvanized Metal Strips. Material: High-quality galvanized steel with excellent corrosion resistance. Thickness: 0.15–5.0mm for various industrial applications. Width: 20–1250mm with custom

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Flux Core Welding Galvanized Steel
Name: Flux Core Welding Galvanized Steel Coil. Thickness Range: 0.15–5.5mm for structural and fabrication use. Zinc Coating: Z40–Z220 g/m² for balanced corrosion resistance and weldability. Coil

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Galvanised Metal Mesh
Name: Galvanised Metal MeshMaterial Specification: Low Carbon Steel Wire / Galvanized Steel WireMesh Aperture Range: 5mm × 5mm – 100mm × 100mmWire Diameter Options: 0.5mm – 6.0mm depending on mesh

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Cost To Galvanize Steel
Name: Cost To Galvanize SteelApplicable Standards: ASTM A123 / ISO 1461 / EN 1460Service Thickness Range: 1.0mm – 25.0mm (steel section dependent)Processing Length: 0.5m – 12m or cut-to-requestLead

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Galvanised Sheet Metal Prices
Name: Galvanised Sheet Metal prices. Thickness: 0.3-3.0mm. Width: 600-1500mm. Zinc Coating: 40-275g/m². MOQ: 5mt. Delivery Time: 7-30 days.

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Product Categories

Hot-Dip Galvanized Coils (HDGI):

Raw coils for continuous roll-forming lines, stamping presses, and slitting operations.

Cut-to-Length Galvanized Sheets:

Flat sheets packaged on heavy-duty skids, trimmed to exact length tolerances for panel stamping and HVAC manufacturing.

Galvanized Steel Strips:

Narrow-slitting coils for cable trays, steel strapping, and specialized cold-formed sections.

Cold-Formed Structural Profiles (C/Z Purlins and Girts):

Pre-punched and roll-formed structural framing members ready for jobsite assembly.

Technical Specifications

Parameter	Capability / Standard Range	ASTM Benchmark	EN Benchmark
Thickness Range	0.12 mm - 4.0 mm (+/-0.02 mm tolerance)	ASTM A653	EN 10346
Width Range	600 mm - 1500 mm (Slitting down to 30 mm)	ASTM A924	EN 10143
Zinc Coating Mass	Z30 - Z600 (30 g/sqm - 600 g/sqm total both sides)	G30 - G210	Z100 - Z600
Coil Inner Diameter (ID)	508 mm (20 in) / 610 mm (24 in)	Standard Industry ID	Standard Industry ID
Coil Weight	3.0 MT - 10.0 MT per coil (customizable)	Customer spec	Customer spec
Surface Treatment	Chromated (Passivated), Oiled, Anti-Fingerprint (AFP), Dry	ASTM A653 Sec. 11	EN 10346 Sec. 7.9
Surface Finish	Zero Spangle, Minimised Spangle, Regular Spangle	ASTM A653	EN 10346

Steel Grades and Mechanical Properties

Commercial and Formable Grades
• ASTM A653: CS Type A, CS Type B, CS Type C, FS Type A/B (Drawing applications)
• EN 10346: DX51D+Z (Standard lock-forming), DX52D+Z, DX53D+Z (Deep drawing)

Structural Grades for PEB and Load-Bearing Applications
• ASTM A653 SS: Grade 33 (230 MPa), Grade 40 (275 MPa), Grade 50 Class 1/2 (340 MPa), Grade 80 (550 MPa)

• EN 10346: S220GD+Z, S250GD+Z, S280GD+Z, S350GD+Z, S550GD+Z (High-yield purlins and structural decks)

Manufacturing & Processing Capabilities

Large-Scale CNC Cutting:

Gantry fiber laser (up to 20 kW) and underwater CNC plasma cutting tables handling plates up to 4.0 meters wide and 18 meters long.

Heavy-Duty CNC Press Braking:

1600-Ton press brake capable of cold-forming high-strength steel up to 25 mm thickness in single-pass lengths up to 12 meters.

Robot & Submerged Arc Welding:

Automated robotic MIG welding stations and heavy submerged arc welding (SAW) units for deep-penetration structural seams.

Post-Weld Machining & Boring:

Floor-type CNC horizontal boring mills achieving bore concentricity within 0.03 mm on large structural fabrications.

Manufacturing and Processing Capabilities

Production lines are equipped with continuous hot-dip galvanizing technology, tension levellers, and automated inline slitting equipment.

Continuous Hot-Dip Line:

Air-knife wiping systems ensure uniform zinc coating distribution across the entire width within +/-5 g/sqm.

Tension Levelling and Skin Pass:

Eliminates fluting, improves strip flatness to le 3 mm/m, and minimizes yield point elongation for smooth surface appearance.

Precision Slitting and Precision Shearing:

High-speed slitting lines accommodate widths down to 30 mm with edge burr controlled under 5% of material thickness.

Custom Punching and Pre-forming:

Pre-punched web and flange holes on C/Z purlin lines based on Tekla/CAD drawing inputs.

Quality Control and Compliance Standards

Every production heat is tracked and tested prior to release. Mill Test Certificates (MTC) according to EN 10204 3.1 are provided with every shipment.

Zinc Mass Testing:

Online X-ray gauge thickness verification paired with triple-spot weigh-strip-weigh testing (ASTM A90 / ISO 1460).

Mechanical Testing:

Tensile strength, yield point, and elongation testing per ASTM A370 / EN ISO 6892-1.

Adhesion and Formability:

180 deg Bend test (T-bend le 2T without zinc peeling or flaking) and impact testing.

Corrosion Resistance:

Salt spray chamber testing (ASTM B117) validating passivation performance up to 72 hours without white rust under controlled lab conditions.

Target Applications

Pre-Engineered Buildings (PEB):

C/Z purlins, roof decks, wall girts, and structural framing.

Construction Cladding:

Corrugated roofing sheets, insulated sandwich panel skins, and standing seam roofs.

HVAC and Infrastructure:

Air ducting, cable management trays, acoustic insulation panels, and steel framing channels.

Enclosures and Stampings:

Distribution boards, electrical control cabinets, appliance panels, and automotive unexposed structural reinforcements.

MOQ and Lead Time

Minimum Order Quantity (MOQ):
Standard Grades and Sizes (e.g., S350GD/Z275, 1.0mm/1.2mm x 1200mm): 25 Metric Tons (1x20ft Container).
Special Grades or Custom Zinc Mass (e.g., S550GD or Z600 coating): 50 Metric Tons.

Production Lead Time:
• Standard stock specifications: 7-10 days.
• Custom mill run orders: 20-25 days from deposit or L/C confirmation.

Export Packaging and Moisture Protection

Inner Layer: VCI (Vapor Corrosion Inhibitor) protective film with desiccants placed inside the coil core.

Barrier Layer: Waterproof kraft paper and heavy-duty plastic wrapping.

Outer Shield: Inner and outer metal edge protectors, galvanized steel side guards, and galvanized corrugated outer wrapping.

Securing: Minimum 4 circumferential steel straps and 3 radial steel straps.

Transit Securing: Heavy-duty wooden skids/pallets positioned vertically (eye-to-sky) or horizontally (eye-to-side), fully lashed with steel wire ropes and wood choking blocks inside 20ft heavy-tested containers (max load 27-28 MT per container).

FAQ

Q: How do you prevent white rust during long sea transit across different climate zones?

A: We combine chemical chromate passivation (or trivalent chromium-free treatment) with an oiled surface layer. Coils are sealed in airtight VCI anti-corrosion film with active desiccants, capped with steel inner/outer edge guards, and wrapped in waterproof barrier paper before container loading.

Q: What is the difference between Z275 (G90) and lower zinc coatings for structural PEB applications?

A: Z275 / G90 provides 275 g/sqm total zinc weight on both sides (approximately 20 um per side), which is the standard baseline requirement for unpainted outdoor structural members in standard atmospheric conditions. Lower coatings like Z100 or Z120 are intended for unexposed indoor framing or temporary structures and require secondary painting for exterior exposure.

Q: Can your galvanized coils handle high-speed cold roll forming without zinc peeling?

A: Yes. Skin-passed material processed with controlled air-knife wiping maintains tight intermetallic iron-zinc alloy layers. Our coils pass 0T-2T bend tests without micro-cracking or flaking, making them suitable for high-speed purlin and decking roll formers.

Q: Do you supply Mill Test Certificates (MTC) according to EN 10204 3.1?

A: Every shipment includes an EN 10204 3.1 MTC containing exact heat numbers, chemical composition (C, Mn, P, S, Si), mechanical test results (yield, tensile, elongation), and measured zinc coating mass per side. Third-party inspections by SGS, BV, or Intertek can be conducted upon request prior to loading.

Q: What thickness tolerances can your cold rolling and galvanizing lines maintain?

A: Standard thickness tolerance complies with EN 10143 / ASTM A924 (typically +/-0.03 mm to +/-0.05 mm depending on gauge). Precision tolerance lines can achieve +/-0.015 mm to +/-0.02 mm for demanding automotive and stamping customers.

Q: What coil weight and ID configurations do you support for automatic uncoiler machines?

A: Standard inner diameters are 508 mm (20 in) and 610 mm (24 in). Coil weights can be customized from 3 MT up to 10 MT to match your uncoiler mandrels and crane capacities.

Request a Technical Quote and Material Sample

Send us your required substrate grade, thickness, width, zinc mass, and total tonnage. Our metallurgical engineering team will confirm mill limits and pricing within 12 hours.
Email: info@tjrsr.com
WhatsApp / Direct Line: +86 15900235505
Factory Location: Tianjin Steel Industrial Zone, China
Required Quote Details: Grade (e.g., S350GD+Z) | Dimensions (T x W) | Coating (e.g., Z275) | Quantity (MT) | Destination Port

As one of the most professional galvanized steel manufacturers and suppliers in China, we also support customized service. Please feel free to wholesale cheap galvanized steel in stock here from our factory. For price consultation, contact us.

Painted coil steel, 55 Al Zn coated steel sheet in coils, pre engineered buildings industry