Q235 / Q355 Hot-Dip Galvanized Flat Steel (3–60 mm)
Heavy zinc layer protection designed for outdoor earthing, brackets, and structural framing.
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Primary Product Showcase
Standard & Custom Hot-Dip Galvanised Profiles
Pre-inspected structural lines, slit flat bars, and precision-rolled sections ready for export loading via Tianjin Port.
Hot Rolled Q235B High-Ductility Carbon Flat Bar
Optimum weldability and shear ductility for structural hardware and metal fabrication.
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Black Solid Structural Flat Bar Q235 / Q355
Mill finish heavy bars calibrated for industrial machinery and base mounting plates.
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A36 / Q235 Grade Structural H-Beam Flanges
Wide-flange columns and structural supports for workshop frames and cross girders.
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Perforated Galvanized Carbon Steel Angle Bar
CNC perforated mounting angles with high adhesion zinc coating for bolted joints.
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Hot Rolled Galvanized C/U Channel Sections
Industrial structural channels for cable trays, purlins, and wall framing girders.
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Galvanized High-Load Scaffolding Steel Pipe
Rigid circular ERW pipe with anti-corrosion barrier for greenhouse and construction.
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EN 10346 DX51D–DX54D Galvanized Slit Coil
Continuous zero-spangle zinc coating for roll forming and precision stamping.
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Industrial Operations Overview
China Factory 4.0: Metallurgical Precision & Scalability
Established in 1996 in Daqiuzhuang, Tianjin, HZXY delivers full lifecycle metallurgical integrity across a 1,500-acre production footprint.
1996
Foundation Year • 30-Year Heritage
1,500+
Acres of Integrated Mill Facilities
10M+
Tons Annual Output Capacity
50+
Countries Global Export Network
Intelligent Slitting & Edging
Continuous hot-rolled wide coil slitting coupled with automated deburring and edge-conditioning units produces ASTM A6 and EN 10058 compliant square or round edges without micro-cracking.
Tolerance ±0.15mm
Edge Radiusing
Multi-Bath Flux Pre-Treatment
Automated ultrasonic degreasing, multi-stage hydrochloric acid pickling with corrosion inhibitors, and high-purity zinc ammonium chloride fluxing safeguard pristine metallurgical substrate bonding.
ISO 1461 Surface
No Dross Inclusions
Thermal Molten Immersion
Computerized ceramic kettle hot-dip baths operating precisely at 445°C to 455°C foster sequential Gamma (Γ), Delta (δ), and Zeta (ζ) intermetallic Fe-Zn alloys crowned with pure Eta (η) zinc.
85–120 μm Layer
ASTM A123 / A153
Advanced Metallurgy
Technical Roadmap & Future Outlook of Galvanized Flat Bars
Anticipating future engineering and sustainability standards through low-carbon zinc alloying and AI-driven quality assurance.
Zinc-Aluminum-Magnesium (ZAM) Migration
Progressive transition from conventional pure zinc baths to ternary Zn-Al-Mg molten baths (1-3% Mg, 1-3% Al). The self-healing corrosion mechanism of Simonkolleite films provides 3x to 5x higher resistance in aggressive saline and C5 marine environments, minimizing maintenance costs for coastal PV infrastructure.
CBAM & Carbon Footprint Traceability
Integration of Electric Arc Furnace (EAF) secondary scrap recycling and hydrogen-injected heating furnaces. Full alignment with the EU Carbon Border Adjustment Mechanism (CBAM) guarantees digital product passports (DPP) containing verified cradle-to-gate embedded emissions metrics down to unit kilogram shipments.
Real-Time XRF Coating Control
Continuous inline X-Ray Fluorescence (XRF) coating thickness gauges combined with optical surface defect scanning identify micron-scale thickness variances and coating holidays during slitting and packaging, eliminating rejection risks at the discharge terminal.
Engineered Sector Applications
Macro Industry Solutions: Mission-Critical Deployment
Engineered galvanized flat profiles built to endure extreme cyclic loads, aggressive soils, and offshore environmental stresses.
Utility-Scale Photovoltaics & Sub-Structures
Serving as high-strength torque tube connecting flanges, module purlins, and ground mounting struts. Our flat bars deliver exceptional buckling resistance and bolt-hole dimensional stability under extreme aerodynamic drag and seismic vibrations.
Substation Grounding & Earthing Grids
High-conductivity Q235B flat bars with minimum 85 μm zinc coatings guarantee low soil-contact impedance, absorbing transient short-circuit dissipation and lightning discharge in substation foundations over a 50-year service life without anodic depletion.
Civil Engineering, Gratings & Infrastructure
Pre-punched and cut-to-length flat bars integrated into high-load serrated steel gratings, trench covers, bridge balustrades, and structural tie plates. Full compliance with EN 10025 structural grades eliminates on-site torch cutting and edge re-coating.
Quality & Compliance Matrix
Global Equivalence & Metallurgical Benchmarking
Strict mechanical calibration adhering to GB/T, ASTM, EN, and JIS standards with every MTC EN 10204 3.1 verification.
| Steel Grade (China GB) | US Equivalent (ASTM) | European Norm (EN) | Japanese Std (JIS) | Min. Yield Re (MPa) | Tensile Strength Rm (MPa) | Zinc Layer Coating Std |
|---|---|---|---|---|---|---|
| Q235B | ASTM A36 | S235JR (EN 10025-2) | SS400 (JIS G3101) | ≥ 235 | 370 – 500 | ISO 1461 / ASTM A123 (610 g/m²) |
| Q355B (replaces Q345) | ASTM A572 Gr. 50 | S355JR (EN 10025-2) | SM490 (JIS G3106) | ≥ 355 | 470 – 630 | ISO 1461 / ASTM A123 (≥ 85 μm) |
| Q195 / Q215 | ASTM A283 Gr. C | S185 / S215 | SS330 | ≥ 195 – 215 | 315 – 430 | Continuous Galvanizing EN 10346 |
| DX51D+Z | ASTM A653 CS Type B | DX51D+Z (EN 10346) | SGCC (JIS G3302) | Lock-forming grade | 270 – 500 | Z100 to Z600 (Dual Face) |
*Values apply to profiles ≤16mm thickness. Exact yield strengths vary systematically with heavier gauge rolling profiles.
Export Compliance & Support
Localized Support, Inspection & Compliance Assurance
Comprehensive trade facilitation safeguards seamless border clearance and frictionless multi-standard contract execution.
Independent 3rd-Party Verification
Unrestricted access for global quality auditing agencies including SGS, BV, TÜV, and Intertek. Standard export documentation packages provide full traceability: Mill Test Certificates (EN 10204 3.1), spectrographic chemical assays, Elcometer coating reports, and Charpy V-notch impact tests.
Port Hub Logistics & Packing Protection
Strategic staging yards located just 40 km from Tianjin Port (Xingang) enable flexible consolidation of mixed containers (flat bars, H-beams, pipes) or break-bulk charter vessels. Moisture-barrier plastic wrapping and steel strapping protect rust-vulnerable white rust formation across long ocean voyages.
Strict Trade Finance & Incoterms Execution
Expert processing under FOB, CIF, CFR, and DDP terms with dedicated letter-of-credit compliance specialists. Comprehensive guidance for preferential Certificate of Origin documents (Form E, RCEP, COO) allows global EPC buyers to optimize regional tariff treatments.
Sourcing Strategic Value
Enterprise Sourcing Needs: Solving Structural Bottlenecks
How Tier-1 engineering contractors mitigate financial volatility, inventory shortages, and dimensional non-conformity.
Direct Mill Pricing & Hedging
Direct integration with Daqiuzhuang hot-rolled coil rolling schedules bypasses multi-tier intermediaries, providing transparent metric-ton pricing backed by Shanghai Futures Exchange (SHFE) raw material index-linked forward hedging mechanisms.
Mixed Bill of Materials (BOM) Consolidation
Eliminate fragmented supplier bases. Single-source contracts allow overseas project developers to consolidate hot-dip flat steel bars with H-beams, structural channels, scaffolding pipes, PVC valves, and deformed rebars into singular shipping manifests.
Pre-Galvanizing Precision Fabrication
Factory-processed punching, laser cutouts, edge chamfering, and stud welding prior to molten immersion guarantee continuous zinc skin over cut edges, avoiding vulnerable bare steel exposure caused by post-galvanizing field work.
Engineering FAQ
Frequently Answered Technical & Sourcing Inquiries
Authoritative metallurgical clarifications directly addressing procurement questions for international project buyers.
What is the key difference between hot-dip galvanized (HDG) and pre-galvanized flat bars?
Hot-dip galvanizing (HDG) involves immersing fully fabricated black carbon steel flat bars into a bath of molten zinc at 450°C, creating an alloyed coating between 85 μm and 120 μm thick covering all four sides and sheared edges. Pre-galvanized flat bars are continuous-slit from pre-coated zinc strip, resulting in un-galvanized exposed sheared edges and thinner zinc coatings (typically 15–25 μm). For outdoor, coastal, or buried earthing duties, batch HDG (ISO 1461 / ASTM A123) is essential for extended durability.
Where is HZXY located, and which loading port handles export shipments?
Tianjin Huizhong Xinyu (HZXY) is headquartered in Daqiuzhuang Industrial Zone, Jinghai District, Tianjin, with secondary facilities in Tangshan. Our primary sea freight export operations route through Tianjin Port (Xingang), situated within short trucking distance to optimize logistics cycles and lower freight inland haulage costs.
Can HZXY certify equivalence between Chinese GB grades and ASTM or EN specifications?
Yes. Chinese grade Q235B is metallurgically and mechanically certified equivalent to ASTM A36 and EN 10025-2 S235JR. High-strength Q355B (formerly Q345B) conforms to ASTM A572 Grade 50 and EN S355JR. Material Test Certificates (MTC 3.1) accompanying all shipments cite both domestic GB testing results and buyer-designated international ASTM/EN threshold parameters.
How does HZXY mitigate white rust (wet storage stain) during marine transit?
White rust occurs when newly galvanized reactive zinc surfaces encounter trapped moisture without free air circulation. We mitigate this through sodium dichromate passivation or environmentally compliant hexavalent-free chemical passivators post-galvanizing. Profiles are bundled with wooden dunnage spacers, wrapped in waterproof woven plastic fabrics, and secured with steel strapping inside ventilated dry containers.
Can custom holes, slots, and lengths be executed prior to galvanization?
Yes. Our in-house deep fabrication capabilities include automated CNC punching, waterjet/laser cutting, beveling, and robotic welding. Performing all machining operations prior to hot-dip galvanizing guarantees unbroken zinc layer encapsulation over all hole interiors and corner cutouts, eliminating atmospheric oxidation points.
Can global buyers combine different structural profiles into a single container order?
Yes. As an integrated producer across flat steel, wide-flange H-beams, U/C channels, scaffolding pipes, deformed rebars, and PVC drainage materials, our logistics department regularly consolidates multi-SKU Bills of Materials (BOM) into shared 20ft/40ft containers or bundled break-bulk shipments to minimize port handling overhead for overseas clients.
Expanded Engineering Inventory
Integrated Structural Sections & Fluid Conveyance Systems
Complete your supply chain requirement with factory-calibrated pipes, structural profiles, wire rod, and industrial infrastructure components.
Hot-Dip Galvanized Plain Round Bar
Smooth solid core bars precision-sized for tie-rods, dowels, and structural bracing.
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High-Tensile Concrete Deformed Rebar (6–12 mm)
Reinforcement rebars for bridge pilings, slab concrete, and foundations.
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Q235B / Q355B Hot & Cold Rolled Coil
High-formability master carbon coils ready for deep drawing and profile slitting.
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Prepainted PPGI / PPGL Color-Coated Coil
PVDF and high-durability polyester finishes for architectural roofing envelopes.
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SAE1080 / Q235 Hot Rolled High Carbon Wire Rod
High-purity wire rods engineered for high-stress pre-stressed wire and springs.
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3PE Anti-Corrosive Coated Pipeline Steel Pipe
High-pressure triple-layer polyethylene seamless/welded pipeline line pipe.
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Cast Steel Industrial Flow Control Valves
Resilient gate, butterfly, ball, and check valves matched to pipe systems.
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Engineered PVC-U Pressure & Drainage Pipes
Chemical-resistant thermoplastic piping systems for water supply and conduits.
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