HDG Q235B / Q355B Flat Steel Bar (3–60 mm)
CE certified S235JR/S355JR equivalent with heavy zinc coating for earthing, substations, and marine applications.
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Direct Mill Product Portfolio
CE-Compliant Carbon Steel Flat Bars & Structural Products
Explore certified structural profiles, hot-rolled flat bars, and precision steel grades manufactured at our Tianjin and Tangshan industrial hubs, maintained with year-round readiness for international dispatch.
Hot Rolled Q235B Carbon Steel Flat Bar
Standard architectural and structural grade with superior bendability, smooth edge shearing, and strict dimensional tolerances.
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Black Structural Flat Bar Q355B / S355JR
High-yield hot rolled solid carbon steel flat section optimized for machinery framing, baseplates, and high-stress joints.
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A36 / Q235B Structural H-Beam Flange
Certified broad-flange heavy structural sections for column cores and girders, certified under CPR 305/2011.
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Galvanized Structural Angle Bar (L-Profile)
Equal and unequal structural angle sections, pre-slotted or solid, designed for modular telecom towers and solar racking.
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Hot Rolled Galvanized U/C Channel Steel
Precision roll-formed channels compliant with EN 10279; ideal for civil purlins, automotive framing, and brackets.
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Galvanized Plain Carbon Steel Round Bar
Hot-dip zinc protected solid bar stock offering tight concentricity and uniform yield strength for industrial bolts and shafts.
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Deformed High-Tensile Steel Rebar (6–12 mm)
High-bond deformed rebar compliant with BS 4449 / ASTM A615 for seismic civil infrastructure and precast concrete elements.
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Regulatory & Engineering White Paper
CE Certification Framework for Structural Carbon Steel Flat Bars
A technical guide to Factory Production Control (FPC), EN 10025 harmonization, and Eurocode 3 execution requirements for global procurement directors.
CPR 305/2011 & System 2+
Under the EU Construction Products Regulation (CPR 305/2011), structural carbon steel flat bars must strictly conform to EN 10025-1 and EN 10025-2. HZXY operates continuous Factory Production Control (FPC) audited by independent Notified Bodies. This mandates initial type testing, continuous ladle sample spectrometry, Charpy V-notch impact verification, and a valid Declaration of Performance (DoP) accompanied by CE marking.
Metallurgical Equivalence & Yield
Specifying engineers across Europe, the Middle East, and Latin America frequently navigate cross-standard equivalences. Chinese standard GB/T 700 Q235B and GB/T 1591 Q355B map with precision to European S235JR and S355JR under EN 10025-2, and US ASTM A36. We guarantee minimum yield points (≥235 MPa up to ≥355 MPa for nominal thicknesses ≤16 mm) with strict control over Carbon Equivalent Values (CEV ≤0.38% – 0.45%) for flawless weldability.
EN 10204 3.1 & 3.2 Traceability
Every commercial bundle of carbon steel flat bar leaving our loading yards is permanently embossed, tagged with heat/batch numbers, and dispatched alongside genuine EN 10204 Type 3.1 Inspection Certificates. We provide end-to-end chemical spectrometry (C, Si, Mn, P, S, Cr, Ni, Mo) and mechanical test records (tensile strength, yield strength, elongation, and impact values). Third-party inspections via SGS, Bureau Veritas, or DNV are routinely facilitated.
Procurement Benchmark Q2/Q3 2026
CE Carbon Steel Flat Bar Sizing & Indicative Price Matrix
Reference factory-gate and FOB export pricing derived from live raw billet indices, standard metallurgical chemistry, and EN 10058 dimensional tolerances.
| Dimension (Width × Thk) | EN / GB Equivalent Grade | Yield / Tensile Strength | Standard Length | Weight (kg/m) | FOB Tianjin Indicative (USD/Ton) | Key Application Arena |
|---|---|---|---|---|---|---|
| 20 × 3 mm – 30 × 5 mm | EN 10025 S235JR / Q235B | ≥ 235 MPa / 360–510 MPa | 5.8m / 6.0m / Custom | 0.471 – 1.178 | $520 – $580 | Substation earthing, electrical hardware, light brackets |
| 40 × 4 mm – 60 × 8 mm | EN 10025 S235JR / Q235B | ≥ 235 MPa / 360–510 MPa | 6.0m / 11.8m / 12.0m | 1.256 – 3.768 | $505 – $560 | Architectural fencing, grating bars, general fabrication |
| 65 × 6 mm – 100 × 12 mm | EN 10025 S355JR / Q355B | ≥ 355 MPa / 470–630 MPa | 6.0m / 12.0m | 3.062 – 9.420 | $545 – $610 | Structural baseplates, truck chassis, industrial platforms |
| 120 × 10 mm – 200 × 20 mm | EN 10025 S355JR / Q355B | ≥ 345–355 MPa / 470–630 MPa | 6.0m / 12.0m | 9.420 – 31.40 | $560 – $630 | Heavy bridge stiffeners, shipbuilding flanges, crane girders |
| Hot-Dip Galvanized (Any Size) | HDG ISO 1461 / EN 10025 | Grade Matched (610g/m²) | 6.0m Standard | Varies (+4-7% Zn) | $640 – $730 | Marine installations, outdoor solar grounding, power pylons |
*Prices vary based on iron ore fluctuations, coking coal indices, order volume, and customized cut-to-length/galvanizing requirements. Inquire directly for project-specific binding quotes.
1996
Pioneering Production Est.
10M+
Metric Tons Annual Capacity
1,500
Acres of Integrated Mills
50+
Exporting Global Markets
Industrial Dynamics & Use Cases
Localized Engineering Application Scenarios & Global Footprint
How carbon steel flat bars serve critical infrastructure around the world, from regional utility earthing to heavy manufacturing.
Grid Earthing & Power Sub-Stations
Hot-dip galvanized flat bar (25×4 mm, 40×4 mm, 50×5 mm) is the international standard for subterranean lightning protection grids and electrical earthing networks in desert and coastal installations across the Middle East and Africa.
Civil Grating & Structural Stairways
Engineered flat bars provide the load-bearing cross-bars for industrial catwalks, oil platform drainage walkways, and airport logistics mezzanines. Strict thickness control prevents deflection under dynamic pedestrian and vehicle loads.
Automotive, Trailers & Machinery
Utilized extensively across European and Southeast Asian commercial vehicle factories for chassis crossmembers, leaf spring assembly spacers, agricultural ploughs, and precision stamping components demanding tight corner radii.
Heavy Shipbuilding & Bridge Trussing
High-tensile S355JR flat steel provides structural stiffening ribs across cargo holds, maritime hull framing, and suspension bridge tensioning links, where brittle fracture resistance at sub-zero temperatures (Charpy V-notch at 0°C – -20°C) is non-negotiable.
Supply Chain Excellence
China Factory Supply Chain Resilience & Efficiency Advantages
Located in the heart of Daqiuzhuang, Tianjin, and Tangshan—the world's most consolidated steelmaking nexus.
The Daqiuzhuang Industrial Cluster Advantage
Our headquarters in the Daqiuzhuang Industrial Zone (Tianjin) and supplementary base in Tangshan span over 1,500 acres. Within a 30-kilometer radius, we source continuous billets, operate 12 advanced slitters, rolling stands, and large-scale automated hot-dip galvanizing lines. This proximity slashes domestic freight overhead, minimizes inter-facility transport wear, and eliminates intermediary markups.
10M+ Tons Scale & Fast-Track Delivery
With an annual processing capacity exceeding 10 million metric tons, we buffer hundreds of standard sizes in year-round raw and galvanized stock. While European mills typically quote 12 to 18-week lead times for bespoke non-standard carbon flat bar rollings, HZXY can manufacture, deep-cut, punch, bundle, and clear customs within 10 to 18 days from our Tianjin base.
Full Multi-Product Consolidation
Global EPC contractors and stockists rarely need flat bars in isolation. HZXY solves procurement fragmentation by consolidating complete structural bills of materials: pairing carbon steel flat bars with H-beams, angle steels, channels, rebar, pipes, and pipeline valves into unified 20GP/40HQ container shipments, significantly minimizing customs friction and terminal clearance handling fees.
Technology Roadmap
Future Outlook: Low-Carbon Steel & EU CBAM Readiness
Anticipating the technological shift in carbon steel metallurgy, precision tolerances, and sustainable export standards.
EAF & Green Hydrogen Smelting
As the European Carbon Border Adjustment Mechanism (CBAM) phases in mandatory emissions pricing, HZXY is transitioning structural bar production toward Electric Arc Furnace (EAF) recycling scrap routes and hydrogen-enriched blast furnaces. Our environmental declarations align with EN 15804 EPDs, tracking embodied carbon from ore to pier to protect buyers against border tariffs.
AI Laser Profiling & Smart Sorting
We have integrated continuous in-line AI laser profilometers across our high-speed finishing mills. Every millimeter of carbon steel flat bar is automatically scanned for surface micro-fissures, width deviance, and edge camber according to EN 10058 fine tolerances, automatically segregating substandard bars prior to bundling.
Advanced Micro-Alloying & Z-Direction Strength
Future structural demands require superior seismic safety. Our metallurgical engineers utilize micro-alloying techniques incorporating Vanadium (V), Niobium (Nb), and Titanium (Ti) to fine-tune grain sizes, ensuring exceptional through-thickness properties (Z15–Z35) preventing lamellar tearing during thick-flange welding.
Risk Mitigation
Localized Support, Incoterms & Compliance Assurance
Comprehensive risk-free commercial frameworks tailored for procurement departments, civil engineers, and trade houses.
Multilingual Technical Support
Our sales engineering unit has over 30 years of export experience. Every client is assigned a dedicated order coordinator who fluent in steel chemistry, CAD fabrication blueprints, and international contract terms, responding across time zones within 24 hours.
Flexible Incoterms & Trade Finance
We accommodate varied commercial structures: FOB Tianjin, CIF European Main Ports (Rotterdam, Antwerp, Hamburg), CFR Jebel Ali, and DDP to regional distribution depots. Payment mechanisms include Irrevocable Letters of Credit (L/C at sight) and flexible T/T milestones.
Maritime Packaging & Rust Prevention
Carbon steel flat bars undergo strict marine packing: multi-point high-tensile steel strapping, corner edge protectors, waterproof plastic wrapping, and desiccants to resist sea-salt corrosion. Specialized open-top or breakbulk dunnage stowage ensures dead-straight discharge.
Procurement Knowledge Base
Frequently Asked Questions (FAQ)
In-depth responses to core engineering and transactional inquiries from global importers.
What is the explicit legal validity of your CE Certification?
Our structural steel products, including flat bars, profiles, and hollow sections, comply fully with the European Union CPR (Regulation 305/2011/EU) under harmonized standards EN 10025-1 and EN 10025-2. Mill production control is audited by accredited European Notified Bodies, qualifying our CE marks for civil and commercial tenders throughout the European Economic Area (EEA).
How does Q235B / Q355B translate to ASTM and EN grades?
Q235B is metallurgically and mechanically equivalent to EN 10025-2 S235JR and ASTM A36 (with yield points ≥235 MPa). Q355B (which replaced older grade Q345B under GB/T 1591-2018) is the direct equivalent to EN 10025-2 S355JR and ASTM A572 Grade 50 (yield point ≥355 MPa). Both feature controlled carbon equivalencies, providing exceptional weldability.
Can you provide deep processing before export?
Yes. Beyond standard hot rolling and shearing, our facilities house CNC saw cutting, laser slotting, precision hole punching, chamfering, structural welding, and large-scale hot-dip galvanizing according to ISO 1461 / ASTM A123. Material arrives on site prefabricated and ready for immediate erection.
Are third-party inspections allowed prior to bill of lading issuance?
Absolutely. We welcome and routinely coordinate on-site third-party inspections through global agencies including SGS, Bureau Veritas, Intertek, and DNV. Inspectors are granted complete access to verify dimensions, coating thickness, surface aesthetics, and witness mechanical lab tests.
What is your Minimum Order Quantity (MOQ) for flat bars?
For sizes held in standard inventory, our MOQ is as low as 1 to 5 metric tons per specification. For custom mill rollings requiring special tooling or specific alloy chemistry, standard minimums are typically 10 to 25 metric tons. We also accommodate mixed-size container consolidations.
Where are your primary shipping gateways located?
The vast majority of our ocean shipments depart directly from Tianjin Port (Xingang), situated less than 70 kilometers from our Daqiuzhuang rolling and warehouse cluster. This proximity ensures optimal container positioning and reduced terminal drayage costs. Other major Chinese ports can be arranged upon request.
Integrated Steel & Infrastructure Catalog
Essential Sourcing: Structural Steels, Coils & Industrial Systems
Combine high-grade carbon steel flat bars with essential structural sections, coils, and fluid conveyance pipelines in a consolidated shipment.
Q235B / Q355B Carbon Steel Coils (HR & CR)
Hot rolled coils for structural pipe fabrication, and cold rolled fine finish coils for deep drawing and precision stamping.
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DX51D – DX54D Galvanized Steel Coils
Continuous hot-dip galvanized steel coil with regular/zero spangle, zinc mass 40–275g/m² for roofing and HVAC ducts.
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HDG Scaffolding & Structural Steel Pipe
High-tensile load-bearing circular hollow sections (CHS) for heavy construction staging and agricultural frames.
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Anti-Corrosion 3LPE / FBE Coated Steel Pipe
Certified steel line pipe with multi-layer protective coatings for gas transmission, crude oil pipelines, and water mains.
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High Carbon & Mild Steel Wire Rod (SAE1008/1080)
Prime coiled wire rods for bright wire drawing, mesh welding, structural prestressing strands, and fast-turnaround fastener production.
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Heavy Industrial Pipeline Control Valves
API and CE certified cast and forged gate, butterfly, check, and ball valves engineered to match project piping systems.
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Municipal PVC-U & HDPE Pipeline Systems
Comprehensive underground water supply, gravity drainage, and communication conduit systems ship directly with structural steel.
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Integrated Structural Heavy Sections & Profiles
Complete project steel packages: Universal columns, I-beams, hollow tubes, channels, and flat sections bundled for efficient logistics.
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Ready For Direct Procurement?
Request Your CE Certified Carbon Steel Flat Bar Quotation
Download our comprehensive technical specification catalog, review complete EN 10204 3.1 test mill certificates, and secure competitive direct-factory mill pricing within one business day.