Hot-Rolled Structural Sections & Precision Flats
Explore mill-standard carbon structural flat bars alongside consolidated building steel items immediately accessible from our Tianjin & Tangshan yard reserves.
Hot Rolled Q235B Carbon Steel Flat Bar
High weldability carbon bar tailored for baseplates, brackets, machinery components, and architectural ironwork.
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Black Solid Structural Flat Bar Q235 / Q355
Engineered for high-yield applications, 3–60 mm thickness with strict corner radius and parallel edge tolerances.
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HDG Galvanized Flat Steel Bar (3–60 mm)
Hot-dip zinc coated earthing flats and structural members for coastal infrastructure and outdoor frameworks.
Check HDG Specifications
A36 / Q235 Grade Structural H-Beam
Primary load-bearing elements supporting structural workshop framing, multi-level infrastructure, and bridges.
Explore H-Beam Range
Perforated Galvanized Carbon Steel Angle
Pre-punched equal and unequal angles optimized for solar racking, electrical transmission, and modular trusses.
See Angle Specifications
Hot Rolled Galvanized Channel Steel
Standard U/C profile channels for purlins, equipment mounting skids, and architectural curtain-wall backup frames.
Request Channel Pricelist
Hot Rolled & Cold Rolled Carbon Steel Coil
Master coils with slitting options, serving as continuous feedstock for cold-formed sections and custom flat bar lines.
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Galvanized Scaffolding & Structural Pipe
High-yield round ERW tubing used concurrently with flat bars in building scaffolding, bracings, and frames.
Inspect Steel Pipe LineDiscount Black Steel Flat Bar Factories: The China Advantage
A granular look at the metallurgic foundations, rolling mill synergies, and competitive cost drivers behind Chinese hot-rolled black flat bar production in Daqiuzhuang, Tianjin.
Daqiuzhuang Cluster Synergies
Situated within the world’s densest steel manufacturing cluster in Jinghai, Tianjin, HZXY harnesses an end-to-end ecosystem: blast furnace billeting, hot continuous bar rolling, and close-proximity freight yards. This geographic proximity cuts intermediate transit and furnace reheating overheads, generating sustainable 8–15% bill-of-material cost advantages for export buyers.
Scale Economics & Yield Optimisation
With an annual capacity topping 10 million tons across 1,500 acres in Tianjin and Tangshan, modern automated high-speed rolling lines minimize roll pass deviations. Raw billet transformation efficiency exceeds 98.2%, drastically suppressing scrap costs on standard ASTM A36, Q235B, and EN S235JR black flat bars, passing volume discounts straight to wholesale buyers.
In-House Secondary Fabrication
Unlike raw steel brokers, HZXY performs integrated in-house post-rolling services: CNC shearing, multi-spindle drilling, punching, hot-dip galvanizing, and chamfering. Supplying semi-finished or installation-ready flat bar components directly from the mill cuts site-handling labor hours and saves valuable container volume space for overseas engineering contractors.
Black Steel Flat Bar Dimensions, Weights & Indicative Pricelist
Reference theoretical weights and baseline mill-gate pricing ranges across standard hot-rolled structural flat steel grades. Actual export quotations fluctuate based on iron ore dynamics, billet index, and packaging tier.
| Metric Size (mm) | Imperial Equiv. (in) | Theoretical Wt (kg/m) | Material Grades | Standard Length | Indicative Price FOB (USD/Ton) |
|---|---|---|---|---|---|
| 12 × 3 | 1/2" × 1/8" | 0.283 | Q235B / A36 / S235JR | 5.8m / 6.0m / 12.0m | $495 – $545 |
| 25 × 5 | 1" × 3/16" | 0.981 | Q235B / SS400 / A36 | 5.8m / 6.0m / 12.0m | $485 – $535 |
| 40 × 6 | 1-1/2" × 1/4" | 1.884 | Q235B / Q355B / S355JR | 6.0m / Fixed Cut | $475 – $520 |
| 50 × 8 | 2" × 5/16" | 3.140 | Q235B / A36 / S235JR | 6.0m / 11.8m | $465 – $515 |
| 75 × 10 | 3" × 3/8" | 5.888 | Q355B / A572 Gr.50 | 6.0m / 12.0m | $480 – $530 |
| 100 × 12 | 4" × 1/2" | 9.420 | Q235B / Q355B / A36 | 6.0m / 12.0m | $460 – $510 |
| 150 × 16 | 6" × 5/8" | 18.840 | Q355B / S355JR / A572 | 6.0m / Cut-to-length | $470 – $525 |
| 200 × 20 | 8" × 3/4" | 31.400 | Q355B / A36 / SM490 | 6.0m / Custom Project | $485 – $540 |
Global Sourcing Demands & Industry Evolutions
How progressive green metallurgy, strict dimensional tolerances, and multi-product container consolidation are reshaping how international EPC entities and steel distributors source flat bar materials.
Green Metallurgy & Carbon Accounting
Global procurement directives in Europe and the Americas increasingly require Environmental Product Declarations (EPDs). HZXY integrates energy-efficient electric arc furnace (EAF) blending, waste heat recuperators, and continuous descaling technologies to reduce embodied carbon footprint per metric ton across hot-rolled flat bars.
Full Package BOM Consolidation
Global contractors struggle when dealing with disconnected vendors for plates, structural beams, and pipes. Operating under a single 1,500-acre complex, HZXY bundles black flat steel bars with H-beams, channel sections, rebar, ERW steel pipes, and PVC conduits inside unified shipping manifests, drastically cutting sea-freight and customs overhead.
Stringent Surface & Edge Tolerances
Modern automated laser cutters and robotic welders demand exceptional flatness, uniform cross-sectional thickness, and minimal edge camber. Our modern multi-stand flat rolling mills adhere strictly to GB/T 704, EN 10058, and ASTM A6 tolerances, eliminating post-delivery straightening delays on automated assembly floors.
Localized Engineering Applications & Macro Solutions
How black steel flat bars serve as mission-critical building blocks across diverse regional construction and heavy manufacturing sectors worldwide.
Baseplates & Stiffeners
Welded perpendicular to H-beams and columns, flat bars provide critical moment-connection stiffening, load spreading, and joint gusseting in pre-engineered steel buildings (PEB).
Machinery & Heavy Fabrication
Used extensively as wear strips, mounting rails, industrial machine framing, and hydraulic bracket mountings where tight corner radii and consistent hardness are demanded.
Electrical Earthing & Grounding
Black and galvanized flat bars serve as continuous perimeter grounding grids and lightning dissipation rings for electrical sub-stations, data centers, and renewable energy parks.
Grating & Architectural Trim
Serving as high-strength bearing bars in forge-welded steel walkway gratings, mezzanine floors, safety balustrades, and structural security grilles.
Enterprise Quality Assurance & Material Testing
Eliminate risk through certified chemical trace analyses, mechanical integrity testing, and transparent third-party inspection standards endorsed across 50+ export jurisdictions.
EN 10204 3.1 Certified MTC
Every shipment of flat steel leaves our freight gate accompanied by full mill test certificates outlining optical emission spectrometry results (C, Mn, Si, P, S) and tension, yield, and Charpy V-notch impact verification.
Laser Dimensional Verifications
Online non-contact laser measurement sensors record continuous thickness and edge width variations along each bar, ensuring precision tolerances conforming to ISO 9001 and strict buyer guidelines.
Third-Party Pre-Shipment Inspection
We actively facilitate independent pre-shipment verification by global authorities including SGS, BV, and Intertek—validating dimensions, bundle weights, surface finish, and container packing before departure from Tianjin Port.
Frequently Asked Questions: Flat Bar Procurement
Clear, direct answers regarding steel grading, export packaging, delivery timelines, and international commercial terms.
What is the standard mill lead time for bulk black steel flat bars?
Standard stocked dimensions (20×3mm to 100×12mm in Q235B / ASTM A36) typically load within 7 to 10 days from our Tianjin freight yard. Bespoke rolling cycles or tailored cut-to-length orders ship within 15 to 25 days.
How does Q235B compare directly against ASTM A36 and S235JR?
Chemically and mechanically, Chinese GB Q235B is an equivalent to ASTM A36 and European EN 10025 S235JR. It provides a minimum yield strength of 235 MPa (for thicknesses ≤16mm), exceptional ductility, and excellent arc weldability without pre-heating.
Can I combine flat bars with H-beams, pipes, and coils in a single order?
Yes. As a comprehensive structural manufacturer producing profiles, coils, pipes, and plastic fittings, we specialize in consolidated mixed-container and break-bulk loading, significantly cutting international port clearance fees.
What export packaging standards are applied to protect against rust?
Flat bars are banded with heavy-gauge steel strapping in 2 to 3-ton bundles with lifting wire loops. For sea freight voyages, we offer rust-inhibiting light oiling, waterproof plastic wrapping, or fully galvanized treatments upon request.
Where is HZXY located, and which port handles export shipments?
HZXY is headquartered in Daqiuzhuang Industrial Zone, Jinghai, Tianjin, with secondary facilities in Tangshan. Almost all overseas cargo moves smoothly via Tianjin Port (Xingang), situated less than 80 kilometers from our mills.
What payment and commercial terms do you support?
We work flexibly under standard Incoterms including FOB, CFR, and CIF. Financial settlements are commonly structured via Irrevocable Letters of Credit (L/C at sight) or T/T wire transfers backed by contractual trade documentation.
Consolidated Procurement: Long Products & MEP Infrastructure
Source complementary structural steels, fluid handling pipes, and civil materials directly from HZXY manufacturing yards to optimize shipping logistics and pricing tiers.
Deformed Concrete Rebar (6 mm – 12 mm)
High-tensile deformed reinforcing carbon rebar for foundation rafts, floor slabs, and civil infrastructure piles.
See Long Steel Sections
Galvanized Plain Round Bar
Hot-dip zinc protected solid round carbon bars for dowel rods, structural ties, shafts, and general manufacturing.
Explore Round Bars
Hot Rolled Wire Rod (8 mm & 12 mm)
Supplied in compact industrial coils for mesh welding, fastener forging, drawing, and cold heading.
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Double-Coated PPGI / PPGL Steel Coil
Prepainted continuous galvanised coils for corrugated architectural roofing panels and insulated wall cladding.
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Structural Black Steel Pipe In-Stock
Welded hollow sections designed for architectural columns, fluid lines, and structural bracing trusses.
Browse Steel Pipes
Pressure-Resistant HVAC & Utility Valves
Gate, ball, and check valves matched precisely to your industrial piping layouts, avoiding site integration issues.
Inquire Industrial Valves
DX51D–DX54D Galvanized Steel Coil
High formability zinc-coated sheet with customized spangle weights, ideal for ducting and enclosure fabrication.
Examine Coil Sizes
Plastic Drainage & Water Supply Pipes
Complete MEP piping systems engineered for civil drainage, power cabling conduit, and water utilities.
View Plastic MaterialsRequest Direct Factory Quotation & Sample Inspection
Submit your bill of materials (BOM), custom dimension cut sheets, or target port destination. Our metallurgical sales engineers reply with full FOB/CIF pricing within 24 business hours.