Featured Mill-Stocked Steel & Square Bar Profiles
Full-dimensional coverage with export-ready packaging, custom cut-to-length services, and strict mill test certification (MTC) for global structural projects.
Solid Square Bar (10mm - 150mm)
- Q235B / Q355B
- ASTM A36
- Hot Rolled
A36 / Q235 Hot Rolled H-Beam
- ASTM A36
- EN 10025
- Custom Length
Equal / Unequal Angle Steel
- Galvanized
- Perforated
- Rigid Support
Hot Rolled U/C Channel Steel
- High Strength
- Galvanized
- Standard Web
Q235B Structural Flat Bar
- 3-60mm Thk
- 6m Length
- Clean Edge
High Corrosion Round Steel Bar
- Hot-Dip Galv
- Smooth Finish
- Machinable
Q235B / Q355B Steel Coil
- Hot / Cold Rolled
- Bright Finish
- Slit Options
Galvanized Scaffolding Steel Pipe
- ERW Welded
- Load Bearing
- Anti-Rust
Engineering Trends & Global Procurement Drivers for Square Bar Sizes
Solid square bar steel has evolved from an ordinary structural bar into an engineered, high-precision foundational stock utilized across critical infrastructure, automated machinery, and offshore structures.
Evolution of Calibrated Dimensional Tolerances
Modern CNC milling, laser cutting, and automated fabrication lines require ultra-tight tolerance thresholds (e.g., ISO h9 to h11 standards). Contemporary square bar sourcing heavily emphasizes cold-drawing and precision sizing to eliminate downstream surface milling operations and maximize cycle time savings.
Direct-from-Mill Discount Economics
Procurement teams are actively bypassing intermediaries to combat localized pricing volatility. Sourcing discount square bar sizes directly from Tangshan and Tianjin production clusters reduces margin stack-up, allowing bulk EPC contractors to secure indexed raw material pricing with predictable lead times.
Advanced Protective Metallurgy & Coating
With infrastructure expanding into aggressive tropical and marine settings, solid square bars require superior atmospheric protection. Advanced hot-dip galvanizing meeting ASTM A123 and ISO 1461 guarantees over 85 microns of zinc protection, providing multi-decade longevity without structural degradation.
China Factory 4.0: Supply Chain Resilience & Scale
Headquartered inside Daqiuzhuang, Tianjin, and Tangshan—the world's most concentrated steel manufacturing belt—Tianjin Huizhong Xinyu (HZXY) combines massive rolling infrastructure with digital supply chain oversight.
10M+ Tons Annual Capacity
Spread over 1,500 acres of advanced continuous casting and rolling mills, ensuring stable billet availability and constant order fulfillment without delay.
Tianjin Port Freight Gateway
Immediate proximity to Tianjin Xingang allows swift containerized and break-bulk vessel stowage, lowering overland haulage expenses and transit lead times.
Complete MTC & Inspection
Every shipment is delivered with verified EN 10204 3.1 Mill Test Certificates. Third-party testing by SGS, BV, or Intertek is routinely integrated on-site.
One-Stop Project Consolidation
Consolidate solid square bars, H-beams, angle steel, wire rods, steel tubes, PVC conduit, and industrial valves within a unified Bill of Lading.
Standard Square Bar Sizes, Weight & Tolerance Reference
Below is the core engineering selection matrix for standard hot-rolled and cold-drawn solid square bars, manufactured in full accordance with ASTM A36, GB/T 700 (Q235B), and GB/T 1591 (Q355B).
| Dimension (Side mm) | Imperial Equivalent (in) | Cross-Section Area (cm²) | Theoretical Weight (kg/m) | Standard Tolerances (mm) | Typical Mechanical Application |
|---|---|---|---|---|---|
| 10 x 10 mm | 3/8" | 1.00 | 0.785 | ±0.30 | Security grills, ornamental ironwork, brackets |
| 12 x 12 mm | 1/2" | 1.44 | 1.130 | ±0.30 | Fencing balustrades, light structural ties |
| 16 x 16 mm | 5/8" | 2.56 | 2.010 | ±0.40 | Machined shafts, anchor framing, bracing |
| 20 x 20 mm | 3/4" | 4.00 | 3.140 | ±0.40 | Conveyor guides, crane tracks, equipment bases |
| 25 x 25 mm | 1" | 6.25 | 4.910 | ±0.50 | Heavy plant machinery, structural keys, pins |
| 32 x 32 mm | 1-1/4" | 10.24 | 8.040 | ±0.50 | Hydraulic cylinder components, forged tooling |
| 40 x 40 mm | 1-1/2" | 16.00 | 12.56 | ±0.60 | Heavy railway ties, structural load spacers |
| 50 x 50 mm | 2" | 25.00 | 19.63 | ±0.80 | Shipbuilding frames, massive machine frames |
| 75 x 75 mm to 150 x 150 mm | 3" to 6" | 56.25 - 225.0 | 44.16 - 176.6 | ±1.20 to ±2.00 | Heavy forging billets, primary industrial bases |
Global Standards Cross-Reference: GB vs ASTM vs EN vs JIS
Under GB/T 1591-2018, Chinese mills replaced the historical Q345 grade with Q355 (raising guaranteed yield strength to 355 MPa). When procuring discount square bar sizes for tenders framed under ASTM A572 Gr. 50, EN 10025 S355JR, or JIS SM490, HZXY delivers certified Q355B material with dual-certification compatibility for chemical and tensile thresholds.
Industrial Implementation & Field Scenarios
Solid square bar sizes serve diverse structural and fabrication roles across leading construction and manufacturing domains worldwide.
Structural Steel Erection & Girders
Used as cross-bracings, rigid column infills, and crane rails for large-span distribution warehouses, industrial processing facilities, and overhead transport structures.
Marine & Long-Span Bridge Works
Proven on landmark achievements such as the Qingdao Jiaozhou Bay Bridge, where high-tensile solid square bars resist cyclic wind stress and marine corrosion.
Civil Foundations & Heavy Machinery
Engineered into machine drive shafts, solid structural guide rails, foundation pile cap anchors, and heavy transport equipment chassis.
Full In-House Processing: Ready-To-Install Steel
Eliminate site labor bottlenecks and container dead weight with precision pre-shipment deep processing directly inside our Daqiuzhuang manufacturing complex.
Cut-To-Length Precision Sawing
Multi-blade CNC band saws and circular cold sawing allow tolerance bands within ±1.0mm, deburring sharp edges and optimizing intermodal container space.
Industrial Drilling & Punching
Pre-drilled mounting slots, connecting pin holes, and countersunk apertures prepared precisely to customer CAD drawings prior to surface treatment.
Hot-Dip Galvanizing & Coating
Integrated chemical pickling and molten zinc immersion facilities ensuring uniform metallurgical alloy bonding compliant with ASTM A123 / EN ISO 1461.
Frequently Asked Questions: Sourcing Square Bar Sizes
Clear, expert responses to technical parameters, commercial terms, and global export handling.
What are the most popular discount square bar sizes available for export?
Where is HZXY located, and which ports handle vessel dispatch?
Which steel grades and structural standards can be guaranteed?
Can overseas buyers combine square bars with other steel sections in one shipment?
Do you accept third-party independent inspections prior to seaport loading?
Explore Complete Structural & MEP Product Lines
Consolidate your Bill of Materials from our 1,500-acre mill production lines with streamlined export dispatch.
Structural Steel I-Beam Profiles
- ASTM / GB
- Heavy Load
- Welded / Rolled
Deformed Concrete Rebar (6-32mm)
- High Tensile
- Tagged Bundles
- Concrete Reinforce
DX51D–DX54D Galvanized Coil
- EN 10346
- Zinc 40-275g
- Forming Grade
HDG Flat Steel for Grounding
- Anti-Corrosion
- 3-60mm Thick
- 6m Standard
PPGI / PPGL Color Coated Coil
- RAL System
- Roofing Grade
- UV Resistant
Pressure-Rated Pipeline Valves
- Gate / Ball / Check
- Cast Steel
- HVAC / Water
PVC Municipal Drainage Pipe
- Smooth Flow
- Impact Proof
- Corrosion Free
Water Supply & Conduit Pipes
- Pressure Test
- Standard Joint
- MEP Packages
Download Complete 2026 Square Bar Sizes & Profile Catalog
Access comprehensive dimensions, weights, tolerance tables, and indexed mill pricing. Request your instant project quote directly from HZXY's international export department.