Huaxia-Steel is a leading factory-direct exporter of carbon steel flat bars for structural, manufacturing, and fabrication applications worldwide. Our flat bars are hot-rolled, cold-drawn, or precision-ground to exact customer specifications. We supply to importers, steel service centers, fabricators, and OEM manufacturers with full mill test certification and competitive export pricing.
Product Overview
A carbon steel flat bar is a rectangular cross-section product with width greater than thickness, produced by hot rolling, cold drawing, or cutting from plate. Flat bars are among the most versatile carbon steel products — used in everything from structural bracing and machinery frames to agricultural equipment, automotive components, and general fabrication. Their simple geometry makes them easy to cut, drill, weld, and machine.
Specifications & Dimensions
| Parameter | Range | Standard |
|---|---|---|
| Thickness | 3mm – 100mm (1/8″ – 4″) | ASTM A6 / EN 10058 |
| Width | 10mm – 600mm (3/8″ – 24″) | ASTM A6 / EN 10058 |
| Length | 3m, 4m, 6m, 12m, or cut-to-length | Standard mill lengths |
| Edge Condition | Mill edge, sheared edge, saw cut | Per customer requirement |
| Surface Finish | Hot-rolled (black), cold-drawn (bright), pickled & oiled | Per customer requirement |
| Straightness | ≤ 0.0015 × length (standard); ≤ 0.0005 (precision) | ASTM A6 |
Available Grades
We supply carbon steel flat bars in a comprehensive range of grades, from general structural to high-strength and medium-carbon wear-resistant grades:
| Grade | C% | YS min (MPa) | TS min (MPa) | EL% min | Application |
|---|---|---|---|---|---|
| A36 / SS400 | ≤0.26 | 250 | 400-550 | 20 | General structural, fabrication |
| A572 Gr.50 | ≤0.23 | 345 | 450 | 18 | High-strength structural |
| 1045 / S45C | 0.43-0.50 | 340 (norm) | 585 (norm) | 16 | Machined parts, shafts, gears |
| 1050 / S50C | 0.48-0.55 | 365 | 635 | 14 | Wear plates, tool holders |
| 5140 / SCr440 | 0.38-0.43 | 590 (Q&T) | 780 (Q&T) | 15 | Alloy steel, higher strength |
| 4140 / SCM440 | 0.38-0.43 | 830 (Q&T) | 1030 (Q&T) | 12 | High-strength alloy, shafts |
| 8620 / SNCM220 | 0.18-0.23 | 440 (case hard.) | 640 (case hard.) | 16 | Case-hardening, gears, pins |
Tolerances
| Thickness (mm) | Width Tolerance (mm) | Thickness Tolerance (mm) | Standard |
|---|---|---|---|
| 3-6 | ±0.75 | ±0.30-0.40 | EN 10058 |
| 6-10 | ±0.90 | ±0.30-0.50 | EN 10058 |
| 10-18 | ±1.10 | ±0.40-0.60 | EN 10058 |
| 18-30 | ±1.30 | ±0.50-0.70 | EN 10058 |
| 30-50 | ±1.60 | ±0.60-0.80 | EN 10058 |
| 50-80 | ±2.00 | ±0.80-1.00 | EN 10058 |
| 80-100 | ±2.50 | ±1.00-1.20 | EN 10058 |
Quality Assurance
- Raw Material Traceability: Every flat bar is traceable to its original heat number. Full mill test certificates (EN 10204 3.1) provided with each shipment.
- Dimensional Verification: 100% dimensional check for thickness, width, length, straightness, and twist against specified tolerances.
- Surface Quality: Visual inspection for surface defects including scale, seams, laps, and scratches per ASTM A6 or EN 10163 Class A standard.
- Mechanical Properties: Tensile test per ASTM A370 for every heat. Hardness testing (HBW) available for medium/high carbon grades.
- Third-Party Inspection: SGS, Bureau Veritas, Intertek, or TUV inspection available upon request at competitive rates.
Packaging & Shipping
Flat bars are packaged in bundles of 2-3 metric tons, steel-strapped with wooden dunnage between layers. Bundles are tagged with grade, size, heat number, and bundle weight. Optional packaging includes:
- Standard Export: Bare bundles with steel strapping and edge protectors.
- Oil-Coated: Anti-rust oil application for sea freight protection.
- VCI Wrapped: Volatile Corrosion Inhibitor paper/plastic wrap for extended sea voyages.
- Wooden Crated: Full wooden case for precision ground flat bars with critical surface finish.
Delivery lead time: 10-20 days for stock sizes, 20-30 days for mill-rolled sizes. We ship from major Chinese ports (Shanghai, Tianjin, Qingdao, Ningbo, Guangzhou) with flexible FOB, CFR, and CIF terms.
Ready to source high-quality carbon steel products at competitive factory-direct prices? Contact Huaxia-Steel today for a free quotation and consultation. Our team provides full Mill Test Certificates (MTC), third-party inspection reports, and flexible shipping options worldwide.
