Carbon Steel Square Bar — Factory Direct Supplier | Huaxia-Steel
Carbon steel square bar is a versatile solid section used in machinery frames, fixtures, support structures, and general fabrication. Its four equal sides make it easy to align, weld, and machine, and it is available in a wide range of sizes from small precision bars to large hot-rolled sections. Huaxia-Steel supplies carbon steel square bar directly from Chinese mills, offering competitive pricing, full material certification, and custom cutting to length.
Product Overview
Our carbon steel square bar is produced by hot rolling or cold drawing from quality billets. Hot-rolled square bar is ideal for structural and welding applications where surface finish is secondary. Cold-drawn square bar offers tighter tolerances, smoother surfaces, and improved straightness, making it suitable for precision machining and assembly. We can supply both black and peeled/polished finishes depending on your requirements.
Carbon Steel Square Bar Specifications
| Parameter | Range / Standard |
|---|---|
| Size | 6 × 6 mm to 200 × 200 mm |
| Length | 4–12 meters, or cut to length |
| Tolerance | ASTM A29, EN 10060, JIS G 3191, GB/T 702 |
| Surface | Black, peeled, polished, rough-turned |
| Edge condition | Sharp corner or controlled radius |
| Straightness | As per standard; improved straightness available |
| Weight | Calculated by theoretical weight; actual weight verified |
Available Grades
| Grade | Standard | Typical Uses |
|---|---|---|
| AISI 1018 / SAE 1018 | ASTM A29 | Machined parts, fixtures, low-stress components |
| AISI 1045 / SAE 1045 | ASTM A29 | Shafts, keys, gears, structural supports |
| S45C | JIS G 4051 | Machinery, automotive, general engineering |
| Q235B | GB/T 700 | Construction, welding, general fabrication |
| SS400 | JIS G 3101 | Structural frames, brackets, supports |
| St37-2 | DIN 17100 | European machinery and construction |
Manufacturing Standards
Carbon steel square bar is manufactured and tested according to recognized international standards. We can supply with ASTM A29, JIS G 3191, EN 10060, GB/T 702, and GB/T 1591 certificates. Chemical composition, mechanical properties, and dimensional tolerances are verified on each heat. Upon request, we provide EN 10204 3.1 or 3.2 inspection certificates and third-party inspection by SGS, BV, or TÜV.
Applications
- Machinery frames and base plates
- Fixtures, jigs, and tooling components
- Shafts, keys, and drive pins
- Structural bracing and supports
- Construction and architectural metalwork
- Welded assemblies and fabrications
- Automotive and agricultural equipment
Quality Assurance
Every square bar order is checked for chemical composition, tensile strength, yield strength, elongation, and dimensional accuracy. Surface quality is inspected for cracks, seams, scale, and excessive decarburization. We support pre-shipment inspection and factory audits to ensure the material matches your purchase order and project specification.
Packaging and Shipping
Bars are bundled with steel strapping, separated by soft separators to prevent surface damage, and loaded on wooden pallets or metal frames. For export, we apply anti-rust oil or VCI film to protect against sea-air moisture. Container loading is supervised, and we provide a packing list, mill test certificate, and bill of lading.
Why Buy Carbon Steel Square Bar from Huaxia-Steel?
- Direct mill pricing with no trader markup
- Wide range of sizes and grades in stock
- Cut-to-length service to reduce waste
- Full traceability and MTC documentation
- Fast quotation and reliable ocean shipping
Request a Quote
Tell us the size, grade, quantity, and delivery destination. Our team will respond with a factory-direct quotation, lead time, and shipping options for carbon steel square bar.
