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Steel Flat Bar - ASTM Certified Mill Direct Supplier |
China
Supplier's customization ability
- Drawing-based customization
- Sample-based customization
- Full customization
Minimum order quantity: 1 ton
Shipping total: To be negotiated
- Lead time:
- confirmed with the quotation
- Packaging:
- standard export packing
- Samples:
- available on request
Product details
Technical Specifications of Steel Flat Bar
| Property | Parameter | Description |
|---|---|---|
| Product Name | Steel Flat Bar | Hot rolled or cold drawn flat bar in carbon, alloy, and stainless steel grades |
| Material Grade | A36 / S235JR / SS400 / Q235B / 1018 / 1045 / 304 / 316 | International equivalents: A36 ≈ S235JR ≈ SS400 ≈ Q235B; 1045 ≈ S45C ≈ C45; 304 ≈ 1.4301 ≈ SUS304 |
| Standard Compliance | ASTM A36 / EN 10058 / JIS G3194 / GB/T 702 | Covers dimensional tolerances, mechanical properties, and chemical composition requirements for flat bars |
| Chemical Composition (C) | ≤ 0.26% (A36) / ≤ 0.17% (S235JR) | Carbon content controls hardness and weldability; lower C improves weldability |
| Chemical Composition (Mn) | ≤ 1.20% (A36) / ≤ 1.40% (S235JR) | Manganese enhances strength and hardenability |
| Chemical Composition (P / S) | P ≤ 0.04% / S ≤ 0.05% | Phosphorus and sulfur are impurity elements; lower values improve toughness and ductility |
| Chemical Composition (Si) | ≤ 0.40% (A36) / ≤ 0.05% (S235JR) | Silicon acts as a deoxidizer and improves strength |
| Tensile Strength | 400–550 MPa (A36 / S235JR) / 585–760 MPa (1045) | Per ASTM A36 and EN 10025-2; higher grades available for structural and mechanical applications |
| Yield Strength | ≥ 250 MPa (A36) / ≥ 235 MPa (S235JR) / ≥ 375 MPa (1045) | Minimum yield strength per respective standards; varies with thickness range |
| Elongation | ≥ 20% (A36, 200 mm gauge) / ≥ 26% (S235JR) | Indicates ductility; tested per ASTM E8 or EN ISO 6892-1 |
| Thickness Range | 3 mm – 100 mm | Common stock thicknesses: 3, 5, 6, 8, 10, 12, 16, 20, 25, 30, 40, 50 mm per EN 10058 / GB/T 702 |
| Width Range | 10 mm – 400 mm | Standard widths: 20, 25, 30, 40, 50, 60, 75, 100, 150, 200 mm; custom widths available |
| Length | 3,000 mm – 12,000 mm (standard) / Custom cut-to-length | Random mill lengths or fixed lengths; tolerance per EN 10058: +100 mm / 0 mm |
| Surface Finish | Hot Rolled (HR) / Cold Drawn (CD) / Pickled & Oiled (P&O) / Galvanized | HR: mill scale surface; CD: smooth, tight tolerance; P&O: scale-free; Galvanized: corrosion-resistant coating |
| Application | Structural fabrication, machinery frames, brackets, supports, conveyor systems, construction, shipbuilding | Widely used in manufacturing, civil engineering, and industrial equipment due to versatile dimensions and grades |
| Certification | Mill Test Certificate (MTC) per EN 10204 3.1 / 3.2; ISO 9001:2015; CE Marking | Third-party inspection available (SGS, BV, TÜV); heat and lot number traceability provided |
| Packaging | Bundled with steel strapping (max 2,000 kg per bundle); wooden dunnage; seaworthy export packing available | Bundles labeled with grade, heat number, dimensions, and weight; moisture-proof wrapping on request |
| MOQ | 1 Metric Ton (MT) | Mixed grades and sizes accepted per order; stock items available for immediate shipment |
Steel Flat Bar - ASTM Certified Mill Direct Supplier
Steel flat bar serves as one of the most versatile structural components in modern construction, manufacturing, and fabrication industries. As an ASTM certified mill direct supplier, we provide premium grade flat bars engineered to meet the most demanding project specifications. Our steel flat bars are manufactured under rigorous quality control protocols, ensuring dimensional accuracy, consistent mechanical properties, and reliable performance across a wide range of applications. From structural frameworks and machine bases to brackets, supports, and architectural elements, our flat bar stock finds extensive application in sectors including civil engineering, automotive manufacturing, shipbuilding, and industrial equipment fabrication. With mill-direct pricing and a comprehensive inventory spanning multiple grades, widths, and thicknesses, we deliver cost-effective solutions without compromising on material integrity. Whether you require standard carbon steel, high-strength low-alloy (HSLA), or stainless variants, our technical team is ready to match the ideal flat bar specification to your exact project requirements.
What is Steel Flat Bar?
A steel flat bar is a long, rectangular solid steel section characterized by a flat, uniform cross-section with defined width and thickness dimensions. Produced through hot rolling or cold drawing processes, flat bars differ from plates and sheets primarily in their narrower width-to-thickness ratio and suitability for direct structural or fabrication use. They serve critical roles as load-bearing members, mounting brackets, reinforcement strips, and frame components across industrial and commercial applications.
Steel Flat Bar Technical Specifications
Our steel flat bars are produced in conformance with ASTM A36, ASTM A572 Grade 50, and EN 10025 standards. Standard widths range from 12 mm to 500 mm, with thicknesses spanning 3 mm to 100 mm and lengths available up to 12 meters. Mechanical properties include a minimum yield strength of 250 MPa for A36 grade and 345 MPa for A572 Grade 50, with tensile strength reaching 400–550 MPa. Surface finishes include hot-rolled, cold-finished, and pickled-and-oiled options to suit downstream processing needs.
| Parameter | Specification |
|---|---|
| Standard | ASTM A36 / A572 Gr.50 / EN 10025 |
| Width Range | 12 mm – 500 mm |
| Thickness Range | 3 mm – 100 mm |
| Length | Up to 12,000 mm (custom cut available) |
| Yield Strength (A36) | ≥ 250 MPa |
| Tensile Strength | 400 – 550 MPa |
| Density | 7.85 g/cm³ at 20°C |
| Surface Finish | Hot-rolled / Cold-finished / Pickled & Oiled |
Get a Competitive Quote for Steel Flat Bar
Partner with a trusted ASTM certified mill direct supplier and benefit from transparent mill-direct rates, fast lead times, and dedicated technical consultation. Whether your order is a small trial batch or a large-scale project requirement, we tailor our supply solution to your timeline and budget. Reach out now for a no-obligation quote.
- 24/7 customer support available
- Free samples for quality evaluation
- Competitive pricing for bulk orders
- Professional technical consultation
Contact us today to get your free quote within 24 hours!
Ratings & Reviews
Know your supplier
Product Introduction
Hongji Profiles Co., Ltd. is a professional manufacturer and supplier specializing in the R&D, production and sales of high-quality steel profiles. With years of experience in the metallurgical industry, we have earned a solid reputation for reliability, precision and customer-centric service, providing global clients with premium steel profile solutions for diverse industrial and architectural needs.
Our core business covers a full range of steel profiles, including angle steel, channel steel, I-beams, H-beams, C-section steel, Z-section steel, flat steel and custom special steel profiles. These products are widely applied in building structures, bridges, transmission towers, industrial machinery, automotive components and shipping. We strictly control material selection, adopting high-quality steel grades such as S235JR, S355JR, SS400, A36 and Q355 series to ensure excellent mechanical properties, durability and corrosion resistance.
Guided by a customer-first philosophy, we have built a comprehensive sales and after-sales network. Our products are exported to Europe, North America, Southeast Asia and Africa, with long-term cooperation with well-known enterprises. Our team provides one-stop services, and we ensure prompt delivery through sufficient inventory and optimized logistics.
Upholding “Quality First, Integrity-based, Innovation-driven, Win-Win Cooperation”, Hongji is committed to becoming a global leader in the steel profile industry, continuously improving quality and service to create a better future with global customers.
FAQ
Supplier's customization ability
- Drawing-based customization
- Sample-based customization
- Full customization
Minimum order quantity: 1 ton
Shipping total: To be negotiated
- Lead time:
- confirmed with the quotation
- Packaging:
- standard export packing
- Samples:
- available on request
