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Flat Steel for Construction - 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 Flat Steel for Construction
| Property | Parameter | Description |
|---|---|---|
| Product Name | Flat Steel for Construction | Hot-rolled or cold-drawn flat bar used in structural and civil engineering applications |
| Material Grade | S235JR / S275JR / S355JR / S355J2 (EN); A36 / A572 Gr.50 (ASTM); Q235B / Q345B (GB); SS400 / SM490 (JIS) | International equivalent grades available upon request; dual-certified material supported |
| Standard Compliance | EN 10025-2, ASTM A36 / A572, GB/T 700 / GB/T 1591, JIS G3101 / G3106 | Full mill test reports (MTR) traceable to applicable standards provided with each shipment |
| Chemical Composition – C | ≤ 0.20% (S235JR); ≤ 0.22% (S355JR) | Carbon content controlled to ensure weldability and structural integrity |
| Chemical Composition – Mn / Si / P / S | Mn ≤ 1.60%; Si ≤ 0.55%; P ≤ 0.035%; S ≤ 0.035% | Balanced alloy composition per EN 10025-2 / ASTM A36 requirements |
| Tensile Strength | 360–510 MPa (S235JR); 470–630 MPa (S355JR); 400–550 MPa (A36) | Tested per EN ISO 6892-1 or ASTM E8/E8M; values vary by grade and thickness |
| Yield Strength | ≥ 235 MPa (S235JR); ≥ 355 MPa (S355JR); ≥ 250 MPa (A36, t ≤ 20 mm) | Minimum yield strength guaranteed; ReH values decrease with increasing thickness |
| Elongation | ≥ 26% (S235JR, L0=5.65√S0); ≥ 22% (S355JR); ≥ 20% (A36) | Longitudinal tensile test; adequate ductility for bending, welding, and forming operations |
| Thickness Range | 3 mm – 100 mm | Standard thickness increments: 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 40, 50, 60, 80, 100 mm |
| Width Range | 20 mm – 400 mm | Common widths: 20, 25, 30, 40, 50, 60, 75, 80, 100, 120, 150, 200, 250, 300, 400 mm |
| Length | 3,000 mm – 12,000 mm (standard); custom cut-to-length available | Random or fixed length; tolerance per EN 10279 or customer specification |
| Surface Finish | Hot-rolled (black scale); pickled and oiled (P&O); shot-blasted Sa 2.5; primed | Surface condition selected based on downstream fabrication or corrosion protection requirements |
| Dimensional Tolerance | Width: ±0.5–1.5 mm; Thickness: ±0.3–1.0 mm; Length: +50/−0 mm | Per EN 10279 Class A/B or ASTM A6/A6M; tighter tolerances available on request |
| Application | Structural frames, bridges, machinery bases, brackets, grating supports, reinforcement, formwork | Widely used in civil construction, industrial fabrication, infrastructure, and general engineering |
| Certification | ISO 9001:2015; CE Marking (EN 1090-1); Lloyd's / BV / DNV / ABS mill approval available | Third-party inspection (SGS, Intertek, BV) and EN 10204 3.1 / 3.2 MTR supported |
| Packaging | Bundled with steel strapping (≤ 3,000 kg/bundle); wooden dunnage; seaworthy export packing | Rust-preventive oil coating applied for sea freight; labeling per customer or standard requirement |
| MOQ | 5 metric tons per grade/size combination | Mixed container loading accepted; spot stock available for standard sizes with shorter lead time |
Flat Steel for Construction - Mill Direct Supplier
Flat steel for construction serves as one of the most foundational structural materials in modern civil engineering and building projects worldwide. Characterized by its rectangular cross-section and uniform thickness, this product delivers exceptional load-bearing performance across a broad range of structural applications — from reinforced concrete frameworks to industrial facility fabrication. As a mill-direct supplier, we offer flat steel bars and plates manufactured to precise dimensional tolerances, ensuring consistent mechanical properties throughout every batch. Our products comply with internationally recognized standards including ASTM A36, EN 10025, and GB/T 700, making them suitable for projects demanding rigorous quality documentation. Whether your project involves high-rise residential buildings, bridge decks, heavy machinery bases, or prefabricated steel structures, our flat steel solutions are engineered to meet the specific load, weldability, and durability requirements your application demands — all delivered at cost-effective mill-direct rates with full material traceability.
What is Flat Steel for Construction?
Flat steel for construction refers to hot-rolled or cold-drawn steel products with a flat, rectangular cross-section, typically ranging from 10 mm to 500 mm in width and 3 mm to 100 mm in thickness. It finds extensive application in structural frameworks, support beams, grating fabrication, and anchor plate assemblies. Produced from low-carbon or low-alloy steel grades, it balances strength, ductility, and weldability for demanding construction environments.
Flat Steel for Construction Technical Specifications
Our flat steel for construction is available in the following verified technical parameters to support precise engineering and procurement decisions:
| Parameter | Specification |
|---|---|
| Material Grade | A36, S235JR, S355JR, Q235B, Q355B |
| Width Range | 10 mm – 500 mm |
| Thickness Range | 3 mm – 100 mm |
| Tensile Strength | 400 – 550 MPa (grade dependent) |
| Yield Strength | ≥ 235 MPa (Q235B) / ≥ 355 MPa (Q355B) |
| Density | 7.85 g/cm³ at 20°C |
| Surface Finish | Hot-rolled black, pickled, or galvanized |
| Standard Compliance | ASTM A36, EN 10025-2, GB/T 700 |
| Length | 6 m standard / custom cut-to-length available |
Get a Competitive Quote for Flat Steel for Construction
Partner with a trusted mill-direct source for your flat steel for construction requirements. We provide rapid quotations, certified mill test reports, and flexible logistics solutions tailored to project timelines — ensuring your procurement process stays efficient and cost-controlled.
- 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
