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Flat Steel - ASTM Certified Mill Direct Manufacturer |
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
| Property | Parameter | Description |
|---|---|---|
| Product Name | Flat Steel | Hot-rolled or cold-drawn flat steel bar with rectangular cross-section |
| Material Grade | S235JR / S355JR / A36 / Q235 / Q345 | EN 10025 equivalent: S235JR≈A36≈Q235; S355JR≈A572 Gr.50≈Q345 |
| Standard Compliance | EN 10058 / ASTM A36 / JIS G3194 / GB/T 702 | Dimensional and mechanical property standards for hot-rolled flat steel bars |
| Chemical Composition (C) | ≤ 0.20% (S235JR) / ≤ 0.24% (S355JR) | Carbon content controlling weldability and hardness |
| Chemical Composition (Mn) | ≤ 1.50% (S355JR) / ≤ 1.40% (S235JR) | Manganese enhances tensile strength and toughness |
| Chemical Composition (P/S) | P ≤ 0.035% / S ≤ 0.035% | Phosphorus and sulfur limits per EN 10025-2 for structural quality |
| Tensile Strength | 360–510 MPa (S235JR) / 470–630 MPa (S355JR) | Per EN 10025-2; ASTM A36: 400–550 MPa |
| Yield Strength | ≥ 235 MPa (S235JR) / ≥ 355 MPa (S355JR) | Minimum yield strength for thickness ≤ 16 mm per EN 10025-2 |
| Elongation | ≥ 26% (S235JR) / ≥ 22% (S355JR) | Minimum elongation at fracture (A80mm) per EN 10025-2 |
| Thickness Range | 3 mm – 100 mm | Standard hot-rolled flat bar thickness per EN 10058 / GB/T 702 |
| Width Range | 10 mm – 400 mm | Available widths; custom widths available upon request |
| Length | 3,000 mm – 12,000 mm (standard) / cut-to-length available | Fixed or random lengths; tolerance per EN 10058 Class A/B |
| Surface Finish | Hot-rolled (black) / Pickled & Oiled / Cold-drawn (bright) | HR surface with mill scale; P&O for improved corrosion resistance; CD for tight tolerance |
| Dimensional Tolerance | Width: ±0.5–2.0 mm / Thickness: ±0.3–1.5 mm | Per EN 10058 normal tolerance class; tighter tolerance available for cold-drawn |
| Application | Structural fabrication, machinery parts, construction, brackets, frames, conveyor systems | Widely used in civil engineering, manufacturing, and general metalwork |
| Certification | Mill Test Certificate (EN 10204 3.1 / 3.2), ISO 9001:2015 | Third-party inspection available; CE marking for structural applications |
| Packaging | Bundled with steel strapping, wooden dunnage, waterproof paper wrapping | Bundle weight: 1–3 MT; seaworthy export packing available |
| MOQ | 1 MT (stock items) / 5 MT (custom orders) | Mixed grades and sizes accepted for stock orders |
Flat Steel - ASTM Certified Mill Direct Manufacturer
Flat steel stands as one of the most versatile and structurally essential steel products in modern industrial manufacturing, construction, and fabrication. Produced through precision hot-rolling or cold-rolling processes, flat steel delivers consistent dimensional accuracy, superior surface finish, and reliable mechanical performance across demanding applications. From heavy structural frameworks and bridge components to automotive chassis, shipbuilding, and machinery fabrication, flat steel serves critical roles wherever strength, formability, and dimensional stability are required. As an ASTM-certified mill direct manufacturer, we supply flat steel products that meet rigorous international standards including ASTM A36, ASTM A572, and ASTM A516, ensuring every shipment delivers the performance your project demands. Our vertically integrated production capability allows us to offer mill-direct rates without intermediary markups, providing measurable cost advantages for procurement teams managing large-volume or long-term supply requirements. Whether you require standard stock dimensions or custom-cut specifications, our technical team is ready to support your sourcing needs from inquiry through delivery.
What is Flat Steel?
Flat steel refers to a category of rolled steel products characterized by a rectangular cross-section with a width significantly greater than its thickness. It encompasses flat bars, steel plates, sheet steel, and strip steel, manufactured from carbon steel, alloy steel, or high-strength low-alloy (HSLA) steel grades. Flat steel finds extensive application in structural fabrication, pressure vessel manufacturing, transportation equipment, and general engineering construction worldwide.
Flat Steel Technical Specifications
Our flat steel products are manufactured to precise dimensional and mechanical standards to ensure compliance with project specifications:
- Width range: 20 mm – 600 mm; Thickness range: 3 mm – 100 mm
- Yield strength: 250 MPa minimum (ASTM A36) up to 690 MPa (ASTM A514 high-strength grade)
- Tensile strength: 400 MPa – 760 MPa depending on grade and heat treatment
- Density: 7.85 g/cm³ at 20°C (carbon steel grades)
- Surface condition: Hot-rolled black, pickled and oiled (P&O), or cold-rolled bright finish
- Length: Standard 6 m / 12 m or custom cut-to-length per order
- Standards: ASTM A36, A572 Gr.50, A516 Gr.70, EN 10025 S235/S355, GB/T 700 Q235/Q345
- Mill test certificates: Provided with every shipment, third-party inspection available upon request
All flat steel products undergo ultrasonic testing, dimensional inspection, and mechanical property verification before dispatch, ensuring full traceability from melt heat to final product.
Get a Competitive Quote for Flat Steel
Partner with a trusted ASTM-certified flat steel manufacturer offering mill-direct pricing, reliable lead times, and dedicated technical support. Our global logistics network ensures on-time delivery to ports worldwide, with flexible packaging options for sea, rail, or road freight. Contact our sales team today to discuss your specifications and volume requirements.
- 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
