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Hot Rolled 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 Hot Rolled Flat Steel
| Property | Parameter | Description |
|---|---|---|
| Product Name | Hot Rolled Flat Steel | Industrial-grade hot rolled flat steel bar for structural and fabrication use |
| Material Grade | Q235B / SS400 / A36 / S235JR | Equivalent grades across GB, JIS, ASTM, and EN standards |
| Standard Compliance | GB/T 702, ASTM A36, EN 10058, JIS G3194 | Conforms to international flat steel product standards |
| Carbon Content (C) | ≤ 0.20% | Ensures good weldability and formability |
| Manganese Content (Mn) | 0.30% – 1.40% | Enhances strength and hardness |
| Silicon Content (Si) | ≤ 0.35% | Acts as deoxidizer during steelmaking |
| Phosphorus Content (P) | ≤ 0.045% | Controlled to prevent cold brittleness |
| Sulfur Content (S) | ≤ 0.045% | Controlled to prevent hot shortness |
| Tensile Strength | 370 – 500 MPa | Per ASTM A36 / GB/T 700 standard requirements |
| Yield Strength | ≥ 235 MPa | Minimum yield point for structural applications |
| Elongation | ≥ 26% | Measured on standard gauge length specimen (A5) |
| Thickness Range | 3 – 60 mm | Customizable within standard production range |
| Width Range | 20 – 200 mm | Available in multiple width specifications |
| Length Range | 6,000 – 12,000 mm | Standard lengths; cut-to-length service available |
| Surface Finish | Black / Pickled & Oiled | Mill finish with oxide scale or cleaned surface options |
| Application | Construction, machinery, bridges, vehicles, shipbuilding | Widely used in structural frameworks and general fabrication |
| Certification | ISO 9001, SGS, Mill Test Certificate (EN 10204 3.1) | Third-party inspection and quality assurance available |
| Packaging | Bundled with steel strips, waterproof paper wrapped | Seaworthy packaging suitable for export shipment |
Hot Rolled Flat Steel - ASTM Certified Mill Direct Manufacturer
Hot rolled flat steel is one of the most versatile and widely demanded semi-finished steel products in global construction, manufacturing, and infrastructure sectors. Produced by rolling heated steel slabs at temperatures exceeding 1,700°F (926°C), this product delivers exceptional formability, consistent mechanical properties, and cost-effective performance across a broad range of structural and industrial applications. As a mill-direct manufacturer with ASTM-certified production lines, we supply premium-grade hot rolled flat steel in a comprehensive range of dimensions, grades, and custom specifications — ensuring reliable delivery and competitive mill-direct rates for projects of every scale.
What is Hot Rolled Flat Steel?
Hot rolled flat steel refers to flat-profile steel sections produced through the hot rolling process, where steel billets or slabs are heated above their recrystallization temperature and passed through a series of rolling mills to achieve the desired thickness and width. The resulting product features a characteristic dark oxide scale surface, slightly rounded edges, and a favorable grain structure that provides superior weldability and ductility. It serves critical roles as base material for fabrication, machinery parts, trailer frames, brackets, supports, and general structural components where tight dimensional tolerances are not the primary requirement.
Hot Rolled Flat Steel Technical Specifications
Our hot rolled flat steel is manufactured in strict compliance with international standards, including ASTM A36, ASTM A1011, EN 10058, and GB/T 702, ensuring consistent quality and traceability for every shipment. Below are our standard production parameters:
- Steel Grades: A36, SS400, Q235B, Q345B, S235JR, S355JR
- Thickness Range: 3 mm – 60 mm
- Width Range: 20 mm – 200 mm
- Length: 6 m, 9 m, 12 m, or cut-to-length per customer specification
- Yield Strength: 250 MPa minimum (A36), 345 MPa minimum (Q345B)
- Tensile Strength: 400–550 MPa (grade-dependent, per ASTM A36)
- Elongation: ≥ 20% (for 200 mm gauge length)
- Surface Finish: Black oxide (mill finish), pickled and oiled available on request
- Density: 7.85 g/cm³ at 20°C
- Tolerances: Compliant with ASTM A29/A29M dimensional standards
Custom chemical compositions, mechanical testing certificates (MTC per EN 10204 3.1), and third-party inspection arrangements are available to meet project-specific procurement requirements.
Key Applications of Hot Rolled Flat Steel
Thanks to its excellent machinability and cost-effective production economics, hot rolled flat steel finds extensive application across diverse industries:
- Construction & Structural: Base plates, gusset plates, bracing elements, and connection hardware
- Manufacturing: Machine frames, jigs, fixtures, and general fabrication stock
- Transportation: Trailer beds, truck chassis reinforcements, and railcar components
- Agricultural Equipment: Plow blades, implement frames, and wear-resistant brackets
- Energy & Infrastructure: Transmission tower fittings, pipeline supports, and solar mounting structures
Get a Competitive Quote for Hot Rolled Flat Steel
As a certified mill-direct supplier, we eliminate middleman costs to deliver premium hot rolled flat steel at the most competitive pricing in the market. Whether you require standard stock sizes or fully customized dimensions, our technical team is ready to support your procurement needs.
- 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
