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High Strength Flat Steel - 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 High Strength Flat Steel
| Property | Parameter | Description |
|---|---|---|
| Product Name | High Strength Flat Steel | Hot-rolled high strength structural flat steel bar |
| Material Grade | Q460 / S460 / ASTM A572 Gr.50 | Equivalent grades: EN S460N, JIS SM490, GB/T Q460C |
| Standard Compliance | ASTM A572, EN 10025-3, GB/T 1591 | International structural steel standards for high strength applications |
| Carbon (C) | ≤ 0.20% | Controlled carbon content for weldability and toughness |
| Manganese (Mn) | ≤ 1.70% | Enhances strength and hardenability |
| Silicon (Si) | ≤ 0.60% | Deoxidizer improving strength |
| Phosphorus (P) | ≤ 0.025% | Restricted to ensure ductility and toughness |
| Sulfur (S) | ≤ 0.020% | Low sulfur for improved impact resistance |
| Vanadium (V) / Niobium (Nb) | V ≤ 0.20% / Nb ≤ 0.05% | Micro-alloying elements for grain refinement and precipitation strengthening |
| Tensile Strength | 550 - 720 MPa | Per ASTM A572 Gr.50 / EN 10025-3 S460N requirements |
| Yield Strength | ≥ 460 MPa | Minimum yield point ensuring structural load-bearing capacity |
| Elongation | ≥ 17% | Measured on gauge length of 200 mm per standard test methods |
| Thickness Range | 5 - 80 mm | Customizable thickness to meet project specifications |
| Width Range | 40 - 600 mm | Standard and custom widths available |
| Length Range | 6,000 - 12,000 mm | Cut-to-length service available upon request |
| Surface Finish | Hot-rolled / Shot-blasted / Painted | Optional anti-corrosion primer coating (SA 2.5 blast cleaning) |
| Application | Bridges, buildings, heavy machinery, crane booms, offshore structures | Ideal for load-bearing components requiring high strength-to-weight ratio |
| Certification | ISO 9001, EN 10204 3.1 MTC, SGS, BV | Mill test certificate provided with each shipment |
| Packaging | Bundled with steel strips, waterproof paper wrapped | Seaworthy export packaging with identification tags |
| MOQ | 5 Metric Tons | Smaller quantities negotiable for trial orders |
High Strength Flat Steel - ASTM Certified Mill Direct Supplier
High strength flat steel serves critical roles in modern structural engineering, heavy machinery manufacturing, and infrastructure construction where superior load-bearing capacity and dimensional precision are non-negotiable. As a mill-direct supplier with ASTM-certified production lines, we deliver premium grade flat steel products engineered to meet the most demanding mechanical requirements across industries including bridge construction, automotive chassis fabrication, mining equipment, and high-rise building frameworks. Our high strength flat steel inventory covers a comprehensive range of grades, dimensions, and surface finishes — all backed by full mill test certificates and third-party inspection reports to ensure consistent quality and complete traceability from melt to delivery.
What is High Strength Flat Steel?
High strength flat steel is a hot-rolled or cold-finished steel product with a rectangular cross-section, manufactured from low-alloy or micro-alloyed steel grades that deliver significantly elevated yield strength and tensile strength compared to standard mild steel. Typical grades include ASTM A572 Grade 50, S355J2, and Q460C, offering minimum yield strengths ranging from 345 MPa to 460 MPa. This flat steel profile combines structural rigidity with efficient material usage, allowing engineers to reduce overall component weight by 15%–30% without compromising load performance — a decisive advantage in weight-sensitive applications such as crane booms, trailer frames, and offshore platform decking.
High Strength Flat Steel Technical Specifications
Our high strength flat steel products are manufactured in strict compliance with ASTM A572/A572M, EN 10025-2, and GB/T 1591 standards. Below are the key parameters available from our production facility:
- Thickness range: 3 mm – 80 mm
- Width range: 20 mm – 500 mm
- Length: 6 m, 9 m, 12 m, or custom cut-to-length
- Yield strength: 345 MPa – 690 MPa (grade dependent)
- Tensile strength: 470 MPa – 830 MPa minimum per applicable standard
- Elongation: ≥16% (A572 Gr.50, 200 mm gauge length)
- Surface finish: Black, shot-blasted (Sa 2.5), or primed
- Tolerances: EN 10058 or ASTM A484 dimensional tolerances
- Impact toughness: 27 J minimum at -20°C for S355J2 grade
Each shipment is accompanied by EN 10204 Type 3.1 mill test certificates documenting chemical composition, mechanical properties, and dimensional inspection results. Common alloying elements include manganese (1.0%–1.65%), silicon (0.15%–0.55%), and micro-additions of vanadium (≤0.15%) or niobium (≤0.05%) to achieve grain refinement and precipitation strengthening.
Applications of High Strength Flat Steel
This versatile flat steel product finds extensive application in sectors requiring exceptional strength-to-weight ratios and reliable weldability. Key use cases include structural columns and beams in commercial buildings, leaf spring blanks for heavy-duty vehicles, conveyor frame components in mining operations, and base plates for wind turbine tower foundations. The controlled carbon equivalent (CE ≤ 0.45) of our flat steel ensures excellent field weldability without mandatory pre-heat requirements, reducing fabrication time and labor costs for downstream manufacturers.
Get a Competitive Quote for High Strength Flat Steel
Partner with a mill-direct supplier committed to delivering certified high strength flat steel at cost-effective rates with reliable lead times. Whether you require standard stock dimensions or custom-rolled profiles, our technical team is ready to support your project from specification to shipment.
- 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
