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Q235 Flat Steel - GB Standard Mill Direct Factory 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 Q235 Flat Steel
| Property | Parameter | Description |
|---|---|---|
| Product Name | Q235 Flat Steel | Hot rolled flat steel bar made from Q235 carbon structural steel |
| Material Grade | Q235 (Q235A / Q235B) | Equivalent to ASTM A36, EN S235JR, JIS SS400 |
| Standard Compliance | GB/T 702, GB/T 700 | Also meets ASTM A36/A36M, EN 10058, JIS G3194 |
| Carbon (C) | ≤ 0.22% | Per GB/T 700 for Q235B grade |
| Manganese (Mn) | 0.30% – 0.70% | Ensures adequate strength and toughness |
| Silicon (Si) | ≤ 0.35% | Deoxidizer element per standard specification |
| Phosphorus (P) | ≤ 0.045% | Controlled to maintain weldability |
| Sulfur (S) | ≤ 0.045% | Controlled to prevent hot shortness |
| Tensile Strength | 370 – 500 MPa | Per GB/T 700 standard requirement |
| Yield Strength | ≥ 235 MPa (t ≤ 16 mm) | Decreases with increasing thickness per GB/T 700 |
| Elongation | ≥ 26% | Measured on gauge length of 5.65√So |
| Thickness Range | 3 mm – 60 mm | Custom thickness available upon request |
| Width Range | 10 mm – 200 mm | Standard and non-standard widths supplied |
| Length Range | 6 m – 12 m | Cut-to-length service available |
| Surface Finish | Hot Rolled / Pickled / Galvanized | Mill scale surface or cleaned finish per customer requirement |
| Application | Construction, machinery, bridges, frameworks | Widely used in structural fabrication, fencing, and general engineering |
| Certification | ISO 9001, SGS, Mill Test Certificate (EN 10204 3.1) | Third-party inspection available on request |
| Packaging | Bundled with steel strips, waterproof paper wrapped | Seaworthy export packaging with tags and markings |
Q235 Flat Steel - GB Standard Mill Direct Factory Supplier
Q235 flat steel is one of the most widely consumed structural steel profiles in construction, manufacturing, and general fabrication across global markets. Defined under the Chinese national standard GB/T 700, Q235 grade represents a reliable carbon structural steel with a minimum yield strength of 235 MPa, making it the go-to material for cost-effective structural applications. As a mill-direct factory supplier, we deliver premium-grade Q235 flat steel bars with full mill test certificates (MTC), consistent dimensional accuracy, and competitive pricing tailored for both domestic and international buyers. Whether you require standard stock sizes or custom-cut lengths, our production capacity and quality management system ensure every shipment meets your project specifications on time.
What Is Q235 Flat Steel?
Q235 flat steel is a hot-rolled, rectangular cross-section steel bar produced from Q235 grade low-carbon structural steel per GB/T 700 and GB/T 702 standards. The "Q" designates yield point (屈服点), while "235" indicates a minimum yield strength of 235 MPa for thickness ≤16 mm. This flat bar product serves critical roles in steel structure fabrication, frame construction, machinery bases, bridge components, fence railings, and general welding applications. Its excellent weldability, reliable formability, and cost-effective nature make Q235 flat steel a foundational material across the construction and manufacturing industries.
Q235 Flat Steel Technical Specifications
Understanding precise technical parameters is essential when specifying Q235 flat bar for your project. Below are the key data points conforming to Chinese GB standards:
- Standard: GB/T 700 (material grade), GB/T 702 (flat steel dimensions)
- Chemical Composition: C ≤ 0.22%, Mn ≤ 1.40%, Si ≤ 0.35%, S ≤ 0.045%, P ≤ 0.045%
- Yield Strength: ≥235 MPa (thickness ≤16 mm), ≥225 MPa (16–40 mm), ≥215 MPa (40–60 mm)
- Tensile Strength: 370–500 MPa
- Elongation (A₅): ≥26% (guaranteeing reliable ductility)
- Density: 7.85 g/cm³ at 20°C
- Width Range: 10 mm – 200 mm
- Thickness Range: 3 mm – 60 mm
- Length: 6 m, 9 m, 12 m standard, or cut-to-length per request
- Surface Finish: Hot-rolled mill finish, pickled and oiled available on request
Q235 flat steel is equivalent or comparable to international grades including SS400 (JIS G3101), S235JR (EN 10025), A36 (ASTM A36), and RSt37-2 (DIN 17100), enabling seamless cross-standard substitution for export projects.
Key Advantages of Q235 Flat Steel Bars
Choosing Q235 grade flat steel provides several measurable benefits. Its low carbon content (≤0.22%) delivers superior weldability without preheating requirements, reducing fabrication time and labor costs. The balanced manganese content ensures adequate strength-to-weight performance for load-bearing structures while maintaining excellent cold bending capability — Q235B grade passes 180° cold bend tests at d=a (where a equals specimen thickness). Additionally, mill-direct sourcing eliminates intermediary markups, offering cost-effective procurement with full traceability from steelmaking through final delivery.
Get a Competitive Quote for Q235 Flat Steel
Partner with our factory for reliable Q235 flat steel supply at mill-direct rates. We support MOQ flexibility from single bundles to full container loads, with export-standard packaging including bundling, anti-rust coating, and steel strip reinforcement for safe ocean freight.
- 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
