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Square Steel Manufacturer - Mill Direct Factory Price | ASTM
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 Square Steel
| Property | Parameter | Description |
|---|---|---|
| Product Name | Square Steel Bar / Square Steel Billet | Hot-rolled or cold-drawn solid square steel sections |
| Material Grade | Q235B / SS400 / A36 / S235JR / Q345B / S355JR | Equivalent grades: ASTM A36, EN 10025 S235JR/S355JR, JIS SS400, GB/T 700 Q235B |
| Standard Compliance | ASTM A36/A615, EN 10025, JIS G3101, GB/T 700, GB/T 1591 | International and Chinese national standards for structural square steel |
| Carbon Content (C) | ≤ 0.20% (Q235B) / ≤ 0.26% (A36) | Controlled carbon for weldability and formability |
| Manganese Content (Mn) | 0.30% – 1.60% | Varies by grade; enhances strength and toughness |
| Silicon Content (Si) | ≤ 0.35% | Deoxidizer; improves strength |
| Phosphorus & Sulfur (P/S) | P ≤ 0.045%, S ≤ 0.045% | Restricted to ensure ductility and weldability |
| Tensile Strength | 370 – 630 MPa | Q235B: 370–500 MPa; Q345B: 470–630 MPa per GB/T 700 & GB/T 1591 |
| Yield Strength | 235 – 355 MPa | Q235B: ≥ 235 MPa; Q345B: ≥ 345 MPa (thickness ≤ 16 mm) |
| Elongation | ≥ 20% – 26% | Q235B: ≥ 26%; Q345B: ≥ 20% (gauge length 5.65√So) |
| Size Range | 8 mm × 8 mm – 250 mm × 250 mm | Side length customizable; length 6 m, 9 m, 12 m or as required |
| Dimensional Tolerance | Side: ±0.5 – ±2.0 mm; Length: +50 / 0 mm | Per GB/T 702 or ASTM A6/A6M tolerance standards |
| Surface Finish | Black (hot-rolled) / Bright (cold-drawn) / Peeled / Polished | Optional anti-rust oil coating or galvanized finish |
| Processing Method | Hot-rolled / Cold-drawn / Forged | Hot-rolled for standard sizes; cold-drawn for precision applications |
| Application | Construction, machinery, automotive, shipbuilding, bridges | Structural frameworks, shafts, supports, and general fabrication |
| Certification | ISO 9001, SGS, BV, Mill Test Certificate (EN 10204 3.1) | Third-party inspection and material traceability available |
| Packaging | Bundled with steel strips, waterproof paper or woven cloth wrap | Seaworthy packaging; tagged with heat number and grade |
| MOQ | 5 Metric Tons | Smaller quantities negotiable for special grades or sizes |
Square Steel Manufacturer - Mill Direct Factory Price | ASTM
Choosing the right square steel manufacturer is a critical decision that directly impacts project quality, budget efficiency, and long-term structural performance. As global infrastructure development accelerates, demand for precision-engineered square steel bars and billets continues to surge across construction, mechanical engineering, and industrial fabrication sectors. A reliable square steel manufacturer offers more than just raw material — they deliver consistent metallurgical quality, dimensional accuracy within tight tolerances, and supply chain dependability that keeps your projects on schedule. Whether you require hot-rolled square bars for structural frameworks, cold-drawn square steel for precision machining, or forged square billets for heavy-duty applications, partnering with a mill-direct factory ensures you receive premium-grade products at cost-effective pricing. Our facility integrates advanced continuous casting, controlled rolling, and rigorous in-line inspection systems to produce square steel that meets ASTM A36, ASTM A615, ASTM A276, and GB/T 702 standards. With annual production capacity exceeding 500,000 metric tons and export experience spanning over 60 countries, we stand as your trusted square steel supplier committed to engineering excellence and customer satisfaction.
What is Square Steel?
Square steel refers to solid steel bars or billets with a square cross-section, manufactured through hot rolling, cold drawing, or forging processes. Unlike hollow square tubes, solid square steel delivers superior load-bearing capacity and machinability. It finds extensive application in structural columns, machine shafts, axle blanks, anchor bolts, and general fabrication components. Available in carbon steel grades (Q235, Q345, AISI 1045), alloy steel grades (4140, 4340), and stainless steel grades (304, 316), square steel serves critical roles in construction, automotive manufacturing, shipbuilding, and agricultural equipment production.
Square Steel Technical Specifications
Our square steel products are manufactured to precise dimensional and mechanical standards, ensuring reliable performance across demanding applications. Below are the key technical parameters available from our production lines:
| Parameter | Specification Range |
|---|---|
| Side Length | 8 mm × 8 mm to 250 mm × 250 mm |
| Length | 3 m – 12 m (custom lengths available) |
| Steel Grades | Q235B, Q345B, ASTM A36, AISI 1045, SS 304/316 |
| Yield Strength (Q345B) | ≥ 345 MPa per GB/T 1591 |
| Tensile Strength (A36) | 400–550 MPa per ASTM A36 |
| Dimensional Tolerance | ± 0.5 mm (hot-rolled) / ± 0.1 mm (cold-drawn) |
| Surface Finish | Black, peeled, ground, or polished |
| Carbon Content (A36) | ≤ 0.26% per ASTM specification |
| Density | 7.85 g/cm³ at 20°C (carbon steel) |
Every production batch undergoes chemical composition analysis via optical emission spectrometry, mechanical testing including tensile and Charpy impact tests, and ultrasonic flaw detection to guarantee internal soundness. Mill test certificates (MTC) conforming to EN 10204 3.1 are provided with each shipment.
Why Choose Our Square Steel Manufacturing Facility?
As a vertically integrated square steel manufacturer, we control every stage from steelmaking through final inspection. Our electric arc furnace and continuous casting lines produce billets with consistent chemical homogeneity, while our high-speed rolling mills achieve dimensional precision that reduces your downstream machining costs. We maintain ISO 9001:2015 and ISO 14001 certifications, and our products carry CE marking for European market compliance. With strategically located warehouses and partnerships with major shipping lines, we guarantee delivery lead times of 15–25 days for standard orders and expedited 7-day shipping for urgent requirements.
Get a Competitive Quote for Square Steel
Partner with a proven square steel manufacturer offering mill-direct factory pricing with no intermediary markups. Our dedicated sales engineers provide tailored solutions based on your exact grade, dimension, and volume requirements — ensuring maximum value for every order.
- 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
