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Square Steel & Mild Steel Square Tube，Q235B、Q355B、GB/T 6728-2017

Negotiable MOQ: 5 Metric Tons (Price negotiable depending on order volume and customization)

Key Specifications

Business Type:

Manufacturer

Year Established:

2024

Factory Size:

3,000-5,000 square meters

Shandong Shoukun Metal Materials Co., Ltd.

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

Qingdao port，Sanghai port,Tianjin port

Delivery Detail:

7 days

1. Core Product Information

Product Name: Carbon Structural Square Steel Pipe / Rectangular Steel Pipe
Key Materials: Q235B, Q355B (Mainstream national standard materials, featuring high strength, excellent weldability, and superior cost-performance ratio)
Chemical Composition:

Q235B (Per GB/T 700-2006): Carbon (C) ≤ 0.20%, Silicon (Si) ≤ 0.35%, Manganese (Mn) 0.30-1.40%, Sulfur (S) ≤ 0.045%, Phosphorus (P) ≤ 0.045%. Residual elements (Cr, Ni, Cu) ≤ 0.30%. Low carbon design ensures weldability and improves toughness.
Q355B (Per GB/T 1591-2018): Carbon (C) ≤ 0.20%, Silicon (Si) ≤ 0.55%, Manganese (Mn) ≤ 1.60%, Sulfur (S) ≤ 0.035%, Phosphorus (P) ≤ 0.035%. Total content of micro-alloying elements (Nb/V/Ti) ≤ 0.22%, Carbon equivalent ≤ 0.44%. Balances strength and welding performance.

Execution Standard: GB/T 6728-2017 (National Standard for Cold-Formed Steel Sections). Customized production available per international standards such as ASTM, JIS, and EN.
Forming Process: Cold-formed / Hot-rolled process. Features regular section, uniform wall thickness, and high dimensional accuracy.
Surface Treatment: Black Pipe (original surface), Hot-Dip Galvanized (rust-proof and durable, suitable for outdoor and humid environments).

2. Specifications & Customization Capability

Customization Service: Support non-standard size customization (special side length, wall thickness, length). Can be processed according to customer's drawings or technical requirements.
Processing Adaptability: Provide secondary processing services such as cutting, beveling, drilling, and welding to meet the needs of direct use in engineering.

3. Core Product Advantages (Including Application Scenarios)

Stable Mechanical Properties: Excellent bending, compression, and torsion resistance. Strong load-bearing capacity adapts to heavy-load scenarios like building steel structure frames, factory columns, and mechanical frames, ensuring structural stability and operational safety.
Efficient Processing: Regular section, burr-free. Low difficulty in welding, drilling, and bending. Adapts to scenarios requiring secondary processing such as curtain wall keels, guardrail supports, and conveying frames, significantly reducing construction and production cycles as well as labor costs.
Versatile Durability: Hot-Dip Galvanized finish is rust and corrosion resistant, ideal for outdoor/humid scenarios like road guardrails, PV supports, and bridge components. Black Pipe offers outstanding cost-effectiveness, suitable for indoor/short-term scenarios such as indoor storage racks, decoration projects, and equipment bases.
Rapid Stock Response: Sufficient stock for general specifications. Covers most mainstream application scenarios including construction, machinery, infrastructure, and warehousing. No long waiting for production; combined with fast delivery, it meets customers' urgent project needs.

4. Application Scenarios

Construction Engineering: Main structures such as steel structure frames, curtain wall keels, factory columns, and building supports.
Machinery Manufacturing: Mechanical accessories like equipment frames, machine bases, conveying frames, and industrial shelves.
Infrastructure & Municipal: Road guardrails, PV supports, bridge components, warehousing logistics shelves, etc.
Other Fields: Container frames, vehicle modification, pipe supports, decoration engineering, and other multi-scenario general applications.

5. Transaction & Service Guarantee

Minimum Order Quantity (MOQ): >5 Tons for in-stock orders. For customized products, MOQ is negotiated based on specific requirements.
Delivery Time: Shipment within 5-7 days after order confirmation (for in-stock orders). For customized orders, delivery time is negotiated based on production schedule to ensure timely delivery.
Packing & Transportation: Packed with steel straps/wooden pallets, suitable for sea, land, and railway transportation. Support full truckload and less-than-truckload delivery.
Quality Assurance: 100% inspection before delivery. Provide material certificates and quality inspection reports, complying with national and customer technical standards.
After-sales Support: Provide technical consultation, installation guidance, and rapid response to quality issues, ensuring customer satisfaction.