Meta Title:‌

Premium Black Square Steel Tubes - Manufacturer & Supplier | Blubro

Meta Description:‌

Blubro supplies high-quality black square steel tubes for structural and architectural applications. Various sizes and specifications available with competitive global pricing.

Keywords:‌

square steel tube, black steel pipe, structural square tubing, construction steel profile, industrial metal tubing, China steel manufacturer, Blubro steel supplier

Product Specifications:‌

Material Composition:‌

Grades Available: Q235, Q345, ASTM A500

Size Range: 20x20mm to 150x150mm

Wall Thickness: 1.0mm-6.0mm

Length: 6m standard (custom lengths available)

Standard: ASTM, JIS, DIN, GB

Manufacturing Process:‌

Cold-formed from hot-rolled coil

High-frequency welding

Sizing and straightening

Surface treatment (black painted/oiled)

End finishing (plain/squared)

Technical Parameters:‌

Yield Strength: 235-345MPa

Tensile Strength: 375-500MPa

Elongation: 22-25%

Squareness: ≤1° angular deviation

Straightness: ≤2mm/m

Key Applications:‌

✔ Structural frameworks

✔ Architectural elements

✔ Machinery frames

✔ Furniture manufacturing

✔ Industrial equipment

Competitive Advantages:‌

Precision Forming‌ - ±0.3mm dimensional tolerance

Weld Quality‌ - Seamless appearance

Surface Finish‌ - Uniform black coating

Custom Solutions‌ - Special sizes and alloys

Quality Assurance‌ - ISO 9001 certified

Global Logistics‌ - Container-optimized packing

Pricing Structure:‌

FOB Price Range: 

700

−

700−1,300/ton

MOQ: 15 tons (standard sizes)

Payment Terms: LC/TT 30% deposit

Delivery Lead Time: 18-25 days

Company Highlights:‌

120,000m² production facility

8 years square tube specialization

Complete testing equipment

24/7 multilingual support

One-stop procurement solution

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