Black Square Tubes

Your Professional Black Square Tubes Manufacturer

TIANJIN BO YI DA IMPORT AND EXPORT CO.,LTD is a modern production and exporting enterprise with professional experiences in international business.Our Product: galvanized steel, galvalume steel, PPGI, PPGL, hot rolled steel, cold rolled steel, stainless, wire rod, H-beam, steel pipe etc. The company is committed to providing customers with high-quality and reasonable price steel products and strives to create value for customers as its own responsibility.

Why Choose Us

High Quality
We take pride in the craftsmanship of our products and ensure that each one meets our strict standards for quality.

Production Market
Our products are exported to all over the world, including Africa (West Africa, East Africa, South Africa), Southeast Asian countries (Philippines, Vietnam, Singapore, Indonesia), and South American countries, etc. Our products are widely used in construction projects.

Global Shipping
Our company has a strong and professional logistics and distribution system, ready to meet our customers' various needs at any time.

End-to-end Services
☆Pre-Sales service
* Inquiry and consulting support.
* Sample testing support
* View our Factory.
☆After-Sales Service
*Videos or photos will send to customers
*100% Granutee quanlity and quantity.
*Vessel tracking.

Products Specifications

Thickness	1-120mm
Length	5m-14m,5.8m,6m,10m-12m,12m
Wall Thickness	0.7MM~30MM
Grade	Grade A, Grade B, Grade C
Standard	JIS G3466, EN 10219, GB/T 3094-2000, GB/T 6728-2002
Materials	Q195, Q235, Q345; ASTM A53 Gr A, Gr B, STKM11, ST37, ST52, 16Mn, etc.
Applications	Fence, greenhouse, door pipe, greenhouse Low pressure liquid, water, gas, oil, line pipe for both indoor and outdoor the building construction
Type	Steel Hollow Section

Advantages of Black Square Tubes

High-Temperature and High-Pressure Resistance

One of the main advantages of black square tubes is their ability to withstand high temperatures and pressures. This means they can be used in a variety of applications subject to high temperatures and pressures, such as in the oil and gas industry, chemical processing plants, and power generation facilities.

Corrosion Resistance

Another advantage of black square tubes is their corrosion resistance. This is because they are coated with a protective oil that helps prevent rust and other forms of corrosion on the pipe surface. This makes them ideal for use in environments where corrosion is a serious concern, such as marine applications or areas exposed to harsh weather conditions.

Excellent Mechanical Properties

Black square pipe boasts high strength, with a tensile strength of 400-550 MPa (such as ASTM A53 Gr.B), making it suitable for load-bearing structures.It also has good ductility, and its low carbon content (such as mild steel black pipe) makes it easy to cold-bend, cut, and weld.

High Processing Flexibility and Convenient Construction

Black square pipe has excellent weldability, and mild steel is suitable for a variety of processes, including arc welding and gas shielded welding. Cutting, drilling, or threading can be performed on-site as needed, saving time and labor.

Application of Black Square Tubes

Building and Construction: Black square tubes are ideal for use as support structures and frameworks, such as scaffolding, bridges, and highway guardrails.

Machinery Manufacturing: They are used to make various machine parts, such as shafts, gearbox housings, and couplings, as well as transmission components in agricultural equipment.

Transportation: Black square tubes can be found in automotive suspension systems, chassis components, and connecting rods for train carriages.

Energy Industry

They are used in oil and gas pipelines, as well as in the towers and blades of wind turbines.

Furniture and Decoration

Modern-style furniture legs and decorative strips may use black square tubes to enhance their fashionable appearance.

Other Fields

Black square tubes are also used in sports equipment, musical instrument stands, and the skeletons of medical devices due to their sturdy nature.

Black square tube manufacturing process

Black square tube refers to a square steel tube with black oxide scale or black anti-rust treatment on the surface. Its manufacturing process is mainly divided into two categories: seamless black square tube and welded black square tube. The process flow of the two is different.
★Welded black square tube process

Raw material preparation: Select high-quality steel strip.
Uncoiling and leveling: Unroll and level the steel strip.
Forming: Bend into a square shape by a forming machine.
Welding: Use resistance welding or submerged arc welding to weld the pipe seam.
Weld seam treatment: Grind the weld seam to ensure the surface is flat.
Cutting and surface treatment: Cut to length, keep black oxide scale on the surface or spray black paint for rust prevention.
Inspection and packaging: Check the size and weld quality before packaging.

★Seamless black square tube process

1.Use seamless steel pipe raw materials.

2.Cold bending into a square tube shape.

3.Straightening and cutting, surface treatment before delivery.

Packaging and Shipping

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FAQ

Q: Could You Provide The Compliment Samples?

A: Yes, we could provide the free samples on condition that it is available in stocks, however, the transportation fee is borne by buyer.

Q: Could You Produce According To The Samples?

A: Yes, we can customer-made by your samples or technique drawings, we can build the mold and fixtures.

Q: What's Your Delivery Time?

A: For stocks, we could transport the goods to loading port within 7 work days after we received the deposit. For production period, it usually takes about 15 days to 30 days after we received the deposit.

Q: What's The Terms Of Packing?

A: Generally, we pack our goods in bundles or coils with rods or belts, we could also pack the goods as the customers' requirement.

Q: What's Your Terms Of Payment?

A: 30%T/T as the upfront deposit, 70% before delivery, we will show you the photos and package before you pay the balance.

Q: How could you guarantee your products quality?

A: Each piece of products is manufactured by certified workshops, inspected by us piece by piece according to national QA/QC standard. We also could issue the warranty to customer to guarantee the quality.

Q: Is there a difference between black square pipes and galvanized square pipes?

A: Black square pipes undeniably possess a significant similarity to galvanized square pipes. Both resemble those square pipes' black appearance. Galvanized pipes have a layer of zinc coating. This protects them from rust. On the other hand, black square pipes may not have any coating at all. They are primarily used indoors or in low-moisture environments. Therefore, the two are distinguished between galvanized square pipes and black square pipes. This difference makes them suitable for distinct environments.

Q: What is the reason for black square pipes to have a black coloration?

A: The black coloration arises from the manufacture of square pipes. Most of which are made from mild or carbon steel. The steel is heated during the production process. Then, the coating layer of oil is left on the surface. This oil layer gives the pipe its black color. The layer also protects it from rusting. That's why the square pipes are commonly used inside buildings and outdoor fences.

Q: Which are the common applications of black square pipes?

A: Due to its adaptability, the black square pipe is preferred in various settings. They're frequently applied in construction. Black pipe's square form makes it an ideal choice for structural support like beams and frames. Additionally, they're usually utilized in making furniture where aesthetic value and strength are both required. Moreover, they are hollow square steel pipes frequently deployed in machine and equipment manufacturing.

As one of the leading black square tubes manufacturers and suppliers in China, we warmly welcome you to buy high quality black square tubes in stock here and get quotation from our factory. Contact us for more details. Welded Steel Square Fence Post, ASTM A36 Steel Square Hollow Section, BI Pipe S 20