Factory Directly supply Black Steel Square Tube,Structural Square Hollow Steel Tube Sizes,Carbon Steel Welded Pipe

Short Description:



Place of Origin:Tianjin, China                                                                                       






Surface:no Surface;

Usage:Construction,Furniture,Water supply pipe, Gas pipe, Building pipe,Machinery,Coalmines,Chemicals,Electricity,Rrailway,Vehicles,Automotive industry,Highways,Bridges,Containers,Sports facilities,Agricultural,Machinery,Petroleum Machinery,Exploration machinery,Greenhouse construction;                                                                                                            

Section Shape:Round

Outer Diameter:219-920 mm


Product Detail




Product Tags

We constantly think and practice corresponding to the change of circumstance, and grow up. We aim at the achievement of a richer mind and body along with the living for Factory Directly supply Black Steel Square Tube,Structural Square Hollow Steel Tube Sizes,Carbon Steel Welded Pipe, Accurate process devices, Advanced Injection Molding Equipment, Equipment assembly line, labs and software advancement are our distinguishing feature.
We constantly think and practice corresponding to the change of circumstance, and grow up. We aim at the achievement of a richer mind and body along with the living for Black Steel Square Tube, Carbon Steel Welded Pipe, Structural Square Hollow Steel Tube Sizes, We care about every steps of our services, from factory selection, product development & design, price negotiation, inspection, shipping to aftermarket. We’ve implemented a strict and complete quality control system, which ensures that each product can meet quality requirements of customers. Besides, all of our goods have been strictly inspected before shipment. Your Success, Our Glory: Our aim is to help customers realize their goals. We’ve been making great efforts to achieve this win-win situation and sincerely welcome you to join us.
The product description:

Product name hollow section square tube
Wall Thickness 0.7mm–13mm
Length 1–14mAccording to customer requirements …
Outer Diameter 20mm*20mm—400mm*400
Tolerance Tolerance based on Thickness:±5~±8%
Shape square 
Material Q195—Q345,10#,45#,S235JR,GR.B-D,STK500,BS1387……
Surface treatment Galvanized
Zinc coating Pre-galvanized  square  tube:40–220G/M2Hot dip galvanized square tube :220–350G/M2
Certificate ISO,BV,CE,SGS
Payment terms 30%T/T deposit in advance,70%balance after B/L copy;100%Irrevocable L/C at sight,100% Irrevocable L/C after receive B/L copy 20–30days
Delivery times 25days after receive ur deposits
  1. Through a bundle
  2. According to customer’s requirement
Loading port Tianjin/Xingang

customer’s benefit:

What benefits do customers get:

1.we are factory .( our price will have an advantage over trading companies.)

2.We will update the price regularly with customers according to the steel market price.

Our suggest is ,when prices go down, customers purchase products.Customers can get high quality products at low prices and we can get orders.

3.Customers can get high quality products and efficient service.


Product detail :

2 长度 1
Thickness Length Diameter



4 PRE GI TUBE 2 56

Product photos

 Zinc coating

diameter detail


Different from other factories:

  • Delivery date:We discussed the delivery date with the customer.
  1. Prompt reply:After work, we will check the email in time,We will deal with emails from customers in time.Solve problems for customers in time.We provide efficient service
  2. Port : our factory just 40 kilometers from Xingang port ,is biggest port in the north of China .
  3.  The quality of the product:No joint pipe and square cut, deburred


Product photos :

Hot-dipped-Galvanized-Steel-Pipe-Square-Tube 2


Customer case:

An inquiry has been received from a customer in Singapore.The customer needs steel pipes.After we give the price to the customer.The customer says our price is high.Customers are compared with other suppliers.The customer purchased 10 containers in our factory for the first time .Now per month we are still supplying goods to this customer. The customer is satisfied with the quality of our products.Customers to our factory to establish long-term relations of cooperation.


Customer photos :


10 4 3


The customer purchased steel pipes in our factory. After the goods were produced, the customer came to our factory for inspection.

Main products :

Hot-dipped-Galvanized-Steel-Pipe-Square-Tube 4 焊管2
9ca1074903915b0c348b12fbc9e24af Patent Product2 1


Contact us:

Tianjin Min Jie Steel Co.,Ltd

Factory Address: No.B6-4 building, Oriental commercial street, Jinghai County, Tianjin. China

Contact person: linda

Wechat/whatsapp: +86 15028159378, skype:m15075132650

Tel: +86-022-68962601 


Mob: +86-15028159378



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  • Black steel square tubes are rectangular pipes made from black steel, known for their durability, corrosion resistance, and high compressive strength. These tubes are widely used across various fields due to their robust properties. Here are some primary applications of black steel square tubes:

    1. Construction and Structural Engineering

    • Building Frameworks: Black steel square tubes are commonly used in building frameworks, providing strong support and stability.
    • Bridges: They are utilized in bridge support structures, capable of withstanding significant pressure and weight.
    • Scaffolding: At construction sites, black steel square tubes provide safe and reliable platforms for workers.

    2. Infrastructure

    • Railway and Highway Guardrails: Widely used in the guardrail systems of railways and highways, these tubes offer protection and segregation.
    • Transmission Towers: Employed in power transmission systems, black steel square tubes can withstand wind and other natural forces.

    3. Manufacturing

    • Machinery Manufacturing: Black steel square tubes are used to construct the frames and supporting parts of machinery.
    • Agricultural Equipment: They are used in the manufacturing of agricultural machinery like tractors and seeders, providing sturdy structural support.

    4. Furniture and Decoration

    • Furniture Making: Black steel square tubes are used in modern furniture design, such as tables, chairs, and bookshelves, offering an industrial and contemporary aesthetic.
    • Interior Decoration: Used in interior structural elements like partitions and railings, they combine aesthetics with practicality.

    5. Transportation

    • Vehicle Frames: Used in manufacturing the frames of trucks, trailers, and other vehicles, black steel square tubes provide strong support and durability.
    • Containers: As the structural framework of containers, these tubes can withstand long-term transportation and heavy loads.

    6. Other Applications

    • Sports Facilities: Used in the construction of sports facilities like basketball hoops, soccer goals, and stadium stands.
    • Billboards: Employed as the support structures for outdoor billboards, black steel square tubes can endure weather conditions and sunlight.

    Due to their versatility and durability, black steel square tubes are widely used in various sectors, fulfilling diverse industrial and civilian needs.


    Our Advantages:

    Source Manufacturer: We directly manufacture Black steel square tubes, ensuring competitive pricing and timely delivery.

    Proximity to Tianjin Port: Our factory’s strategic location near Tianjin Port facilitates efficient transportation and logistics, reducing lead times and costs for our customers.

    High-Quality Materials and Strict Quality Control: We prioritize quality by using premium materials and implementing rigorous quality control measures throughout the manufacturing process, guaranteeing the reliability and durability of our products.

    Payment Terms:

    Deposit and Balance: We offer flexible payment terms, requiring a 30% deposit upfront with the remaining 70% balance to be settled after receiving the Bill of Lading (BL) copy, providing financial flexibility to our customers.

    Irrevocable Letter of Credit (LC): For added security and assurance, we accept 100% at sight Irrevocable Letters of Credit, offering a convenient payment option for international transactions.

    Delivery Time:

    Our efficient production process enables us to fulfill orders promptly, with a delivery time of within 15-20 days after receiving the deposit, ensuring timely supply to meet project deadlines and requirements.


    Our products meet stringent quality standards and are certified by reputable organizations, including CE, ISO, API5L, SGS, U/L, and F/M, demonstrating compliance with international regulations and specifications, and ensuring customer confidence in product quality and performance.


    Head Office : 9-306 Wutong North Lane, North side of Shenghu Road, West District of Tuanbo New Town, Jinghai District,Tianjin ,China

    Welcome to visit our factory



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