galvanized steel square pipe gate designs 14 gauge tubing 4×4 square tubing square tube for pergola

Short Description:



Place of Origin:Tianjin, China
Standard:GB/T3091-2001,BS1387-1985,DIN EN10025,EN10219,JIS G3444:2004,ASTM A53 SCH40/80/STD,BS-EN10255-2004;
Surface:Pre-galvanized,Hot dip galvanized,Electro galvanized,Black,Painted,Threaded,Socket,Engraved;
Usage:Construction,Furniture,Water supply pipe, Gas pipe, Building pipe,Machinery,Coal mines,Chemicals,Electricity,Rrailway,Vehicles,Automotive industry,Highways,Bridges,Containers,Sports facilities,Agricultural,Machinery,Petroleum Machinery,Exploration machinery,Greenhouse construction;
Section Shape:Round
Outer Diameter:19 - 114.3 mm

Product Detail




Product Tags


Product Name
galvanized square rectangular pipe
Out Diameter
square pipe10*10mm-500*500mmas customer request.
rectangular pipe 20*10mm as customer request.
Pre galvanized:0.6-2.5mm.
Hot dipped galvanized: 0.8- 25mm.
Zinc coating
Pre galvanized:5μm-25μm
Hot dipped galvanized:35μm-200μm
Electronic Resistance Welded (ERW)
Steel Grade
Q235, Q345, S235JR, S275JR, STK400, STK500, S355JR, GR.B-D
GB/T6728-2002 ASTM A500 Gr.A.B.C.JIS G3466
Surface Finish
Pre-galvanized, Hot dipped galvanized, Electro galvanized, Black, Painted, Threaded, Engraved, Socket.
International Standard
1.Big OD:in bulk 

2.Small OD:packed by steel strips 
3.woven cloth with 7 slats 
4.according to the requirements of customers
Main Market
Middle East,Africa, Asia and some Uropean country and South America, Australia
Country of origin
5000Tons per month.
1. Payment terms : T/T ,L/C 

2. Terms of trade : FOB ,CFR,CIF ,DDP,EXW 
3. Minimum order : 2 tons 
4. Delivery time : Within 25 days.




● The steel supplied by our company is enclosed with the original material book of the steel factory.
● Customers can choose any length or other requirements they want.
● Ordering or purchasing all kind of steel products or special specifications.
● Adjust the temporary lack of specifications in this library, saving you from the trouble of rushing to purchase.
● Transport services, can be delivered directly to your designated place.
● The materials sold, we are responsible for the overall quality tracking, for you to eliminate worries.



● Waterproof plastic bag then bundle with strip, On the all. 

● Waterproof plastic bag then bundle with strip, On the end.

● 20ft container: not more than 28mt. and the lenath is not more than 5.8m. 

● 40ft container: not more than 28mt. and the length is not more than 11.8m.



● All the pipes is high-frequency welded.

● Both inner and outer welded stab can be removed. 

● Special design available according to requirement. 

● Pipe can be necked down and punched holes and so on. 

● Supplying BV or SGS Inspection if client need.



Tianjin Minjie steel Co.,Ltd was established in 1998. Our factory more than 70000 square meters, just 40 kilometers from XinGang port, which is the biggest port in the north of China . We are a professional manufacturer and exporter for steel products.The main products are pre galvanized steel pipe, hot dip galvanized pipe, welded steel pipe ,square&rectangular tube and scaffolding products.We applied for and received 3 patents.They are groove pipe ,shoulder pipe and victaulic pipe. Our manufacturing equipment include 4 pre-galvanized product lines, 8ERW steel pipe product lines,3 hot-dipped galvanized process lines.According to standard of GB ,ASTM ,DIN ,JIS.The products are under the ISO9001 quality certification.


Annual output of various pipe is more than 300 thousands tons.We had obtained the honor certificates issued by the Tianjin municipal government and Tianjin quality supervising bureau yearly. Our products are widely applied to machinery,steel construction,agricultural vehicle and greenhouse,auto industries,railway,highway fence,container inner structure,furniture and steel fabric. Our company owns the firs class professional technique adviser in China and the excellent staffs with professional technology.The products had been sold to all over the world. We believe that our high quality products and services will be your best choice.Hope get your trust and support.Looking forward to the long term and good cooperation with you sincerely.


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  • Our Advantages:

    Source Manufacturer: We directly manufacture galvanized steel pipes, 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.

    Galvanized steel square pipes are highly resistant to corrosion, have a long service life, and offer high strength, making them widely applicable across various fields. Here are some primary application areas:

    1. Construction Engineering:
    – Structural Support: Used as support structures in buildings, such as frames, columns, and beams.
    – Scaffolding: Utilized in scaffolding systems for construction, providing a safe working platform.
    – Fences and Railings: Employed for perimeter fences and railings of buildings, offering both durability and aesthetic appeal.

    2. Infrastructure Construction:
    – Bridges: Used as support structures in bridges, particularly for bridge railings and protective nets.
    – Tunnel Support: Applied in tunnel

    Galvanized steel square pipes are known for their strong corrosion resistance, long service life, and high strength, making them widely used across various industries. Here are the main application areas:

    1. Construction Engineering:
    – Structural Support: Used in building structures such as frames, columns, and beams.
    – Scaffolding: Utilized in scaffolding systems for construction, providing safe working platforms.
    – Fences and Railings: Employed for perimeter fences, railings, and other protective barriers in buildings.

    2. Infrastructure Development:
    – Bridges: Serve as supporting structures in bridges, especially in bridge railings and protective nets.
    – Tunnel Supports: Used in tunnel construction for support structures, enhancing safety.

    3. Agriculture and Livestock:
    – Greenhouses: Used in the framework of greenhouses, offering rust resistance and durability in harsh environments.
    – Livestock Fencing: Applied in fencing for livestock farms, ensuring the safety and containment of animals.

    4. Industrial Manufacturing:
    – Machinery Frames: Used in the frames and support structures of various machinery, providing a sturdy foundation.
    – Piping Systems: Employed in industrial piping systems for transporting liquids and gases, offering excellent corrosion resistance.

    5. Transportation:
    – Automotive Industry: Used in the chassis and structural components of vehicles, enhancing strength and durability.
    – Railway Facilities: Applied in railway construction for fences and other supporting structures.

    6. Home and Decoration:
    – Furniture Manufacturing: Used in making furniture such as tables, chairs, and shelves, providing aesthetic appeal and structural integrity.
    – Decorative Engineering: Utilized in home decoration for creating various decorative frames and structures.

    7. Municipal Engineering:
    – Public Facilities: Employed in public infrastructure like streetlight poles, billboards, and bus stops, offering weather resistance and durability.
    – Water Conservancy Projects: Used in water conservancy facilities for constructing railings and protective nets.

    Due to their excellent performance and wide range of applications, galvanized steel square pipes are essential materials in modern engineering and construction.


    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


    The official website of the company will send someone to reply to you on time. If you have any questions, you can ask



    The office phone is always open. You are welcome to call