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40x40 square tube hot dipped galvanized square steel pipe

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  • Description:

As a widely used material, the surface treatment of steel pipe has an important impact on its performance and service life. The following is a detailed description of the different treatment methods for square and rectangular steel pipe surfaces.

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Square and Rectangular Hollow Section Welded Steel Pipe 


DIAMETER: 20x20MM-600x600MM ; THICKNESS: 1.0MM--20.0MM


Q195 = S195 / A53 Grade A

Q235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST42.2

Q355 = S355JR / A500 Grade B Grade C


ASTM A500,  EN10219,  EN10210,  JIS G3466



1) Natural Black

2) Oiled 

3) Color Painted

4) Galvanized (zinc coating 30-500g/m2)




30%&70% T/T ;  100% LC AT SIGHT (others can be negotiated)






Southeast Asia, South Asia, Middle East, Europe, Middle&South America, Africa and Oceania


As a widely used material, the surface treatment of steel pipe has an important impact on its performance and service life. The following is a detailed description of the different treatment methods for square and rectangular steel pipe surfaces:

Natural black: After the production of the steel pipe, its original state shows a natural black, this color is due to the steel in the absence of any coating or treatment of natural oxide layer produced.

Natural black steel pipe coloring: In order to meet specific aesthetic requirements or identification needs, natural black steel pipes can be colored and coated with a layer of color coating to make the steel pipes show different colors.

Coating 3PE on the surface of natural black steel pipe: 3PE (three layers of polyethylene) is an anti-corrosion coating, by coating 3PE on the surface of the steel pipe, it can significantly improve the corrosion resistance of the steel pipe and extend its service life.

Pre-galvanized 30g/m2 or custom (30g/ m2-100g /m2) : Pre-galvanized refers to the process of steel pipe manufacturing, through the hot dip plating on the surface of the steel pipe plated with a layer of zinc to provide rust protection. The thickness of galvanized layer can be customized according to customer needs, ranging from 30g/m2 to 100g/m2.

Coated with pvc film: PVC (polyvinyl chloride) film is a plastic film that is coated on the surface of the steel pipe to provide an additional protective layer to prevent mechanical damage or chemical corrosion of the steel pipe.

Galvanized steel pipe coloring: For steel pipes that have been galvanized, the same can be colored to meet specific appearance requirements or to distinguish.

Galvanized steel pipe coated with 3PE: Similar to natural black steel pipe, galvanized steel pipe can also be coated with 3PE anti-corrosion layer on its surface to further enhance its corrosion resistance.

Hot dip galvanizing coating 200g/m2 or custom (200g/ m2-500g /m2) : Hot dip galvanizing is a thicker galvanizing layer that provides a higher level of rust protection. Customers can choose galvanized layers of different thickness from 200g/m2 to 500g/m2 according to the specific application requirements.

Strict quality control processes ensure that our products meet the highest industry standards. The following are the key aspects of our quality control system:

Our quality control team consists of 4 senior QC personnel, all of whom have at least 5 years of working experience. These professionals are responsible for conducting random inspections at all stages of the production process and after production is completed to ensure that the quality of the products is always maintained to the highest standards. Their expertise and experience enable us to identify and resolve potential quality issues in a timely manner, thus guaranteeing product consistency and reliability.

Our product inspection work is carried out in a nationally recognized laboratory with a certificate issued by the China National Accreditation Service for Conformity Assessment (CNAS). This means that our product inspections follow internationally recognized standards and procedures, ensuring the accuracy and authority of the inspection results.

To provide additional quality assurance, we accept third-party inspection services appointed or paid for by the Buyer. These third party inspection organizations, such as SGS (Swiss General Surveyor) and BV (French International Inspection Bureau), are internationally recognized inspection, identification, testing and certification organizations. Their inspection reports are accepted by many buyers worldwide, which adds an extra layer of trust and reliability to our products.

Our products have been approved in several countries, including Malaysia, Indonesia, Singapore, Philippines, Australia, Peru and the United Kingdom. These approvals demonstrate that our products comply with the regulations and standards of these countries and also reflect the recognition and credibility of our products in the international market.

About Us

The company mainly deals in color-coated, galvanized, stainless steel pipes, stainless steel coils, stainless steel plates of various materials; hot-rolled series of rebar, medium and heavy plates, coils, I-beams, angle steels, channel steels, H-beams and other steel products and deep processing Service. (The company’s annual inventory is more than 50,000 tons).The company adheres to the concept of “integrity first, service-oriented”, relying on the strong strength of major domestic steel groups, exerting the company’s strong resource integration capabilities, and serving and satisfying the needs of customers both in China and at abroad.Additionally, Zhishang Steel also has a powerful and professional logistics distribution system, which can provide customers with efficient, fast and flexible logistics services at any time.Our business covers Southeast Asia, the Middle East, Africa, Australia, Europe, the United States and other countries.Looking forward to the future, in order to maintain in-depth and stable cooperation with customers both at home and abroad, all employees of Zhishang Steel will work harder to provide Better products and services to create more added value for customers.

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