| Customization: | Available |
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| After-sales Service: | 24 Hours 7 Days |
| Warranty: | Two Years |
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The manufacturing process of galvanized square and rectangular tubes mainly includes the following steps:
Material Selection: High-quality low-carbon steel coil is used as the raw material for production. These raw materials undergo rigorous physical and chemical testing before being used to ensure they meet production requirements.
Cutting and Processing: The raw material coil is cut into appropriately sized square tube blanks according to the specifications.
Cleaning Treatment: The square tube blanks are sent to a cleaning tank for acid cleaning to remove surface oils, oxides, and other impurities, ensuring a clean and contaminant-free surface. This step is crucial for subsequent galvanizing treatment.
Sulfuric Acid Immersion: The cleaned square tube blanks are immersed in diluted sulfuric acid to further remove impurities such as iron oxide from the surface and provide suitable surface conditions for galvanizing.
Galvanizing Bath Immersion: The square tube blanks, after sulfuric acid immersion, are sent to the galvanizing bath. The zinc solution in the galvanizing bath has an appropriate temperature and concentration. The square tube blanks are continuously immersed and withdrawn from the galvanizing bath at a certain speed, allowing a uniform layer of zinc to be plated on the surface of the tube. This step is the core of galvanized square tube production.
Surface Treatment: After exiting the galvanizing bath, the zinc layer on the surface of the square tube may have some chlorides and other impurities. Therefore, re-cleaning is required using a diluted acid wash tank or water wash tank to ensure the purity of the zinc layer surface.
Drying Treatment: The cleaned square tube blanks are dried through high-temperature drying or increased transmission speed to evaporate all moisture on the blanks. This step helps prevent the zinc layer from peeling off or corroding during subsequent processing.
Cooling Treatment: The dried square tube blanks are sent to a cooling tank to reduce their temperature to room temperature. This step helps stabilize the size and shape of the square tubes, preventing deformation issues caused by thermal expansion and contraction.
Quality Inspection: The galvanized square tubes undergo appearance inspection and physical performance testing. Appearance inspection includes checking the flatness, adhesion, and thickness of the zinc layer; physical performance testing includes tensile strength, bending performance, cold bending performance, etc. These inspections ensure that the quality of the galvanized square tubes meets relevant standards and requirements.
Embossing Marks: According to requirements, embossing marks, including the manufacturer's logo, specifications, standard number, and other information, are made on the square tubes. These marks help users identify and use the galvanized square tubes.
Packaging and Shipping: The qualified galvanized square tubes are packaged, commonly using packaging methods such as plastic film or woven bags. They are then shipped out of the warehouse for delivery to customers.
In some advanced production processes, welding technology is also used to improve the precision and smoothness of the galvanized square tubes. Welding technology can eliminate welding marks and seam defects on the tubing, making the appearance of the galvanized square tubes more aesthetically pleasing and uniform. At the same time, the seamlessness of galvanized tubes is mainly achieved through tension reduction. This process can improve the dimensional accuracy and processing smoothness of galvanized tubes, thereby enhancing their mechanical properties and performance.
Building Structures: Galvanized square and rectangular tubes are extensively used in square tube frameworks, stairway railings, bed frames, furniture, and balustrades in building structures. Their high strength, corrosion resistance, and ease of processing make them suitable for meeting various structural demands in construction.
Machinery Manufacturing: These tubes can be used not only to fabricate various mechanical parts but also as the framework for machinery and equipment, such as compressors, grinding machines, and medical devices.
Road Guardrails: Road guardrails are crucial safety facilities for ensuring road traffic safety. Galvanized square and rectangular tubes serve as the supporting material for road guardrails, providing corrosion resistance, weather resistance, and high strength to ensure the safety and stability of the guardrails.
Billboard Supports: In various outdoor billboards or signs, stable and reliable support poles are often required. Galvanized square and rectangular tubes can be used as materials for billboard supports, offering convenience in use and effectively ensuring the stability of the billboards.
| Specification for Square Tubes (mm) | Specification for Rectangular Tubes (mm) | ||
| 16x16x0.4~1.5 | 380x380x8.0~ 14.0 | 10x20x0.6~1.5 | 250x150x6~ 12.0 |
| 18x18x0.4~1.5 | 400x400x8.0~ 14.0 | 14x21x0.6~1.5 | 250x100x6~ 12.0 |
| 20x20x0.4~15 | 420x420x10.0~ 14.0 | 15x30x15~1.5 | 250x200x6~ 12.0 |
| 25x25x0.6~20 | 450x450x10.0~ 14.0 | 15x38x0.6~1.5 | 300x150x6~ 12.0 |
| 30x30x0.6~4.0 | 480x480x10.0~ 14.0 | 20x30x0.6~20 | 300x200x6~ 12.0 |
| 34x34x1.0~20 | 500x500x10.0~ 14.0 | 20x40x0.8~20 | 300x250x6~12.0 |
| 35x35x1.0~4.0 | 20x50x1.0~20 | 400x250x8~ 12.0 | |
| 38x38x1.0~4.0 | 550x550x10.0~ 40.0 | 22x35x09~20 | 400x300x8~ 12.0 |
| 40x40x1.0~4.5 | 600x600x10.0~ 40.0 | 25x40x0.9~3.75 | 450x200x8~ 12.0 |
| 44x44x1.0~4.5 | 700x700x10.0~ 40.0 | 25x65x1.0~20 | 450x250x8~ 12.0 |
| 45x45x1.0~5.0 | 800x800x10.0~ 50.0 | 30x40x1.0~3.75 | 400x300x8~ 12.0 |
| 50x50x1.0~5.0 | 900x900x10.0~ 50.0 | 30x45x1.0~3.75 | 400x350x8~ 12.0 |
| 60x60x15~5.0 | 1000x1000x10.0~ 50.0 | 30x50x1.0~4.0 | 500x200x10~12.0 |
| 70x70x2.0~6.0 | 30x60x1.0~4.5 | 500x250x10~12.0 | |
| 75x75x2.0~6.0 | 40x50x1.0~4.5 | 500x300x10~12.0 | |
| 80x80x2.0~60 | 40x60x1.0~5.0 | 500x350x10~12.0 | |
| 85x85x2.0~60 | 40x80x15~5.0 | 500x400x10~12.0 | |
| 95x95x2.0~80 | 40x100x2.0~5.0 | 500x450x10~12.0 | |
| 100x100x20~8.0 | 50x60x2.0~5.0 | ||
| 120x120x40~8.0 | 50x80x2.0~5.0 | 600x200x10~28.0 | |
| 150x150x6.0~ 10.0 | 50x100x2.0~80 | 600x400x10~28.0 | |
| 180x180x6.0~ 12.0 | 60x80x2.0~6.0 | 600x500x10~28.0 | |
| 200x200x6.0~ 12.0 | 80x100x2.0~80 | 800x400x10~28.0 | |
| 220x220x6.0~ 14.0 | 120x60x25~10.0 | 800x600x10~28.0 | |
| 250x250x6.0~ 14.0 | 120x80x25~10.0 | 800x700x10~28.0 | |
| 280x280x6.0~ 14.0 | 150x100x25~12.0 | 1000x400x10~280 | |
| 300x300x8.0~ 14.0 | 180x150x25~12.0 | 1000x500x10~280 | |
| 320x320x80~ 14.0 | 200x100x4~12.0 | 1000x600x10~280 | |
| 350x350x8.0~ 14.0 | 200x150x4~12.0 | 1000x800x10~ 28 | |
| Specification | Specification | ||
| Square tube | 20*20*0.6-2.0 | Square tube | 130*130*3.0-12 |
| Square tube | 25*25*0.6-2.0 | Square tube | 140*140*3.0-12 |
| Square tube | 30*30*0.8-3.0 | Square tube | 150*150*3.0-12 |
| Square tube | 40*40*0.8*4.0 | Square tube | 160*160*4.0-12 |
| Square tube | 50*50*1.0*5.0 | Square tube | 180*180*4.0-12 |
| Square tube | 60*60*1.2-6.0 | Square tube | 200*200*4.0-14 |
| Square tube | 70*70*2.0-6.0 | Square tube | 220*220*4.0-16 |
| Square tube | 75*75*2.0-6.0 | Square tube | 250*250*6 0-16 |
| Square tube | 80*80*2.0-8.0 | Square tube | 280*280*6 0-16 |
| Square tube | 90*90*2.0-8.0 | Square tube | 300*300*6. 0-16 |
| Square tube | 100*100*2.0-12 | Square tube | 350*350*8.0-16 |
| Square tube | 120*120*3.0-12 | Square tube | 400*400*8.0-16 |
Shandong Desheng Supply Chain Management Co., Ltd. One-stop steel solutions and provider, Located in Jinan city founded in 2015, We are specialized in Carbon steel plate Stainless steel plate, Steel structural profiles such as Steel channel, Steel angle, H beam, I beam, Steel square and rectangular tube and Steel round pipe, Steel solid bars such as Round bar, Deformed bar, Wire coil etc.
Cutting, bending, galvanizing, and painting fabricating services are also available. All our products are qualified, and chemical and strength results are approved by the SGS or BV test. International standards and grades such as GB (Q235B/ Q355B), ASTM (A36/ A572 GR50/ A500 GRB), JIS (SS400/ SS540), EN (S235JR/ S275JR/ S355JR/ S355J0/ S355J2) are available. We have been honored and awarded in many buildings, engineering, and construction industries and have had experience supplying steel materials to power plant projects, oil and gas transport projects, warehouse building projects, vessel building projects, ocean platforms, public facilities, etc. Our stock quantity reached 10 thousand tons, and the annual export amount was over 10, 000, 0 tons. Various sizes and grades could be ready to deliver fast within seven days. We export products to Korea, Sri Lanka, Philippines, Bangladesh, Thailand, Pakistan, Singapore, Vietnam, Austria, USA, Mexico, Fiji, Ireland, Italy, France, South Africa, Iraq, Burkina Faso, etc., a total of over 40 countries. Our well-equipped facilities and excellent quality control throughout all stages enable us to guarantee total customer satisfaction. Adhering to the business principle of mutual benefits, we have had a reliable reputation among our customers because of our professional services, quality products and competitive prices. As a reputed and reliable supplier, we have many committed clients who have cooperated with us for more than five years worldwide.
1.Who are we?
We are a GB/T 19001-2016/ISO 9001:2015 certified professional total solution provider and supplier of steel products.
2. What can we supply?
We provide one-stop steel sales and professional steel supply chain management. Our main products include steel coil, steel plate, steel profile, steel pipe, steel structure and wind power tower barrel.
3.what do we specialize in?
We specialize in providing medium and heavy plates including shipbuilding board, High strength steel plate, weathering resistant steel, corrosion resistant steel plate, abrasion resistant steel plate, boiler and pressure vessel steel plate, high-rise building steel structure and wind power tower barrel.
4. Who are our cooperative factories?
As a steel company that has been in this line of business for many years, we have established profound and firm relationships with major large China's steel manufacturers including Shandong Steel, AN STEEL, Baogang Steel, Rizhao Steel and Nanjing Steel and gained great reputations from domestic and overseas clients.
5. what is our payment term?
30% T/T advance and 70% T/T balance before delivery.
6. Can I have a free sample?
Yes, a sample in small size is provided for free of charge, but the client shall bear delivery fee.
7.What is lead time and delivery time?
We will arrange production immediately upon the receipt of advance payment and shop to you after the payment of balance.
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