Hot Dipped Hollow Section Q345 Welded Galvanized Square Steel Tube for Structure

• Customization: Available
• After-sales Service: Can Contact Seller Any Time
• Warranty: Can Contact Seller Any Time
• Model NO.: DX51d Q235
• Type: Welded
• Technique: Galvanized
• Material: Carbon Steel
• Surface Treatment: Polished
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Square
• Size: 25 *25, 40 * 40, 50 *50, 100* 100
• Application: Bridge, Building Construction, Drill Pipe
• Shape: Square/Round
• Length: 5-12m or as Your Requirement
• Delivery Time: Within 7-15 Days After Received Down Payment
• Color: Sliver
• Materials: Dx51d, Q235
• MOQ: 2tons
• Classification: Hot DIP Galvanized/Cold Galvanized
• Transport Package: Sea Worth
• Specification: Customers′ Requirement
• Trademark: ZUNKAI
• Origin: China
• HS Code: 7212300000
• Production Capacity: 500000 Tons Per Month

Product Description

Size	20*20--600*600mm, or as the customer's request
Length	As the customer's request
Zn coating	0.13-0.8 mm is 30-150 g/m2; 0.8-1.5 mm is 30-180 g/m2;1.5-6.0 mm is 30-275 g/m2
Steel grade	DX51D,DX52D,DC01,DC02,SGHC
Surface	regular/mini/big/zero spangle, skin pass, chromate, unoiled, dry
Packaging	the seaworthy export standard package, or according to the customers requirement
Delivery time	With 15 -25 days after receipt of deposit or L/C

 

Product Description

Classification
Galvanized square tubes are divided into hot-dip galvanized square tubes and cold-dip galvanized square tubes from the
production process. It is precisely because of the different processing of these two galvanized square tubes that they have many
different physical and chemical properties. Generally speaking, they have many differences in strength, toughness and mechanical
properties.

Hot-dip galvanized square tube:It is a square tube made of steel plate or steel strip after being crimped and welded. On the basis
of this square tube, the square tube is placed in a hot-dip galvanizing pool after a series of chemical reactions. A square tube formed.
The production process of hot-dip galvanized square tube is relatively simple, and the production efficiency is very high, and there are
many varieties and specifications. This kind of square tube requires very little equipment and capital, and is suitable for the production
of small galvanized square tube manufacturers. But in terms of strength, the strength of this kind of steel pipe is far lower than that of
seamless square pipe.

 

Cold galvanized square tube

The cold-galvanized square tube uses the principle of cold-galvanizing on the square tube used to make the square tube anti-corrosion.
Different from hot-dip galvanizing, cold-dip galvanizing mainly uses electrochemical principles to prevent corrosion. Therefore, it is necessary
to ensure sufficient contact between zinc powder and steel to generate electrode potential differences. Therefore, surface treatment of steel
is very important.

The difference between hot and cold galvanizing

There are two types of galvanized square tubes: hot-dip galvanized square tubes and electro-galvanized square tubes. There are wet method,
dry method, lead-zinc method, redox method and so on for hot-dip galvanized square tube. The main difference between different hot-dip galvanizing methods is the method used to activate the surface of the pipe body to improve the quality of galvanizing after the steel pipe is
pickled and cleaned. Dry method and oxidation-reduction method are mainly used in the current production, and their characteristics are shown in the table. The surface of the electro-galvanized zinc layer is very smooth and dense, with a uniform structure; it has good mechanical properties and corrosion resistance; the zinc consumption is 60% to 75% lower than that of hot-dip galvanizing. Electro-galvanizing is technically complicated, but it must be used for single-sided coating, double-sided coating with different thicknesses on the inner and outer surfaces, and thin-walled pipe galvanizing.
 

SIZE(mm)		SIZE(mm)
16×16×0.4~1.5	380×380×8.0~14.0	10×20×0.6~1.5	250×150×6~12.0
18×18×0.4~1.5	400×400×8.0~14.0	14×21×0.6~1.5	250×100×6~12.0
20×20×0.4~1.5	420×420×10.0~14.0	15×30×1.5~1.5	250×200×6~12.0
25×25×0.6~2.0	450×450×10.0~14.0	15×38×0.6~1.5	300×150×6~12.0
30×30×0.6~4.0	480×480×10.0~14.0	20×30×0.6~2.0	300×200×6~12.0
34×34×1.0~2.0	500×500×10.0~14.0	20×40×0.8~2.0	300×250×6~12.0
35×35×1.0~4.0		20×50×1.0~2.0	400×250×8~12.0
38×38×1.0~4.0	550×550×10.0~40.0	22×35×0.9~2.0	400×300×8~12.0
40×40×1.0~4.5	600×600×10.0~40.0	25×40×0.9~3.75	450×200×8~12.0
44×44×1.0~4.5	700×700×10.0~40.0	25×65×1.0~2.0	450×250×8~12.0
45×45×1.0~5.0	800×800×10.0~50.0	30×40×1.0~3.75	400×300×8~12.0
50×50×1.0~5.0	900×900×10.0~50.0	30×45×1.0~3.75	400×350×8~12.0
60×60×1.5~5.0	1000×1000×10.0~50.0	30×50×1.0~4.0	500×200×10~12.0
70×70×2.0~6.0		30×60×1.0~4.5	500×250×10~12.0
75×75×2.0~6.0		40×50×1.0~4.5	500×300×10~12.0
80×80×2.0~6.0		40×60×1.0~5.0	500×350×10~12.0
85×85×2.0~6.0		40×80×1.5~5.0	500×400×10~12.0
95×95×2.0~8.0		40×100×2.0~5.0	500×450×10~12.0
100×100×2.0~8.0		50×60×2.0~5.0
120×120×4.0~8.0		50×80×2.0~5.0	600×200×10~28.0
150×150×6.0~10.0		50×100×2.0~8.0	600×400×10~28.0
180×180×6.0~12.0		60×80×2.0~6.0	600×500×10~28.0
200×200×6.0~12.0		80×100×2.0~8.0	800×400×10~28.0
220×220×6.0~14.0		120×60×2.5~10.0	800×600×10~28.0
250×250×6.0~14.0		120×80×2.5~10.0	800×700×10~28.0
280×280×6.0~14.0		150×100×2.5~12.0	1000×400×10~28.0
300×300×8.0~14.0		180×150×2.5~12.0	1000×500×10~28.0
320×320×8.0~14.0		200×100×4~12.0	1000×600×10~28.0
350×350×8.0~14.0		200×150×4~12.0	1000×800×10~28

Product Application

Since the galvanized square tube is galvanized on the square tube, the application range of the galvanized square tube has been
 greatly expanded compared with the square tube. It is mainly used in curtain walls, construction, machinery manufacturing, steel
construction projects, shipbuilding, solar power generation brackets, steel structure engineering, power engineering, power plants,
agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, etc.

FAQ:

Q: Are you a manufacturer?
A: Yes, we are a manufacturer, we have our own factory. And we are China's leading Galvanized steel coil, Galvalume steel coil, PPGI/PPGL, etc. We promise that we are exactly the supplier you have been looking for. We welcome you to visit our factory to check our production lines and know more about our capacity, and quality.
Q: Do you have a quality control system?
A: Yes, we have ISO, BV, and SGS certifications and our own quality control laboratory.
Q: Can you arrange the shipment for us?
A: Yes, we have designated Sea Freight and Railway freight forwarders with decades of experience and we can get the best price with the earliest vessel and professional services.
Q: How long is your delivery time?
A: Generally it is 7-14 days if we have the exact goods in our stock. If not, it will take around 25-35 days to get goods ready for delivery.
Q: How do you keep long-term business and good relationships?
A: 1. We keep supplying good quality products and competitive prices to ensure our customers' benefit.
2. We think highly of every single customer of us and value the relationship, we take it not only as a business partner but also as true friends. Will keep the good services and put customers' benefit as a high priority.