Hot Sale Low Price Q235A Q235B Q345b Galvanized Square Hollow Steel Pipe Tube

• Customization: Available
• After-sales Service: Can Contact Seller Any Time
• Warranty: Can Contact Seller Any Time
• Model NO.: A36/A572/SS400/S235/S275/S355/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
• Length: 5-12m or as Your Requirement
• Delivery Time: Within 7-15 Days After Received Down Payment
• Oiled or Non-Oiled: Non-Oiled
• Invoicing: by Theoretical Weight
• Special Pipe: API Pipe, Other, EMT Pipe, Thick Wall Pipe
• 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 customer's request
Length	As 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, chromated, unoiled, dry
Packaging	seaworthy export standard package, or according to the customers'requirement
Delivery time	With 15 -25 days after receipt of deposit or L/C

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 carry out anti-corrosion, so it is necessary to ensure sufficient contact between zinc powder and steel to generate electrode potential difference, so the 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.

FAQ

1. Who are we?
We are based in Shandong, China, start from 2002,sell to Domestic Market(30.00%),South America(12.00%),Southeast Asia(7.00%),Africa(5.00%),Mid East(5.00%),Central America(2.00%),South Asia(2.00%),North America(10.00%),Western Europe(10.00%),Northern Europe(8.00%),Southern Europe(9.00%).

There are total about 101-200 people in our office.

2. How can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3.What can you buy from us?
Hot Rolled/ Cold Rolled Steel Plates/ Sheets,GI/ GL, PPGI/ PPGL, Corrugated Steel Sheets, Stainless Steel Coils/Sheets, Pipe, H-beam, I-beam

4. Why should you buy from us not from other suppliers?
1. 20 Year experience in Steel and Stainless Steel products.
2. Strong partners support from over 20 government belonging mills.
3. The most competitive price base on our huge annual sales quantity.
4. Fast delivery.

5. What services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,CIP,FCA;
Accepted Payment Currency:USD,EUR,CAD,HKD;
Accepted Payment Type: T/T,L/C,MoneyGram,Western Union,Cash;
Language Spoken:English,Chinese,Spanish,Arabic,Russian