| Payment Type: | L/C,T/T,D/P,D/A |
| Incoterm: | FOB,CFR,CIF,EXW,DDP,DDU |
| Min. Order: | 5 Ton |
| Transportation: | Ocean,Land,Air,Express |
Brand: CHANGYI
Standard: Aisi, Astm, Bs, Din, Gb, Jis
Place Of Origin: China
Production Process: Hot Rolled
Tolerance: ±1%
Processing Service: Bending, Welding, Decoiling, Punching, Cutting
Whether Alloy: Unalloyed
Application: Fluid pipes, boiler pipes, drill pipes, hydraulic pipes, gas pipes, oil pipes, fertilizer pipes, structural pipes
Special Pipes: API pipe, thick wall pipe
Outer Diameter: 19 - 660mm, or customized
Thickness: 1.24 - 59.24mm or customized
Length: 12M, 6m, 6.4M, 1-6m or as your request
Surface Treatment: galvanized
| Selling Units | : | Ton |
| Package Type | : | Standard Shipping Packing |
| Picture Example | : |
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PRODUCT DESCRIPTION
Galvanized square tubes are divided into hot-dip galvanized square tubes and cold-dip galvanized square tubes from the production process.
Hot dip galvanized square tube
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.
Product Details
| Thickness | 0.5-8mm；or as required | ||||||||
| Dimensions | 10-3000mm；(1/2inch~40inch)Dimensions | ||||||||
| Length: | 2000-12000mm，or as required | ||||||||
| Technique | Hot Rolled | ||||||||
| Standard: | ASTM，JIS，GB，DIN，EN | ||||||||
| Payment Terms | T/T, L/C at sight,West Union | ||||||||
| Heat Treatment | Annealed; Quenched; Tempered | ||||||||
| Certification: | CE, ISO, SGS，BV，Mill Certificate | ||||||||
| price terms | FOB,CFR,CIF,EXW, CPT | ||||||||
| Grade | Q195—Grade B, SS330, SPC, S185Q215—Grade C,CS Type B, SS330, SPHC，Q235—Grade D, SS400, S235JR, S235JO, S235J2，Q345—SS500, ST52，S355JR | ||||||||
| Delivery Detail | Standard has Stock; Normal About 3-5days; Custom-made 15-20days；According to order’s quantity. | ||||||||
| Packing | standard export packing (inside:water proof paper,outside:fumigated wooden box)Hexagon Shape Bundle, Covered With Tarpaulin, Containers Or In Bulk | ||||||||
| Steel grade | GB | JIS | ASTM | DIN | |||
| Brand | Brand | Brand | Steel number | Steel number | Material number | Standard | |
| Carbon | (Q235) | GGP | G3452 | (A53- F) | (St33) | 1.0033 | DIN1626 |
| Steel pipe | STPY41 | G3457 | A283-D | ||||
| 10 | STPG38 | G3454 | A135-A | (St37) | 1.011 | DIN1626 | |
| A53-A | |||||||
| STPG38 | G3456 | A106-A | St37-2 | 1.0112 | DIN17175 | ||
| STS38 | G3455 | St35.8 | 1.0305 | DIN1629/4 | |||
| St35.4 | 1.0309 | ||||||
| STB30 | G3461 | A179-C | St35.8 | 1.0305 | DIN17175 | ||
| A214-C | |||||||
| STB33 | G3461 | A192 | St35.8 | 1.0305 | DIN17175 | ||
| A226 | |||||||
| STB35 | G3461 | St35.8 | 1.0305 | DIN17175 | |||
| 20 | STPG42 | G3454 | A315-B | (St42) | 1.013 | DIN1626 | |
| A53-B | St42-2 | 1.0132 | |||||
| STPT42 | G3456 | A106-B | St45-8 | 1.0405 | DIN17175 | ||
| STB42 | G3461 | A106-B | St45-8 | 1.0405 | DIN17175 | ||
| STS42 | G3455 | A178-C | St45-4 | 1.0309 | DIN1629/4 | ||
| A210-A-1 | |||||||
| Low alloy | 16Mn | STS49 | G3455 | A210-C | St52.4 | 1.0832 | DIN1629/4 |
| Steel pipe | STPT49 | G3456 | St52 | 1.0831 | DIN1629/3 | ||
FAQ
Q:Can I get samples before order ?
A:Yes, of course. Usually our samples are free,we can produce by your samples or technical drawings.
Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.
Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.
Q:Does the product have quality inspection before loading?
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we accept third party inspection.
Q:How do we trust your company?
A:We specialise in steel business for years, headquarter locates in Liaocheng, Shandong province, you are welcome to investigate in any ways, by all means, we have CE and ISO9001 certificate, quality can be guaranteed.
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