Carbon Steel Seamless Steel Pipe API 5L High Quality

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25 m.t.
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10000 m.t./month

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Product Description:

Product Description:

1、Structure of Square Tube Description: 

    The square tubes are used in structural projects, shelves, racks, trailers and in ornamental purpose. The framework made by square steel tubes, is used for providing support to the roof. This framework is also used as roof top ventilation baffles. With compare to round steel tubes, square steel tubes are little more efficient. The reason is that the square column is more efficient than the solid circular column.

2、Main Features of the Square Tube: 

high quality and low peice 
quick delievry 
in stock 
produced by own factory 
authentication:CANS CNAB IAF PAC CEC 

3、Square Tube Images:

Square Tube with Low Price in China from

Square Tube with Low Price in China from

Square Tube with Low Price in China from

Packaging & Delivery

Packaging DetailsIn Bundles, Varnish coating, Ends can be bevelled or square cut, End capped.
Delivery Details10 days 

4、Square Tube Specification:

  • StandardJIS, GB, DIN, ASTM
    JIS G3445-2006, JIS G3444-2006, JIS G3446-2004, JIS G3441, GB/T 8163-1999, GB/T 8162-1999, DIN EN 10216-1-2004, DIN EN 10217-1-2005, DIN EN 10305, ASTM A106-2006, ASTM A53-2007, ASTM A789-2001, ANSI A213-2001, ASTM A179-1990
    Grade 10#-45#, Cr-Mo alloy, Mo, Q195-Q345, CrNi alloy
    10#, 20#, 45#, 15CrMo, 12CrMo, 13CrMo44, 12CrMo195, 16Mo, 16mo3, Q235, Q345, Q195, Q215, Cr17Ni8, 1Cr13Mn9Ni1N
    Outer Diameter15*15---80*80
    TechniqueHot Rolled
    Surface TreatmentCopper Coated
    Alloy Or NotNon-alloy

standard: ASTM JIS DIN GB 
size: O.D: 10*10——50*50 mm
          W.T: 1-50 mm

length: 6-12m or as request

packing: paint,bundles or for the clients’ needs

5、FAQ of Square Tube: 
①How is the quality of your products?

Our products are manufactured strictly according to national and internaional standard, and we take a test 
on every pipe before delivered out. If you want see our quality certifications and all kinds of testing report, please just ask us for it.
Guaranteed: If products’ quality don’t accord to discription as we give or the promise before you place order, we promise 100% refund.

②How about price?

Yes, we are factory and be able to give you lowest price below market one, and we have a policy that “ for saving time and absolutely honest business attitude, we quote as lowest as possible for any customer, and discount can be given according to quantity”,if you like bargain and factory price is not low enough as you think, just don’t waste your time.Please trust the quotation we would give you, it is professional one.

③Why should you chose us?

Chose happens because of quality, then price, We can give you both.Additionally, we can also offer professional products inquiry, products knowledge train(for agents), smooth goods delivery, exellent customer solution proposals.Our service formula: good quality+good price+good service=customer’s trust
SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem.



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Q:Is the same specification seamless steel pipe more expensive than welded pipe?
Seamless steel pipe having a hollow cross section, used as a conduit for conveying fluids, such as pipelines for transporting petroleum, natural gas, gas, water, and certain solid materials.
Q:What is the production process of seamless steel tube?
The main production process for hot rolling seamless steel tube (the main inspection):Tube preparation and check delta to billet heating, heating, rolling, perforated pipe, steel pipe and heat treatment, diameter (minus) Delta to finished tube straightening, finishing and inspection of delta (nondestructive, physicochemical, Taiwan inspection and warehousing)
Q:Seamless steel tube with the tube with what is the difference?
Of course, the market also has some use overall heating after drawing steel pipe joints or mandrel rolling seamless steel pipe, mainly in small size, only in the shape of this kind of pipe belongs to the seamless tube, it is not very good, pay attention to oh!!
Q:Seamless steel pipe and welded pipe what is the difference?
Identification method: see the inside of the pipe, because the external, will deal with the welded pipe is inside a gap, you can see some, some, is not easy to see, you can slowly by hand touch, or see the specifications are relatively thin, welded pipe
Q:How to identify stainless steel pipe and steel pipe?
Stainless steel (Stainless Steel) is referred to as the stainless steel, the resistance of air, steam, water and other weak corrosive medium or with stainless steel known as stainless steel; while the resistance to chemical corrosion (acid, alkali and salt chemical etching) corrosion of steel called acid resistant steel. Because of the difference in the chemical composition of the two, and make their corrosion resistance is different, ordinary stainless steel is generally not resistant to chemical medium corrosion, and acid resistant steel are generally stainless steel.
Q:Stainless steel tube, also known as why tube?
It can be divided into round tube and special-shaped tube according to the cross sectional shapeThe special-shaped tube has a rectangular tube, a rhombus tube, an elliptical tube, six square tubes, eight square tubes, various cross section asymmetric pipes, etc.
Q:How to establish a concrete-filled steel tubular column model in ANSYS?
A two unit model or a composite unit model can be adoptedTwo units are constructed of steel tubes and concreteA composite unit may be either a fiber element or a section conversion attribute
Q:20# seamless steel pipe and seamless steel pipe 20G what is the difference?
20#: low carbon steel seamless steel pipe, carbon steel is generally divided into low carbon steel, medium carbon steel and high carbon steel three, 45# steel in carbon steel, low carbon steel is lower than 45#, 45# is higher than that of high carbon steel, seamless steel pipe, such as no special requirements, using 20# seamless steel tube. 20# seamless steel pipe material is 20# steel, the strength is slightly higher than 15#, very little quenching, no temper brittleness. Cold plastic deformation and for bending, rolling, bending and hammer arch processing, arc welding and contact welding welding performance is good, when the thickness is small, prone to strict requirement of shape crack or complex shape parts. The cold or normalizing state of the cutting process is better than that of the annealed one. It is generally used to make workpieces with little stress and high toughness.
Q:How to make the internal tooth of the steel pipe?
Cylindrical thread can be used, if the tube is too long, you may consider a short tube with thread, and then welded to the long tube.Taper thread is more difficult to use than ordinary vehicle, and the tap is generally considered. The tap can be clamped on the tailstock.
Q:Is it good to buy a simple wardrobe or a steel pipe?
Natural nobility, if the quality and the degree of firmness, is the simple steel cloth cabinet is the best. However, because the texture of wood wardrobe, solid wood wood may be used after deformation.

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