National standard low carbon square rectangular tube

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15 m.t.
Supply Capability:
9800 m.t./month

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Item specifice:

Standard: GB Technique: Cold Rolled,Cold Drawn,ERW,Forged,Saw,Extruded,EFW,Spring,Hot Rolled Shape: Square,Rectangular
Surface Treatment: Oiled,Black Steel Grade: Q195,Q215,Q235,Q215B,Q235B Thickness: 0-27
Length: 0-18m Net Weight: 0-10

Product Description:

1Structure of  National standard low carbon square rectangular tube: 

Square tube, square tube is a kind of call and rectangular tube, is equal and not equal to the length of steel pipe. Is the strip through the process of processing roll system. In general is the strip through the demolition of the package, flat, curly, welded to form a circular tube, and then rolled into a square tube and then cut into a square tube and then cut into the required length.


2‍‍Main Features of  National standard low carbon square rectangular tube:

• High manufacturing accuracy

• High strength

• Small inertia resistance

• Strong heat dissipation ability

• Good visual effect

• Reasonable price 


3 National standard low carbon square rectangular tube Specification




10#-45#, 16Mn

10#, 20#, 45#, 16Mn


1.5 - 25 mm

Section Shape

Square  and rectangular

Outer Diameter

20*20 mm-------400*400mm   20*30mm*300*500mm

Place of Origin

Tianjin, China (Mainland)



Outer Diameter

20*20 mm-------400*400mm   20*30mm*300*500mm


235B   345B 




1) Material:(ASTM A 106/A53 GRB.API5LGRB,GB,235B,345B

2) Specification range:OD: 20*30mm----300*500mm 20*20 mm---400*400mm    ,WT: 1.5 - 25 mm   ,length:3-12m or according to the requirement of clients.

3) Excutive standards:GB,ASME API5L.ASTM A 106/A53,Despite of the above
4) Surface:black lacquered,varnish coating or galvanized.
5) Ends:Beveled or square cut ,painted.
6) Packing:bundles wrapped with strong steel strip,seaworthy packing. 



4Packaging & Delivery

Packaging Details:

seaworthy package,bundles wrapped with strong steel strip

Delivery Detail:

15-30days after received 30%TT


5FAQ of  National standard low carbon square rectangular tube:  

How 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.

How 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.

Why 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.


6‍‍ National standard low carbon square rectangular tube Images ‍‍

National standard low carbon square rectangular tube

National standard low carbon square rectangular tube



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Q:How much is the tube?
The first prerequisite we need to determine is: what are the specifications of the steel pipe mentioned? Such as the commonly used steel pipe specifications: diameter 108*4.5, diameter 219*6, diameter 377*10, diameter and wall thickness of steel pipe with different specifications, different weight, so the steel price per meter is different.
Q:Is the same specification seamless steel pipe more expensive than welded pipe?
Welded steel pipe refers to the use of steel or steel plate bending deformation into a round, square and other shapes after welding into the surface of the joint of the steel pipe. The blank used in welded steel pipe is steel or strip steel.
Q:What type of steel pipe for security windows?
25 parties, 70 parties in general! Good point of about 90; 25/38 general 90, a good point of about 120! The model is usually 202. If 304 is used, it is usually multiplied by 2! Plastic steel window material is hard plastic! Inside a single glass lined steel prices have 75/90/120/150/ different brand price this is the price of the window! Aluminum alloy is generally 100/120/150/175/190 area, different prices different
Q:D108*4 what does "D108" mean by seamless steel tubes? What does "*4" mean?
D108: refers to the outer diameter of 108mm;4: refers to the wall thickness of 4mm.
Q:What's the actual size of the DN25?
Steel pipe production technology development began in the bicycle manufacturing industry rise, early nineteenth Century during the oil development, the two world war ships, boilers, aircraft manufacturing, manufacturing of power boiler after the Second World War, the development of chemical industry, petroleum and natural gas drilling and mining and transportation, are promoted in production the quality and variety, the development of steel tube industry.
Q:What are the lengths of scaffold steel tubes?
Scaffolding steel pipe standard length is 6 meters, for easy use, respectively, 6 meters, 3 meters, 2 meters, 1.5 meters, 1 meters, etc., if there is a special length, you need to intercept.
Q:What connections are there for concrete filled steel tubular column foundations?
Strengthening ring joint is a more common in the construction of steel pipe concrete column construction, it is to beam column connection through the upper and lower plate reinforcing ring bending force transmission way is through two to strengthen the uniform arrangement between the rings radial ribs and rib structure to connect with the ring the pipe wall at the top of the plate, so as to transfer the shear stress, so as to strengthen the thickness and improve the quality of connection engineering advantage. In the process of engineering construction, according to the construction principle of longitudinal reinforcement of Deng Qiang to control, so that the smaller width of not less than the replacement of the width of the connecting plate 70%, also need to be given due attention in the form of node selection
Q:Are steel tubes and round steel in weight or length when purchased?
The price must be measured by weight, and the length, volume and other specifications should be entered
Q:Seamless steel pipe 8162 and 8163 what is the difference?
8163 GB is fluid delivery tube, need to use eddy current detection, fluid transport, liquid, gas, solid, such as natural gas, water, gas, coal and stone, 8162 and 8163 of the popular point that is 8163 more than 8162 senior, 8163 inspection, 8162 inspection. I hope you understand!
Q:What's the difference between stainless steel seamless tube and stainless steel welded pipe?
Stainless steel seamless pipe featuresFirst, the product of the wall is thicker, it is more economical and practical, the wall thickness of the thinner, processing costs will be substantially increased it; secondly, the product process to determine its performance limitations, generally low precision seamless steel pipe: uneven thickness, tube inner surface brightness low and high cost of fixed length, and the inner surface pitting and black spots difficult to remove; the detection and plastic third, must be processed offline. Therefore, it has its advantages in high pressure, high strength, mechanical structure and timber.

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