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Q235b 200x200 Rectangular And Square Pipe/Tube

classifyProcess classificationSquare rectangular tube according to the production process: hot-rolled seamless square pipe, cold-drawn seamless square pipe, extruded seamless square pipe, welded square pipe. Among them, the welded square pipe is further divided into: 1. According to the process - arc welded square pipe, resistance welded square pipe (high frequency, low frequency), gas welded square pipe, furnace welded square pipe 2. According to the weld - straight seam welded square pipe, spiral welded square pipe.Material classificationSquare pipe according to material: carbon steel square tube, low alloy square tube. 1. Pu carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc. 2. Low alloy steel is divided into: Q345, 16Mn, Q390, ST52-3, etc.Production standard classificationSquare tube according to production standards: national standard square tube, Japanese standard square tube, imperial square tube, American standard square tube, European standard square tube, non-standard square tube.Cross-section shape classificationSquare tubes are classified by cross-sectional shape: 1. Simple cross-sectional square tube: square square tube, rectangular square tube. 2. Complex cross-sectional square tube: flower-shaped square tube, open-shaped square tube, corrugated square tube, special-shaped square tube.Surface treatment classificationSquare tubes are divided according to surface treatment: hot-dip galvanized square pipe, electro-galvanized square pipe, oiled square tube, pickling square tube.Classification of usesSquare pipes are classified according to their use: square pipes for decoration, square pipes for machine tools and equipment, square pipes for machinery industry, square pipes for chemical industry, square pipes for steel structures, square pipes for shipbuilding, square pipes for automobiles, square pipes for steel beams and columns, and square pipes for special purposes.Wall thickness classificationSquare rectangular tubes are classified according to wall thickness: ultra-thick wall square rectangular tube, thick-walled square rectangular tube and thin-walled square rectangular tube.
Special Pipe:
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Square rectangular pipe is a name for square pipe and rectangular pipe, that is, steel pipe with equal and unequal side length. It is made of strip and rolled by process treatment. Generally, the strip is unpacked, flattened, curled, welded to form a round tube, and then rolled into a square tube from the round pipe and then cut to the required length.
Product introduction
Also known as square and rectangular cold-formed hollow section steel, referred to as square pipe and rectangular tube, code F and J respectively 1. The allowable deviation of the wall thickness of the square rectangular tube shall not exceed plus or minus 10% of the nominal wall thickness when the wall thickness is not more than 10mm, plus or minus 8% of the wall thickness when the wall thickness is greater than 10mm, except for the wall thickness of the corner and weld area. 2. The usual delivery length of square rectangular tube is 4000mm-12000mm, mostly 6000mm and 12000mm. The square rectangular tube is allowed to deliver short and non-fixed length products not less than 2000mm, and can also be delivered in the form of interface tubes, but the demander should cut off the interface tube when using it. The weight of short and non-fixed length products should not exceed 5% of the total delivery quantity, and the square rectangular tube with a theoretical weight greater than 20kg/m should not exceed 10% of the total delivery quantity 3. The bending degree of the square rectangular tube shall not be greater than 2mm per meter, and the total bending degree shall not be greater than 0.2% of the total length

useApplication fields: widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobile industry, railways, highway guardrails, container skeletons, furniture, decoration and steel structure fields. Used in engineering buildings, glass curtain walls, door and window decoration, steel structures, guardrails, machinery manufacturing, automobile manufacturing, home appliance manufacturing, shipbuilding, container manufacturing, electric power, agricultural construction, agricultural greenhouses, bicycle racks, motorcycle racks, shelves, fitness equipment, leisure and travel supplies, steel furniture, various specifications of oil casing, oil pipes and line pipes, water, gas, sewage, air, heating and other fluid transportation, fire fighting and support, construction industry, etc.

Packaging details
1.Big order: in bulk
2.Small order: packed by steel strips
3.woven cloth with 7 slats
4.according to the requirements of customers
5. 20ft container can load 25 tons, 40ft container can load 26 tons.
Delivery3-15 working days after received the deposit or L/C.
Payment terms

30% TT deposit, 70% balance before shipment.        

Q1: Are you trading company or manufacturer ?
  A: We are processing factory. Our factory locates in Songjiang Steel City. If you would like to visit our factory, just inform us in advance, we will pick you up at the airport. we warmly welcome all of our clients to visit us.

Q2: How long is your delivery time?
  A: Generally, it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

Q3: What is your terms of payment?
  A: T/T 30% as deposit, and 70% before delivery. We'll show you the photos of the products and packages before you pay the balance.

Q4: What is your terms of delivery?

Q5: Can you produce according to the samples?
  A: Yes, we can produce by your samples or technical drawings. We can build the molds and fixtures.

Q6: What is your sample policy?
  A: We can supply the free sample if we have ready parts in stock, but the customers have to pay the courier cost.

Q7: Do you test all your goods before delivery?
  A: Yes, we have 100% test before delivery

Q8: How do you make our business long-term and good relationship?
  A: 1. We keep good quality and competitive price to ensure our customers benefit .
      2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from.



Shanghai Changzeng Metal Co., Ltd. was established in 2006. It is a professional steel factory in Shanghai. We mainly sell angle steel, H beam, steel channel, round steel, square steel, steel wire, PPGI coil and so on.
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