Shandong Kuaima  Steel Co., Ltd.



201 Stainless Square Pipe


Product Description

201 Stainless Square Pipe

201 Stainless Square Pipe

201 stainless steel square tube is commonly used steel or steel strip through the unit and mold curl forming and then welded into a steel pipe. Good overall performance, many varieties and specifications, good formability, can be used as equipment and machine parts.

201 stainless steel square tube connection methods are diverse: common types of pipe fittings are compression, compression, live joint, propulsion, push threaded, socket welding connection, welding and welding and traditional connection combined with the derivative series of connection methods. These connections, according to its principle, its scope of application is different, but most of them are easy to install, solid and reliable. Most of the sealing ring or gasket materials used for the connection are silicon rubber, nitrile rubber and EPDM rubber, which meet the requirements of national standards and eliminate the worries of users.


Stainless steel square tube is a kind of hollow long steel, because the section is square, it is called square tube. A large number of pipes are used for conveying fluids, such as oil, natural gas, water, gas, steam, etc. In addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures.


Stainless steel square pipe classification: square pipe is divided into two categories: seamless steel pipe and welded steel pipe (seamed pipe). According to the cross-sectional shape, it can be divided into square and rectangular pipes. The widely used round steel pipes are round steel pipes, but there are also some semicircular, hexagonal, equilateral triangle, octagonal and other special-shaped steel pipes.

For stainless steel square pipes under fluid pressure, hydraulic tests should be carried out to check their pressure resistance and quality. If there is no leakage, wetting or expansion under the specified pressure, it is qualified. Some steel pipes should be rolled according to standards or requirements of the buyer. Edge test, flaring test, flattening test, etc.

Square tube specification: 5*5~150*150 mm Thickness: 0.4~6.0 mm

Square tube material: 304, 304L, TP304, TP316L, 316, 316L, 316Ti, 321, 347H, 310S.

Production Process

Round bar preparation → heating → hot rolling and piercing → cutting head → pickling → grinding → lubrication → cold rolling → degreasing → solution heat treatment → straightening → pipe cutting → pickling → finished product inspection.

Performance Analysis

Metals can react with oxygen in the atmosphere to form an oxide film on the surface. The iron oxide formed on ordinary carbon steel will continue to oxidize, so that the rust will continue to expand, and eventually holes will be formed. This protects the carbon steel surface by electroplating with paint or oxidation-resistant metal, but this protective layer is only a thin film, and if the protective layer is destroyed, the underlying steel begins to rust again. Whether the stainless steel pipe is corroded is related to the chromium content in the steel. When the chromium content in the steel reaches 12%, in the atmosphere, a layer of passivation and dense chromium-rich oxide is formed on the surface of the stainless steel pipe to protect the surface, which can prevent further re-oxidation. This oxide layer is extremely thin, through which the natural luster of the steel surface can be seen, giving stainless steel a unique surface. If the chromium film is destroyed, the chromium in the steel and the oxygen in the atmosphere will regenerate a passive film, which will continue to play a protective role. In some special environments, stainless steel will also fail due to some local corrosion, but different from carbon steel, stainless steel will not fail due to uniform corrosion, so the corrosion allowance is meaningless for stainless steel pipes.



201 Stainless steel square tube

Product Name

201 Stainless Steel Square Pipe Manufacturer

Place of Origin


Brand Name





200 Series




According to customer needs


Brushed, Polished, Etched,etc.






Decoration,Food Grade,Petroleum, Chemical, Medical, Light Industry, Mechanical Instrumentation, etc.





Processing Service

Bending, Welding, Decoiling, Punching, Cutting, Moulding

Payment terms

L/C,T/T,D/P,etc.(According to customer needs)

Price Term


Product Show




Frequently Asked Questions


Q:What is your terms of payment?

A:We usually accept T/T in advance, L/C for large sum.If you prefer other payments terms, please discuss.

Q:What is the terms of delivery?
A:EXW, FOB, CIF,etc.

Q:What is the terms of packing?
A:Generally, we pack our goods in bundles or coils with rods or belts, we could also pack the goods as the customers' requirements.

Q:What is your delivery time?
A:For products in stock, we can ship it within 7 days after receiving the deposit.For custom order, production time is 15-30
workdays after received the deposit.

Q:Could you produce according to the samples?
A:Yes, we could customer-made by your samples or technique drawings, we could build the mold and fixtures.

Q:Can I place an sample order and what is your MOQ if I accept your quality?
A:Yes, we can send you samples but you may pay the express fees, our MOQ is 1 ton.

Q:How could you guarantee your products?
A:We accept and support the third-party inspection.We also could issue the warranty to customer to guarantee the quality.

Q:Where is the port of shipment?
A:Tianjin,Xiamen,Ningbo or Shanghai Port.

Q:How can I get the price of needed product?
A:It's the best way if you can send us the material, size and surface, so we can produce for u to check the quality.If you
still have any confusion, just contact us, we would like to be helpful.

Q:What other products do you make?
A: Stainless Steel Products, Galvanized  Steel Products, Color Coated Products, Alloy Steel Products, etc.

contact us

  • E-mail:Copy
  • Tel:+86-13370586666
  • Facebook:Facebook
  • Twitter:Twitter
  • Address:Liaocheng Economic and Technological Development Zone, Shandong Province, China

get in touch


  • subject

  • your request

Contact Info

Let's Connect With Us

We are ready to help at any stage of your project

  • E-mail:Copy

  • Tel:+86-13370586666

  • Facebook:Facebook

  • Twitter:Twitter