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Zhejiang Yihong stainless steel pipeline equipment Co., Ltd! EN

  one   Sanitary stainless steel pipe summary      


The main difference between sanitary stainless steel pipe and ordinary stainless steel pipe is that the internal surface is polished, which can reduce the resistance and increase the fluidity when conveying the fluid, which makes the pipe wall debris peeled off due to fluid impact in the fluid, and makes the inner wall of the steel pipe not easy to scale, so as to ensure the health and safety. In addition, it has the characteristics of high precision, good surface finish, uniform pipe wall, corrosion resistance, temperature resistance, etc.


2. Application cases


Sanitary stainless steel pipe is often used in pharmaceutical factory, food factory, beverage factory, brewery and so on.

At the same time, some corresponding sanitary equipment also need to use sanitary stainless steel pipe, such as water purification equipment, water circulation system, fermentation tank, etc. With the improvement of people's life quality, water purification equipment has gradually entered people's daily life. In order to avoid secondary pollution of water quality, sanitary stainless steel pipe is also widely used as the shell of water purifier.



      The company is a professional Stainless steel pipe manufacturer We supply all kinds of sanitary stainless steel pipe, stainless steel sanitary pipe, fluid pipe, sanitary mirror tube, sanitary seamless tube, food grade stainless steel, stainless steel seamless sanitary tube, stainless steel finish rolling pipe, etc.


      The company with its integrity, pragmatic, innovation, technology and other advantages, laid a leading position in the stainless steel market. All the products have SGS report and material certificate of RoHS directive. They have obtained American API logo and Japanese JIS certificate, and passed ISO9001 and IS09002 international quality system certification.


 Stainless steel sanitary pipe (Fig. 1)

304 stainless steel sanitary pipe


Stainless steel sanitary pipe Product features (high, fine, specialized)


High: high precision, high finish, outer diameter tolerance ± 05, the wall thickness tolerance can also be achieved ± 0.05mm, sometimes up to 0.05mm ± 03mm, and the tolerance of inner hole dimension is strictly controlled ± 0.03, less than 0.02-0.05mm, internal and external surface finish RA 0.8 μ After polishing, the surface finish of the tube can reach RA 0.2-0.4 μ M (e.g. mirror)


If customers have external surface requirements, even up to 0.1 or even 8K surface finish: precision size, precision product size, precision are at a very high level.


Generally, as long as it is not thick wall, large diameter stainless steel sanitary pipe. The tolerance of outer diameter, wall thickness and inner hole can be basically controlled within ± Within 0.05mm, of course, sometimes even higher.


In the production of stainless steel tube Several key equipment:

 

1. Cold drawing machine: round steel is called raw pipe after perforation Ф 65 * 5mm or Ф 100*7mm。 Sanitary stainless steel pipe for general industrial use Ф 14 * 1mm to Ф 200 * 3mm, which needs to be expanded and pulled by a cold drawing machine. Sometimes it is necessary to expand the tube or pull the small tube several times, and the annealing (heat treatment) and pickling cycle are carried out.  

There are many types and specifications of cold drawing machine and mandrel, which are not described.  


The main advantages of cold drawing are: high production efficiency; It is convenient and flexible to change product specifications in production; The equipment and manufacture of the tools and the structure maintenance of the equipment are relatively simple.  

The main disadvantages of cold drawing are: small pass deformation, so more processing passes and long production cycle; High metal consumption. The internal and external surface finish of the pipe is poor.  


2. Multi roll cold rolling mill: it is the key equipment for manufacturing sanitary seamless stainless steel pipe in China. Taking the cold drawn steel pipe as the blank, the inner and outer diameter and wall thickness of the cold-rolled pipe are less than 0.02-0.05mm, and the surface finish RA ≤ 0.8 μ m. It can be made to a wall thickness of 0.5mm. After polishing, the internal and external surface finish of the tube can reach RA ≤ 0.2-0.4 μ M (e.g. mirror).  


There are many types and specifications of multi roll cold rolling mill, and many types and specifications of mandrel are not described.  

The defect of cold rolled tube is hard state, that is, the yield strength coefficient is large, so it is not suitable to expand and bend. Strictly speaking, it still does not meet the standard. Therefore, it is necessary to carry out hot solid fusion treatment (annealing).  


    Generally speaking, after the stainless steel pipe is treated by ordinary thermosetting treatment furnace (milk stove), the oxide skin appears on the inner and outer surface of the pipe, which needs acid pickling, which destroys the internal and external surface finish of the original cold-rolled pipe, and appears small unevenness, which can not meet the surface finish standard of sanitary grade pipe. Therefore, it is necessary to choose gas protection bright annealing furnace


three hundred and four Sanitary stainless steel pipe GB / t14976-2012 standard


1. High dimensional accuracy, good internal and external surface finish

2. This kind of pipeline is mainly used in equipment manufacturing

3. The length of the stock is not fixed, 5-7 is generally available, and the specification is not easy to be restricted.

4. Packaging and transportation is generally woven bag packaging, some customers require wooden box packaging and transportation.

5. Compared with welded sanitary pipe, sanitary seamless pipe has a longer customization period, generally about 15 days

6. The starting order is generally 500kg, detailed telephone consultation.


304 sanitary stainless steel pipe GB / t14976-2012 standard:


First, the thicker the wall thickness of stainless steel sanitary pipe, the more economical and practical it will be. The thinner the wall thickness is, the higher the processing cost will be;


Secondly, the process of stainless steel sanitary pipe determines its limited performance. Generally, the precision of seamless steel pipe is low: the wall thickness is uneven, the surface brightness inside and outside of the pipe is low, the cost of sizing is high, and there are pockmarks and black spots on the internal and external surface, which are not easy to remove;


 Stainless steel sanitary pipe (Fig. 2)

316 sanitary stainless steel seamless pipe


 Stainless steel mirror tube (Fig. 2)

304 stainless steel finishing pipe


 Stainless steel mirror tube (Fig. 3)

Stainless steel sanitary pipe


 Stainless steel sanitary pipe (Fig. 2)

304 sanitary stainless steel pipe


 Stainless steel sanitary pipe (Fig. 3)

Sanitary stainless steel fittings

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