stainless steel tubing

Stainless steel pipe is a hollow long round steel, which is widely used in petroleum, chemical, medical, food, light industry, mechanical instrumentation and other industrial pipelines and mechanical structural parts.

In addition, when the bending and torsion strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. Also often used as furniture and kitchen utensils.


Stainless steel pipes generally use three hardness indexes, Brinell, Rockwell, and Vickers to measure their hardness.

Brinell hardness

Among the stainless steel pipe standards, Brinell hardness is the most widely used, and the hardness of the material is often expressed by the indentation diameter, which is both intuitive and convenient. But it is not suitable for steel pipes of harder or thinner steel.

Rockwell hardness

The Rockwell hardness test of stainless steel pipe is the same as the Brinell hardness test, which is the indentation test method. The difference is that it measures the depth of the indentation.

Rockwell hardness test is currently a widely used method, among which HRC is second only to Brinell hardness HB in steel pipe standards.

Rockwell hardness can be used to measure metal materials from very soft to very hard. It makes up for the difference of Brinell method. It is simpler than Brinell method. The hardness value can be read directly from the dial of the hardness machine.

However, due to its small indentation, the hardness value is not as accurate as the Brinell method.

Vickers hardness

The stainless steel tube Vickers hardness test is also an indentation test method, which can be used to determine the hardness of very thin metal materials and surface layers.

It has the main advantages of Brinell and Rockwell method, and overcomes their basic shortcomings, but it is not as simple as Rockwell method. Vickers method is rarely used in steel pipe standards.

Hardness testing

For stainless steel pipes with inner diameter above 6.0mm and wall thickness below 13mm, the W-B75 Webster hardness tester can be used. It is very fast and easy to test, and is suitable for fast and non-destructive qualification inspection of stainless steel pipes.

For stainless steel pipes with an inner diameter greater than 30mm and a wall thickness greater than 1.2mm, use Rockwell hardness tester to test HRB and HRC hardness.

For stainless steel pipes with an inner diameter greater than 30mm and a wall thickness less than 1.2mm, the surface Rockwell hardness tester is used to test the hardness of HRT or HRN.

For stainless steel pipes with an inner diameter of less than 0mm and greater than 4.8mm, use a special Rockwell hardness tester for pipes to test HR15T hardness.

When the inner diameter of the stainless steel pipe is greater than 26mm, the hardness of the inner wall of the pipe can also be tested with a Rockwell or surface Rockwell hardness tester.

Customer trusted us in materials good quality,enough quantity as well as competitive prices,we appreciate much on their commitments and trusts all the time.

On 1st of September,one of old customers from Turkey confirm a deal of 316 stainless steel pipe,size 3.05x76.1mm,6mtrs length,qty 22 tons,loading and shipping will be carried by 40GQ container.The customer needs tubes with bright surface,that drive us polish the tubes after cold drawn,which is not a simple procedure in polishing.Finally we achieved the job well by controlling the tubes under a fine prevision bright condition.With a minor tolerance in tubes OD,the buyer could use the tubes into precision facilities like food,sugar industry needed.


The 316 stainless steel pipe is widely used in higher level project or devices like in sea water facilities,heater,oven,seaside usage,salt etc.


Any same inquiry regarding 316 stainless steel pipe,plz send to us,as we are the exact supplier.


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