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B&P Engineering Group
Stainless steel processing

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Stainless steel processing

At B&P Engineering we like to be challenged. One of the most difficult tasks, due to specific mechanical and physical properties of metals, is undoubtedly the processing of stainless steel. Particularly, stainless steel machining is associated with many difficulties that must be met by both the engineer responsible for preparing the machining project and the machine operator, who is the most responsible person for the final effect.

The offer of B&P Engineering in the field of stainless steel processing

With a modern machinery stock and dedicated staff possessing not only the expertise and the appropriate certificates, but also a vast experience in stainless steel processing, we can offer a range of services that will provide you the items with the desired properties, including dimensions and shape. On request, we can take care for your stainless-steel machining and other mechanical processing of stainless steel.

In the field of stainless steel machining we provide the following services:

• CNC milling [ list of owned milling machines ],

• CNC turning [ list of owned lathes ].

Additionally, under subcontracting scheme, we can perform the following:

  • welding,
  • laser cutting,
  • plasma cutting,
  • hydraulic guillotine cutting,
  • bending,
  • glass bead blasting,
  • electropolishing,
  • grinding.

We kindly encourage all parties interested in the cooperation with B&P Engineering to read the detailed information about the services we can provide you with. Modern machinery stock and the experienced staff enable us to carry out the tasks entrusted to us timely and in accordance with customers’ expectations. The cost of the service is always calculated individually as it depends on the quantity of workpieces to be ordered, the thickness and type of the raw material to be applied.

What are the specifics of stainless steel machining?

Stainless steel machining can be quite a challenge, as long as the manufacturer does not have the proper equipment and tools or if it does not employ certified specialists in the field of stainless steel welding.

Difficulties, especially in the machining of stainless steels, result primarily from: several times lower thermal conductivity, tendency to cure at crunching and engaging with the cutting tool, especially at its edge. Moreover, the more additives the alloy has, the more complicated the machining process is. Therefore, hard to machine are the austenitic and austenitic-ferritic alloys. The least problematic is the machining of stainless steel which belongs to the ferritic and martensitic group.

The solution applied at B&P Engineering is the use of special tools, which are dedicated to stainless steel processing, cooling and suitable lubricants. Furthermore, while selecting the cutting tools it is also important to consider their geometry as well as to adjust the pressure and milling speed to avoid sliding, as a result, blunting the edge of the tool. The proper selection of milling or turning tools, drill and using special additives and, above all, effective process of stainless steel machining.

Why is it so important to properly perform the machining of stainless steels?

Chrome contained in stainless steel reacts with the oxygen in the air and forms a chromium oxide layer on the steel surface, which in turns prevents further oxidation and, consequently, protects the metal from corrosion without the need of any additional protection.

Only maintaining the proper cleanliness guarantees the regeneration of the very important protective layer in case the raw material has been damaged. That is why, it is very important to use appropriate tools and materials, especially while grinding the surface. After that, the already machined part must be freed from all remains. For example, if we want to grind steel we avoid abrasives which contain chlorine, iron or sulphur. What is more, if we perform the mechanical processing of stainless steel we always pay attention whether the tools we want to use weren’t used before for the treatment of other steel grades. We are always careful not to bring the machined parts into direct contact with machines producing sparks which could permanently  damage the surface. 

What is actually stainless steel?

This group of materials includes alloy and non-alloy steel obtained through a special method of smelting. Contrary to normal steel the stainless steel is distinguished by its high purity as well as its characteristic reaction to heat treatment. It is widely used in the food, chemical, cosmetic and pharmaceutical industry as well as in the mechanics or various branches of heavy industry.

Due to alloy structure the high-alloyed stainless steel can be divided into following groups:

  • ferritic, containing approx. 11-13% or approx. 17% chromium,
  • austenitic (chromium-nickel), containing more than 8% of nickel,
  • austenitic-ferritic (Duplex), containing more than 30-60% ferrite,
  • martensitic, containing 12-18% of chromium and more than 0,1% carbon.