Why Stainless Steel & Aluminium Are Good for CNC Machining

Why Stainless Steel & Aluminium Are Good for CNC Machining

CNC machining is a common manufacturing method which is used to manufacture parts and products. Parts are produced with the use of Computer Numerical Controls (CNC) - but deciding on which material to use can be a tough decision. Below is why stainless steel and aluminium being good for CNC machining.


Stainless steel


Stainless steel is defined as a steel alloy and as the name suggested it is a steel that should not corrode. It has a base element of iron and has chromium added which make it a corrosion-resistant alloy, an alloy being a mixture of metals.


While it is often thought of as corrosion-resistant there are many different grades of stainless steel that will determine its strength and corrosion resistance. To add to its characteristics a small amount of carbon is included which increases its strength and toughness.


Nickel can also be added to stabilise the crystalline structure of the iron, which will increase the integrity at all temperature extremes to assist with corrosion-resistance.


One of the biggest benefits of using stainless steel in CNC machining is that it is self-repairing after the machining opro9cess is complete., This is abchecied via process called passivation where the chromium forms an invisible layer over the iron to protect it from air and water. If the surface is scratched, the layer quickly rebuilds itself in the presence of oxygen.


This is the reason why high-quality stainless steel will not be susceptible to rust even if it is scratched during machining.




Aluminium is a durable metal which is soft, lightweight, and malleable making it perfect for CNC machining. While it has a dull grey appearance depending on the roughness of the surface it is a non-flammable substance and does not have any magnetic properties.


One of the main reasons why engineers choose aluminium for their machined parts is because, quite simply, the material is easy to machine. While this would appear to be more of a benefit for the machinist manufacturing the part, it also has significant benefits for the business ordering the part, as well as the end-user that will eventually use it.


Different aluminium grades differ greatly in their resistance to corrosion — the degree to which they can withstand oxidation and chemical damage. Fortunately, some of the most popular grades for CNC machining are the most resistant.


At Standish Engineering our specialist services include CNC Turning and Grinding, CNC Machining, CNC Milling. We can supply industries such as pharmaceutical, aerospace, and automotive with precision-engineered parts. For more information contact us today