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Thermal cutting

What is thermal cutting?

In the thermal cutting process steel is cut using extreme heat. Any form can be obtained from the plate of steel. Steel plates are cut to size by combusting (oxy-fuel cutting) or melting the material (plasma cutting). With oxy-fuel cutting the steel plate is heated to just below the melting point, using gas and oxygen. When adding extra oxygen, the steel starts to combust. Then the cutting process starts and can continue as long as oxygen is added. With plasma cutting the plasma melts the metal, creating a cut. During the cutting process iron oxide is released. A precise cut is created when the iron oxide is blown away with oxygen. The cutting machines Avezaat Staal uses have more than one torch to cut metal.


The thermal cutting process

The thermal cutting process consists of two phases. First, the steel plate is preheated using flammable gas. Then, pure oxygen is added to start combusting the steel. A clear cut is created. Due to an exothermic reaction the cutting process continues.


During the cutting process iron oxide is released. The melting point of iron oxide is lower than the melting point of steel. Therefore, iron oxide becomes liquid. The iron oxide is blown away from the cut using oxygen. When it cools down it becomes solid. This solid material can easily be removed after the cutting process.


It is important that the right amount of oxygen is added during the thermal cutting process. When there is not enough oxygen added, the cutting process will be slow and laboriously. While too much oxygen can cause a wide and hollowed cut.


Multiple thermal cutting processes

There are multiple thermal cutting processes. Oxy-fuel cutting and plasma cutting are two commonly used processes. Avezaat Staal applies oxy-fuel cutting and plasma cutting to cut steel on a large scale. For this they use a large CNC-cutting machine.


Thermal cutting at Avezaat Staal

Avezaat Staal uses thermal cutting to cut high and low alloy steel to size. Materials with a thickness from 3 to 600 millimeters can be cut. However, metals with a melting point lower than the combustion temperature cannot be cut using oxy-fuel cutting. Examples of these kinds of metals are aluminium and stainless steel. Plasma cutting can be a perfect alternative for oxy-fuel cutting depending on several product features.


Of course, rejuvenations, chamfers, and welding edges can be applied. Products can be delivered in raw or machined steel.


Avezaat Staal is certified according to ISO 9001:2015 by DNV-GL. They are authorized for remarking steel plates after cutting on base material with 3.1 or 3.2 certificate according to EN 10204:2004 on cut products. Hereby, costs are reduced, delivery times are shortened, and traceability is improved. Furthermore, Avezaat Staal possesses a certificated according to NEN-EN 2090-1, Execution class 4. This standard describes the requirements that are set for the way on which the quality of products is determined.


When products are prepared for delivery, the quality of each product is examined. The products are delivered at short notice throughout the Benelux. Rush orders are usually executed within 24 hours. If desired the products can be supplied with certificated from Lloyd’s, Bureau Veritas, Det Norske Veritas and American Bureau of Shipping.


More information or price request?

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Oxy-fuel cutting


Flame cutting contours


Flame cutting holes


Cutting thick steel


Plasma cutting