Flame Cutting: What It Is and When to Use It

Flame cutting services, also known as oxy-fuel cutting, is a process used to cut through thick sections of carbon and low alloy steels using a combination of oxygen and fuel gas.

This method is widely used across a range of heavy industries including construction, shipbuilding, mining, rail and engineering.

As steel profilerswith over 30 years experience working in the industry, we have created a guide explaining how flame cutting works, exploring its advantages and disadvantages, comparing it to plasma cutting and share when it might be the most suitable option for your business.

The Flame Cutting Process

Flame cutting uses a high-temperature flame to heat the metal to its ignition point before a stream of pure oxygen is applied to oxidise and blow away the molten material.

The process begins by preheating the metal with a torch until it reaches around 900°C. Once the material is hot enough, the oxygen jet is engaged to start the cutting process.

This method is particularly effective for cutting mild steel in thicknesses that range from 20mm to over 300mm. It is a reliable solution for heavy-duty steel profiling and is often used when working with structural components and large fabrications.

The Advantages of Flame Cutting

One of the main benefits of flame cutting is its ability to cut through thick materials that other methods struggle with. It is also a relatively low-cost process, both in terms of equipment and ongoing running costs.

The machinery is easy to operate and maintain, making it suitable for high-volume production work. Flame cutting is highly portable and can be used on-site, which is beneficial for large-scale projects where materials cannot be easily moved.

The Disadvantages of Flame Cutting

While flame cutting is ideal for certain tasks, it does have its limitations. It is not suitable for non-ferrous metals such as aluminium or stainless steel.

The process also generates significant heat, which can lead to a wider heat-affected zone and cause distortion in thinner materials.

The cut edge can be rougher compared to other methods and may require additional machining or grinding depending on the final use of the component.

Flame Cutting vs Plasma Cutting

Plasma cutting servicesuse an electrical arc combined with a gas to create a high-temperature plasma jet, which cuts through metals at speed. Plasma is more precise, creates a smaller HAZ and can cut a wider range of materials, including stainless steel and aluminium.

However, plasma machines tend to have higher operating and maintenance costs. For cutting thick carbon steel where speed and edge precision are not critical, flame cutting remains the preferred option.

When Should Businesses Opt for Flame Cutting?

Flame cutting is the right choice when working with thick carbon steel, particularly in structural and industrial applications where strength and durability are key. It is ideal for projects that require large-scale profiling without the need for ultra-precise edges.

At RMP Products, we offer expert flame cutting tailored to your exact specifications. With over 30 years of experience and a focus on quality and reliability, we support a wide range of industries with precision-cut profiles and fast turnaround times. Contact our teamfor a free quote today.