What type of flame should be used to cut carbon steel?

Using a neutral flame is essential for cutting carbon steel because it provides the ideal balance of oxygen and acetylene, which results in a flame that is neither excessive in oxidizing nor in carburizing effects. This balance is crucial, as it ensures that the flame does not introduce unwanted reactions with the steel, such as oxidation or excessive carbides that could weaken the metal.

The neutral flame typically has a defined inner cone and an outer envelope, where the inner cone reaches temperatures high enough for effective cutting, yet does not compromise the integrity of the steel being cut. This type of flame helps achieve clean cuts and prevents issues like warping or brittleness in the cut edges.

When cutting with an oxidizing flame, where there is too much oxygen present, there is a risk of excessive burning through the material, leading to a rough cut and potential damage to the material. A carbonizing flame, which has an excess of acetylene, can also lead to problems by essentially adding carbon to the steel, potentially resulting in overly brittle cuts or degraded material. An extra hot flame might suggest an intensification of heat without specificity to the needs of carbon steel, risking burns or quality issues. Thus, the neutral flame stands out as the most suitable and effective choice for this