What type of material is typically used for marking metal?

Soapstone is widely regarded as the preferred material for marking metal due to its specific properties that suit the needs of metalworking. This soft, talc-based material leaves a clear, visible mark that can withstand the heat generated during processes like welding and cutting. Additionally, soapstone is durable enough to be used on various metal surfaces, while also being relatively easy to remove when necessary, unlike some other marking materials.

Chalk, while commonly utilized in other contexts, does not adhere well to metal surfaces and can easily rub off. Pencils may not produce distinct enough marks on metals due to the hardness of the metal surfaces. Markers, particularly permanent ones, can sometimes leave marks that are difficult to remove, and their ink might not handle the heat of metalworking processes as well as soapstone does. Thus, soapstone remains the go-to choice for creating reliable, visible marks on metal in the context of boilermaking and metal fabrication.