FAQs About Knife Forging

Forging a knife is a task that requires an investment of time and care to prevent burns and injury. These FAQs look at questions common to the forging process.

Q: What materials are needed to forge a knife?

A: A forge to provide heat, an anvil and hammer to shape the knife blade and a high-quality steel are the materials required to forge a knife. To supply heat within the forge, a source of fuel, such as coal or propane, is needed; coal is the preferred fuel among many blacksmiths but is often subject to wildly fluctuating market prices. Tongs are also recommended, since the forging process greatly heats up the steel used to craft the knife, and a fire blanket is useful for cooling and finishing the final blade.

Q: What is the best way to shape a blade?

A: Hammering a notch into one end of the steel provides a handy support for tongs, and when the knife is complete, the handle is attached at the tong end. With the tongs attached, applying heat and using an anvil and hammer allows for the steel to taper from the tong end to a narrow point at the opposing end of the steel bar. Once the general shape of the knife is created, the blade is hammered to create an edge for sharpening later.

Q: What additional steps are needed prior to cooling?

A: The forging process heats the steel to varying temperatures along the length of the blade, which forms stress within the steel. To create a knife with consistent strength, it is necessary to de-stress the blade. This step is accomplished by heating the entire blade, from tong end to point, to around 750 degrees Celsius and allowing it to cool to the touch. After the first cooling, reheat the blade again to 750 degrees, and hammer out any warps within the steel. Once the final hammering of the blade takes place, reheat to 770 degrees and wrap within a fire blanket. After wrapping the knife, place in a safe location, allowing the steel to cool for 18 hours.

Q: How is the blade finally cooled?

A: After the blade is heated, re-hammered and allowed to cool for 18 hours, final hardening occurs by quenching the blade in a lukewarm water bath. After the blade is cooled, the blade edge is sharpened using a sharpening stone.