Ava Monroe
Steel cut nails are known for their durability and are commonly used in construction. They are made from steel plates heated to a reddish hue and fed into a nail-making machine. The process of making steel cut nails has evolved over time, from manual methods used by blacksmiths to automated machinery that can produce nails quickly and cheaply. Today, steel-wire nails are the most common type of nail, but understanding the process of creating steel cut nails provides insight into the history of nail-making and the development of construction techniques.
| Characteristics | Values |
|---|---|
| Materials | Steel, wrought iron, carbon |
| Tools | Hot cut, hardy, forge, anvil, guillotine, mechanical nail heading machine, gas forge, rotary cutter, nail machines |
| Process | Heating, cutting, hammering, welding, quenching, shearing, pounding, feeding, flipping, cutting off, reheating |
| Types | Common siding nails, cut spikes, hinge nails, clout nails, shingles nails, boat nails, brads, floor brads, oval brads, tacks, tintacks, box nails, duplex nails, drywall nails, finish nails, forged nails |
| Use Cases | Wood fences, siding over sheathing, heavy construction, planking, heavy timber, deck work, bridge work, antique hinges, face-nailing floors, box and crate construction, thin siding, paneling, furniture repair, cabinet work, batten doors, countertops, upholstery, shoe making, saddle manufacture, carpeting, fabric, paper, aluminium architectural metals |
| Properties | Durability, hard to pull out, strong holding power, corrosion resistance, light gauge, variation in head shape and length |
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What You'll Learn
Heat iron/steel and use a hot cut or hardy
To make steel cut nails, you'll need to heat your iron/steel in a forge. A forge is a type of hearth used for heating metals. For this project, a very hot fire is necessary to work with the wrought iron and perform a forge weld. Wrought iron has a grain structure similar to wood, and if it is not worked at very high temperatures, the fibers will shear apart and splinter. The ideal temperature for your forge fire is about 2800°F, at which point the metal will be white hot and goopy.
Once your forge is hot enough, you can heat your iron/steel in it and use either a hot cut or a hardy to cut it. A hot cut is a narrow chisel used for cutting into hot metal. A hardy is similar, but it fits into the square hardy hole of an anvil, so you don't need to hold it. You can use either of these tools to cut your heated iron/steel.
After cutting your iron/steel to the desired length, you'll need to hammer it out flat. Use precise hammer strikes on the edge of an anvil to define the head of the tool and start to draw out the handle. The tool will need steel on its face, as iron alone will not hold up to repeated use. You can use scrap steel for this, but be sure to cut it to fit the face of the header without any overhang, or the steel will overheat and crumble when you weld.
Once your tool is prepared, you can start to make nails. Heat the tip of your nail rod or drawn wire and hammer it out to a point. Pass a few nails through the header and break them off before starting full production.
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Hammer out the nail head
To make steel cut nails, you'll need a forge, a hot cut or hardy, and an anvil. You'll also require a bar of salvaged wrought iron, which will be heated in the forge and cut using either the hot cut or the hardy. The hot cut is a narrow chisel that cuts into hot metal, while the hardy fits into the anvil so you don't have to hold it separately.
Once you have your wrought iron bar, heat it in the forge until it's glowing orange. This will make it soft enough to work with. Now, use your hot cut or hardy to cut the bar to the desired length for your nails. You'll want to aim for a length of around 6 inches.
Next, you'll need to hammer the bar flat. Place the cut length of wrought iron on your anvil and use precise hammer strikes to flatten it out to approximately 1/2" x 1". This process will help you create the nail's head and draw out the handle.
Now, it's time to focus on the nail head. Using the edge of your anvil as a guide, strike the wrought iron with your hammer to define the shape of the nail head. Make sure you're using precise, controlled strikes to get the desired shape. This step is crucial in ensuring the final product looks like a nail.
At this stage, your nail head should be taking shape. You can continue refining its shape by hammering and drawing out the metal. Remember to work the metal when it's hot for the best results. If you're happy with the shape and size of the nail head, you can move on to the next step of creating the nail point and shaft.
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Flux the steel and let it cool
Fluxing is an essential step in the steel nail-making process. It involves applying a flux—a substance that removes oxides from the steel's surface—to the heated steel to prevent oxidation and improve the steel's wettability. In early American smithing, fine sand was often used as a flux. Today, there are several types of flux available, including liquid and paste forms.
When making steel cut nails, fluxing is typically done after heating the steel to an orange heat. The steel is then set aside to cool slowly, allowing the heat to penetrate the metal. Once the steel has cooled, it can be welded and shaped into nails.
The purpose of fluxing is to ensure that the steel surface is clean and free of oxides, which can interfere with the bonding process during soldering or welding. Fluxes are usually nearly inert at room temperature but become strongly reducing at elevated temperatures, allowing them to effectively remove oxidation.
It is important to note that some fluxes can be corrosive to metals, so it is crucial to clean the steel thoroughly after fluxing to prevent damage. Isopropyl alcohol is commonly used to remove flux residue and prevent corrosion.
By properly fluxing the steel and allowing it to cool, you create the optimal conditions for welding and ensure the final product's strength and durability. This step is a critical part of the nail-making process, and it contributes to the overall quality of the steel cut nails.
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Harden the nail with heat
To harden steel, you must heat it to its "critical temperature", which is usually between 800°C and 900°C. You can use a blowtorch or a small forge to do this. Keep the steel in the flame until it is evenly heated and glows red-hot. You can check if it is ready for quenching by using a magnet. Once the steel reaches its critical temperature, it will no longer be magnetic, indicating that it is ready for the next step.
The next step is to cool the steel quickly through a process called quenching, which locks in the hardness. The quenching medium can be either water or oil, depending on the type of steel. When steel is first submerged in oil, the heat from the treated steel and the quenchant form a layer of vapour, a process called firm boiling. As the temperature continues to drop, it moves into the liquid stage, and cooling slows down. This process helps to develop the properties within the steel to reach total hardness and reduce cracking and distortion of the finished tool.
After quenching, the steel is placed in an oven for about an hour, allowing the heat to relieve some of the internal stresses from the quenching process. The exact temperature and time for tempering will depend on the type of steel and the desired balance between hardness and toughness. Higher temperatures make the steel tougher but less hard, while lower temperatures preserve hardness but can make the steel less flexible.
Safety precautions must be taken when working with high temperatures. Always wear heat-resistant gloves and goggles, and ensure your workspace is well-ventilated, especially if you are using oil for quenching. Keep flammable materials away from your work area, and have a fire extinguisher nearby.
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Use old nail machines for unique nails
While modern nail-making is an industrial process, traditional nail-making was a skilled craft. A colonial blacksmith would use a bar of salvaged wrought iron, heating it in a forge and cutting it with a hot cut (a narrow chisel for hot metal) or a hardy (a similar tool that fits into the anvil so it doesn't need to be held). The blacksmith would then hammer the bar flat and use precise hammer strikes to define the head of the nail.
To create unique nails, an old nail-making machine can be used to follow this traditional process. Here are the steps to make steel-cut nails using an old nail-making machine:
Firstly, source a bar of salvaged wrought iron, which will serve as the raw material for your nails. Cut this bar into smaller pieces, approximately 6 inches long, using your old nail-making machine's cutting tools. Heat these bars in a forge until they are orange-hot, and then slowly bring them up to a welding heat. At this temperature, the iron will be soft enough to work with.
Use your nail-making machine's hammer to flatten the bars, and then shape them into nails using precise hammer strikes. To create unique nails, you can experiment with different head shapes and sizes by varying the angle and force of your hammer strikes. Ensure that you have the right steel face on your nail-making machine to withstand repeated use.
Once you are happy with the shape and size of your nails, it is important to harden them. Do this by fluxing the steel and allowing it to cool. Several fluxes are available, but fine sand was often used in early American smithing. Bring the iron up to welding heat again, and repeat the weld a couple of times to seal any gaps. Finally, punch a hole in the header of each nail, and your unique steel-cut nails are ready to use.
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