Tuesday, October 9, 2018

Understanding Hot Extrusion

Extrusion creates objects by pushing raw materials through a die to create complex cross-sections in
finished products, such as bars, tubes, or strips, and to improve the strength of metal construction or
manufacturing materials. The finished materials could be hollow or solid. It is one of the most common
methods of metal processing, though it can also be used with other types of raw materials.
How Hot Extrusion Works
Hot extrusion happens when the process takes place at a higher temperature than the metal or alloy’s
recrystallization temperature. This makes the process of pushing the material through a die easier.
How hot the metals must be depends on the specific metal. However, temperatures typically range
from 650°F for magnesium to 2,400°F for some types of steel. The exact temperature varies based on
many factors, including the final application.
Benefits of Hot Extrusion
Hot extrusion creates products with homogeneous properties that are of very high quality. This improves
the appearance and functionality of the finished product, as well as increasing the strength of the metals
(in most cases). The process of hot extrusion can save energy compared to cold extrusion processes,
where more force must be exerted onto the materials. It can also reduce material waste, which can
mean material savings, especially from large projects.

While hot extrusion may not be economically advantageous for small or very large batches, it might be
the most cost-effective option for medium to large volume projects. However, this largely depends on the
materials being rolled. Some types of steel produced in quantities over 50,000 pounds are more cost
effective using a hot extrusion process.
Disadvantages of Hot Extrusion
Hot extrusion is a more expensive process than other methods because of the upfront cost of the
required machinery as well as the cost of maintaining it. Some manufacturers may not offer hot extrusion
as a result. You may be required to pay more for parts created using hot extrusion rather than other

Additionally, the pressure range required for the process requires the use of lubrication. The heating
process could weaken the materials. Cold extrusion, as opposed to hot extrusion, may provide a better
surface finish. Under high heat, some metals can become oxidized, which could change the appearance
of the metal and increase friction, again requiring the use of lubrication. Which process is best will
depend on the raw materials and the final intended use of the products.

Ready to Get Started?

Atlas Bronze sells a range of engineered products for every industry, including made to order plates,
castings, and forgings. Check out our online store at www.atlasbronze.com to see what existing
products we sell or contact us for a quote on your custom project. Our expertise and experience can
help to ensure that you have access to the highest quality metal products for your project.

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