Rimmed steel is a low carbon steel that is easily bent and has a clean surface. It is partially deoxidized, allowing a circle to form that is almost entirely iron. It is softer than other steels and ideal for cold bending and rolling applications. The surface finish is cleaner and it is used for its aesthetic properties. It is not recommended for hot bending. Blowholes may appear during forming, but are removed during rolling. It uses only 0.15% to 0.25% carbon and is valued more for being easy to work with than for its strength and durability.
Rimmed steel is a type of low carbon steel that has a clean surface and is easily bent. When steel is normally produced, it is completely deoxidized; with rimmed steel, the steel is only partially deoxidized, which allows for a circle to form. This circle is almost completely devoid of other elements and is mainly made of iron. There is less carbon, so this steel is softer than other grades, making it ideal for cold bending and rolling applications. Of all the low carbon steels, rimmed steel is one of the most common.
When steel is created, the metallurgist uses a flux to remove the oxygen from the iron and the carbon to create the steel. If the desired product is rimmed steel, the deoxidation is only partial, which allows the ingot to remain liquid. During this time, a rim is formed around the ingot that contains fewer impurities than the central area. Impurities, such as carbon and manganese, are held in the center, while the rim is almost entirely iron. This means that the core has more impurities than most steels, while the outside has fewer impurities than most steels.
Rimmed steel uses less carbon than other types of steel, so it’s much softer than other steels. This means that projects that require metals that are easily machinable or bendable use rimmed metal. It is easily rolled up and can be cold folded and cold formed. The surface finish is also much cleaner than that of other steels, so it is used for its aesthetic properties and low roughness. Using this steel in hot bending and other hot processes is actually not recommended, because the alloy materials and impurities are not uniform, which can cause problems.
While rimmed steel is known for its good surface quality, the quality is generally poor during the forming of the steel. The way the circle is formed causes blowholes to appear on the surface of the steel as the materials move outward and deoxidize. These holes are removed during the rolling process to make the metal surface smooth and clean.
Rimmed steel is considered a low carbon steel. Most steels use about 1% to 2% carbon alloyed with iron. The rimmed variety uses only 0.15% to 0.25% carbon. Most steels made with 0.15% carbon are this type of steel, because it is valued more for being easy to work with than for its strength and durability.
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