In the JIS G4051-2005 standard, s20c material has high cold deformation plasticity. Generally used for bending, calendering, bending and hammer arching. Its carbon content is about 0.20%, and it is often used for carburizing and tempering to improve surface hardness and increase wear resistance. For hot rolled s20c, the thickness is generally from 2.0mm to 12.0mm.
In the production of conventional parts, the flatness requirements of S20C steel are not high, as long as a good structure can be formed, and even a slight roller polishing and other processes are used in the later stage to make the surface bright and easy to paint.
Recently, we have a user who is looking for ±0.03mm to our factory when using s20c steel coil. I want to order s20c, 1.5mm thickness with a width of 118mm, a length of 1250m, and a tolerance of 1.5mm within plus or minus 0.03mm. This is basically the advantage of our s20c cold-rolled steel strip manufacturer. In addition, the customer also put forward a requirement for flatness. The value given at that time was flatness <0.1mm, which was a big challenge.
To ensure product quality, Baosteel's s20c steel coil was first selected, and the thickness was also thicker than before. In the cold rolling and rolling process of s20c, an additional annealing and finishing is added to ensure that the s20c steel strip can eliminate the deformation factors such as middle wave and edge wave as much as possible. Because it involves the cold-rolled steel strip to be flattened, a flattening process is involved here. The difference between the technology at that time was the high hardness. At hrb85 degrees, the flatness will be better.
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