CARBON STEEL AND ITS APPLICATIONS
USE OF CARBON STEEL IN THE BRAZILIAN INDUSTRY
CONSULT BEST PRICE CONDITIONSCOMERCIAL@COMPRACO.COM.BR
Carbon steel sheets have become the best material for a diverse range of products. They are used to varying degrees on boats, buildings, bridges, storage tanks and pressure vessels. As carbon steel sheets can be manufactured to many chemical and physical requirements, they meet the needs of many types of applications.
PROPERTIES OF CARBON STEEL
Usable in a variety of cost-effective metal forming techniques (especially pressing), carbon steel is used in a wide variety of applications. These materials combine ease of production and adequate strength, as well as excellent characteristics that provide a good surface finish.
Carbon Steel can be divided into two main groups: Low Carbon Steel and High Carbon Steel.
The hardness or temper of cold rolled steel is determined by analysis, the volume of cold rolling or the application of a final annealing. These operations make it possible to obtain optimal mechanical properties for the forming operation, whether deep drawing, forming or flat cutting.
The skin pass treatment is a small reduction rolling after the annealing process to prevent the appearance of warping bands, which can ruin the appearance of the formed product.
Mild steels can only be hardened by hardening, as their carbon content is too low to cause significant heat treatment. However, they can be hardened to a harder surface.
Rolled carbon steels with a bright finish are often used in the annealed state to form components which are then heat treated in batches to increase their hardness and elasticity characteristics.
To maintain a suitable surface, heat treatment must be carried out in a controlled atmosphere oven, at a temperature adapted to the quantity and quenched with oil to obtain maximum hardness.
Immersion must then be carried out to reduce the strength/hardness of the material but significantly improve its hardness and conductivity. Temperatures in the range of 300 to 450 °C should be used to achieve the desired final hardness. Alternatively, bainitic quenching is often performed in a molten salt bath at 350-450 °C.
Hardened and Tempered
Hardened and tempered steel is processed into strip at the factory before being delivered to the customer. Many applications do not require extensive bending and forming and it is preferable in these cases to use tempered strips.
- no risk of distortion
- Uniformity of surface finish
- Constant mechanical properties
- These factors often imply a reduction in machining costs and a better quality product.
- Relaxation Annealing
After major deformation, the steel requires a low temperature annealing relaxation (250-300 °C) to fix the shape of the components. The metal will then have an oxidized color finish (blue bronze) which slightly improves corrosion resistance.