O aço de baixo carbono também é identificado como aço macio. Hoje, onde quer que você esteja – dirigindo um carro, usando um eletrodoméstico, or taking a walk around a modern city – you are surrounded by objects that are made from mild steel. Neste artigo, we will look at why mild steel is so popular, look at its features, its uses, how it can be produced, and the most popular grades that are available on the market today.
What is Mild Steel?
Mild steel is a type of carbon steel that normally has a low carbon content. Geralmente, it contains carbon content in the range of 0.05% e 0.25%. These slight additions make it more malleable and easier to work as compared to the higher carbon steels while at the same time possessing relatively high tensile strength. Portanto, it’s often used in construction, the automotive industry, and in the making of machinery.
Mesa: Key Properties of Mild Steel
The properties of mild steel are divided into chemical, físico, e categorias mecânicas, which make it unique for its applications.
| Propriedades físicas | Propriedades quimicas | Propriedades mecânicas |
| Densidade: 7.85 g/cm³ | Conteúdo de carbono: 0.05% – 0.25% | Resistência à tracção: 400-550 MPa |
| Ponto de fusão: 1450°C -1800°C | Conteúdo de Ferro: 98.0% – 99.0% | Força de rendimento: 250 MPa |
| Condutividade elétrica: 10.4 x 10^6 S/m | Manganês: 0.4% – 0.7% | Dureza (Brinell): 120-170 HB |
| Condutividade térmica: 51.9 S/m·K | Sulfur: ≤ 0.05% | Alongamento (Ductilidade): 15-20% |
| Propriedades Magnéticas: Ferromagnetic | Phosphorus: ≤ 0.04% | Módulo de Elasticidade: 200 GPa |
List of Some of the Most Frequently Used Grades of Mild Steel Avail in the Market
Mild steel comes in different grades. Each type is slightly different from the other to meet a specific need. The most common grades include:
1. ASTM A36
ASTM A36 is one of the most utilized mild steel grades used in industries today. It has excellent formability and is employed in construction uses such as structural beams and sheets. Além disso, it is relatively easy to fabricate and can be readily welded in any ordinary method.
2. EN1A
EN1 is optimal for the production of small and accurate products such as screws and fasteners because of its high machinability. While it has comparatively low tensile strength, it is easy to be machined and formed.
3. S275
S275 mild steel is employed for different structural purposes for instance in the construction of bridges, and buildings among others. Compared to the ASTM A36, S275 has more strength and therefore can be used in Civil Engineering constructions.
4. S355
S355 is known as structural-grade steel. Tipicamente, available in large quantities in the European region. It offers more tensile strength than other mild steel grades and is thus suitable for structures such as cranes, quadros, and offshore structures.
These grades are selected based on the need of the application, this may be higher strength, better formability, or better machinability.
Uses of Mild Steel in Different Sectors
Low carbon steel is also referred to as mild steel and is well known for its versatility and affordability as well as hardness and strength. Here’s an in-depth look at how mild steel is utilized across various technical domains:
1. Construction and Infrastructure
MS is one of the most used materials in construction due to its ductility, ease of fabrication, and strength it can easily take loads and stresses.
- Structural Beams and Columns: In high-rise buildings and bridges, structural beams and columns are made up of mild steel. It is malleable and can therefore take and distribute loads well thus maintaining structures’ stability and solidity.
- Reinforcement Bars (Rebars): These are bars made of mild steel that are placed within the concrete to increase tensile strength and minimize the possibility of cracking. The bond between the steel and concrete is very strong thus making structures made of reinforced concrete to be very durable.
- Welded Frameworks: Mild steel provides high weldability, and this makes it possible to create several frameworks and joints in the construction of both homes and business entities.
2. Indústria automobilística
Mild steel is used in automotive manufacturing to come up with strong but relatively cheaper auto parts needed in the manufacturing of automobiles.
- Chassis and Body Panels: Mild steel has better formability to produce vehicle chassis and body panels that are strong and at the same time lightweight. This helps to enhance the safety and performance of vehicles on the road while at the same time ensuring that the cost of production remains low.
- Exhaust Systems: This material can withstand high temperatures and can easily be machined and this makes it suitable for manufacturing exhaust systems which are usually coated for corrosion resistance.
- Engine Components: Brackets and mounts made of mild steel are used for engine assemblies since they must uphold structures and support operations under different conditions.
3. Manufacturing of Pipelines
Mild steel is considered to be ideal to use when constructing pipeline systems because of its strength and flexibility especially when it comes to pressure.
- Oil and Gas Pipelines: The material is applied in the construction of pipelines for the transportation of both oil and natural gas over large distances. Two of these properties, namely the ability of the material to resist internal pressures and its weldability are important for pipeline integrity.
- Water and Sewage Systems: Mild steel pipelines are used in the municipal water supply and sewage systems. These pipes are however coated to improve their anti-corrosive features and to increase their service span.
4. Shipbuilding and Marine Applications
Mild steel is widely used in the shipbuilding industry because of its strength, and ability to withstand shock.
- Ship Hulls: The hulls of large ships and tankers are made of mild steel and this is to provide the necessary rigidity for long voyages at sea.
- Ship Decks and Bulkheads: This material is used in making bulkheads and decks where stresses as well as exposure to marine environments are expected.
5. Energy and Power Generation
Mild steel is widely used in the energy and power industry since its characteristics correspond to the requirements of the equipment used in this industry.
- Wind Turbines: The blades of the wind turbines are normally built using mild steel since they are tall and bear considerable loads.
- Electrical Transmission Towers: Transmission towers for use in carrying heavy cables for electrical distribution are created through mild steel.
- Power Plant Infrastructure: Boilers, pipelines, and other apparatuses used in power plants are made from mild steel due to their durability at high temperatures.
Conclusão
Low-carbon steel is also known as mild steel. It has the desirable combination of properties and is often used in the construction, automotivo, and machinery industries. It is therefore important to know the properties, the different grades, and uses of stainless steel. So that appropriate decisions can be made concerning its use in projects. When it comes to structural elements and everyday items, mild steel remains the go-to material in today’s production lines.
Perguntas frequentes
1º trimestre. What is the difference between mild steel and high-carbon steel?
Mild steel has a carbon content which is ranging between 0.05% para 0.25 %. But high-carbon steel has carbon ranging from 0.6% para 1.5%. This difference has an impact on their characteristics. Mild steel is more flexible, easily soldered, and forged. High carbon contains high tensile strength and is more liable to fracture.
2º trimestre. How does mild steel rust?
Mild steel rusts. Because it has iron which combines with oxygen and moisture. It presents in the environment to form iron oxide layers. Mild steel, por outro lado, is protected from rusting by painting, oiling, or by the application of other coverings.
3º trimestre. Is it possible to heat-treat mild steel?
Sim, mild steel can be heat-treated. No entanto, the changes in properties observed are not very significant compared to high-carbon steel. It can be made more machinable using methods such as annealing. Além disso, it can be made harder on the surface using processes like case hardening.
4º trimestre. Can mild steel be used in high-stress applications?
Mild steel is notably useful for structural and mechanical uses. No entanto, it may not be suitable for high-stress use where very high tensile strength or hardness is required. In such circumstances, alloy or high-carbon steels are used.
Q5. What happens to mild steel when it is welded?
Mild steel has a low percentage of carbon and hence it is easy to weld. Welding does not have a major impact on mild steel. If any changes in the properties of the material are only slightly affected.
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