Carbon steel is a specific category of steel characterized by a higher carbon concentration than other common steel types. While most conventional steels contain approximately 0.05% to 0.3% carbon, carbon steel typically has a carbon content ranging up to 2.5% – a difference that, though seemingly small, imparts several distinctive and highly beneficial properties not found in low‑carbon alternatives.
This elevated carbon level significantly enhances hardness, strength, and wear resistance, while also improving machinability and enabling various heat‑treatment responses. These advantages make carbon steel an indispensable material as Versatile Material with High Carbon Content for Industrial Applications across a wide range of industries – from construction and automotive components to cutting tools, machinery parts, and structural applications.
Advantages of Carbon Steel
Versatility
Carbon steel can be alloyed with other materials to enhance specific properties, making it a versatile choice for different applications.
Durability
The biggest benefit of carbon steel is its durability. It is strong and shock resistant, which is why it makes such a beneficial material for construction projects. Business places, government buildings, and residences constructed with steel materials are more resistant to natural disasters such as earthquakes and tornadoes.
Affordability
It’s far cheaper to manufacture certain products out of carbon steel than other metals, as a little can go a long way. Its durability means less metal can be used while still performing the same function as materials that may be made of another metal like copper.
Safety
Steel is relatively easy and safe to handle. It’s also commonly used in cookware because it does not shed potentially harmful chemicals into food.
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Low carbon
Also known as “mild steel,” low carbon steel is the cheapest option in terms of value, but it’s also easy to bend and shape, which makes it perfect for a multitude of uses (including sheets, screws, and concrete reinforcement bars). It can be frequently found in the kitchen in the form of cookware or eating utensils (stainless steel is low carbon), but this steel type’s low carbon content means it’s unsuited to being case hardened (but it can stand up to the dishwasher without rust forming).
Medium carbon
Medium carbon has a slightly higher base carbon component than low carbon (0.31% to 0.60%, as opposed to low carbon’s 0.04% to 0.30%) and a bit more natural manganese as well. Because of this, medium carbon may be stronger than low carbon, but it’s also more difficult to shape. It’s still got many uses, however — thanks to its strength and wear resistance, it’s perfect for various machine or car parts.
High carbon
Also known as “carbon tool steel,” the strongest carbon steel you can buy is also, as expected, the most inflexible. High carbon steel has more carbon than the other two types (between 0.60% and 1.4%), yet it too can accept alloys in order to change its properties. Chromium and manganese alloys can be added to high carbon steel while it’s being formed to help the material avoid corrosion. It’s also an ideal type of steel to subject to heat treatments in order to increase its hardness.
Properties Of Carbon Steel
Material properties are intensive properties, that means they are independent of the amount of mass and may vary from place to place within the system at any moment. The basis of materials science involves studying the structure of materials, and relating them to their properties (mechanical, electrical etc.). Once a materials scientist knows about this structure-property correlation, they can then go on to study the relative performance of a material in a given application. The major determinants of the structure of a material and thus of its properties are its constituent chemical elements and the way in which it has been processed into its final form.
Mechanical properties of carbon steel
Materials are frequently chosen for various applications because they have desirable combinations of mechanical characteristics. For structural applications, material properties are crucial and engineers must take them into account.
Strength of carbon steel
In mechanics of materials, the strength of a material is its ability to withstand an applied load without failure or plastic deformation. Strength of materials basically considers the relationship between the external loads applied to a material and the resulting deformation or change in material dimensions. Strength of a material is its ability to withstand this applied load without failure or plastic deformation.
Components of Carbon Steel
Carbon steel can be divided into low carbon steel, medium carbon steel and high carbon steel according to its chemical composition
Low carbon steel
Also known as mild steel, low carbon steel with carbon content ranging from 0.10% to 0.25% makes it easily to be used in various processing such as forging, welding and cutting. It is often used to make chains, rivets, bolts, shafts, and etc.
Medium carbon steel
Carbon steel with a carbon content of 0.25% to 0.60%. There are a variety of products such as killed steel, semi-killed steel, and boiling steel. In addition to carbon, it can also contain a small amount of manganese (0.70% to 1.20%). According to product quality, it is divided into ordinary carbon structural steel and high-quality carbon structural steel. Medium carbon steel possesses good thermal processing characteristics and cutting performance, but its welding performance is poor. Its strength and hardness are higher than low-carbon steel, while plasticity and toughness are lower. Hot-rolled and cold-drawn materials can be used directly without heat treatment, or be used after heat treatment. The quenched and tempered medium carbon steel has good comprehensive mechanical properties. The highest hardness that can be achieved is about hrc55 (hb538), and σb is 600-1100mpa.
High carbon steel
Often called as tool steel, the carbon content ranges from 0.60% to 1.70%, which can be hardened and tempered. Hammers and crowbars are made of steel with a carbon content of 0.75%. Cutting tools such as drills, taps, and reamers are made of steel with a carbon content of 0.90% to 1.00%.
Carbon steel can be divided into ordinary one and high-class one according to its quality
Ordinary carbon steel
Ordinary carbon structural steel, also known as ordinary carbon steel, has wider restrictions on carbon content, performance range, and contents of phosphorus, sulfur, and other residual elements. In china and some countries, it is divided into three categories, class a, b, c, according to the guarantee conditions of delivery. Class a steel is steel with guaranteed mechanical properties. Class b steel is a steel with guaranteed chemical composition. Special steel is a steel that guarantees both mechanical properties and chemical composition, and it is often used to manufacture important structural parts.
High-class carbon steel
Compared with ordinary carbon structural steel, high-class carbon structural steel has a lower content of sulfur, phosphorus and other non-metallic inclusions. According to different carbon content and uses, this type of steel is roughly divided into low, medium and high carbon steel.
Application of Carbon Steel
Architecture and construction
In construction and architecture, carbon steel is used regularly. This is mainly because it can be easily shaped, while withstanding great weights and loads, making it perfect for high-rise buildings, bridges, and large structures, among other things.
Transportation
Carbon steel is also used in the manufacture and construction of different vehicles: Engine parts, bodies or axles, among many other things. Since vehicles are exposed to high loads and vibration throughout their lives, materials such as carbon steel need to be used to allow them to withstand these without damage.
Railway sector
In the railway world, carbon steel is also widely used. Not only for rails and crossties, but also for locomotives and cars. As with autos and trucks, trains and their components are also exposed to pressure and vibrations, which makes this material perfect.
Aerospace sector
Carbon steel is also used in aerospace. It can be found in airplanes, rockets and even in satellites and exploration robots, because it is highly resistant to corrosion and is durable over long periods of time.
Shipbuilding industry
In shipbuilding, carbon steel is mainly used for its high tensile strength and its resistance to abrasion and corrosion by salt water. These properties make it ideal in the construction of ships and maritime equipment.
Mining industry
In mining, carbon steel can be found in structures, tools, transport cages, and in machinery for the extraction and processing of minerals. Crushers, mills and drills are also made of carbon steel due to the metal’s ability to withstand extreme loads and high temperatures.
Four Common Carbon Steel Products
Shipbuilding
Flat-rolled sheets of low-carbon steel and high formability mild carbon steels are applied in the manufacture of numerous lightweight, high-hardness structures. Deck facilities on ships of various sizes regularly use carbon steel to complement the heavier, corrosion resistant hull plating that usually has a higher manganese content.
Structural steels
Steels with intermediate to elevated carbon contents and high levels of additional alloying elements show exceptional degrees of formability and structural integrity, allowing them to be formed into numerous steel profiles and sections. These can be treated and tested to numerous specifications for exacting construction demand and are typically discovered in various engineering applications globally.
Pipes and pressure vessels
The gas and petrochemical sector are among the biggest users of raw carbon steel products, making millions of miles of carbon steel pipework and pressure vessels for non-vital uses. Low-carbon steel is an appealing possibility for those kinds of uses because of its good weldability for formation into complex, rounded shapes, and its capacity for case hardening.
Petrochemical wells
Hic (hydrogen induced cracking) resistant steel is an ultra-low carbon steel that is widely used for sour service in the oil and gas sector. Steel parts that are in near-endless contact with hydrogen sulfide might eventually show hydrogen embrittlement and related cracking over time. This is an expensive, time-consuming, and possibly hazardous symptom of sour service, which can be circumvented by the use of hic resistant carbon steel.
Making of Carbon Steel
Raw materials
The primary raw materials used in the production of carbon steel are iron ore, coal, and limestone. Iron ore is mined and then processed into iron, which is then melted in a blast furnace along with coke (a type of coal) and limestone. The coke acts as a reducing agent, reacting with the iron ore to remove oxygen and other impurities.
Steel making
Once the iron has been melted, it is then converted into steel through a process called steelmaking. There are two main methods of steelmaking: The basic oxygen process (bop) and the electric arc furnace (eaf) process.
Basic oxygen process
In the bop process, oxygen is blown into the molten iron to remove impurities such as carbon, silicon, and manganese. The resulting steel is then poured into molds and cooled, forming a solid steel billet.
Electric arc furnace process
In the eaf process, scrap steel is melted in an electric arc furnace using electricity generated from natural gas or coal. The resulting molten steel is then poured into molds and cooled, forming a solid steel billet.
Rolling
Once the steel billet has cooled, it is then shaped into various forms such as plates, sheets, or bars through a process called rolling. The billet is passed through a series of rollers that gradually reduce its thickness and shape it into the desired form.
Annealing
After rolling, the steel may be subjected to a process called annealing, which involves heating the steel to a high temperature and then slowly cooling it to relieve internal stresses and improve its ductility and toughness.
Finishing
The finishing stage of carbon steel making involves several processes that refine the chemical composition and physical properties of the steel to meet specific requirements. The finishing stage of carbon steel making is crucial in ensuring the quality and consistency of the final product. The production involves finishing the steel to the desired surface finish, such as polishing, painting, or coating.
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FAQ
Q: What is the difference between steel and carbon steel?
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