Due to the continuous development of urbanization construction, materials in the building materials market have emerged one after another. Although these materials are relatively common in our daily life, people who do not usually run in the building materials market may not know carbon steel. material, we will not understand its advantages and disadvantages, and even we will ignore its existence. Next, today I will explain to you what kind of material carbon steel is? And what are its advantages and disadvantages?
What material is carbon steel?
Carbon steel mainly refers to the steel whose mechanical properties depend on the carbon content in the steel, and generally does not add a large amount of alloying elements, and is sometimes called plain carbon steel or carbon steel. Carbon steel, also called carbon steel, refers to an iron-carbon alloy with a carbon content of less than 2% WC. In addition to carbon, carbon steel generally contains a small amount of silicon, manganese, sulfur, and phosphorus. Generally, the higher the carbon content of carbon steel, the greater the hardness and the higher the strength, but the lower the plasticity.
Advantage
1. Carbon steel can get higher hardness and better wear resistance after heat treatment.
2. The hardness of carbon steel in the annealed state is very moderate, and it also has good machinability.
3. The raw materials of carbon steel are very common, easy to obtain, and the production cost is relatively low.
Disadvantage
(1) Poor hardenability
After water quenching selection of carbon steel, quenched into the critical diameter of 15 ~ 20mm, 20mm diameter greater than the parts, even if the water can not quench hardenability can not be guaranteed to get the entire cross-section consistent mechanical properties. Therefore, large parts require high, carbon steel is certainly not applicable. The alloy has high hardenability can be used to manufacture large cross-section shape complex parts.
(2) High-temperature strength, low carbon steel, red hardness difference
When the carbon steel at temperatures above 200 ℃, its strength and hardness will soon be reduced. The good stability after tempering alloy. Red hardness, and can operate at higher temperatures.
(3) Weak comprehensive performance
For example, when using quenched to try to get a good overall performance, to ensure high strength, toughness is low, to ensure better toughness, the intensity and low. This is due to the poor stability of carbon steel tempered reason. Therefore, the resulting carbon steel alloy poor overall performance much higher than that alloy has good robustness.
(4) Without good specific performance
For example, requires high temperature hardness or tonicity, antioxidant, corrosion resistance, special electrical, magnetic, etc., can not be obtained with carbon steel, alloy steel chosen to meet only the above requirements.
What are the classifications of carbon steel?
1. According to the use, carbon steel can be divided into three categories: carbon structural steel, carbon tool steel and easy-to-cut structural steel.
2. According to the smelting method, carbon steel can be divided into three categories: open hearth steel, converter steel and electric furnace steel.
3. According to the deoxidation method, carbon steel can be divided into boiling steel, killed steel, semi-killed steel and special killed steel, which are represented by codes F, Z, b and TZ respectively.
4. According to the carbon content, carbon steel can be divided into three categories: low carbon steel, medium carbon steel and high carbon steel.
5. According to the content of sulfur and phosphorus, carbon steel can be divided into ordinary carbon steel (the amount of phosphorus and sulfur will be higher), high-quality carbon steel (the amount of phosphorus and sulfur will be lower), high-grade high-quality steel (which contains lower phosphorus and sulfur content), and special-grade high-quality steel.