钢铁是一种由铁与其他元素结合而成的合金，当中最普遍的是碳。碳约占钢材重量的0.2%至2.1%，视乎钢材的等级。其他有时会用到的合金元素还包括锰、铬、钒和钨。
Iron and steel is an alloy made of iron and other elements, the most common of which is carbon. Carbon accounts for about 0.2% to 2.1% of the weight of the steel, depending on the grade of the steel. Other alloying elements that are sometimes used include manganese, chromium, vanadium and tungsten.
碳与其他元素有硬化剂的作用，济钢一级代理能够防止铁原子的晶格因原子滑移过其他原子而出现位错。调整合金元素的量，及其存在与钢中的形式，就能够控制钢成品的特性，例如硬度、延展性及强度。加了碳的钢会比纯铁更硬更强，但是这种钢的延展性会比铁差。

Carbon and other elements have the effect of hardening agent, and the first agent can prevent the atomic lattice of iron atoms from slipping through other atoms. By adjusting the amount of alloying elements, their presence and the form of steel, they can control the properties of steel products, such as hardness, ductility, and strength. Carbon steel will be harder and stronger than pure iron, but this steel will be more ductile than iron.
铁碳合金分为钢与生铁两大类，钢是含碳量为0.03%～2%的铁碳合金。碳钢是最常用的普通钢，冶炼方便、加工容易、价格低廉，而且在多数情况下能满足使用要求，所以应用十分普遍。按含碳量不同，碳钢又分为低碳钢、中碳钢和高碳钢。随含碳量升高，碳钢的硬度增加、韧性下降。合金钢又叫特种钢，在碳钢的基础上加入一种或多种合金元素，使钢的组织结构和性能发生变化，从而具有一些特殊性能，如高硬度、高耐磨性、高韧性、耐腐蚀性，等等。
Iron carbon alloy is divided into two categories of steel and pig iron, steel is a carbon content of 0.03% to 2% of the iron carbon alloy. Carbon steel is the most commonly used ordinary steel, smelting convenience, easy processing, low price, and in most cases can meet the use requirements, so the application is very common. According to the carbon content, carbon steel is divided into low carbon steel, medium carbon steel and high carbon steel. With the increase of carbon content, the hardness and toughness of carbon steel decrease. Alloy steel and special steel, adding one or more alloying elements in steel on the basis of the change of microstructure and properties of steel, it has some special properties, such as high hardness, high wear resistance, high toughness, corrosion resistance, etc..
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