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The role of carbon steel


What is carbon steel profile?

Steel is already everywhere in our lives, and can even be said to be an essential "necessity of life".

The pillars of our steel re-bar are necessary for the establishment of the high-rise buildings in the city center; it also occupies an indispensable position in the buildings where we live at home; the cars flying on the road also have the formation of our stainless steel, and so on. Steel is already something that lives and breathes with us.

But now there is carbon steel, so you have doubts, so what is carbon steel?

Carbon steel is a derivative of steel, which is commonly known as steel containing the element carbon, but the content of the element carbon also determines whether it is called carbon steel.

Widely speaking, carbon steel is an iron-carbon alloy with carbon content ranging from 0.0218% to 2.11%, and we also call it carbon steel. Normally, carbon steel also contains small amounts of silicon, manganese, sulfur, and phosphorus.

So why single out the carbon in carbon steel? The main reason is that in carbon steel, the carbon content is related to the hardness of the steel, the higher the carbon content, the harder the carbon steel, the higher the strength, and the relative plasticity will be lower.

Carbon steel classification

  classificationFirst-class classificationSecondary Classification



Free-cutting structural steel

Carbon structural steel

Engineering construction steel, machine building structural steel

Carbon tool structural steel

Smelting method


Smelting method

Flat Furnace Steel

Converter steel

 Carbon content

Low carbon steel(WC ≤ 0.25%)

Medium carbon steel(WC0.25%—0.6%)

High carbon steel(WC>0.6%)

Products of carbon steel

1. Low carbon steel

We usually call carbon steel with a carbon content between 0.1% and 0.3% low carbon steel or soft steel. Low-carbon steel in this carbon content range is easier to process in various ways, such as cutting and welding, because of its low carbon content. Rivets and bolts, like the more common ones, are made of mild steel. It can also be rolled into steel pipes, steel strips, I-beams, etc., which are used in various building constructions, boxes, agricultural machinery, etc. Some high-quality mild steel is also rolled into thin plates to make deep-drawn products such as automobile cabs.

2. Medium Carbon Steel

The carbon content of medium carbon steel ranges from about 0.25% to 0.6%, in addition to a small amount of manganese, which is about 0.7%-1.2%. This stage of medium carbon steel has the characteristics of good hot working and cutting performance, but poor welding performance. Because the carbon content is higher than that of low-carbon steel, it has higher strength and hardness than low-carbon steel, but its relative plasticity and toughness are lower than that of low-carbon steel.

It is mainly used in higher-strength moving parts, such as impellers of steam turbines, gears of heavy machinery, air compressors, etc. And some surface wear-resistant parts, such as spindles of machine tools, clamping tools, etc.

3. High-carbon steel

Usually, the carbon content is 0.6%-1.3%, all are called high-carbon steel or tool steel. Tools like crowbars and hammers are made of carbon steel with 0.75% carbon content if the carbon content is 0.9%-1%, they can be used to make cutting tools like reamers and drills.

4.Examples of carbon steel products

Therefore, in the medium strength level of various applications, the most widely used is medium carbon steel. It is not only used in construction materials but also the manufacture of mechanical parts.For example, in our factory, it is widely used in cold and hot rolled series —— Aisi Astm hot rolled mild steel coils, ASTM cold rolled carbon steel sheets, etc.

ASTM Cold Rolled Carbon Steel Sheet.jpg

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