What is high-quality carbon steel and how to express carbon steel?
High quality carbon structural steel
The two digits at the beginning of the steel number indicate the carbon content of the steel, expressed as a few ten thousandths of the average carbon content. For example, a steel with an average carbon content of 0.45% has a steel number of "45". It is not a sequential number, so it cannot be read as 45 No. steel.High-quality carbon structural steel with a higher content should have the manganese element marked, such as 50Mn.
Boiled steel, semi-killed steel and special-purpose high-quality carbon structural steel should be specially marked at the end of the steel number. For example, semi-killed steel with an average carbon content of 0.1% has a steel number of 10b.
Carbon tool steel
The steel number is marked with "T" to avoid confusion with other steel types.
The number in the steel grade indicates the carbon content, expressed in thousandths of the average carbon content. For example, "T8" means an average carbon content of 0.8%.
Those with higher manganese content will have "Mn" marked at the end of the steel number, such as "T8Mn".
The phosphorus and sulfur content of high-grade high-quality carbon tool steel is lower than that of ordinary high-quality carbon tool steel. The letter "A" is added at the end of the steel number to indicate the difference, such as "T8MnA".
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